1986 Chevy Camaro engine idles rough when cold

Tiny
RYANMARTZ
  • MEMBER
  • 1986 CHEVROLET CAMARO
Engine Performance problem
1986 Chevy Camaro V8 Two Wheel Drive Automatic 130xxx miles

If the engine has been sitting long enough to cool off, it takes a lot of cranking to start it. After finally starting it lets out a big cloud of smoke out of the exhaust and idles really rough & low and will eventually die unless I give it gas until it warms, at which time it runs fine. The engine is a 305 4bbl carburated. I have changed the spark plugs, wires, replaced the egr valve. I was told it might be a bad Coolant temp sensor so I changed that but it's still acting up. Also the oil pressure will drop as the engine heats up. Not in the red but it gets close at times. I was also told this all could be due to low compression in one or more cylinders. What do you think? Ryan
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Monday, May 25th, 2009 AT 11:24 PM

3 Replies

Tiny
RACEFAN966
  • EXPERT
I would check the TPS and the Mixture control solenoid with a digital multi meter. Now I need to know if the carb can be adjusted if need be you can include a pic of the front of the carb. I need to know if you have a digital multi meter to test the TPS and the Mixture control solenoid. Get back to me and we will go from there.
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Tuesday, May 26th, 2009 AT 10:22 AM
Tiny
RYANMARTZ
  • MEMBER
I do have a digital multimeter. The carb is a Rochester quadrajet E4ME and it can be adjusted but the factory caps are still on the 3 adjustment screws.I don't have a camera handy but I could probably get ahold of one if needed.
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Tuesday, May 26th, 2009 AT 10:43 AM
Tiny
RACEFAN966
  • EXPERT
Ok with what you have told me if no engine light is on then I would rebuild the carb so I could remove the factory plugs so I could adjust it. What is more then likely happening is it is running either to lean or rich and with the caps in place you can not make any of the needed adjustments. See these caps are there from the factory so that you can't adjust it but no carb can hold a perfect adjust forever, it was done for emission reasons nothing more. If the carb is in good working condition you could also buy a base gasket and just remove the caps without rebuilding the entire carb. Now if you look at the pic below you will see how I remove those so they can be adjusted in the future. Let me know how it goes


http://www.2carpros.com/forum/automotive_pictures/249564_idlemixturescrews_1.jpg

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Wednesday, May 27th, 2009 AT 10:13 AM

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