This is where we need to go regardless of what was replaced. There are new parts that are defective so we shouldn't assume they are good. I would start with vacuum check. Here is the list to start with:
There was a recall campaign for the cat. Converters. Typically with a recall for emision or saftey, it will go beyond the normal warranty period. IT was regarding internal deterioration. May be worth a call to the dealer.
You can disconnect the exhaust to check for restrictions.
Measure the vacuum at the manifold it should be more than 17.7 Hg
Check the MAF voltage.
At idle it should be 1.8 to 1.2V and
at increased idle it should be 3.5 to 4.0V
Re-check the fuel pressure for spec.
With engine speed at Idle (750-850 rpm) and pressure gauge connected between fuel inlet hose and fuel filter, is should be at 34 psi. With the vacuum hose disconnected at pressure regulator is should jump to 42 psi.
IF all of the above checks out good, then you'll need to go to checking the in voltage at the ecm.
Saturday, August 25th, 2007 AT 4:31 AM