Hi Everyone,
I've been having an idle issue with my car. I found two vacuum leaks and fixed them but the car still wants to surge at idle. Every vacuum line I can find has been checked over and I sprayed carb cleaner all around the intake, plenum, etc.

With the IAC unplugged, the car will idle semi-normal but will fluctuate about 50-100rpm at times. WIth the IAC plugged in, the idle suges approx. 150-200 rpm.

The only place I haven't checked well is the back of the intake manifold. This is due to the plenum, runner, and distributor blocking it.

Can anyone suggest another place to check or another method of checking vacuum?

FYI - I did a search to research this. Also, I do have a custom PROM burned by TPIS for my modifications in my sig.

Any help would be appreciated.

Thanks!

 

You can check the vacuum where the fuel pressure regulator plugs in. I had a similar idle hunting problem with my '87 TPI that drove me crazy. Turned out to be a bad distributor. I had 22in of vacuum at idle but it still hunted.

 

Thanks for the response jv9999.

I've never heard of a distributor causing the idle to hunt?!?

What distributor did you end up going with?

 

For a couple of years now mine had been idle hunting. During this last "no-start" fiasco, I replaced the distributor, remote coil, IAC, CTS and ended up replacing the ECM because of a shorted injector switch. All said and done, my idle is solid @ 600 after warmup. One of those replacements fixed the idle.

Here's the dizzy I got. A bit pricey but highly recommended to me and now you...
http://store.summitracing.com/partde...5&autoview=sku

 

It was intermittently misfiring. You could actually watch it miss on a timing light. I bought a reman unit as I was in a hurry. Ordinary I would have replaced the module and pickup in the old one first. This may not be your problem, but it was definitely mine and drove me crazy for a long time before I found it.

 

my msd dist. did the same thing, even cause the coil to crap out, swapped with a factory dizzy and coil and good again, sent msd back and they rebuilt it.