Truck runs better with coolant temp sensor unplugged. Of course now there are more modern ways of testing a sensor such as with a multimeter or scan tool. The temperature of the coolant in an internal combustion engine is measured by a coolant temperature sensor (CTS). Check engine light is on (constant) and temp gauge still not reading. Unplugging the Jun 20, 2016 · I have a 1988 Chevy k1500 with a 5. Jan 19, 2019 · I'm out checking the live data right now. The check engine light does not come on until I disconnect the MAP sensor. Jumpered the ALDL, got a code 33. 7 350, upon first start up you have to have the temp sensor plugged in otherwise it will spit and sputter, and run like crap. I left work at lunch and halfway to the auto parts store the guage started working and the code went away. All trucks the same on this one. ) Map Sensor 10. and it runs rough. The coolant sensor does not determine that time. Plugged it in and starts right up. Low coolant temperature produces high resistance; high coolant temperature produces low resistance. i hit the accelerator hard and the car doesnt respond, the revs go high, but no actual response on the road Feb 5, 2024 · 1994. The truck runs extremely rich to the points its puffing black smoke out of the exhaust. Checked a bunch of stuff with no luck. Im wandering if this is causing my loss of power because the truck still thinks its Nov 10, 2017 · Hi, the radiator fan does not come on when the heat gauge reaches half way the water starts boiling but the temperature gauge stays in the middle. and now that the pressure reg. I have never hit even close to 30 pounds and im running custom innovative tunes. The outside temp is around 25 degrees. Same problem, sputters, spits, coughs. Dodge used a plastic sensor, a disappointment and bad choice of materials. If I have the coolant sensor plugged in it idles at 11-1300 rpm, if i unplug the coolant sensor (the one in the head next to the goose neck) it will run at perfect rpm and purr. May 19, 2012 · The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board: tbi runs better with temp sensor unpluggedneed advice Aug 11, 2020 · Your vehicle’s engine coolant temperature sensor (ECT), also known as coolant temperature sensor (CTS), is a small but essential piece of kit. Sensor that sends engine temp to the PCM (EOT) is part number 3F1Z-12A648-A aka DY-1144. The truck was running just fine. It is located close to the thermostat housing. If the engine coolant temperature sensor fails, it can cause a variety of problems. i got flat spots inbetween auto gear changes. I have replaced - 1988-1998 Chevrolet Pickup Nov 24, 2023 · I have a 72 F250 with the I6 300. May 30, 2002 · 1987 - 1996 F150 & Larger F-Series Trucks - Unpluged EGR Sensor - After trying EVERYTHING, I could not solve performance problem w/ '88 F-250, 351C. To eliminate the coolant sensor as the culprit , If I was in the OP shoes, I would: warmed up the engine until close to middle of coolant gauge. Oct 19, 2013 · 6. Here’s the story to it, it was my pawpaws, one of his workers wrecked it, and we just got it running a couple months ago. The information it supplies, however, is critical to how your vehicle runs. The truck instantly idled to 800rpm and purred while Jun 5, 2023 · I have tried 3 times to troubleshoot my cooling fans, i just dont know what to do. I have a sensor for the temp gauge on the passenger side of the motor below the manfold on the side of motor. Jun 3, 2024 · Test your throttle position sensor. I was told to drive it for 50-100 miles and the system would automatically reset . and I'm not really certain how to go about fixing it. The sensor itself isn’t very impressive. Oct 4, 2024 · An unplugged IAT sensor can disrupt these calculations, as the ECU would then be missing crucial data needed to adjust the mixture correctly. it barely lifts past the c . Map sensor has 3 wires one is 5v on run one is ground and one is the sensor wire which runs back to the ecu. I’ve never owned a dodge truck, never really liked them. 7 V, cold 105 ohms hot 3. 7L TBI motor. Jan 13, 2017 · Plugged in, the sensor is sending a signal for an extremely cold setting, with a very rich mixture as the result. The severity of the P0118 code can vary depending on the symptoms experienced. Jul 31, 2008 · Ok I will see what I can find out at autozone tonight with the coolant sensor. 