Problem for several years, multiple dealers, still no luck.
We thought we had it when we replaced the MAP sensor in Jan 08, but doing it again. I still think it has something to do with the lower air pressure when it rains. The problem has NEVER occured by washing the truck, and one shop dowsed it in water repeatedly to try to get it to induce problem. It only does this when it rains. No code is ever indicated during or after the problem.
Vehicle will turn over a couple revs when key is reset (and fuel pump recycles). It turns over a few revs then quits. If you do not reset the key, and try to push the key to start from the ON position, it does not catch any revs (no fuel, because no reset) thereafter.
Crank sensor, dist have also been replaced with various tries by dealers, they did nothing, no difference. MAP sensor replace seemed to solve the problem for a couple rains, until now (Live in AZ.)
One of my problems was with a 99 Yukon SLE and it wouldn't start when the air temp was below freezing. It would crank, but for whatever reason the fuel pump would disengage, I used to have to prime the throttle body with gas to keep it running and as soon as the engine got warm, voila! I know it doesn't sound like the same issue, but hear me out. I bought the SUV secondhand. It had an aftermarket security system installed, and according to the dealer who fixed the problem, the original installer tapped into the main wiring harness and made a mess. After replacing the wiring harness, this and a other problems miraculously disappeared. If you have anything tapping into your main wiring harness you may be getting moistur and causing a short. Hope this helps, and if not ... sorry for wasting your time.
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If the car does not have a security system, I would check for voltage at the starter from the battery and from the key switch. The power from the key switch goes thru the neutral safety switch before getting to the starter.
Hi, this is a common issue on this model, the speedometer operates off of a stepper motor , internal to the guage. this motor can bind, resulting in a needle that hangs up.The only true fix, is to replace the entire instrument cluster. This must be done at a dealer, as it has to be programmed upon replacement.Good luck...Coop
It is an internal trans problem. I build transmissions for a GM dealer. It is going to be the input carrier, forward sprag, and 3rd/4th clutches. I have seen several. Get it to your dealer. That truck has a 100,000 mile powertrain warranty. That includes the trans. Good Luck.
alternator needs tested (scoped ) for any dirty power (spikes)...that simple test will eliminate soo many electrical gremlins i cant stress it enough.....causing bad floating grounds and computer misreads of sensitive sensors without tripping codes ... replace alternator if suspicious and watch your other seemingly unrelated issues disappear :)......i know i know i am using a crystal ball here tonight and going out on a limb about this one .... but humor me and test alternator before investing too much other time and money :) good luck
I had a 93 Nissan that had a similar intermittent problem running when wet, humid or after sitting. Usually it would start fine and run well most of the time, but stutter, shake or die. It sometimes had low power and got terrible highway mileage even though it was a 4 cyl. 5 spd. When it was dry and not humid, it ran like it was new. I thought it was the ignition wires and changed them with no results. 2 Nissan dealers said everything was fine--it never acted up when they had it. I found a web site that had Nissan technical service bulletins and found one that described the problem--there's a connector in the wiring that needs replacing. It's wrapped in black tape and is a crimp connection. Dealers told me that couldn't be the problem (it was still under warranty), so I took the truck and bulletin to a non-Nissan mechanic. Within an hour he found the connection, replaced it, and the truck ran perfect after that. Sorry but I don't have the technical service bulletin anymore. I may have found it under a different year . .Good luck.