You are here:

Chrysler Repair/P0300 chrysler sebring 1998

Advertisement

Expert: - 7/22/2011


Question
I have 98 chrysler sebring conv. random misfire p0300. I replace distributor cap, rotor, plugs, wire set, new distributor, fuel pump, fuel filter, EGR valve, and still P0300. Compression OK, but manifold vaccuum only 17 hg. Please help

Answer
Hi Vu,
Is the reading on vacuum gauge steady, or varying? 17" of vacuum is in the correct range of 13-22" but describe any variation if noticeable.  Have you tried spraying very short bursts of starter fluid around the perimeter of the intake manifold while the engine is idling to listen for a change in the idle speed which would be a sign of an intake manifold leak? Be careful to just use a tiny burst due to flammability.
Have you checked all the hoses that are attached to intake manifold to look for a cracked hose or loose fitting?
The remaining  possibilities are ground connections of the powertrain controller may be flakey (check the ground at the left strut tower and at the bolt on the rear of the cylinder head near the oil filler cap), injectors may be clogging up, or the honeycomb in the catalytic converter could be loose and off-axis (that partial clogging can be detected by an exhaust shop).
I hope one of these may help. I assume that you erased the code by disconnecting the battery briefly so it is truly a 'fresh' code.
Roland
PS Please 'rate' my answer and where you see the question about a nomination of me to be 'volunteer of the month' consider a 'yes' response. Thank you.  

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.