Truck Backfiring/Lurching
#1
Truck Backfiring/Lurching
99 5.9L 4x2 (91K) Truck started lurching on the highway 55-60mph. It does it a bit at slower or faster speeds but not as bad as 55-60. No CEL. I replaced the cat in January and I think I replaced the 8mm wires/plugs at about 75K (can't find my manual right now).
I opened the hood and did the following: 1. Tightened a loose bolt on headers 2. cleaned the electrical connections to injectors 3. checked that all wires were on tight
Now the truck has a bad idle while still cold and backfires. It improves as the truck warms-up but still lurches at highway speeds. Also if I accelerate at 3K rpms it will initially have some backfire/lurch problems but then runs smoothly.
The only thing that I've done to it recently is put gas in it!
Any ideas?
I opened the hood and did the following: 1. Tightened a loose bolt on headers 2. cleaned the electrical connections to injectors 3. checked that all wires were on tight
Now the truck has a bad idle while still cold and backfires. It improves as the truck warms-up but still lurches at highway speeds. Also if I accelerate at 3K rpms it will initially have some backfire/lurch problems but then runs smoothly.
The only thing that I've done to it recently is put gas in it!
Any ideas?
#2
#4
Hmmm...even though I have the Mopar PCM I've been running 87 and staying off of the throttle. On Friday I put 91 in (full tank) and the next day started having problems. The water pump was replaced in January and the mechanics said that the timing chain was still tight.
Any thoughts besides just replacing the plugs and rechecking all of the wiring (MSD, spark plug, etc)?
Any thoughts besides just replacing the plugs and rechecking all of the wiring (MSD, spark plug, etc)?
#6
Are the wires routed per the TSB to prevent crossfire? (do a search on here for"Plug Wire Routing"). 8mm or better wires? Plugs? Type? how old? TPS changed? Or at least tested? Does the truck have cruise control? Good plug wires are worthless without a good cap and rotor(read brass inserts).
#7
Trending Topics
#9
#10