I have a 1998 2500 sierra that I bought used. If this is the case, it is very difficult to trouble shoot. If the problem goes away now, there is a grounding problem with the PCM itself. Borrow a scan tool from auto zone, and drive around with it plugged into your DLC port. It won't be charging so you cant run it more than 10-15 minutes, but its only a test. Of course the check engine light will come on about the alternator being disconnected. Reconnect the battery and run the engine and see if the problem goes away. Unplug the plug on the back of the alternator also. Wrap the end of the cable with tape to prevent a short. On the back of the alternator, disconnect the B+, thats the fat 8 gauge cable leading eventually to your battery. Next, if that doesn't work, disconnect your battery. Add some extra ground straps to the chassi, transmission ect. However, with your problem I would suspect faulty grounds to the transmission and or PCM first. Most technicians don't have the test equipment for this test. ![]() Yes, it was charging fine, but the AC voltage was leaking through the regulator and confusing the PCM. On that vehicle it was a faulty alternator. Same issue, been to the dealer, numerous things replaced. I have run into this before on a few customers vehicles. Some of these post don't even include engine size. Sorry for the long rant, more info better than none.įirst I would like to commend you on the amount of information you have given about your vehicle. I realize that there could be many components at fault but would like to know where to start troubleshooting. Can you give me any ideas of what may be at fault. My local goodwrench service dealer has no idea what may be causing the problem and I am tired of paying them not to fix the problem. The only code that comes up is the faulty PRV. The dealer ship figures that the stalling and the PRV are two seperate issues. During idling the engine sputters and surges before it stalls. Stalling continues and now more often when idling, warm or cold. 2007 I replaced the battery and did a thourough cleaning of the battery terminals. 2007 dealership replaced ignition harness, and stalling continued. August 2007, Brought truck into dealership and they figured it was a weak fuel pump and was replaced, September 2007 stalling of engine continued. ![]() Stalling contiuned intermittently after replacement. April 2007, Stalling ocurrred at highway speeds (first time), diagnosis was faulty PRV and repaired. Aprill 2007, brought truck in for service and inspection, dealership repaired/replaced the folowing relevant items 1)transmission oil and filter change and flush 2) replace fuel filter 3) changed oil and filter 4)replaced spark plugs, 5)performed semi annual inspection 6)replaced lower intake gasket 7) replaced water pump 8)coolant system change and flush. The relevant service history is as follows. The dealership has replace the valve three times and have no idea what is causing the stall. However when I turn the engine off for thirty seconds than start it, the hard shift disappeears but the code remains. I have had this checked out by the dealer ship (GM Goodwrench) and it is a faulty Pressure regulating valve (PRV)in the transmission that is faulting. Immediately after the stall my transmission will shift hard going from second to third gear. I can start the engine right away and it runs perfectly until the next time it stalls. The idle stall has started in the colder months ( I live in Canada). My truck intermittently stalls while idiling, city speeds and at highway speeds. I own a 1998 GM Sierra 5.7L 2wd automatic.
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