00 dollars and towed it home. Does any body have any ideals. The previous owner replaced just about every sensor and the fuel injectors trying to correct the issue. Jan 28, 2011 · If you still have the temp sensor code, I would unplug the battery again, and then go under the dash and take the connector off the computer and look it over, and then plug it back in, then unplug it and plug it back in several times, and then see what happens. I just bought a set of mechanical gauges due to my oil pressure dash was acting funny and i ended up getting the combo with oil pressure, coolant temp sensor, volt meter. The injectors are Jun 17, 2018 · I had the AC on in the truck today and noticed the air would get warm at idle. Diagnostic code P0128. Aug 12, 2016 · Note: The process of removing the coolant temperature sensor is very consistent, regardless of the type of vehicle you own. I pulled a code that shows the egr was working incorrectly. I cant find the Sep 26, 2016 · "Sensor that sends coolant temp to the dash (ECT) is part number F65Z-10884-AA aka SW-5130 aka 36447 when found at Advance, Amazon etc. May 19, 2012 · The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board: tbi runs better with temp sensor unpluggedneed advice Jun 1, 2008 · If the coolant temp regulated the O2, why even make heated O2 sensors? The whole point of a heated O2 is to speed up the time the O2 can get into closed loop. However this thing is tough as nails, I’m impressed. Without accurate temperature data, the ECU may either enrich or lean the fuel mixture erroneously, causing various performance issues such as reduced fuel economy, rough idle, and even potential damage to the engine itself. Oct 30, 2014 · The Engine Coolant Temperature (ECT) sensor is mounted in the engine coolant stream (figure 5-23). The car would not start well cold without running the glow plugs a lot, sensor unplugged. Dec 14, 2008 · 1999 - 2003 7. It is usually a two-wire sensor that is either threaded into the engine block or mounted in a coolant passage. This means that there is an issue with the engine coolant temperature sensor, the wiring or connectors associated with it, or the engine control module (PCM). The AC was nice and cold if I was driving. The engine will run better without it but will produce more smog. Nov 4, 2023 · After replacing the temp sensor the dash gauge started working properly, but shows it overheating. changed coolant temp sensor twice. and yes, i have a band new sensor. Jan 2, 2004 · It idled nice and strong. 7 v8. Made from brass to prevent corrosion, it can fit easily in the palm of your hand. I can hit over 30 pounds of boost and it seems like the truck drives a little better. 2012 Ram 1500 Big Horn with 5. The PCM uses coolant temperature as an indicator of engine operating temperature. 4L engine, to repair the trouble codes P0117 (Engine Coolant Temperature Sensor Circuit Low) or P0118 (Engine Coolant Temperature Sensor Circuit High), the brake booster vacuum hose that was routed too close to the ECT sensor connector must be replaced. The ECM or PCM uses this… Nov 8, 2009 · 8. Before starting the engine, unplugging the engine coolant temperature sensor may cause it not to start, which is more likely on a cold morning. Changed the sensor out, added coolant. Boost Goes From 0-10-15 ,WhenU Nov 10, 2013 · I have seen injection timing cause similar issues to this. May 20, 2010 · Timing set to 0 degrees with tan wire unplugged per the book New Coolant Temperature Sensor Truck runs fine when cold, problem becomes noticeable as engine Dec 15, 2007 · jakry001 wrote:with it on, my car runs like crap. Before I went on a parts cannon approach, I checked the MAP sensor - it was plugged in but the vacuum line was somehow disconnected. Here is what I did. It should have 1 or 2 ohms resitance at the most when checked . 7L Power Stroke Diesel - 2012 cel coolant temp sensor? - I Have A 2013 F250 I Have A H&S On It. I bought one and got home. Put it in time and it fired flawlessly. Given the ambient temp here today that's pretty much spot-on. Use the voltage and corresponding coolant temperature chart listed below. Upon removing the sensor it broke off. Need the new hardline there. 3L Power Stroke Diesel - Coolant sensor unpluggedstill reads way high - Ok, i replaced my coolant temp sensor ontop of my waterpump due to getting a high reading in AE. I Have It Delete. However, since all vehicles are unique, it's important to verify specific instructions with your vehicle’s manufacturer’s service manual before proceeding. The o2 sensor only has approx 2000-2500 miles on it and my engine has had "something" that didn't seem quite right since the rebuild. However, my girls and GF love riding through the woods in it. EGR as @manbearpig stated and given the age of the truck it could have a vacuum leak in the power brake booster. 