Question about 2004 GMC Envoy

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The problem is engine vibration during start and shut down only

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

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  • GMC Master
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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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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 9 Answers

SOURCE: Envoy 2002 unsteady RPM and engine while stoping

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

  • 57 Answers

SOURCE: hard starts in the morning even though replaced most parts

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

ftw1952
  • 10319 Answers

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

  • 14036 Answers

SOURCE: 1997 jimmy car shut off while driving. replaced

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

ryanlutton
  • 1113 Answers

SOURCE: Slight vibration and rattle at low RPM. Checked

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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Whats wrong when car start but no throttle


does the engine stay idling with no response to throttle movement? or does the engine cut-out when the throttle is pushed?

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Ill answer in the generic and for GAS engines. only.
that is illegal RPM, the ECU regulates it to 800 all the time
that means the ECU can not regulate the RPM now, for many reasons.
and sure it vibrates too low, that is normal for all 4cylinders to do that.
no bad engine mounts never lower RPM to 600, ever.
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Is there a way you can Clarify your Question? There is a lot of words that are not meaning anything.. Is 2-3 RPM an accurate comment or are you meaning 2,000 - 3,000 RPM ?

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I'm not sure exactly which vehicle you have so I'll try to be genera yet as specific as possible to help you determine the problem. I'm assuming here its a Gas Fuel engine.

1.) if its a carburetor type engine, You may need to adjust the RPM to increase or lower the Idle. Its commonly called the Ideal screw and adjust the air fuel ratio to stabilize the engine fuel mixture to increase the RPM.. its found on the Carburetor.

2.) ts fuel injected you will need to adjust the throttle body position to archive the same effect.

if it has a distributor , you can turn the distributor as well to adjust the RPM.


rough idling is usually caused by Mounts, since you changed yours the next most likely issue is the RPM itself or idling speed / rpm. If its to low you ill have that issue.

other possible cause is the distributor points (if any).. bad plugs, bad plug wires.. but those cause other issues while driving as well.

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My 1995 F350 Powerstroke "Shutters"


VIBRATION - DRIVELINE RESONANCE/VIBRATIONBETWEEN 1400 AND 2000 RPM WITH CONVERTER
Clutch ENGAGED DURING MEDIUM TO HEAVY
THROTTLE CONDITIONS - VEHICLES WITH 7.3L DI
TURBO ENGINE AND TRANSMISSION BUILT PRIOR
TO 11/13/95 (5L13)
^ TRANSMISSION - E40D - DRIVELINERESONANCE/VIBRATION BETWEEN 1400 AND 2000
RPM WITH CONVERTER
Clutch ENGAGED
DURING MEDIUM TO HEAVY THROTTLE
CONDITIONS - VEHICLES WITH 7.3L DI TURBO
ENGINE AND TRANSMISSION BUILT PRIOR TO
11/13/95 (5L13)

FORD:
1995-1996 E-350, F-250 CREW CAB, F-350 CREW CAB
Article 96-26-21 is being republished in its entirety as part of a consolidated 7.3L diagnostic aid booklet.
ISSUE
Some vehicles with transmissions built prior to 11/13/95 (5L13) may exhibit a driveline resonance/vibration between 1400 and 2000 RPM with the torque convertor engaged. This may be caused by the torque converter.
ACTION
Prior to torque converter replacement, refer to the following Service Procedure for details to verify conditions.
SERVICE PROCEDURE
1. Verify the resonance/vibration does not occur in neutral and is most noticeable between 1400 and 2000 RPM with the converter clutch engaged during medium to heavy throttle conditions. Also watch for the vibration to diminish at engine speeds lower than 1400 and higher than 2000 RPM. If the concern meets all of these conditions and the transmission has a built date prior to 11/13/95 (5L13), replace the torque converter. Refer to the appropriate Service Manual for removal and installation procedures.
2. If the vibration concerns do not meet the conditions, check for non-factory installed items that could affect driveline and verify proper installation. Also refer to the appropriate Service Manual, Section 05-00 for diagnosis and testing.
107118085

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I have a 2002 durango 4.7. I have a hard time starting it hot or cold.when i get it started it idles fine for a few minuts and then rpm drop and wants to stall out,The truck runs great wile driving but...


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1) It is very possible your engine mounts can be worn, but

2) the vibration you feel may be also due to the idle itself degrading to the point that the car is shaking. Does the engine sound like it is getting ready to die? what is the engine rpm when you feel the vibration? You may just have a dirty throttle body. In this case, clean the throttle body plate and bore and the problem will go away.

3) did the problem seem to come on suddenly or gradually, if gradually, you may just need some plugs and/or wires, and/or cap/ignition rotor, etc. (a tune up)

4) Also, do you only feel the vibration when the AC system is on?

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