Engine idle

RICHARD CHOBANIAN

MEMBER
1994 CHEVROLET SILVERADO
V8
4WD
AUTOMATIC
246,000 MILES

Engine idles good on start up. After a minute or so it feels like intermitant miss not consistant but erratic. No codes. Dist, cap, rotor, plugs, wires and ignition module new. Compreshion test good. Smell fuel on air cleaner.

Friday, March 25th, 2011 AT 7:56 PM

6 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Do you have a check engine light on ?

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Friday, March 25th, 2011 AT 10:33 PM

RICHARD CHOBANIAN

MEMBER
4 POSTS

No active or inactive codes. New engine installed 5 months ago. Suspect iac valve but idle only fluxuates about 50 rpm or throttle body injectors. Fuel pump 6 years old. Pump makes no noise. Compression test good and level all cylinders. Sticky valves? Feels like hard miss!

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Sunday, March 27th, 2011 AT 1:48 AM

RASMATAZ

MECHANIC
75,992 POSTS

Clean the EGR and PCV valves and test the MAP and TPS sensor-

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Sunday, March 27th, 2011 AT 2:27 AM

RICHARD CHOBANIAN

MEMBER
4 POSTS

Ok. Throttle cable controlled. Not wire. PVC valve new.
Had engine sniffed. Found no high emission levels. Did not have this issue until after engine replacement. Plugged egr will pop a code. Bad map will pop a code. Smoke tested intake intake not leaking.

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Sunday, March 27th, 2011 AT 3:01 AM

RASMATAZ