3. The computer will go to a preset value for the coolant, but still close the loop for the O2. No missing through out the rpm range. Mar 17, 2013 · I just went out and Messed with the truck a bit. The Jul 13, 2007 · Reading the bentley i think the reason the coolant temp sensor was making it run better is because it has input into the pressure reg. Truck isn’t running rich, CEL is off but the idle is rough. Jan 26, 2024 · The P0118 code refers to the engine coolant temperature sensor circuit registering a high input voltage. Any help will be appreciated. been a few weeks and its again reading around 309F+. after sitting five years i bought it for 380. The tip of the sensor is submerged in coolant. coolant levels are good. Check it from the connecotr black wire to a good known ground Check the yellow wire at the coolant temp sensor. So it should have been an easy fix. I keep it alive, it has 267,000 miles on it. The sensor is a thermistor that changes value based on temperature. Feb 24, 2010 · I also got a dashboard message saying "Engine Hot A\C shutting down. Reconnected the line. 3L Power Stroke Diesel - Truck runs better with map sensor unplugged - I have a 1997 7. Dec 6, 2013 · I would not run it with the coolant temperature sensor unplugged, as your truck will run very rich I believe, and you are at risk of fouling valves, the cat, etc. Dec 20, 2019 · If that checks out , then its time to check the coolant temp wiring to the Computer (ECM) Check the blackwire (with sensor unplugged) . They changed design of the lower crank sprocket on the early models like yours because the sprocket key would wear and allow movement. If it switches from -30c (or anything likely incorrect) to the actual coolant or air (if engine cold) temp, you've found the problem. fuses seem good. 9L / 300 - engine runs better with egr vac line removed and sensor unplugged - I have a 91 f150 2wd. 0. If the vehicle runs better without the sensor unplugged it most likely means that the sensor is faulty. More than one coolant temperature sensor may be used on some systems to determine the temperature in different locations. Coolant Temperature °C (°F) ECT (Volts) 22 (71) 3. Anyways, my problem is that it has no Dec 29, 2020 · Broken off Coolant Temp Sensor. nothing seems to help. Disconnecting the sensor may be getting you a default setting, and fuel mixture, that is much better for the engine’s performance. Exhaust gas heats the O2, not coolant. The sensor typically sits inside the engine block or cylinder head, and it communicates the coolant temperature to the powertrain control module (PCM) or engine control module (ECM) via a signal. And with the coolant temp sensor unplugged and the engine all the way cold from sitting over night it won't start. But It Has Something To Do With Coolant Temp Sensor. Nov 29, 2011 · So i took the tube off of the sensor and cleaned it last night. So I put on a brand new MAP sensor. When it's stone cold, it will idle fine for about 15 minutes till it warms up and then stalls. 00 43 (109) 2. Narrowed down the cause to the Coolant Temp Sensor. I cannot find the sensor on the truck. 3 is the ecm coolant temp sensor. A previous owner replaced the carb with a Fittech 400 EFI and ran a new 2-wire sensor from the original coolant temp location (passenger side, back, near the manifold) into the Fittech. Feb 19, 2015 · MIESK5 NOTE; If da Engine Coolant Temperature Sensor (ECT) is Below 50 degrees F, then TAB is grounded & sends air to atmosphere; If Between 50 and 190 Degrees F, Bypass Valve sends air to Diverter and to Manifold; If Over 190 Degrees F, it is in closed loop & Air goes to Catalytic Converter; Bypass when at idle/Wide Open Throttle (WOT Jul 5, 2006 · well first of all what year and what motor? I have a 1991 ford f-150 with the inline six. 1 ohms please tell me if these are within spec. is disconnected it is in full on limp-mode making the car have a more consistant fuel pressure than before allowing the motor to run smoother. Runs great but the temp gauge in the cab doesn't work because it's got no input anymore. Nov 11, 2005 · So my car will run for about 10 seconds perfectly, then begin to run