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rruff1951
New User
Jul 19, 2011, 11:11 AM
Post #1 of 2
(1494 views)
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1990 Z24 3.1 Trouble
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I have a 1990 Z24 . The engine only has about 45,000 miles . I have a miss at idle and also when going slow or up hill going slow . If you give it a lot of gas or slam it there is no problem ,it will even smoke the tires from dead stop . The problem only seems to be at idle or driving along at normal speeds . I replaced the flowing. Coils , ing. module, spark plugs and wires , EGR value, Check fuel injector wiring harness, also injectors plus but new O rings on injectors,fuel filter,checked for vacuum leaks, crankshaft sensor and replaced map sensor. What am I missing . Can someone please help ???. It is a automatic with a 3.1 . Thank You
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Sidom
Veteran
/ Moderator
Jul 19, 2011, 2:39 PM
Post #2 of 2
(1477 views)
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Re: 1990 Z24 3.1 Trouble
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The 1st thing you need to do that would really help would be to find out which cylinders are missing so you can narrow the search......
Really by reading your post the 1s thing that came to mind was a vacuum leak but I'm not sure how you checked for that. Also a sticky valve could cause this. A hot & cold compression test & running compression test on the affected cyl's & a couple good cyl's could really tell a lot.
Problem is, if you're gonna drive it hard then problems like this are gonna happen....
One other suggestion I'm going to toss out is, doing it yourself is fine but you really need a point where you stop tossing parts at it & take it in to get diag'd.
Most places range between $80 & $125. Just a fraction of those parts you've changed would've paid for that....Something to think about
(This post was edited by Sidom on Jul 19, 2011, 2:40 PM)
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