Question about 2003 GMC Envoy
You need to get rid of that aftermarket air intake . And put the mass air flow sensor back on .
Posted on Dec 19, 2016
Where's the MAF sensor? Looks like it didn't get put in with the new air plenum.
Posted on Dec 22, 2016
On a side note Simon, our 4.2's seem to like only one spark plug.
AC Delco 41-103, which is Iridium, most other brands will have a rougher idle, which is very well documented for our vehicle.
Posted on Dec 22, 2016
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Posted on Jan 02, 2017
The fact that you get enhanced ignition by physically enriching the fuel air mix indicates that the normal mix is too lean, either too little fuel or too much air. 1) Check for leaks of un-metered air in to the air ducting and inlet manifold. Look for cracks and poor joints to all vacuum lines including the evaporative emission recovery lines. 2) Check that the EGR valve is closed off at start up: this should stay closed until engine has warmed up. 3) Finally check that the coolant temperature sensor is working OK; the sensor should be informing the ECU that the engine is cold and the ECU responds by ensuring an enriched fuel mix (by prolonging the injection cycle) during engine warm up.
Posted on Jul 26, 2010
Testimonial: "Very helpful. "
try this b4 taking things apart... redexe/wynns fuel additive and using high octane fuel the computer will adjust running accordingly...
Posted on Mar 09, 2010
sensors on the pedal?? not sure what you mean by paddel though never heard of this term before
Posted on Dec 14, 2009
Testimonial: "03 Envoy:My reduced engine power keeps happening. My car goes 20 mph. Changed throttle body, pedal, wiring. Need new thermostat. Car not heating up."
right hand side of the intake housing where the butterfly is ----a black plastic box held on with 4 star headed screws ,the carbon tracks inside are pitted and burnt
Posted on Nov 20, 2009
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