Started fine this morning, shut it off to add coolant to pick up tank then wouldent run. No spark to one coil so I replaced it-AC Delco. All coils have spark now. Smells like its getting fuel. Cold morning in MI but car was in garage overnight. Do fuel pumps just quit? Perhaps its a module or sensor. Car has over 100K but is maintained very well. Flordia car. New GM wires, fuel filter and plugs (NGK) within last 18 months. Car normally runs perfect. Recently has had an occasional rough start up idle. Coolant may be leaking in engine also but no sign in oil. Thank you, Dave.
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On the 2.0 and 2.4 engines there is an ignition module that fires the coil from input from the computer and sensors. You may have to get a shop manual to have the testing procedures needed to check the module.
Older VW's and Audi's are notarious for this type of behavior. You actaully need a Vag or good diagnostic tester to tell you which plugs are mis-firing. You will need to replace a coil-pac or two. VW's issued a recall notice about 3 months ago about this issue and intends to re-imburse owners on certain models and years for coil-pac repalcement. After market coil-pacs should cost less than $50.00 each. Hope this helps.
I HAD THE SAME PROBLEM WITH MY 1999 GMC YUKON WITH THE 5.7 ENGINE HAVING TO JUMP START ALL THE TIME TO GET IT RUNNING, THE PROBLEM WITH MINE WAS THE FUEL PUMP HAD TO BE REPLACED, EVEN WHEN I REMOVED THE PUMP AND TURNED THE KEY FUEL PUMPED OUT BUT WAS NOT ENOUGH PRESSURE TO GET AND KEEP THE ENGINE RUNNING.I ALSO TRIED STARTER FLUID, THE ENGINE WOULD RUN UNTIL THE FLUID BURNED OFF.SO THE SOLUTION FOR MY TRUCK WAS THE FUEL PUMP AND NOW ITS STARTING LIKE A CHAMP
I had a similar problem and believe it or not it was the CAT. An easy way to test for this is to remove the O2 sensor right in front of the CAT. Once you removed it, plug it back in while unscrewed from the exhaust pipe and start up the truck. If it runs fine, the CAT is your problem. This is just a guess and it would be an easy and very cheap($0) test. You did not say if the truck was diesel or gas. Mine is gas that was exhibiting the same problem as yours...good luck!