Codes 654 and 452, Engine loping while driving?

GERRY SATTERWHITE

MEMBER
1995 FORD F-150
5.8L
4WD
AUTOMATIC
235,000 MILES

The engine lopes while driving, won't go over thirty-five MPH, that's when it starts shaking and bucking, runs fine at lower speeds (no bucking) just loping. Most everything under hood (sensors) has been replaced or looked at. Get 654 and 452 OBDI codes.

3 Replies

KEN L

MASTER CERTIFIED MECHANIC
42,883 POSTS

Obd 1 codes are 2 digits? Vacuum leaks? tune up done? We should start with a compression test, this guide can help:

https://www.2carpros.com/articles/how-to-test-engine-compression

Please go over this guide and report back.

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Saturday, November 12th, 2022 AT 10:19 AM

GERRY SATTERWHITE

MEMBER
3 POSTS

Okay, I'll do that as, my muffler man, said drivers side had a miss, I've change wires and plugs plus new distributor. Still with all that's been done, I suspect the PCM, or fuel injection computer Ox sensor idle air control valve stuck open. I have a Ford code reader and book.

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Sunday, November 13th, 2022 AT 10:47 AM

KEN L

MASTER CERTIFIED MECHANIC
42,883 POSTS

To see which cylinder is misfiring you can use a temperature gun on the exhaust manifolds to see which cylinder is running cold, then check the fuel injector pulse.

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

and then see if the cylinder is getting spark.

https://youtu.be/baq_aEWNQ0Y

and

https://www.2carpros.com/articles/how-to-check-for-ignition-spark

Please go over these guides and report back.

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Monday, November 14th, 2022 AT 10:03 AM