idle problems! help me please

Divergent Lightning

Divergent Lightning

woah
So I just finished putting everything back together from the cam install. I was sure to bolt everything down to spec. I also put in a set of 50# injectors and got the chip reprogrammed for tha tas well.

I got it to fire it up and it cranks nicely and idles. Though it starts to idle a little high. Around 850 RPMs. Then after a few minutes of that, it jumps out of that rhythm and shoots up to 1500 RPM and jumps around from 1250 to 1900 RPMs. I hoooked data master up to it and prior to the erratic idle it was showing really rich, O2 mV in the 950 range, my IAC was at about 33. I would have numbers from the erratic idle part but Datamaster cut out the instant it started doing it.

I haven't tried to drive it yet like this and I won't if I don't have to. Any help is greatly appreciated.
 
SpoolingTurbo6

SpoolingTurbo6

Donating Member
Re: idle problems! help me please

Might have been a bad burn on a chip.I've seen it happen before
If not that ......Maybe a vacuum leak.
If not that Try fuel presure
If not that Try re-addjusting the rockers
If not that SHOOT THE DANG THING
 
Divergent Lightning

Divergent Lightning

woah
Re: idle problems! help me please

I toned down the fuel pressure a little bit adn It settled down to about 750 RPMs and stays there. Now I just have a lot of konck to deal with and figure out. perhaps fouled plugs? ;)
 
critical

critical

meltdown
Re: idle problems! help me please

Did you mess w/ the throttle position sensor? Test it to make sure it is in spec. That will fool the ecu to believe otherwise. Is your tps filthy w/ oil? If so, its probly shot. Caused by a worn throttle shaft. Test tps by using a volt meter -red lead to the blue wire in the middle of tps, and black lead to gnd. Voltage should be 1.25 volts, w/ throttle closed. Key on, engine off. I used a tps from an `89 iroc 350, because they are adjustable. If you go that route, hog out the holes for easier positioning. good luck!
 
Divergent Lightning

Divergent Lightning

woah
Re: idle problems! help me please

Alright so I found some vacuum leaks. I forgot to put the PCV valves back on and I had a slight leak where I probably should have put some teflon tape on the IA temp sensor on the upper manifold.

I still have an occasional miss. It doesn't happen every RPM, just every so often. It has me really confused.
Still running really rich too.
 
You must log in or register to reply here.
Top