bad things happening
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bad things happening
Hi all, could use a little help if you don't mind. My 92 F-150 is having some issues. Its 2 wheel drive, with a 302 and E40D tranny.
After it warms up, when you try give it gas it will start shaking and sputtering almost like it not getting gas or maybe too much. I would related it to when trying to jet the carb on a motorcycle and if the jet is excessively too big or small, it will just kind of sputter and not really go anywhere. If I back off the gas and ease it on real light it will start to go but by no means in a healthy way.
Now this only happens after it starts to warm up and seems to get progressively worse as its getting up to temprature. Once it hit 190 its just misserable. Its doesn't throw a check engine light.
It actually started just a little bit yesterday when leaving a stop light but then it was fine until this morning. I tried disconnecting the O2 sensor just for the sake of it and no change but the check engine light did come on.
Thanks for any input in advance.
After it warms up, when you try give it gas it will start shaking and sputtering almost like it not getting gas or maybe too much. I would related it to when trying to jet the carb on a motorcycle and if the jet is excessively too big or small, it will just kind of sputter and not really go anywhere. If I back off the gas and ease it on real light it will start to go but by no means in a healthy way.
Now this only happens after it starts to warm up and seems to get progressively worse as its getting up to temprature. Once it hit 190 its just misserable. Its doesn't throw a check engine light.
It actually started just a little bit yesterday when leaving a stop light but then it was fine until this morning. I tried disconnecting the O2 sensor just for the sake of it and no change but the check engine light did come on.
Thanks for any input in advance.
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From: Des Plaines, Illinois
Pull the codes. fordfuelinjection.com Let us know what you come up with.
Could be a number of things. How's the air filter look? Any vac leaks?
Codes will give us insight into the beast.
Could be a number of things. How's the air filter look? Any vac leaks?
Codes will give us insight into the beast.
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I would suspect the fuel pressure regulator for the running problems. Pull the vacum line and see if gas or strong smell of gas is present. If so, the FPR has failed and is dumping way too much fuel.
Good Luck Frank
Good Luck Frank
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I'll work on the codes, its been a while since I've pulled those.
Also some mentioned to me a possible ignition coil thats going out or maybe the ignition control module?
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So you said to break this off the FPR and smell for gas right 
No gas smell.
Good thing shrink tube fixes these things pretty good.
No gas smell.
Good thing shrink tube fixes these things pretty good.
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Little more in detail on the problem here. Its fine when the motor is cold, the problem seems to start when the engine hits about 130 degrees and keeps getting worse until its nearly undrivable when it gets close 190. If I try to maintain speed its not bad but as soon as I start to accelerate it will start chugging, studdering, missing or whatever you want to call it. This will clear up as soon as I let off the gas but will come right back if I try to accelerate again.
Ok, going back to the codes for the egr sensor. Is it possible for the sensor itself to cause this problem? Or could it be the egr valve is shot and the sensor code is something different but not causing the problem. Any other suggestions as to what is affected as the operating temprature raises?
Ok, going back to the codes for the egr sensor. Is it possible for the sensor itself to cause this problem? Or could it be the egr valve is shot and the sensor code is something different but not causing the problem. Any other suggestions as to what is affected as the operating temprature raises?
Senior User
Joined: Dec 2008
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From: Ellensburg, Washington
im almost sure your problem is the engine temp sensor. they dont have to go totally bad... they can get slowly worse. its only a 35 buck part, disconnect the battery when you put the new one in... if you are given and option for a higher quality part DO IT dont bother with the bargain basement chinese crap
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Couple of years ago I replaced the engine temp sensor because it was running rich and it fixed the problem but it never caused anything like this. That was what made me wonder though if it might might be the problem.
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From: Ellensburg, Washington
mine went bad and i had all of those problems. and i didn't always get a cel warning either!
what happens is that when the engine starts the computer automatically sends a rich start up mixture to the engine. as the engine warms the sensor reports incremental temp rise to the computer and lean the mixture accordingly. if the sensor starts going bad it may only report a difference of a few degrees or it could not work at all. with that much variability we could see many different levels of performance and symptoms.
for 35-40 bucks its well worth trying... not to mention the peace of mind that always comes with a new part
what happens is that when the engine starts the computer automatically sends a rich start up mixture to the engine. as the engine warms the sensor reports incremental temp rise to the computer and lean the mixture accordingly. if the sensor starts going bad it may only report a difference of a few degrees or it could not work at all. with that much variability we could see many different levels of performance and symptoms.
for 35-40 bucks its well worth trying... not to mention the peace of mind that always comes with a new part
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From: Ellensburg, Washington
oh, i am almost sure your catalytic converter will be clogged too... mine was because it took for ever to figure out it was the engine temp sensor... running on a rich mix for a long time will build up carbon like you wouldn't believe... the exhaust back pressure could be a big part of your chugging... the cat is ungodly expensive, but you are lucky! your truck has the OBDI computer system which places the o2 sensor before the cat... so you can replace the cat with straight pipe and your emissions system will not be affected
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Not so lucky actually. When I rebuilt the motor a few years ago I had a cracked manifold and headers were cheaper so I have headers with a home built exhaust, 2 into 1 cat with the O2 sensor in the cat. Unfortunately the pipes between the headers and the cat have decided the middle of winter was a good time to rot out so its leaking like pretty bad right now. The cat could very well be clogged but what ever is causing this problem happened in a matter of a day, it may not be the root cause but thats how fast the symptoms showed up.