Chrysler Repair/misfire #1

Advertisement

Expert: - 10/7/2011


Question
Chrysler 2006 town/country. had misfired in #1 & 4 cylinder. replaced plug on 1 & 4, still misfire, replaced wires on 1 & 4, still misfire, charged all plugs and wire, misfire on #1 and failed o2. replaced coil pack and downstream O2 senor. still back firing. What else to do. I also reset the computer by removing the battery post. What to do???

Answer
Hi Ron,
I assume you have been following the fault codes to see what remains. Maybe a compression test on cylinder #1 would be the next step. Or if both 1 and 4 are still the problem, it might be the cam or crank shaft position sensors are giving a flaky pulse on those two that leads to an issue with the injector pulsation, or the #1 injector may be leaking and that is then causing the backfire.
Roland
PS Sorry for the delay but I just found your question in the 'pool' to which it had been referred by Kevin.

Chrysler Repair

All Answers

Answers by Expert:

Ask Experts

Volunteer

Roland Finston

Expertise

I specialize in Chrysler/Dodge/Plymouth cars, minivans, and SUV's for the model years 1982-2008 based upon my 50-year DIY experience, factory shop manuals and wiring diagrams. I offer fast repair advice to help you minimize repair costs by helping you diagnose and do it yourself. Problems with electronically controlled engines and transmissions as well as body wiring problems are my specialty.

I take questions one at a time between 8am and 10pm CT and attempt to answer within 20 minutes. "Maxed Out" means I am answering another question of otherwise busy, so try again later.

There are answers on file to more than sixteen thousand Chrysler questions at your finger tips: put a few key words in the "find" box (above) or click on "view past answers" for a chronological list of my q and a's. Don't use "Add to this answer" if you still have a question...ask it. As to trucks and jeeps I only have manuals for the '04-'06 model years.

Experience

Five decades as a 'do-it-yourselfer' on domestic and imported cars

Organizations
Yahoo Autos Group called The Chrysler Lebaron Club (co-moderator)

Education/Credentials
Degrees in Physics/bruised knuckles.

Awards and Honors
"Top expert of 2010" and "2011" at Allexperts. Among top 50 experts for years 2006-2009 at Allexperts.

Quickest "average response time" at Allexperts (currently no. 1).

©2012 About.com, a part of The New York Times Company. All rights reserved.