trouble keeping running - Team Camaro Tech
Troubleshooting Diagnosing problems done here.

 
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post #1 of 6 (permalink) Old Mar 9th, 02, 12:17 PM Thread Starter
 
Join Date: May 2001
Location: cheektowaga,n.y. -united states
Posts: 12
Hi I have an 86 camaro rs I just recently installed a rebuilt 2.8 multi port feul injected motor. I heard motor run before I bought it and it sounded great now that I have installed it it sounds like crap. It will run to high idle when i start it then it will run down to low idle after 5 seconds and it will go so low that it just dies out. I checked my maf sensor, feul pressure, I changed spark plugs and wires and cap and rotor everything works. Is there something i need to adjust to get it to run properly. Please help.

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86 camaro rs
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post #2 of 6 (permalink) Old Mar 10th, 02, 09:00 AM
Tech Team
 
Join Date: Dec 2001
Location: niagara falls ny
Posts: 91
hey cheektowaga,n.y thats coo to see someone else from around here im in niagara falls but to ur prob i dont really know what would cauz that. someone will get to helping ya though
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post #3 of 6 (permalink) Old Mar 12th, 02, 02:33 PM
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Joe
 
Join Date: Aug 2001
Location: san jose ca usa
Posts: 503
GM cars need to relearn how to run after the battery has been disconnected. I would try and run the engine up to 1500 rpm for 10 mins. and see if it will idle properly.

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70 Camaro 307cid(350soon) /350th ex. dark purple (dark blue soon) in. black
74 Trans Am 400cid/th400 ex. red in. red power windows
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post #4 of 6 (permalink) Old Mar 12th, 02, 03:38 PM
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Matt Jones
 
Join Date: Jan 2002
Location: Renton, WA USA
Posts: 2,765
When the computer re-learns it's parameters, you should not touch the throttle. The idle will be fairly high by itself after it has been disconnected, and will re-set when the car is driven about 30MPH.

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1969 Base Camaro
Vortec 350, Perf. RPM, Demon Carb., TH-400
All sheetmetal is NOS GM
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post #5 of 6 (permalink) Old Mar 12th, 02, 04:26 PM
msb
 
Join Date: Feb 2002
Posts: 33
I can't remember any camaro needing to have the idle relearned. But as Silver69Camaro
said, you don't touch the throttle while doing it. I always used the GM scan tool to do it, but it can be done by letting the engine idle for about 20 minutes or about how long it takes on a cold start till the cooling fan comes on. Some older Caddies and W bodies are the only ones I can think of that need this.

Try cleaning the throttle blade and throat. Use some carb cleaner and an old tooth brush or rag. Don't use a wire brush, there is a clear coat inside the intake to smooth it out for better flow. You'll damage it and cause it to flake off. Take the idle air control valve off. DO NOT SPRAY IT with choke cleaner. Spray choke cleaner on a rag and them clean the tip with the rag. Spraying it will mess the motor up the moves the plunger. And spray the IAC ports in the intake with choke cleaner.

See if that helps any.

[This message has been edited by msb (edited 03-12-2002).]
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post #6 of 6 (permalink) Old Mar 12th, 02, 11:58 PM
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Join Date: Dec 2001
Location: Mt Washington Ky
Posts: 127
You need to check volts on the TPS sensor with the car off but the key turned to know what volts your MAF is putting to the computer from idle to full throttle. I learned this when I owned a 87 Grand National. Same theory applies here. A shop can do this and you'll want them to check the MAF, it could also be the problem. Do you know how to check engine trip codes on your car? Get a book for these as it will help you troubleshoot better. Also when the car starts too die at idle what happens if you feather the pedal to keep it running? Will it stay running smoothly, or does it sound like it's popping and misfiring? If you pedal it and it runs fine it's your TPS setting. If it pops and blows smoke and seems to misfire, your flooding it because your MAF is bad. Probably got banged up a bit and broke it. For what it's worth, your oxygen sensor does not come into play until the car has run for a few minutes and the motor has gone into a closed loop run mode where it starts to take input from the O2 sensor. All in all it sounds like the TPS to me.
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