12-31-2018, 07:49 PM | #12 | |
Registered User
Join Date: Feb 2012
Location: Olympia, WA
Posts: 300
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Re: 01 Blazer p0300 code
Quote:
Here is some of my personal experience with the remaining possible causes that may or may not be of use to you: Throttle Position Sensor: When mine went bad, I got a specific trouble code for it. I believe I damaged it accidentally by spraying carb cleaner on it while cleaning the TBI (did not realize this part was still attached and sensitive to chemicals). According to the Haynes manual, a problem in any of the TPS circuits will set a code 21 or 22. Once a trouble code is set, the ECM will use an artificial default value for TPS and some vehicle performance will return. Unfortunately, no test procedure is provided. Mass Airflow Sensor: My S10 has a MAP sensor, which I recently replaced (did not help engine run better). The only MAF sensor I've had trouble with was on an '87 Buick 3.8, and in that case, the ECM stored a trouble code specifically for it. I tried cleaning it, but it did not help, so replaced it, which fixed the problem. At this point, if you can find a shop with the necessary diagnostic equipment that is actually willing to USE it, I would do that. |
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