Posted by Anonymous on Oct 14, 2013. I orderd the TPS sensor and the rewire kit as well. Top 6 Bad Throttle Position Sensor Symptoms. Ask Your Own Toyota Question. The throttle position sensor is one of the most crucial components of any fuel injection system, right after the computer and fuel injectors in terms of importance. After poking around, I noticed that if I disconnect the MAP sensor (just the electrical connector), the truck idles great (better than I remember) and runs fine on the highway, no loss of power, no black smoke, really seems to run fine. Because either the sensor is reporting incorrect air amount and or air temperature to the ECU. The throttle position sensor, TPS for short, is a sensor that is used in an internal combustion engine. Runs sweet now if a tad lean still, though to be sorted soon. Except for unplugged tps, which I still don't understand why it would run better that way. Aggghh I need help because I want to sale this car. Yoshi box it mate, had same problems with mine and would only run better if i fooled the ecu by turning the TPS like you, its running too lean and needs richening up, mines a 97 TLS, original ecu, open stubbies and a gutted airbox with K&N, no ram air - streetfightered. A car will not stop working if the MAF sensor gets unplugged. A MAF could be the cause, but anything that makes the airflow measurement less than accurate will have the same effect. I had the scan tool hooked up to it and noticed that with the system in open loop it runs fine and does not load up. MAF unplugged it runs fine. This impacts the fuel and air ratio in the engine, which ultimately affects the car’s performance. Share this conversation. But the good news is, a decent TPS isn’t that hard on your wallet. When we accelerate, the butterfly opens a little or a lot to allow air into the intake manifold, depending on how much you are accelerating. If you plug the TPS back in notice hesitant acceleration or poor fuel economy it typically means that this unit is … Below are common symptoms of a faulty TPS. The simple answer is capital NO! I was rapped. Want Answer 0. But the car drives much better. Car runs rough unplug the vacuum from egr car runs better have replaced the egr pressure feedback sensor. Unplug that and see if you car runs differently (better while driving, worse while idling). Chris. The TPS is used to monitor the position of the throttle butterfly valve. Ask Your Own Ford Question. Will the car stop functioning? If so then it is definitely the MAS (Mass Airflow Sensor). 7) If the throttle position sensor is disconnected the engine will idle very smoothly with no miss. In most of the cases, all of these symptoms will show together making it easier to detect the faulty component. No Engine light warnings. Answered in 2 minutes by: 9/14/2016. … Show Less. We Buy All Cars, Running or Not! Runs great off idle, no black smoke, feels like it's lean at idle as if a hose were disconnected. I am still diagnosing a rough running issue on my 2.4 motor in my cavalier. I cut the 3 wires 5 inch down from the sensor. It takes all the necessary measurements and sends it over to the Electronic Control Module. Theoretically, unplugging the IAC and having the car run better leads me to believe there is a massive post TB air leak making the car run at a higher RPM when the IAC is unplugged. Essentially, a post TB leak is the same as opening the throttle plate. There are many sensors that work with the sensor via the computer. If it runs better with the MAF unplugged it invariable means a duff MAF. The eml will relate to lambda faults because it was unplugged if it runs better indicates it needs replacing, buy one and it'll be fine. why does my truck run better when i unplug my tps 1 Answer. There is no problem unplugging the TPS and trying it out. Then try and set your ECU RPM screw to the same 750-900. Maf connected floods runs rough,unplugged runs better,have changed maf,tps,aic,etc,2 oxy,cel on no codes unplugged,codes plugged in 158.... Show More. Running it unplugged will do no more damage than running it plugged and faulty, either way you need to replace it as soon as possible or you will need a new cat. I popped off my vacuum tree once and the car did something kind of … Thread starter jackclark; Start date Mar 15, 2015; J. jackclark New member. Why The Car Runs Better On Unplugging The Mass Air Flow Sensor. It's actually a very clean, and nice DC5 it just has this issue which is driving me crazy. What’s Your Car Worth? But then I wonder why the IAC would be preventing that from working. GM Sensors have traditionally been outsourced to overseas manufacturers, the same ones who supply throttle position sensors to other makes like Ford and Toyota. It's the electrical socket coming from the carb on the left hand side. A faulty throttle position sensor sends incorrect information to the ECM resulting in various issues in the engine, its performance, and fuel economy. Ron, ASE Certified Technician. A Throttle Position Sensor (TPS) usually detects heat, light, and even moisture. Why Us? You know unplugging your mass airflow sensor is a good way to test it and other sensors, but you also know that driving a bunch with it unplugged isn’t good … Chris. I swapped one out from my old motor(2jz-ge) and it still did the same thing. If your vehicle runs better with out the throttle position sensor (TPS) is unplugged it tells the engine to go to secondary sensor which as a default is typically set to full (open circuit). I had fuel trim malfunction and misfire codes. The biggest problem with a TPS is that it’s so small and intricate, that repairing it is almost always out of the question. Yoshi box it mate, had same problems with mine and would only run better if i fooled the ecu by turning the TPS like you, its running too lean and needs richening up, mines a 97 TLS, original ecu, open stubbies and a gutted airbox with K&N, no ram air - streetfightered. Comment; Flag; More. September 4, … Try it Category: Ford. How it works; What we do; Blog (866) 924-4608. Show Less. Share this conversation. im not sure what the issue would be . 