Question about 1997 GMC Jimmy
Its your No. 6 Injector. I had the same problem on my 97 Jimmy. Replaced the SPYDER injectors and it runs fine now.
Posted on Feb 25, 2009
HAD THE SAME PROBLEM WITH MY SON 94 MUSTANG, IT STARTED WITH A CODE OF P0340 AND P0306. HE ALSO HAD JUMPING INSTRUMENT GUAGES AND ENGINE RUNNING ROUGH. STARTED THE NORMAL TROUBLE SHOOTING. REPLACE THE CAM SHAFT SENSOR WHICH FIX THE P0340 CODE BUT NOT THE P0306, THEN THE FUEL RELAY CONTROL BOX WENT BAD. THE FUEL PUMP WOULD NOT PUMP, REPLACE THE RELAY BOX, FUEL PUMP STARTED TO WORK BUT MAKING A CLICKING NOISE ALONG WITH THE GUAGES JUMPING. I STARTED TO THINK THERE IS A BAD GROUND ON THE CAR, I REPLACED THE ENGINE GROUND CABLE AND THE CAR FRAME GROUND. FIX THE GUAGE PROBLEM AND THE CLICKING SOUND IN THE RELAY BOX BUT NOT THE P0306. WILL NOW I THINKING THAT I FRIED THE EEC COMPUTER WITHOUT A GOOD GROUND FROM THE PAST PROBLEM, I REPLACED THE COMPUTER BOX AND THE PROBLEM WAS FIX. NO MORE P0306 AND THE ENGINE RUNS GREAT. MY CONCLUSION:::: MY LOST OF A GOOD GROUND BETWEEN THE ENGINE GOUND AND CAR FRAME CAUSE THE RELAY BOX, CAR COMPUTER, AND THE CAM SENSOR TO GO BAD LOOKING FOR A GROUND!!!!!!.
Posted on Feb 24, 2013
P0306 Cylinder 6
Check cylinder six - take a look at the plug to see if it looks OK, inspect the spark plug wire, first to be sure it's fully connected, and second, look inside the boots to be sure there are no burn marks that would indicate that it is arcing. I'd change the plug just because you're taking it out - a new one is only a few bucks, so it doesn't make a lot of sense to put an old one back into a misfiring cylinder. If that shows nothing, you may have a problem with the distributor, cap, or coil pack.
Posted on Jul 29, 2008
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