Question about 2000 GMC Jimmy
Suggestion.....I had same problem with my 2000 Jimmy. For your info, aftermarket distributor caps for this engine have a design flaw that causes internal arcing. Buy an AC Delco brand cap. I chased this problem for a month, went through several brands of aftermarket caps, prior to finding this info out.
Posted on Mar 03, 2017
55 psi that may be a little low but would that cause a misfire on cyc 3 only? NO that would affect all cylinders not just one . Do a compression test on # 3 cylinder .
Posted on Mar 02, 2017
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Posted on Jan 02, 2017
Yes . You need an ohm/ volt meter. First check the injector, at the leads of the injector you should have 11 to 15 ohms. At the injector plug with the ignition on you should have 12 volts at one of the wires. To check for fire at the plug put the meter leads on the plug leads and crank the engine. the voltage should spike. My guess is that you have a bad wire on the #3 injector. All the injectors will have 12 volts with key on. The ECM grounds the injectors according to where the crank/cam sensor is. On your vehicle it fires 2 cylinders at a time. This is why I say you have a bad /broken wire. At the #3 injector plug you can also check for ground to the ECM. Instead of putting both leads to the plug you have to first find the ECM wire, then put the meter leads to that wire and ground on the battery. Again it should spike in ohms
Posted on Sep 05, 2011
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