I recently replaced my 2.8 in my 85 with one from an 87. I heard it run in the old car and it was idling high. When I start it now it goes up above 4500 and then settles down to 3000 then hunts 3000-3500. I noticed the idle adjust screw that's not supposed to be adjusted has been in the past. don't know if I should mess with that or not. Second problem is temp gauge. needle will not move with car running. When shut off it moves up to first mark. I just changed the instrument cluster to try and get a working temp gauge because my old one had a broken needle. While it was out I did the temp gauge fix according to fiero sails site. The only lights that come on now with key on is the door ajar. Maybe a bad connection in the connector? I think the hard part here is not knowing what I have. I may have put in a bad cluster. Any ideas to try? thanks for any replies.

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Scott
85 gt

On the high idle....check your hose to the brake booster.... it takes a major vacuum leak to get an idle that high. If you go through all the possible vacuum leaks and everything is tight, then you need to re-set the screw on the throttle body. There is a protocol for that.

[This message has been edited by Gall757 (edited 05-04-2014).]

Thanks. I was thinking vacuum. I have some hearing loss so I will need another method of finding that kind of problem. Trying to get a friend to come over and listen for me. Will check brake booster hose first.

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Scott
85 gt

I just thought of something. the engine I installed has the egr deleted. my old one did not. using my old computer. possible problem?

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Scott
85 gt

Find the line that comes off the intake to the inline filter on the firewall to the vacuum line to the booster. Plug off the line going towards the intake. If it idles down you found it, On the egr. Find the flex pipe inlet under the intake near the throttle body. A popular test is to cut a piece of can larger than the hole and put the tube fitting back on. Again if it idles down.

Remove the rubber hose from the throttle body and the left vent so you can look down the throttle bore. With no tension on the throttle cable the throttle blade should barley be open almost fully closed if not back the screw off. Also while you are there see if the Idle air control is holding the idle up. you can do this with out removing it by putting your finger over the bypass hole, while running.
You should be able to look at your tach through the window if you can't hear it. And of course BE CAREFUL any time your hands are near a running engine.
There are a few ways to set these properly but it seems you need to hunt some other stuff down first. Do a search, they are here. And that will at least get you close to find what direction you need to go.
The best way to find air leaks even without hearing loss is with smoke. We use a smoker made for this. Bee keeper smokers work. Parafin smoker will work. And the old cigar test works(if you have the lungs for it). Of course engine off plug off the throttle bore. The line to the brake booster works well. You can blow it both ways there. If the booster is bad, smoke will come out near the brake pedal inside.

thanks. I will look at that stuff tomorrow.