Question about 2004 GMC Sonoma
My sonoma has lost power while driving sounds like fuel starving and unable to build RPMs and vehicle unable to do more than 30 mph
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Posted on Jan 02, 2017
no fuel shut off switch on pickups that i know of possibly bad fuel pump find your red bypass wire at relay to test pump
Posted on Mar 29, 2009
SOURCE: gmc 94 sonoma
try the fuel pump relay... had the same problem... 94 sonoma .. it's the one up under the dash... cost me 400.... i didnt know where the darn thing was!!! chaeck all the normal stuff first...
Posted on May 20, 2009
Pull plug wire and install a philips screwdriver into the plug wire get it 1/4 inch away from a good ground and crank the engine over, is there spark? if so check that you have fuel pressure buy renting a fuel pressure test kit from schucks or auto zone and turn the Key to run position with the gage hooked up, it should read 50 PSI turn key off and wait 20 seconds should still have 20 PSI of fuel pressure, if no fuel pressure check fuel pump relay, then check fuse to pump. if you have a bad relay and are not getting fuel then check the oil pressure switch to see if you have oil pressure at the switch if no pressure then the oil pressure safety switch has died and needs to be replaced and should stark after replacing. If you have fuel then check the timing to see if you slipped timing belt.
Posted on Jun 12, 2009
if no codes yet check and clean egr valve ,pcv valve,air filter and/ fuel pump and pressure regulator may b dropping under load
Posted on Oct 27, 2009
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