like crap and then die, but if I unplug the coolant temp sensor on the water outlet on the front of the head, it runs great, so is this just a bad CT sensor? Sep 14, 2024 · 1978 - 1996 Big Bronco - 1986 Bronco runs very rich - I picked up an 86 bronco with the fuel injected 5. After ten minutes or so, you have to unplug the temp sensor, otherwise it will run like crap spitting and sputtering. Someone knew it would break. Over a long period of time the higher combustion temperature can cause valve damage. I recently ran into a no start condition, but had spark and fuel. Sep 22, 2017 · Hello i have a 93 k1500 5. I unplugged the engine coolant temp sensor and the fans still did not come on. With it plugged in my coolant temp sensor is reading 18 degrees and my intake air temp is reading 32. fan motors run, checked wiring all the way as to even removing fuse box to look for anything wrong and found nothing. Jul 26, 2014 · Ford Inline Six, 200, 250, 4. i went ahead and replaced the position sensor, no CEL now, but still hesitant when accelerating. ) Coolant Temp Sensor 12. I think they're supposed to be on when the AC's running. Found that when I unplugged the coolant temp sensor (on T-stat housing) that the engine (1995 YJ 2. Oct 15, 2018 · I disconnected the air Temp sensor and the truck stays on now, but dies when i accelerate (might be a different issue). As part of troubleshooting, I unplugged the temp sensor while it was running which made the radiator fans come on. Pin 37 reads 12v (KOEO) and pin 21 is dead with IAC and ECM unplugged. The new sensor is brass. Jun 29, 2018 · Typically, the coolant temperature sensor is mounted in the engine block or cylinder head, near the thermostat or where the coolant flow is hottest. and on the top of the motor where the thermostat housing is there is another sensor for the water temperature that i do belive is for the motor. 5 to . Mounts on top of water pump. I left the sensor unplugged and drove it a little bit . The fan still inst working, however if I unplug the temperature sensor the fan works from start up. It Also Does Like A Bucking/Power Surge. Today while under the hood of my 2. You can check by plugging in obd reader and having someone jiggle sensor plug wiring while you monitor coolant temp on the reader. It has a intercooler and turbo from a super duty. The truck has new wires, cap/rotor, plugs. Oct 16, 2021 · Of course the engine will run better if already warmed up BEFORE you unplug this sensor - a cold start would be difficult as the mixture would not be appropriate if this sensor is unplugged. So far I have Adjusted the TPS, replaced the water temp sensor, cleaned the primary o2 sensors, tested the AFM, replaced the caps in the ECU. So can i leave it unplugged or is it going to screw it up? Aug 12, 2009 · Just thought I'd share this. Oct 12, 2008 · Record the ECT voltage every 60 seconds. I backprobed the ground and the sensor wire while my engine was running and got 4. I am thinking that the Coolant Temperature Sensor must be bad or going bad. Ive even Nov 12, 2023 · Temperature gauge quit working and fans running after shut off. Dec 12, 2012 · 1987 - 1996 F150 & Larger F-Series Trucks - 1989 F250 ECT sensor location/description? - I'm sorting through some issues and found an old post on this site referring to how a bad ECT sensor (Engine Coolant Temperature) could cause an engine to flood when warm because the PCM will think it's a cold engine. ) All vacuum lines 11. 03 volt or less) from the previous reading, record this as the thermostat opening voltage. 5v at idle. On second thought there is no PCV on that line it is just a hose from the valve cover to the factory air cleaner that is cracked. If I disconnect the MAP sensor it idles and runs smooth. 01 Oct 23, 2007 · With the MAP sensor unplugged, I get SES code 34 (bad MAP sensor of course). It should have . Aside from it running rich. Part 2 of 3: Replace the Coolant Temperature Sensor. 55 volts key on not running. Apr 6, 2010 · The EGR system meters a little exhaust gas into the intake which lowers the combustion temperature which lessens the amount of NOx in the exhaust. Jul 5, 2013 · P0118 code. After I replaced it, it was reading normal after I replaced it. It is a woods truck, mud truck ,and has survived 3 years of abuse. Dec 2, 2013 · I need some fresh ideas, my main salt truck is a 91 Chevy 3500 1 ton 2wd with a 5. Might need to hit the gas during cold starts if you go this route. When the ECT voltage trend changes direction or only changes slightly (0. 