1985 Plymouth Reliant NO IDLE

Tiny
BUTTERZOWEY
  • MEMBER
  • 1985 PLYMOUTH RELIANT
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 450,000 MILES
The engine is a 2.6L Mitsubishi engine with 450,000 Km on her. This engine has given me years of great service. The other day I drove to work (around 20km) and as I pulled in to park she died. It restarted right away, but would not idle. I have turned the curb idle way up so that I can drive the car. When she is cold it runs fine and as it warms up the idle gets rougher and rougher. I checked all the vacuum line for cracks and found nothing. I sprayed soap water on everything and found that the intake manifold gasket was leaking. Changed that and it help a bit. I have done a compression test with results of around 150psi on all four cylinders, with no leak down at all. This leaves the carb which seems to be working fine. If I cover half of the carb the engine runs perfect. She is getting too much air but I have no idea from where. I also have removed the egr system and that is all blocked off. Should I pop the head off, don't want to because the head gasket is only one year old.
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Sunday, January 18th, 2009 AT 12:56 AM

1 Reply

Tiny
JACK42
  • EXPERT
Could be something plugging the idle circuit in the carb. Try spraying around the engine with carb cleaner looking for vacuum leaks, it works a little better. You may be looking at finding someone who specializes in carbs to take a look at it.
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Sunday, January 18th, 2009 AT 7:04 AM

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