engine idle

1994 CHEVROLET SILVERADO

246,000 MILES • V8 • 4WD • AUTOMATIC

RICHARD CHOBANIAN

MEMBER
4 POSTS

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.

Mar 25, 2011 at 12:56 PM

RASMATAZ

✓Experienced Mechanic
75,988 POSTS

Do you have a check engine light on ?

Go to this link: https://www.2carpros.com/articles/engine-misfires-or-runs-rough

Mar 25, 2011 at 3:33 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!

Mar 26, 2011 at 6:48 PM

RASMATAZ

✓Experienced Mechanic
75,988 POSTS

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

Mar 26, 2011 at 7:27 PM

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.

Mar 26, 2011 at 8:01 PM

RASMATAZ