I finished installing a used engine in the car. when I fired it up the car wont stay at idle, it keeps jumping from 800 to 1200. when I unplugged the maf sensor the car idles perfect. I did the 20 stomps on the brake pedal to reset the ess. anything else I might be missing?


thanks in advance

 

I like to add the car revs up fine through all rpms it just the idling problem when the maf is connected. im getting a cel i should check that out.

 

Possibly a vacuum leak.


Something similar happened to me when I did not plug my ecu back in properly.

 

i did unplug the whole ecu. let me check that out. be right back.

 

ecu is plugged in correctrly. damn im so close to finishing. probably is a vacuum leak

 

You need the car to drive a few miles. The the ECU learns the mixture and idles properly.

You can usually do it by going around the block a couple of times.

 

cool deal. i took it out for a spin yesterday after taking off the cars runs nice through all gears, its just the idling that messed up. i guess i gotta keep driving it. thanks for the tips guys

 

Update: figured out that it was the ssv actuator that was causing the bad idle. it looks all rusted up and the little metal leverage it has at the bottom is very loss. after holding the leverage with a screw driver the car idled perfect. saturday im going to swap the one from my old engine to this one. anybody know an easy way to do this? it pretty hidden up the intake manifold.

 

i think im just gonna swap that peice of the intake manifild. the vdi on the doner engine wasnt looking to good neither. very rusted. maybe give the inside of the intake a little cleaning too.