Odd issue, need some insight
Thread Starter
Instructor
Joined: Jun 2014
Posts: 172
Likes: 11
Odd issue, need some insight
Went on a road trip last week to see my family about 180 miles each way. On the return trip I made it about 20 miles from home and the car started missing very badly. I get a buddy with an enclosed to come pick me up. When I get around to looking at it the next day I realized that it was on running on the front 4 cyls. As in 1,3 and 2,4. The rear header tubes were cold while the fronts were hot. Checked the plugs and pulled the valve covers and all looks good. Is this some odd grounding issue possibly? Any input is much appreciated.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Went on a road trip last week to see my family about 180 miles each way. On the return trip I made it about 20 miles from home and the car started missing very badly. I get a buddy with an enclosed to come pick me up. When I get around to looking at it the next day I realized that it was on running on the front 4 cyls. As in 1,3 and 2,4. The rear header tubes were cold while the fronts were hot. Checked the plugs and pulled the valve covers and all looks good. Is this some odd grounding issue possibly? Any input is much appreciated.
Fuel injectors are supplied the same way and fired by the PCM.
IF,,,,,,, you have cylinders that are not firing in each bank and adjacent to each other, you either broke the cam or have a broken valve spring on one of those cylinders and a valve is staying open.
Pull the valve covers and see if you have valve train action on all the valves.
Last edited by Bill Curlee; Jan 20, 2017 at 03:40 PM.
Melting Slicks
Joined: Sep 2008
Posts: 3,138
Likes: 802
From: Espanola New Mexico
You mentioned that you pulled valve covers and did not find any problems, you could have a loss of a ground connection effecting only the 4 rear cylinders. One thing if possible is to be able to verify if the PCM is sending the signal to those coil packs, and of course you can always pull the spark plug wires and check for spark.
