GMC G2500 - Popular Questions, Answers, Tips & Manuals

Could be many things. You can take the spark plug wires at the sprak plug end and check for spark with a tester or visually but you have to be careful so not to get shocked. With the ignition off, renove the wire at soark plug and with an old spark plug insert the plug into wire and make sure you rest the spark plug on a grounded metal surface of the engine bay and crank and look for spark. You can also measure the resistance on each spark plug wire with a multi meter.
Other causes can be weak compression this test will eliminate a lot of conditions like bad valves ir valve seats, rings etc. You can probably rent a comoression tester at autozone and just follow the correct procedure on how to test so u get a correct reading. If you create an account at autozones website you will have access to a lot of repair manuals. Good luck

I agree with you, it sounds like a ground. Black wire, try a redundant ground for park or headlamp.

You need a fuel pump .

Leaking injectors; bad fuel pressure regulator; clogged exhaust; weak spark.

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Only solution is to replace the oil seals

recheck filter is in correctly ---also check for fuel pressure pump may hum but it also has a filter in tank [protects pump]that may be clogged --carboned up egr valve will cause stall with no start as well as clogged cat converter ,

Hello Jamiem, I would remove both driveshafts and flex each joint by hand. If any are hard to flex or make noise, you found your problem.

Adjust expansion gear in back to loosen brake shoe from drum and tap around drum with heavy ball peen hammer and pull side to side

I would find the trany tube first which will be smaller in diameter than the oil one. then go to the dealer if the cap for the tube with no cap has the dipstick on it all in one and make sure the dipstick isn't already down the tube if it is supossed to be attatched to the cap.

spray the cap and distributor and all the HT leads with a water dispersant (wd-40 or CRC spray) Any moisture in the cap will cause a ht short circuit and any dirt tracks outside will do the same.

Did you change the Spark Plugs too? The coil is new you said. Might want to thing about replacing all the Spark Leads to new ones, they may be dead, just replace them all, even the main one.

if vacuume leaks out the control valve replace the control switch

change fan clutch

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Not all of your message made it onto the screen. There are fuseable links on the starter that could have burned in two.

Check the ECM fuses, there are two of them.

Usually a sign of a problem with the switch or the motor in that door.I would check for power and ground at the switch then at the motor.The circuits are reversed for up and down.

On most vehicles the transmission information is inbeded the VIN # or vehicle identifation number . Unfortinatly on GMC and CHEVY its not . It is stamped on the passangers side of the transmission at the rear of the oil pan just above the pan gasket you will likely have to clean it off to read it it will be a 9 digit # with letters being in it . The most common transmission for an automatic is the 4L60-E If the forth digit is D thats what it is . As far as the leak goes you need to deturman where its leaking from the pan gasket or the rear oil seal or is it comeing from in front . Transmission do not normanly leak so make sure that its not engine oil you are seeing that is being blowen back witch is much more comon . Transmission fluid is red and smells differant then engine oil and is thinner . Check the oil level on the transmission see if its red and dose it smell burnt if so it will be more black witch is vary bad . Do you have any shifting problems .Also check your engine oil to compare the 2 oils . In a nut shell its your vehicle and your the olny one that actully look at it and looking saves money and blindly replaceing parts costs a lot and rearly fixes the problem

Dear Rasmussen_40Have you removed the surround covers that protect the top, bottom and indicator/ igntion areas. Once you have, you should find that either a torx bolt/ socket or a pin will remove the additonal lock ring. . . you will also have to remove the ignition barrel otherwise you will encounter a whole heap of trouble with your sterering lock.I hope this is the fixya for you and look forward to hearing how you get on with this issue.Yours sincerelyOuszen