87 camaro 2.8l throwing a 34 code - Team Camaro Tech
Troubleshooting Diagnosing problems done here.

 
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post #1 of 5 (permalink) Old Jan 2nd, 01, 04:39 AM Thread Starter
 
Join Date: Jan 2001
Location: niagara falls,ny,united states
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had starts in the morning, stalls once in ahwile, service light is constantly on.
seems to run fine other than that.

need help want to make sure it is a map sensor first before replacing and where it is located in engine compartment. thanks shawn
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post #2 of 5 (permalink) Old Jan 2nd, 01, 02:48 PM
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CHECK YOUR MASS AIR FLOW SENSOR.Mine would do that drive down the road for a while and start to cut off. I switch it out havent had in problems so far. Hope this helps!


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post #3 of 5 (permalink) Old Jan 2nd, 01, 02:59 PM
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Bill
 
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Shawn,
Keep in mind that the code is on for a reason. It could be a bad map sensor, but it could also be a perfectly good sensor just doing its job and detecting a problem (such as a vacuum leak) Without further troubleshooting, you could just be wasting your money buying a sensor. If a code 34 is for the map sensor, then you need to check the vacuum signal going to it to make sure that something else is not wrong.
Hope this helps,

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Bill Koustenis
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post #4 of 5 (permalink) Old Jun 4th, 01, 01:37 PM
 
Join Date: Jun 2001
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<BLOCKQUOTE>quote:</font><HR>Originally posted by slans29:
had starts in the morning, stalls once in ahwile, service light is constantly on.
seems to run fine other than that.

need help want to make sure it is a map sensor first before replacing and where it is located in engine compartment. thanks shawn
<HR></BLOCKQUOTE>Did you ever solve this problem?I am at the end of my rope with code 34.I have a 1985 with a 2.8ltr.

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post #5 of 5 (permalink) Old Jun 6th, 01, 12:24 PM
 
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First, let's differentiate between MAF and MAP. MAF is mass air flow. It means that the system employs a sensor that directly reads air flow. MAP is manifold absolute pressure; it is a pressure sensor. The system therefore reads throttle position, rpm and manifold pressure, and a preprogrammed constant to CALCULATE air flow. The problem here is with the airflow meter reading below 2 grams per second, which is nearly impossible unless the sensor is malfunctioning or the engine is receiving unmetered air. Therefore, we need to check first for air leaks. Since tyhe 2.8 is notorious for vacuum leaks at the manifold, we need to check for that. A good test for the airflow meter is to tap it while the engine runs, to see if the problem is the sensor itself. If, when the sensor is tapped, the engine stumbles, the sensor can be safely condemned. If following these suggestions, in that order, no issue is resolved, e-mail me with questions. Ray
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