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Troubleshooting Diagnosing problems done here.

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post #1 of 9 (permalink) Old Mar 6th, 03, 05:24 PM Thread Starter
Join Date: Mar 2003
Location: Chicago, IL
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Hey guys, please give me a hand if you can. I'm not familiar with Camaros, so bear with me. My brother has a 92 RS with the 302 TBI engine. He's not too mechanical, and called me in to help him out.

When starting, the engine fires right away. Revs up to 1500 and them goes to settle to idle. Right there (engine has only been running for 2 or 3 seconds at this point), it starts to "chug", almost like only half the engine is running. If I press the accelerator, half the time it just dies out, the rest of the time the RPMs will go up, but very slowly and roughly, still chugging. The exhaust stinks like it's running rich, and thanks to a fresh snow, I can see that black soot is coming out.

Looking at the engine, all the obvious things are right. No obvious vacuum leaks; all connectors are tight; wires, cap and rotor are not brand new, but still servicable looking.

This problem came up suddenly- one day it worked, next day it didn't. What's got me confused is that the engine runs OK for those few seconds. I'm guessing that some sensor or something has taken a crap, that the computer doesn't pay attention too for the first few seconds. But maybe I'm going down the wrong path...?
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post #2 of 9 (permalink) Old Mar 7th, 03, 02:05 PM
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Location: Austin, TX, USA
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Sounds like something is causing misfire. Have any plug wires been swapped. Acutally it sounds more like feul loading causing a weak plug or ignition circuit not to fire. I'd pull the plugs and see if any of them are wet and sooty. Might also do an inspection with the engine running in the dark to look for sparklies. A wooden stick comes in handy to fuss around with the wires so you don't get your shoes blown off.

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post #3 of 9 (permalink) Old Mar 7th, 03, 02:37 PM
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Try replacing the MAP sensor.

Without properly scanning it, it's an easy, cheap test.

Don ~ TC Member #15 ~
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post #4 of 9 (permalink) Old Mar 8th, 03, 09:02 AM
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make sure all the plug wires are snapped onto both the cap and plug, and double check that they go to the right plugs. numbers 5&7 (the back two on the driver's side) fire one after the other, and are easy to mix up. pull the cap off and see how everything looks. check the plugs, as already stated. look for any loose/missing vacuum hoses. essentially, look for anything out of the ordinary. start it without an air cleaner on it, and watch how the fuel comes out of the injector- it should be pretty much invisible to the naked eye.

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post #5 of 9 (permalink) Old Mar 15th, 03, 11:04 PM
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Those 2-3 seconds at start up. Isn't it seposed to be like 10-15 seconds. Ask him if there was a change in higher rev warm up. It might be the fuel pump.
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post #6 of 9 (permalink) Old Mar 16th, 03, 07:09 AM
David Pozzi
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Put a new fuel filter on it. Might not be the problem, but just to be sure before looking elsewhere...


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post #7 of 9 (permalink) Old Mar 16th, 03, 06:09 PM
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Matt Jones
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I think it's a fuel problem.

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post #8 of 9 (permalink) Old Mar 16th, 03, 08:34 PM
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Hey don't forget to pay all of us the $100 diagnostic fee with state taxes if applicable. Ya R&R the fuel filters first. Do an injector cleaner bottle also. Good luck.
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post #9 of 9 (permalink) Old Mar 21st, 03, 04:26 AM
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Does it get any better when the engine warms up or is it like that all the time?

Need a little more info to help troubleshoot.
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