Question about GMC Cars & Trucks
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Posted on Jan 02, 2017
The mid-02 and up do not have an EGR valve. GM redesigned the 4.3L and introduced it in the middle of the 2002 production run. The fuel injection spider, EGR system, knock sensor type, and a few other "refinements" were made at that time.
Have a scan tool capable of opening and closing the related solenoids in the EVAP system to verify that they were working? Did you check the engine for smoke in the intake that would result from a malfunctioning EVAP purge solenoid? If the purge solenoid were stuck open, then it could act similar to a failed or failing EGR valve.
Have a shop with a dyno, do a Drive cycle to refine the problem. Here is a link on what a drive Cycle is. http://www.obdii.com/drivecycle.html
Good luck and hope this helps. You can always go to Auto Zone and have them scan the truck for any codes, it just may time for a tune up. Not know how the truck has been taken care of before you, try add Marvel Mystery Oil to the engine 1000 miles before it's oil change. That should clean up any internal dirt and do not use any engine oil flush, that just promotes oil leak.
Keep me posted on how things are going, I also found that the only thing the GM 4.3 like is the OEM distributor cap and rotor, every after market gave me a rough running engine.
Posted on May 13, 2009
You have to the EGR valve (sometimes the Intake manifold to EGR Vlalve line also). After you remove it take a drill bit the about 20 % smaller than the actual hole of the outlet side and rotate the drill bit with your hand to dig out the carbon. Aditionally the line coming from the intake manifold to the EGR valve will clog near the connection to the EGR valve. I use either a single piece of copper wire or the wire that you would use to tie ribar together to clean the line. When your done cleaning take a piece of vacuum line and connect it to the diaphram side and **** on it... then plug the line well with your thumb. Grasp the valve and blow thru it... Air should blow thru it freely. Remove your thumb from the vacuum line and try blowing again.. No air should pass thru the valve.
Then reinstall the valve and start the vehicle with the vacuum line disconnected (but blocked off) Use another piece of vacuum line connected to the diaphram again and **** on the line.. The vehicle should die or run really bad. If it does this then you cleaned it correctly.
Posted on Jan 20, 2010
SOURCE: 1996 gmc sonoma 2.2 engine
For 1996 GMC Truck Sonoma 2WD 2.2L
SFI OHV 4cyl
The EGR Valve is located under hood, center, rear engine area, mounted top rear driver side of engine.
Fig. 11: Unfasten the EGR valve retaining bolts...
Fig. 12: ...then remove the EGR valve from the vehicle
I really hope help with this (remember rated and comment this post).
Posted on Mar 10, 2010
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