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1986 Plymouth Reliant engine idles rough when cold.


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trog2016
Novice

Apr 29, 2017, 12:19 PM

Post #1 of 3 (573 views)
1986 Plymouth Reliant engine idles rough when cold. Sign In

My 1986 Plymouth Reliant has a rough idle when the engine is cold but smooths out after it warms up a bit. It gets worse when outside temperatures get colder. The car has had a complete tune-up with plugs, plug wires, distributor cap/rotor, fuel injector(TBI), new timing belt, and throttle position sensor. Anyone have an idea as to what the problem may be ? This Kcar has the 2.5 liter, automatic transmission, and about 133,000 miles on it but in very good condition. Any ideas would be appreciated !


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Apr 29, 2017, 1:53 PM

Post #2 of 3 (569 views)
Re: 1986 Plymouth Reliant engine idles rough when cold. Sign In

Wow - a name I thought was forgotten. Just age look for all spots for vacuum leaks and think about replacing all vacuum hoses if not already done and perfect now.


They just don't age well so no waste in new stuff not expensive just take time to do exactly right one by one,


T



Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Apr 29, 2017, 3:41 PM

Post #3 of 3 (565 views)
Re: 1986 Plymouth Reliant engine idles rough when cold. Sign In

The first thing I would do is take a complete compression test to determine just how healthy the engine is.



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