Question about 2001 GMC Sonoma Extended Cab

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My 2001 GMC Sonoma is idling rough, starts hard but when accelerates sounds good. I have replaced the fuel pump, fuel filter, and now all the plugs and wires, but still rough?

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Check for vacumn leaks ! Idle air compensator? clean throttle valve oppenings and air port opening,do you have check engine lite on,check EGR valve? Dirty fuel injectors ,bad pressure regulator?Check fuel pressure at fuel rail,at idle !

Posted on Sep 06, 2010

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Engine cut out


Sounds like you may have fuel filter problem. you may want to check the pump and filters located in or near the fuel tank.
Go directly to the source ( Fuel Tank, Pump, Filters, Fuel Pressure Regulator and Injectors )
You may have water or grit in the fuel
Hope this helps

Mar 22, 2014 | GMC Sonoma Cars & Trucks

1 Answer

I have a 1998 GMC Sonoma 4.3 LV6 AT.


Cpuld be bad ignition wires, plugs. Dirty air filter. Plugged up fuel filter. Message me if intrested and I'll tell you how to check.the codes yourself using a paperclip.

Jan 01, 2014 | 1998 GMC Sonoma

1 Answer

2001 GMC SONOMA overheated .. replaced radiator and water pump.. now at starting, the engine shakes a lot . after a few minutes , runs smooth ( normal) need help. any clues??


check to see if the wires are connected good to the mass air flow sensor located in the air filter hose assembly, its possible that when you replaced the water pump the connection was disconnected, making the truck run rough at start up and after warming up run a little smoother. I would also affect the acceleration going down the road.

Oct 04, 2011 | 2001 GMC Sonoma Extended Cab

1 Answer

Have a 98 sonoma rough idle poor acceleration and flashing engine light


HAVE VECHICLE SCANNED.AT AUTO ZONE THEY WILL DO IT FREE.SOUND LIKE FAULTY TPS SENSOR,FAULTY EGR VALVE OR O2 SENSOR.MANY THINGS WILL CAUSE ROUGH IDLING LEAN MISFIRE CAUSED BY VACUUM LEAK PVC VALVE OR INTAKE.CLOGGED FUEL FILTER,DIRTY FUEL INJECTORS.GETTING CAR SCANNED WILL SAVE YOU TIME AND MONEY.

Sep 27, 2010 | GMC Sonoma Cars & Trucks

2 Answers

My GMC stalls on acceleration. It pings, stutters, cuts out etc. I've replaced the fuel pump and filter, the coil, the distributor, 2 sets of plugs and wires, cap and rotor, the alternator, throttle...


pull your valve cover off and check and see if your rocker arms r operating correctly while its running if u replaced all what u said it sound like u have a cam shaft problem upossibly might have cam lobes wipped out

Sep 23, 2010 | 2001 GMC Sonoma Extended Cab

1 Answer

I have a 2001 GMC Sonoma 4.3L that stalled while driving. Will turn over but wont start. Have spark, new battery, and the back spark plugs are dry. No error codes. Has fuel to manifold.


SOUND LIKE FUEL PUMP BAD. CHECK FUEL PUMP RELAY AND FUSE.MAKE SURE YOUR ENGINE IS NOT OVERHEATING.SCAN IT FOR IDLE SPEED CONTROL AND ENGINE COOLANT TEMPERATURE SENSOR FAULTS.

May 12, 2010 | 2001 GMC Sonoma Extended Cab

1 Answer

Gmc sonoma 4.3 1991 rough start up occasionally


check to see if your egr vave is sticking. if so you will need to replace it.

Feb 11, 2010 | 1991 GMC Sonoma

1 Answer

Drove 1991 gmc sonoma 1700 miles and now it wont start or idle...


check the play in the distributor,and check that the fuel pressure is normal

Aug 19, 2009 | 1991 GMC Sonoma

1 Answer

POOR GAS MILEAGE


Have you changed the fuel filter? I know it sounds weird but a plugged filter will make a truck use more gas. The computer tries to compensate for less fuel by commanding the injectors to open longer. Also a plugged filter will cause excess back pressure on the fuel pump making it loud.. Good Luck.

May 29, 2009 | 2001 GMC Sonoma Extended Cab

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