Codes 654 and 452, Engine loping while driving?

1995 FORD F-150
235,000 MILES • 5.8L • 4WD • AUTOMATIC
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GERRY SATTERWHITE
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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.
Nov 11, 2022 at 5:27 PM
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STRAILER
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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.

Nov 12, 2022 at 10:19 AM
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GERRY SATTERWHITE
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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.
Nov 13, 2022 at 10:47 AM
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GERRY SATTERWHITE
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Duplicate post
Nov 13, 2022 at 10:57 AM
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STRAILER
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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.


Nov 14, 2022 at 10:03 AM