tdee

I have a 1987 pickup 2400 4 cylinder that runs rough.It will idle high at times and then idle rough and burn rich.No codes are present.All tune up's have been done.I checked the operation of the EGR and it is working and no carbon under seat.Any suggestions on this throttle blody engine.tdee

ccooney

I seem to be having a very similar problem. Let me know what you come up with and I'll do the same.

Chris.

Marcus

I too have the same problem except on a 95 pickup with 2.4L 4 cyl and 5spd trans. When truck is idling (stop light) the engine races and I have to touch the gas pedal for it to run down to idle. I'm thinking that in might be the PCV valve but not sure.

aaronford

Going from lean to rich? O2 sensor would be my guess. Maybe an intermittent vac leak? 1987 was 17 years ago. Could be anything.... 1995 sounds like a malfunctioning idle air control, or a sticky throttle plate. Dive in and let us know what ya find.

__________________
Aaron Ford
95 2WD Nissan PU E
2002 Oldsmobile Intrigue GX
"The hard part about playing chicken is knowing when to flinch" Scott Glenn in The Hunt for Red October

dorrisant

buy a cheap vacuum gauge (harbor freight) to indicate possible vacuum leak.