91 S-10 4.3 code 24

Anyone know what this code is telling me?

Thanks,
Sid

Any driveability problems, this is a map sensor code for a percieved high vacuum under throttle angle , rpm conditions that normally would not generate high vacuum readings.

Any driveability problems, this is a map sensor code for a percieved high vacuum under throttle angle , rpm conditions that normally would not generate high vacuum readings.

Max, thanks for responding, the only driveability problem I am having is when I crowd it, then it bucks, acts like the choke is sticking, similar to a miss, when you let off the throttle it runs fine. Full throttle it runs fine, low throttle it runs fine, when it is under load is when it falters.

Any help would be appreciated.

Sid

If the signal to the ecm is telling the ecm the map sensor is reading a high vacuum it means the voltage the ecm is reading is low coming from the MAP sensor. If you have a DIGITAL voltmeter you can check for a 5 volt reference voltage at the MAP sensor. Do not use an anolog meter or a test light, you can overload the circuit and fry a computer if you use an anolog meter. If you have a low reference voltage that will cause the problem. The problem could be a bad map sensor. A bad vacuum is unlikely since it is reading a high vacuum and not a low vacuum. Without a wiring diagram you can not check for high resistance in the other wires for the MAP sensor, you might want to look at them for any defects you might be able to see