95 Caravan 3.3 Rough idle

[ingenium]

I have been told that a carbon build up causes my car to miss once in awhile at idle speed? Wires/plugs good, car runs great when moving.

Any ideas?

Thx

 

[Bob Shuman]

Clean the throttle body and this will probably solve your problem. I have been told that a carbon build up causes my car to miss once in awhile at idle speed? Wires/plugs good, car runs great when moving.

Any ideas?

Thx

 

[Dave S]

There's a de-carb cleaner that the dealer sells part# 4318001AB. You let the car warm up, shut it off then spray it down the throttle body to get down into the engine and let it sit for about 10 minutes to remove some of the carbon. Restart the car and takes it for a drive to blow out what the cleaner dissolved. I have been told that a carbon build up causes my car to miss once in awhile at idle speed? Wires/plugs good, car runs great when moving.

Any ideas?

Thx

 

[Peter]

Your oxygen sensor may be bad. Unless you are in California, your check engine light will not come on if the O sensor is bad. This causes the mixture to run rich and causes rough idle, poor gas mileage and carbon build.

You can check the fault codes stored in the engine controller usingthe check engine light to see if the O sensor is bad ( or any other sensor or actuator). Fault code for O sensor is "51" on my 92 plymouth and probally is the same for your 95 chrysler.

I have been told that a carbon build up causes my car to miss once in awhile at idle speed? Wires/plugs good, car runs great when moving.

Any ideas?

Thx

 

[Cloaked]

Just a note, the "check engine" light does NOT always come on with a bad O2 sensor!

My 94 GC with 3.3l was running roughly for over a month before the light came on. even then, the light would disappear and not re-light for days.

When I had them put the scope on the O2 sensor and look at the signal, it was just a non-responsive square wave that did not change with varying engine conditions.

Replaced the part, and viola! Runs like a hot damn again.

 

[Bill Putney]

...Replaced the part, and viola! Runs like a hot damn again.

You use musical instruments for exclamations? 8^)

Bill Putney
(To reply by e-mail, replace the last letter of the alphabet in my adddress with the letter 'x')

 

[Geoff]

Subject: Re: 95 Caravan 3.3 Rough idle

You use musical instruments for exclamations? 8^)

Bill Putney
(To reply by e-mail, replace the last letter of the alphabet in my adddress with the letter 'x')

No, Bill, he replaced both the O2 sensor and the under-hood viola, and things were all better again! (Must have had the 'symphony' option.)



--Geoff

 

[Len]

Yes a O2 won't always show, my van failed an etest and when it was hooked to a MAC scanner it showed a voltage change but it was not a big enough change. Changed out the O2 sensor and bang it started showing what it was supposed to and it then passed an etest with flying colours, this is in a 93 GC with 3.3L with well over 300,000K on it.

Just a note, the "check engine" light does NOT always come on with a bad O2 sensor!

My 94 GC with 3.3l was running roughly for over a month before the light came on. even then, the light would disappear and not re-light for days.

When I had them put the scope on the O2 sensor and look at the signal, it was just a non-responsive square wave that did not change with varying engine conditions.

Replaced the part, and viola! Runs like a hot damn again.