Join Date: Aug 2011
Location: Warsaw area
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Intermittent surging & rough idle
Early 99 F-350 with 268K BONE STOCK right down to the factory exhaust. Noticed the truck was surging while driving home the other day and it had a rough idle when I came to a stop. Borrowed a scan tool from a friend and pulled the following codes: P1690 (wastegate solenoid), P0381 (glow plug circuit malfunction), P0269 Cylinder 3 Contribution/Balance Fault, and P0284 Cylinder 8 Contribution/Balance Fault.
I did some research and everything I read said it was most likely the CPS. I changed the CPS and cleared the codes. Drove the truck about 30 miles and it ran great but when I did a cylinder balance test it still gave me P0284 Cylinder 8 Contribution/Balance Fault. Drove it today and it ran great for about 20 miles and then it started the surging and rough idle again. I did a full scan, buzz test, and cylinder balance and the only thing I got was P0284 Cylinder 8 Contribution/Balance Fault but after about 5 miles it smoothed out and ran fine again.