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Chevy Silverado and GMC Sierra Stalling Problem
Something wrong happened with my truck. Engine starts without a problem but right after I change a gear to D, 1 or 2 engine stops suddenly. Thought it couls be transmission but I'm not an expert. Any ideas what would it be.
GMC Sierra 1500 '94
(there is a proper level of transmission fluid)
See Also: Diagnose Engine Stalling Problem
GMC Sierra 1500 '94
(there is a proper level of transmission fluid)
See Also: Diagnose Engine Stalling Problem
0
Comments
What happens is that the solenoid continues to engage the torque converter clutch, so when you go from neutral to any drive or reverse gear, it is just like having the clutch released on a manual transmission.
Hope that helps
COME ON HELP ME OUT HERE
I have run into this before on a few customers vehicles. Same issue, been to the dealer, numerous things replaced. On that vehicle it was a faulty alternator. Yes, it was charging fine, but the AC voltage was leaking through the regulator and confusing the PCM. Most technicians don't have the test equipment for this test.
However, with your problem I would suspect faulty grounds to the transmission and or PCM first. Add some extra ground straps to the chassi, transmission ect. Next, if that doesn't work, disconnect your battery. On the back of the alternator, disconnect the B+, thats the fat 8 gauge cable leading eventually to your battery. Wrap the end of the cable with tape to prevent a short. Unplug the plug on the back of the alternator also. Reconnect the battery and run the engine and see if the problem goes away. Of course the check engine light will come on about the alternator being disconnected. It won't be charging so you cant run it more than 10-15 minutes, but its only a test. If this fails, reconnect everything. Borrow a scan tool from auto zone, and drive around with it plugged into your DLC port. If the problem goes away now, there is a grounding problem with the PCM itself. If this is the case, it is very difficult to trouble shoot. Let me know how it works out. Good luck.
I thought at first the mechanic may have messed up the timing so I brought it back. they double checked and everything was OK. They even checked injection ports and cleaned them. The problem continued, I took it to a transmission shop to see if it was a tranny problem, again no codes, the mechanic took it for a drive and was convinced that there was NOT a problem with the transmission or it's mechanical operation. The transmission was rebuilt about 76,000KM ago, and has only been on light duty. The transmission mechanic thought that it might be related to the ignition. Well, I don't know when the plugs were changed last and the truck has remote start that is no longer able to start the truck. The characteristic of the "hesitation" has not changed and continues to happen at the exact place and time while driving it.
I am at a loss as to what is happening. I would rather not spend ton of money trying to find the problem. Since there are no codes it is kinda hard to pinpoint. I appreciate any assistance I can get on this matter.
regards,
John
Low idle than normal may be the key to this. Check fuel pressure, and throttle body for carbon build up. IAC (idle air control) valve may be malfunctioning and not setting a code(pintal may be stuck in wrong position) I have run into this after manifold has been removed. Pintal position will not set codes for IAC, only electrical malfunctions of the IAC will. Pintal spring may be coked with sludge, impeeding correct relearn proceedure. Recommend cylinder balance test. Verify each cylinder is contributing on its power stroke. If this vehicle was brought to me, this is where I would start.
Keep in mind that my first rule to repair is to fix the obvious first, it might be related. I would focus on the low idle issue first. Even though timing has been checked, check it again by someone else. Timing cannot be accurately checked or set if your idle is below specs. Timing and idle are related. Your emission sticker under the hood will show the specs for timing at what idle rpm. Low idle retards timing, while a higher than normal idle advances timing.
It's been a great truck, but... engine stalls when I use the turn signal to change lanes on the highway, or when coming out of a slow turn when the blinker arm returns. I can't duplicate this by wiggling the blinker arm. I have to put truck in N, and usually restarts first try. I can feel the truck hesitate or bump while changing lanes on the highway (70-80 MPH) if it doesn't stall completely. THANKS for any help. No codes being stored.
very low when I start it and when I come to a stop, sometimes it stalls. I was
told that it could be the iac valve, and then I was told that the 2003 models doesn't
have one. Any replies would Help Thanks.
I was told by tech from the dealership that some sensors do not read on obd2 with out service engine light coming on. if any has run across this or can point me in the right direction I would appreciate it
Engine. 109000 miles. Only on cold mornings/days
does it stall and idle really rough and missfire. Here is the strange part: if I unplug the MAF sensor, it runs
fine. If I plug it back in, goes right back to crap. So I
thought i had found my problem and replaced the MAF Sensor but to my surprise it did the same exact thing. It is throwing a coolant temp sensor code so maybe
that is the culprit. My question is if it is a bad coolant temp sensor, why does it run fine when I unhook the MAF? I also tried unplugging the coolant temp sensor but it still does the same thing if the MAF is plugged up.
It feels like a fuel issue, maybe the fuel/air mixture issue or I am beginining to wonder if could be my timing chain?
Any help is appreciate.
ptmcn