88 F150 surging problem
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Freshman User
Joined: Feb 2004
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From: Georgia
88 F150 surging problem
Hi Y'all,
I have an 88 F150 with the 5.0 with EFI and automatic transmision. I recently filled both tanks and put a bottle of injector cleaner in the back tank. This is the first injector cleaner in about a year. After running that tank out (ran very well and seemed to even get a bit better mileage) I refilled the tank and switched to the front tank. After driving home, I noticed the idle was surging from almost stopped to (by ear) around 1200 rpm. Next day I swapped back to the back tank but the same thing happened. It actually seems to be getting worse and will die after idling for a few minutes. It is also hard to crank and when it cranks, I can smell gas fumes.
The truck has been running great with no problems, had the motor rebuilt about 25,000 miles back, have replaced the oxygen sensor about a year ago. Also, the truck seems to run fine other than at an idle. No noticeable loss of power and no noticeable roughness or cutting out while driving. Any and all help would be greatly appreciated. Thank you.
I have an 88 F150 with the 5.0 with EFI and automatic transmision. I recently filled both tanks and put a bottle of injector cleaner in the back tank. This is the first injector cleaner in about a year. After running that tank out (ran very well and seemed to even get a bit better mileage) I refilled the tank and switched to the front tank. After driving home, I noticed the idle was surging from almost stopped to (by ear) around 1200 rpm. Next day I swapped back to the back tank but the same thing happened. It actually seems to be getting worse and will die after idling for a few minutes. It is also hard to crank and when it cranks, I can smell gas fumes.
The truck has been running great with no problems, had the motor rebuilt about 25,000 miles back, have replaced the oxygen sensor about a year ago. Also, the truck seems to run fine other than at an idle. No noticeable loss of power and no noticeable roughness or cutting out while driving. Any and all help would be greatly appreciated. Thank you.
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Joined: Jul 2004
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From: Roland, Ar
My '89 started doing the same thing yesterday and the CEL also came on. I pulled the codes, had code 33: EGR valve not opening or not closing and code 63: TPS signal voltage is to low. I removed the EGR valve and gave it a good cleaning, cleared codes and restarted the engine and the CEL stayed off and engine ran fine for about 1min then started surging again and CEL came back on. Pulled codes again and had 63 so its off to the parts store to buy a TPS and throttle body gasket.
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From: Georgia
The mechanic said that the backup from the catalytic converter was causing wrong codes to be sent. Is this possible?
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Freshman User
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From: Georgia
No, he did not say what the codes were, just that the catalytic converter caused it to give wrong codes. He did mention that he put in a new oxygen sensor, pulled it out after running a few minutes and it was covered in black (soot? grease?) just like the one he originally removed. Also showed me a black spot on his garage floor that he said came from the muffler. There is a smell when you sit and idle, but it is not a sulfer smell, more of just a very bad fuel mixture not burning properly smell. Still, no obvious problem once you give it gas and go down the road.
BTW, thank you kindly for your help.
BTW, thank you kindly for your help.