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Old 05-09-2011, 05:23 AM
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throttle issues after cleaning engine

Yesterday I decided to clean my engine because it pretty oily and gunked up with dirt. I covered the alternator with a plastic bag and then went to town with some Simple Green. After quite a few sprayings, I closed the hood and let it sit for about 10 min and then sprayed it down with a garden hose.

It sat for about 4 hours before I started it up and tried to go somewhere but I couldn't get any farther than my own driveway. It would idle and go into gear, but I had no throttle response and could only move under idle power. I could put the gas to the floor and nothing would happen.

I let it sit overnight hoping that it would dry out and fix the problem, but it only sorta helped. It was idling rough with the rpms fluctuating. I could drive, but throttle would only kick in with the pedal half to the floor and then I would take off like a rocket. I couldn't do any smooth acceleration.

I'm wondering if I got the PCM or some other electrical part a little too wet. Any ideas?
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Old 05-09-2011, 07:38 AM
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Could be your ECM or the wires going to your injection system. Check the ECM to see if the connections are good, and I would pull them all blow them out with some air, and then place in that water-proof electrical connection goop (on all connections under the hood). That is where I would start and see how that does. The throttle is completely computer run (driven by wire) so if there is a bad connection somewhere it would show by doing some of the things you are mentioning. I would try that electrical connection water proofing goop on all the connectors (junction plugs) and blow them all out with some compressed air (LOW PSI, but enough to move water).

~Phil
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Old 05-09-2011, 12:50 PM
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thanks! I'll check the connections when I get home and report back.
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Old 05-09-2011, 01:56 PM
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every time i wash my truck i rinse off the engine & compartment (knock on wood) ive never had a problem.
& i dont cover anything.
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Old 05-09-2011, 05:51 PM
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I got home and took a can of compressed air and blew out every connector I could get to under the hood. Even took out the PCM and cleaned that out good too. Started it up and it runs fine now. I'm not sure which connector was the culprit, but next time I'll be sure to keep em drier.
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