Need some troubleshooting help
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Need some troubleshooting help
Hello everyone. I have a 1988 F-150 std cab lwb. It has the 5.0 and an AOD trans. I got it for free from my uncle and it didn't run. I got it towed home and she cranked right up. Okay so here is my dilemma. It was idling rough and surging, so I ran the codes and it was the tps and the Iac. I cleaned the iac and the codes for that went away. I tested the tps and replaced it because it was bad. I then did the cap and rotor, as well as plugs and wires and the fuel filter. It runs much more smoothly now but it has a slight miss all throughout the power band. It causes bucking in the trans and is really annoying. I am currently getting codes 22 and 23 as well as 34. Could anyone guide me as to help me figure out what is wrong with the old girl? I tested for vacuum leaks and there wasn't any. Any help would be greatly appreciated.
Fleet Owner
Joined: Aug 2005
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From: Easton,Ks
All three codes are from all the sensors that use the 5 Volt supply from the EEC Computer. Check the voltage at one of the sensors and see if it is 5 Volts DC +- 0.5 Volts.
If it is not then pull the EEC Computer out and open it up and check the caps for leakage.
The sensors are the TP, MAP & the EVP sensors.
If it is not then pull the EEC Computer out and open it up and check the caps for leakage.
The sensors are the TP, MAP & the EVP sensors.
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woody5484
1987 - 1996 F150 & Larger F-Series Trucks
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Sep 16, 2010 04:41 PM
