GeorgeM

I've had a stalling at idle problem for about a month now. I tried the WD40 trick, but it doesn't really help. Once the car warms up, when I come to a stop, the car will stall. I have to give it gas to get it started and keep it running until I get going.

I've read that it is possible to replace the ICV (I have a new one in hand) without taking the intake off. After pulling the MAF off, I can't see how this is possible.

Has anyone actually done this? I can see getting the terminal off, but getting the hoses off, and particularly back on, seems impossible with the intake on.

I'd like to do the whole job and have the parts powdercoated, etc, etc, but right now, I just want to get it running right for Frenzy.

Bueller?

Thanks for the assistance.
George

Mrmerlin

blow off the intake and around the fuel injectors with compressed air then remove the intake. while you have it our you should replace the knock sensors and the crank position sensor and the TPS as well as the TPS.
Pay attentio0n to the plastic fittings on the sides of the MAF boot they are thin and usually ate prone to cracking

VehiGAZ

It's been said that it is possible if one's hands are small enough, and while I have no basis to deny the claim, I think one would need the hands of an 8-year-old to do it.

My ISV was corroded inside and out, apparently from water in the V at some point, so it was definitely beyond the point where WD-40 could do anything for it.

Louie928

I had the same symptoms you have on a '91GT too, not that it makes a difference. I was procrastinating removing the intake to replace or really clean the ISV until I couldn't take the stalling and nursing with extra throttle to get it started again. I figured I had to get down to it. On a hunch, I took a mirror and looked down at the throttle with the MAF removed. There was some black dirt down at the bottom. I got a can of carb cleaner and thoroughly cleaned the throttle plate and throttle body. I cleaned the front, edges, and back side of the throttle plate and the TB inside as much as I could reach using cleaner soaked small brushes with paper towel to soak up the excess. The first couple of starts were rough and unstable maybe due to extra carb cleaner inside the intake. Once it warmed up and the idle stabilization in the LH got itself figured out, the starting and idle is perfect. I did this about a week ago and it has been solid since. This car has 62,600 miles on it so shouldn't have been very dirty, but it was enough to cause a problem.

GeorgeM

X-ray vision would be nice too.

My ISV still looks brand new on the outside...

Interesting, Louie. Initial quick look didn't show any gunk in there, but I didn't look very closely at the TB. Mine doesn't start acting up until it heats up a bit. Since I've owned it, the idle has always been just fair, a little lumpy, not silky smooth, so I figured that was a vacuum issue that I'd eventually get around to with the intake refresh.

Mine has about 62K now as well.

I'll check it out this evening - maybe I'll get lucky.

Danke!

Louie928

My idle was a lot worse when the engine was cold than when warm and barely acceptable when warm unless careful when shutting the throttle. Your problem sounds different. I hate to say it, but maybe the intake needs to come off.

the flyin' scotsman

Check all the vacuum ports for cracked rubber and lines.............loss of vac. especially around the fuel dampers, regulator and the respective 'tees' may cause your issue. Also I check the fitment of the MAF on the rubber elbow and the air filter lower box to the MAF.

Given the location of the ISV I'd triple check everything else.

GeorgeM

Cleaned the TB, it was a little caked up and intially resistant to manual opening. All the hoses and vac lines I could see looked okay. MAF boot/lower filter box seal was fine, now it's clean and fine, lubed the throttle linkages, etc.

I'll drive it to work tomorrow and see what happens.

Thanks for the inputs.

GeorgeM

Drove it around for a couple of hours in the afternoon and no stalling. Lots of stop and go around town. It was pretty warm out too, 100F sitting the parking lot sun.

I'll try it again next week.

Off to VIR for the weekend (it's our PCA region event, so it's mostly a working weekend)!

Thanks again.

aaron3

I had an idle problem a few years ago, and figured it was the ISV. I ended up pulling the intake because it needed some cosmetic work (looks great in sparkle blue with silver letters). Anyway, when I was pulling stuff apart, I noticed one of the accessible hoses had a long break in it. I had previously inspected all hoses hoping not to have to put the intake, but evidently didn't look well enough. My advice would be to check, squeeze and double check all the hoses you can if you don't want to tackle the intake right now. Good luck.