1990 Ford F-150-Maintenance & Repair. In such cases, when the mass airflow sensor is unplugged, the computer no longer receives the erroneous readings. It will also run at slightly higher revs, but if the idel speed is adjusted down to anout 700rpm again it still runs perfectly smoothly with no miss. It is loading up on fuel and running rough and smoking bad. Try unplugging your O2/TPS/ MAF after and see if they have the same result as unplugging your coolant sensor; also test these with a voltmeter. The throttle position sensor only detects the position of the throttle and send it to the CPU with other measurements from the power train and the Map sensor to determine how much fuel should be given the engine. Throttle Position Sensor Test – Here’s What You Need To Know. Take it for a test run to try it out...but keep a clear mind...don't expect it to work better or worse...be carefull in that respect that you don't already know what will happen. Knowing this is crucail. I don't know what the TPS does (I'm too lazy to read through a thousand posts on the Thumpertalk Forum) but it's not essential. Make sure to unplug it before turning it on and plug it back in with everything off, just to be safe. There is actually a recall on this part (at least, for the 2000 Protege). The throttle position sensor is an important element in the operation of the engine. The throttle position sensor test is a key technique to keeping your engines airflow at the correct levels for ample functionality. (havent tried driving this way) only when its plugged in it has the issue. All said and done, the idle didn't change much. I think you should try that AAC clean, disconnect your battery (and put your brake pedal down, to release any residual charge) reconnect battery (this resets your ECU) set your idle screw on your AAC to about 750-900, then unplug TPS and see what happens. (866) 924-4608 FREE ONLINE OFFER. I unplugged the sensor tonight and after a couple minutes it idled smoothly, not rich, and no miss. On top of knowing what happens though when you disconnect it, you also know why you might want to disconnect it and also when to disconnect it. The mass airflow sensor is one of the most important sensors in the car and it functions to help the car run perfectly. Why would a car run better with the mass airflow sensor unplugged? In some cases, the vehicle might run even better if the mass airflow sensor is bad. Ford Mechanic: Ron, ASE Certified Technician replied 4 years ago. Share this post. When the 02 is plugged in, my car idles a little rough, runs rich, and has a slight "miss" to it. I discovered that one of the effects of disconnecting the TPS is that the spark advance is increased significantly by the ECU. If i unplug the Throttle position sensor it runs and revs just fine. I've tried with both old filter and old plugs installed vs new, the one variable between it working and not is the MAF being unplugged. Joined Feb 19, 2015 Messages 8. Change spark plugs (OEM only, nothing fancy). Runs sweet now if a tad lean still, though to be sorted soon. Also, some gas does this worse than others. Print this page; Share this page × Ad. Reconnect TPS - hopefully the revs will stay the same. Answered in 1 hour by: 7/6/2011. Bucking Jeep unless map sensor is unplugged My 92 cherokee runs like crap with the map sensor plugged in,backfires in the air filter,bucks going down the highway,stop signs or red lights,forget it,try to pull away giving it to much gas and falls on it's face,was testing a few things today,thought it was a bad TPS,changed it with 2 others i had laying around,same thing,checked both … It seems to have much better snap off the bottom end as well. it had water in the tank and I've already drained it its a 4.9L L6. The stumbling and farting disappeared. In case the mass airflow sensor is faulty, it gives inaccurate readings to the computer. Also, try cleaning it (Mass Airflow Sensor Cleaner ONLY!) It doesn't throw any codes when the sensor is plugged in. My common sense would say it's a bad 02 sensor, but I'm a novice at tuning these cars and wanted some extra input. Clicking this will make more experts see the question and we will remind you when it gets answered. 5 Related Answers Jonah Oneal. I changed the sensor after that and unplugged the batt for a little while. It invariably means a problem with the air measurement! So here is the highly technical solution.....Unplug the TPS! I have been fighting a rough running problem. 5.8 runs better when o2 sensor is unplugged?? With all its importance, what will happen if it is unplugged? Link to post Share on other sites . So close to just buying a know good running A2 long block and putting it in there. Show More. I soldered instead of crimping the wires together. So you either have a bad sensor or the heated sensing wires are contaminated. and plugging it back in. These can be fuel injected engines or carbureted engines. If you unplug it the car will still run, but will not run as well as if it were still plugged in. Mar 15, 2015 #2 Alright guys i have a single code which is 311 i have check the bottom check valve seems to be operational all the piping is good any how when i unplug the o2 sensor it seems to smooth i mean the motor still shakes … No Engine light warnings. If so it's putting your ecu into limp mode and you shouldn't be abusing the car on this mode, but it is worth testing a little boost to see if the car drives correctly, or the same (as this is where you're getting the issue). Why does my truck die when stopped 1 Answer. 2003 f150 Triton v8 sputters, and has bad acceleration, when coming to stop it dies, starts right back up go further then dies starts back up . DriftworksJames 2 DriftworksJames 2 Newbie; Members; 2 96 posts; Location: … As well as if it is loading up on fuel and running rough and smoking bad TPS sensor the! On fuel and running rough and smoking bad then it is unplugged, the computer no longer the! 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