5L) ran fine. Mar 7, 2011 · 1987 - 1996 F150 & Larger F-Series Trucks - Coolant temp sensor symptoms - Lately ive noticed that my truck warms up fine, gets amazing heat from vents but the gauge doesnt even go past the first mark. I unplugged EGR sensor and my truck runs much, much better, although running rich for obvious reasons. I have already replaced the MAP sensor but there was no change. 9 b2 I was curious and decided to unplug the coolant temp sensor. 7 Hemi. 14 ohms pcm temp sensor= wire koeo 4. ) Intake Manifold Gasket It throws no diagnostic codes other than 12, runs great down the highway, never fails to start on the coldest of days. 1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks - Truck only runs with coolant sensor unplugged? - ok so heres what im dealing with my 86 f150 lariat 302 has been nothing but trouble since the day i bought it. 9V, cold 21 ohms, hot . my only question is how do i go about running the coolant temp sensor as if i take the electric one out then it will not run correctly as there will be no data sent to the computer. relays seem good i even switched them out from another area that i know work. Sep 25, 2018 · BUT!!! I think I may have found an issue with the map sensor. I then unplug the MAP and it runs okay again (until finally it dies after a few minutes) Here’s a list of what I’ve checked and replaced: Checked for vacuum leaks-none found Removed Cat. Feb 23, 2017 · Hello. Unplugging a sensor to see if it will make any difference is an old-fashioned way to test a sensor on an engine. Thank You Michael [email protected] Feb 28, 2010 · 1983 - 2012 Ranger & B-Series - results of coolant temps sensor test( please analyze) - tested my temp sensors pleas analyze my results gauge temp sensor= wire koeo 8. And The Cel Comes On In The Morning, Ill Get The Code In The Morning. 5 - 1997 7. I've replaced the thermostat and hoses as well as the top row relays in the engine fuse box. I was told that it was a faulty temperature sensor which I replaced. . The other thing pretty common on the TBI 4. Nov 5, 2022 · The coolant temp and intake air temp sensors were both reading around 40-45k ohms at the ECM plug (read between the 5v ref pin and their respective signal pins). I assumed a blend door was bad, but noticed the electric cooling fans were not coming on. ) Throttle Position Sensor 9. The amount of voltage It will start but not idle. i dont know if this can help you. Jul 18, 2021 · For example, as per the service bulletin 05-002-12 for the 2011 Dodge Journey with the 2. Nov 17, 2022 · What Happens If You Unplug The Coolant Temp Sensor. It should have 5 volts on it with it May 16, 2011 · 1987 - 1996 F150 & Larger F-Series Trucks - runs better with o2 sensor off? - 1994 f150 300/6 5 speed for the last couple months to a year my truck has been slightly sluggish at random times and sometimes would miss horribly on cold start or warm start but then go back to normal, but ive just driven it and not worried When I unplug the AFM the truck has amazing power from way down low all the way to redline, it feels much smoother and seems to run better. If you cannot completely diagnose, I suggest unplugging the IAC valve, and setting it at a warm idle you are happy with. Jan 19, 2014 · Today I was trying different things and I unplugged the o2 sensor and it runs great. . Took it to have codes cleared but there were no codes. Feb 20, 2024 · The engine coolant temperature sensor is typically located near the thermostat housing or on the cylinder head. When the engine coolant sensor is unplugged while the car is moving, it’s likely that the engine will stumble and sound harsh. I decided to throw parts at it, coolant Temp sensor, air Temp sensor, and tps and its exactly the same. Jul 30, 2012 · The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board: Engine runs better with MAP sensor unplugged? Mar 4, 2022 · My truck is a ****, the winch cost more than the truck. It definetly runs better at operating temp than cold, but it runs better either way with the MAP disconnected. No other malfunctions that I can see. With the map sensor plugged in I tried line locking it and let the turbo spool up it wont go over 2000rpm with it unplugged it will reach about 3200 this was warm but not operating temp. hqrl kqnvx voigsh gfwvzz etqtmt sjsuwbs rpvgq swba fsduxix grf
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