When a/c is turned idle fluctuate
Happy new year.
WHAT IS THE RPM>?
hot or cold engine? both key factors.
the a/c puts a large load on the engine
the engine J20 is powerful, and has idle controls
so now those controls are dead.
1: if engine has full power then its not due to lean bogging at idel
2: idle controls failing, ISC failure or failsafe mode.(pcm)
3; Seizing a/c compressor.
idle controls are suspended in fails safe mode
idle controls will fail of engine is real lean.
idle controls will fail if the engine is overloaded.
we check the a/c by hand to see if its ok.
we scan the PCm see if DTC ERRORS. SEE RPM AT 800
See coolant at 180F
we then make sure the engine at hot idle is at closed loop status
if not, we fix that first.
idle is last to fix, all else must be correct or idle will or can fail.
eg: running real lean, running rich and misfiring. etc.
Egr VALVE STUCK OPEN
AND lots more..... ask
SOURCE: replace timing chains on 04
Hi and welcome to FixYa!
Have you replaced the tensioner as well? If not, I strongly suggest that you replace the tensioner. It must be done during the timing chain replacement. Once replaced you'll be good.
Hope this helps and thank you for using FixYa! Have a good one!
SOURCE: j20 engine trottle continues to drop
surge.
2L can sure for many a reason (besides bad tranny "slip")
1: bad need of tune up.
2: EGR sticking open, clean it, the service lists , lists it, at 50k miles.
3: lean fuel mixture.
4: ISC bad or just dirty, we clean ours at EGR clean 50k.
5: in limphome.
is CEL lamp glowing key on, then after started did it go out?
no ?, bad, scan it.
here is the pdf of whole engine above
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