ranger306ci

I just bought a '85 gsl-se, with 100K on the motor. It has been babied from birth by my mother in law.

Anyway, when I start it up in the mornings, sometimes the idle runs up to 3000 rpm, very fast. I will stay there unless I put a little load on the engine to drop it, and then it will run about 2000, until it warms up.

This morning, though, when I got home from work(30 minute drive), it did something very strange. When I pulled in the driveway and took it out of gear, it started reving itself, from 1000 to 3000. Up and down, up and down. I shut it off, then restarted it. It then acted cold, although it was warmed up.

What controls the idle speed, and why would it do this?

Gregs

sounds like you have a faulty throttle positioning sensor, or yours is badly out of adjustment

Rx-7Doctor

iTrader: (13)

This is unfortuantely a very common problem on the se's, get a haynes repair manual or
do a search thru the threads, it is a multiple step process of checking the system and takes
awhile to verify everything from the tps adjustment to all electrical connections to proper adjustment on the t/b and could lead alll the way up to a pin test at the ecu. Yes it is the
biggest nightmare on the se's. Remember what doesn't kill you, makes you stronger. Or in this case gives you a major headache and challenge. LOL. rx7doctor

riofrio

I'd also say start with the TPS.
Here, this should help you with any idle issues... http://www.nellump.net/peri/epi/firs...gslseIdle.html

Also, since it's been 'babied' for 20 years... I'd recommend some kind of a powerfoam treatment on the engine.... then make sure you always rev it up high every once in a while.
Oh yeah, and show us some pictures!

ranger306ci

Yea, I found the links to the idle problem, so I will get it fixed. I know alot about conventional fuel injection, so I had a pretty good idea what could be causing it, I just haven't had time to learn my engine. I am getting the repair manual from my father in law this month.

As for powerfoaming it, I really don't think that I need to. I have been driving it like I stole it since I bought it a couple of months ago. Keeping the revs up, to get the carbon out. It is running pretty clean, keeping a close eye on the ol right now.

This car has never seen a winter, but has been run every week while in winter storage.

The only flaws on the car is the paint('cause it is old, faded and orange peeled in a couple of spots); and the mat below the hatchback is pretty faded. Everything else is perfect. The seats and interior are very new looking, no stains, I even still have the cover for the sunroof when I take it out.

I will post some pics in a couple of days, When I get a chance!

Thanks for the interest!
Ken Johnson