2001 Dodge Ram POSSIBLE PROBLEM AT WARM UP

HDUNKER

MEMBER
2001 DODGE RAM
V8
4WD
MANUAL
143,215 MILES

Right after I got a fill up at a station the day after they reopened from under ground tank repairs, my truck started to have very hard misses while driving at highway speeds. I thought it was bad gas, but the miss feels like it is cyclic on one cylinder. It will have several misses and then be okay for the rest of the day. It had several misses again this morning on the way to work at 3:00 am while pulling a hill and then was again okay. I now think that the problem may have occured just when the engine was starting to heat up, which I would have been on this hill at that time. I have replaced the spark plugs every 50,000 miles, the cap and rotor every 50,000 miles and the current spark plug wires have 100, 00 miles on them. The fuel line filter was replaced at 100,000 miles with the electric fuel pump being replaced at the same time. Any ideas?

Thursday, September 25th, 2008 AT 8:42 AM

2 Replies

DOCFIXIT

MECHANIC
18,828 POSTS

Hi hdunker
I would say you got water contaminated fuel. Randomly causing lean miss. See if you can get sample of fuel let it sit water will be on bottom. Draining would be best a fuel system flush a must water will corrode pental area of injector.
Good luck
Thanks for donation

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Thursday, September 25th, 2008 AT 3:46 PM

MERLIN2021

MECHANIC
17,250 POSTS

If you have 100,000 on plug wires it is time to replace them, so do that with fresh plugs, check coil resistance. Copper towers=Primary.97-1.18, secondary=11,300-15,300
Syeel towers=.95-1.20 Secondary=11,300-13,300
Fuel pressure is 44-54 with engine off key on and scantool activation of the pump.

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Thursday, September 25th, 2008 AT 3:49 PM