1999 Tahoe shuts off on and on while driving
Posted 17 June 2006 - 08:50 AM
I have read and read and read and no one seems to have had this problem. I think it all started about 6 months ago when I paid a friend to change my intake manifold gaskets. He removed the distributor and did not mark it. When I got it back it ran great but I had the OBD code that said the dist. was off by more than a degree. He didn't have a scan tool at his shop that could read this spec. I've been driving with it like that since. No drivability issues, nothing.
So back in May I drive to work and everything is normal. When I go to leave I get on the highway and BAM. It felt like someone rear ended me slightly over and over. No this is not the drivetrain clunk that I've been living with for years, this is BAD. Just the night before I'm sure that I got bad gasoline from RaceWay.... So I looked to the fuel system.
It happens over and over, almost like the truck is just cuting itself off randomly. I got back to work and tried it again later, it cut off and I had to pull it home.
NO CODES show up except the one that was there before, for moment I had P0339. Which is the cam shaft sensor... I started out by changing that. Nothing... I was able to get it to run, but it would shut off.
I changed the Fuel pump, Filter, Mass Airflow Sensor, both upstream O2 sensors and plugs. It would start but IDLE rough.
So I work on it and it seems to run better everytime I crank it.
I heard the Idle control valve making funny sounds so I disocnnected it and plugged it back in. It ran like a top after that with a slight rough idle.
So I drive it around for a month and I notice that it kind of did the same thing it was doing a month before but just once and ever so slightly. The next few days it get worse....
This morning I leave my drive way... and BAM... worse than before.... Like the engine is cutting itself off RPM's jumping ALL OVER the place, 0 to 1500 700 500 200. The gauges going nuts.... I've checked all electrical possibilities... everything is fine.... It left me in the middle of the road and kept cutting off while going down the road...
My conclusion... I have no idea. Maybe the distibutor being off for a while caused problem? It idles fine when its not in gear, its hard to crank, sound like a weak battery, but its not.
I don't even want to think about the tranny... My rear differential has a slight gasket leak.
PLease comment on posible solutions... I have to find a ride to work!
Posted 17 June 2006 - 09:41 AM
Posted 17 June 2006 - 10:40 AM
Posted 17 June 2006 - 10:47 AM
Posted 17 June 2006 - 12:32 PM
Posted 17 June 2006 - 03:17 PM
Posted 17 June 2006 - 08:50 PM
I think I might have found something I overlooked before. I just found a wire harness going to the Crankshaft sensor and some other sensors (coolant).. and it wastouching my exaust manifold. Needless to say the loom was burned and one of the small wires in there was completley exposed and probly hitting the manifold. This is probly what is wrong, if not, its definatly something to fix. Can't find the electrical tape though.....
That's more thanlikely the problem, but don't just ignore the timing.
Posted 18 June 2006 - 08:09 AM
PS As the earlier posters stated, I'd agree that you should still get the timing fixed too.
Posted 20 June 2006 - 07:47 AM
As for the timing, of course the dealer did not have time for me yesterday so I must drive it like that for another week.
Could I be doing some major damge with the timing off like that? Man what happend to the days of the timing light and a little patience?