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Chrysler Repair/'91 3.3L rough idle

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Expert: - 8/16/2011


Question
QUESTION: Hi,
I have a 1991 Chrysler Imperial with a 3.3L and it has a rough idle and a feels like a miss when driving. I've seen you mention a poorly seated EGR valve to be sometimes the culprit.Do you think to be the case with me. And if so where is it located on the engine I can't seem to find it.Or could it be something else.

Thank you

ANSWER: Hi anthony ,
my internet connection is down, back tomorrow.

---------- FOLLOW-UP ----------

QUESTION: Hi Roland,
Was wondering if you had any thoughts on my issue I'm having. I was told the EGR valve is under the throttle body on my car but I searched under the throttle body and I don't see it.Any info would be helpful.
Thanks

ANSWER: Hi Anthony,
Yes, the engine would have an egr but only if it was sold initially in California. It would be mounted at far end of a a small pipe that branches off the rear exhaust manifold at its center outlet, and routes over to the throttle body area. So unless you have such a vehicle there is no egr. Let me know if so and I can give you the details about its function/mal-function. Interestingly too is that the 3.8L engine nationwide did have the egr in '91.
Roland
PS By the time I sorted out the internet connection your question had slipped my mind.

---------- FOLLOW-UP ----------

QUESTION: Hi Roland,
No mine was sold in Michigan so there is no EGR valve. So then what could be the problem?

Thank you

Answer
Hi Andrew:
I don't recal whether you did the fault code readout using the ignition key:"on-off-on-off-on and leave on" doing that in 5 seconds or less elapsed time. Then count the number of flashes before each pause shown by the check engine light. Repeat the process to assure an accurate set of flash counts. Then let me know the counts in order of appearance. May one of the codes will explain a reason for the rough idle.
Roland
PS Just to be certain on the egr you could look at the sticker on the underside of the hood to see if the vacuum diagram shows an egr. It shouldn't if the manual I have is accurate.

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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).

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