Question about 2004 GMC Envoy
During driving the car dose not response wile hitting the throttle the engine RPM not move at all it happins severall time after that the maintenance man told me that the catalizer completely closed clocked the catalizer cleend out after that the probler appears the engine vibration during start and shut down only and we replace the engine mounting by new one the proplem is the same no change
I think the catalytic converter ceramic matrix brick is broken up and that is the source of the vibration and noise.d
Posted on Nov 04, 2012
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Posted on Jan 02, 2017
It is your Fan Clutch going. That thing causes all kinds of settings on the computer to readjust as it fails. The fortunate folks that I know that it happened to simply experience a sudden roar of the engine sound,, loss of compression, and just a wide assortment of symptoms. But it was the Fan Clutch. Part only cost about 125 bucks, but after it is installed, a computer download must be performed that is only available from the dearlership. 600 bucks. This should have been a recall item in my opinion,, but.
Posted on Dec 01, 2008
Check the power to the cold start injector. (it's only going to have fire for a few sec. after the key is turned on). If the fire is good, replace the cold start injector. This injector is activated for a few seconds when the engen temp is low to add a little fuel lower down in the intake and closer to the pistons.
Posted on May 20, 2009
SOURCE: shuts down after 1/2 hour drive
The EGR system does this to engine after running a short time. Have it checked out. The valve, solenoid, & the relay for it can all cause this problem
Posted on Mar 28, 2010
SCAN IT SOUND LIKE IDLE SPEED CONTROL PROBLEM.BUT I AM LOOKING AT VACUUM LEAK AT THE INTAKE MANIFOLD BROKE VACUUM HOSE. OR FUEL INJECTORS SEALS LEAKING.
Posted on May 12, 2010
Yes, very common problem. More common is the engine mount, while may look ok, height has been crushed from age. Beware of aftermarket mounts, as they tend to crush more than GM mounts, so the height of the engine/tranny is back to being too low.
Posted on May 31, 2011
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Engine stalling and rough run
issue at low speeds
This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control
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