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Originally Posted by 010175
Thanks for you help on both my problems. The way I understand it is I must take off the intake manifold to get to the fuel presser regulator. Is this true? I was at NAPA buying anti freeze and ask them about the soot and being loaded up when hot. They said that there is an air mixing valve part that might be bad, that is by the manifold somewhere. They said it was not a returnable part because it was electric and the cost is $89.00. I am not so sure they know too much about this, but they might. Do you know what they are talking about and might this be the problem? I have a 1997 2door Tahoe and a 1999 suburban so I could switch parts to test for the bad part if needed. Are there any other parts might be bad before I remove the manifold to replace the fuel pressure regulator? Thanks Dave
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Dave,
I am not familiar with the air mixing valve that Napa is talking about. I suggest you get a fuel pressure gauge and verify that the fuel pressure regulator is not your problem. When I tested my neighbors 97 Yukon, the pressure dropped very fast after turning off the key. Within 30 seconds it went from 60 to 30 PSI.
Yes the FPR is under the top half of the intake and is not a fun job.
Sorry I can't help you with the air mixing valve. Could they be talking about the MAF (Mass Air Flow Sensor)?
Since you know you are running rich, it could be 02, MAF, FRP, a leaking injector. A fuel pressure test should really be done first before throwing parts at the problem.
//2000CAYukon