Idle WTF?

[Justin]

My idle has always been high, ever since i rebuilt my engine 1000 miles ago. Its sat at about 1k RPMs.

I installed my VPC two days ago and nothing changed...


Today I put in new plugs injectors (440s, fresh bag from RC Eng) and now the idle is about 1500. Its pretty damn high!
If I floor it real quick and letup it'll go down a little bit but then come back up...

how can I get my idle to where the hell its supposed to be???

 

[Joel W.]

Try this troubleshoot on page FI-18
http://groundsky.co.nz/techinfo/TSRM/07_FI.pdf

 

[Justin]

Also, I've just recently noticed that the idle will flucuate... it'll go from 950-1040 very steady like...

any input on what could cause that? I didn't see anything in the TSRM about that....

 

[Nick M]

Start by checking DTC's. You probably have a fault in the idle air control circuit.

edit: look for a vaccum leak also

 

[NashMan]

hey i got an easy way to fix it ajust you thottle plate stop screw

in less you isc is gumbed up and slow reacting

any wyas have fun

 

[Justin]

Start by checking DTC's. You probably have a fault in the idle air control circuit.

edit: look for a vaccum leak also

I'm sorry, DTC's?

I replaced my ISC with another unit I had laying around that I cleaned up very well... When I first installed it idle seemed to be around 800 which was better but not ideal.

After It set for a few hours and I came home the idle was up high again....

I guess FPR and TPS are next.

 

[Racefiend]

Check the isc operation by tsrm, same with tps, and fpr like you say. If all checks ok and you have no vacuum leaks, then adjust your idle screw.

 

[Nick M]

DTC= Diagnostic Trouble Code