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Old 11-20-2009, 12:50 PM   #2
catvents
AF Regular
 
Join Date: Mar 2005
Location: Champlain, New York
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Re: New coil; still missing/bucking; '99 3.8L

Quote:
Originally Posted by Windywoes View Post
I installed the new coil purchased through Amazon. Fit well. No issues there. Unfortunately Windy is still bucking/missing when slowly accelerating from low speed and low RPM while in 3rd or 4th gear.

To date I have installed new wires (plugs have about 25,000 on them), new DPFE, new coil, 2 cans of Berryman's in the past 12 months, checked EGR function, cleaned EGR ports, and I have checked for vacuum leaks as best I can. Windy has 138,000 miles on her.

Unless someone chimes in my next plan of attack is:
- re-check the function of the DPFE
- new Autolite 105 style plugs that are supposed to be a bit longer than the 700 series I now have installed
- remove injectors for inspection or cleaning
- check fuel pressure
- install new fuel filter (current one has 15,000 on it)

Thanks to anyone who offered help previously.
Just before to make another attempt, maybe you could just check the spark plugs ( at least the 3 one at the front) and see if there are clean; my winnie has a lot of milage, and from time to time I have to clean 1 spark plug ( fortunatly at the front of the engine), because the valve seals leave a little bit of oil coming inside of the combustion chamber, and cause a light misfire of the spark plug.
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