rough idle and stalling - Team Camaro Tech
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post #1 of 9 (permalink) Old Nov 5th, 00, 09:12 AM Thread Starter
 
Join Date: Nov 2000
Location: honolulu, hawaii
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Question

my 86 iroc-z with 305 tpi will start but stalls quickly. If I give it gas it will run but rough at lower rpm but smooths out at higher rpm. It is not drivable, stalls when put in gear. Have checked mostly everything and no codes on comp. When I spray carb cleaner into the T.B. it runs fine for a few secs. I Have changed the fuel filter, fuel pump and pressure is good. New holley fuel reg installed. timing is good with new plugs and wires. All new intake gaskets. checked all vacuum lines too. New cap and and rotor on dist. New O2 sensor. I am out of anymore ideas.

[This message has been edited by thumper7999 (edited 11-05-2000).]

[This message has been edited by thumper7999 (edited 11-05-2000).]
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post #2 of 9 (permalink) Old Nov 5th, 00, 11:11 AM
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Thumper,

I know you said you have checked for vacuum leaks, but there are some lines under the plenum also.

Since you have installed a new dist cap be sure it's not cross wired.

Since it does run with carb cleaner though, if you got some bad or watered down fuel, you may need to get the kit (3M) that has the hose that connects to the fuel press barb on your fuel rail, and clean your injectors.

Larry
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post #3 of 9 (permalink) Old Nov 5th, 00, 01:45 PM
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A sticky EGR valve can do the same thing. The valve is closed at an idle and won't open until rpms increase.
Try a visual check first and if all looks good, then try hooking up a vacuum pump and check if the operation is correct.

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post #4 of 9 (permalink) Old Nov 6th, 00, 06:58 AM Thread Starter
 
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Thanks guys. I have looked at the egr and moved it manually with little effort. I also tried blocking it off. I do know there is water in my fuel but how much in the tank I don't know. I will try that 3M injector cleaner if I can find it in hawaii. Sometimes it picks up RPM by itself but at the low end. And when I give it gas and it gets going it backfires. Please keep the ideas coming. It is greatly appreciated.

[This message has been edited by thumper7999 (edited 11-06-2000).]

[This message has been edited by thumper7999 (edited 11-06-2000).]
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post #5 of 9 (permalink) Old Nov 6th, 00, 10:41 AM
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This sounds strange.
First I would get all the water and moisture out of your gas tank. This would not cause backfires though. Try turning your distributer clockwise an inch or two. A dist to advanced would cause a car to backfire.
good luck
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post #6 of 9 (permalink) Old Nov 6th, 00, 02:10 PM Thread Starter
 
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I have tried advancing and retarding the dist but seems best at the correct timing. After i set the correct timing it ran normal for a few minutes but then went back to having problems.

[This message has been edited by thumper7999 (edited 11-06-2000).]
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post #7 of 9 (permalink) Old Nov 7th, 00, 09:04 AM
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Hmmm
How is your carb? Is it original?
If the carb is over 5years old it may be heat warped. Since it seems to run after a cleaning this could be the demon. I would open the carb up and take a look see. If you replace it don't go too big. stick with stock 4bbl.
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post #8 of 9 (permalink) Old Nov 7th, 00, 05:19 PM
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Red face

if it runs right for a wile after timing it, it may be beacuse the esc {electroinic spark contro). im not sure how to check it. you may try the computer again i think it is a code 42 and 43. you may also have a loose distributor hold down.
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post #9 of 9 (permalink) Old Nov 9th, 00, 07:22 AM
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sounds like a problem i had with my 68. one day it would run fine, next day it would severely stumble. when you flogged it, it would lose the stumble and then it would come back. i tried everything then someone suggested i check the fuel sending unit. i did and the filter was rotted off. ive had it out 5 times since with no problems (knock on wood). just a thought if everthing else fails.
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