The issue first appeared while I was driving on the interstate at around 70 mph and would only start happening after about 15-20 (20-25 minutes) miles when the truck was good and warm. It did not seem to happen at anything lower than 65 mph. It would start violently missing/shutting down. Enough to give my head a small jerk. It did not stall or keep me from driving, just a bad jerk. It would keep going and happen every 10 – 20 seconds. Seemed to notice it more going up a hill (more load). When I would get to where I was going, the idle would be racing up and down. Almost to the point of stalling then up to 2K. When I put it in park, it would be fine – so only really happened only under load. When it was cool just driving around town it would not happen.
I took it to my local mechanic and after several hours he gave up and told me to take it to the dealer. My first trip to the dealer cost me almost a thousand. They replaced the ERG assemble, VSV valve, gaskets, etc. Seemed to help a little for a day or so and then back to same old jerking. On next visit they replaced something else in ERG value, distributor, plugs, list goes on. When I got it back this time, it started jerking almost immediately and any speed over 20 mph. They also told me that it could be idle air control valve… did not make sense to me so I took the idle air control off my friends truck (same truck) and it did not make a difference. I gave up at dealer and went back to my normal mechanic – it was doing it all the time now so I thought it would be easier to diagnose. After a full day and several hundred more dollars in labor – still nothing. He said when he hooks it up to gage/computer – as soon as it was under load it would drop to zero. He review all wiring schematics and concluded the only thing he thought it could possibly be is ECM. So… I bought a used ECM. Same thing – no luck. Now the jerking seems to stop after I drive 30 miles or so… so same thing but has reversed how it manifests and when it stops. (This has been consistent before and after putting in new ECM) 5-6 visits to several mechanics and I am $2000 in the hole and it is running worse than ever. One other thing. The other day I stopped to pick something up and when I shut the key off it kept running. When I tried to start it back up it labored very hard but finally started. Every light in the dash came on and stayed on for a mile or so. This was right before I put the new computer on. Only did it this one time, but when it did it trashed the starter. So few hundred more for that. Not sure if it will do it again and trash another starter.
I am going crazy with this issue. Can’t fix it can’t sell it… I have a friend with same truck but a year newer so I can swap out most parts if I could get a clue?
have the same problem?
Friday, March 6th, 2009 AT 4:54 PM