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post #1 of 8 (permalink) Old 05-29-2008, 12:34 AM Thread Starter
 
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HELP! Idle Issue!

Hey there I am working on my mother-in-laws 92 Acura Vigor and I am stumped. When sitting at idle the car seems to miss every once and a while sometimes more often the not. The idle drops then it picks back up again. However when in gear ( it is an Automatic) the idle drops too far and the engine light comes on putting the car into safe mode I think because it wont go higher then 2800 rpm. I thought maybe it was a fuel fikter or injector problem but after running injector cleaner and replaceing the filter it is still doing it. Is there any way to check the computer for the sensor codes?

Edit: I thought I would add that even when the car is in gear the motor misses but the light wont come on until you try to give it fuel then the idle drops to about 500-600 rpm followed by the check engine light .
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post #2 of 8 (permalink) Old 05-29-2008, 01:09 AM
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thats way to serious for a cloggled injector or filter.

It sounds like a timing problem

Did you replace the timing belt? It sounds like offtiming between the exhaust and intake cams.

If its vtec or equivalent the cams are spring loaded so you need to check the motor at TDC (top dead center) im not sure of the vehicle, is it a v6 or I4?

I know the spring loaded cams can have issues if you dont lock the cams correctly.

That is either a bad piston not firing so spark plug cables or the timing problem. You need to tell us what "work" you are doing on the car.

CM

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post #3 of 8 (permalink) Old 05-29-2008, 01:15 AM
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A 92 would be OBD I; and I dont believe there is a way to pull the codes without a scan tool. Could be anything from a crankshaft sensor to just needing a tune up from the way it sounds. Ive seen them do that with bad throttle position sensors too. See if you can get a trouble code out of it.
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post #4 of 8 (permalink) Old 05-29-2008, 03:52 AM Thread Starter
 
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I can't seem to be able to find were the cable coneccts any where for the computer and as for the work I am doing to it, this is it I am trying to fix it for my mother in law.
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post #5 of 8 (permalink) Old 05-29-2008, 04:49 AM
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Quote:
Originally Posted by spltshft View Post
I can't seem to be able to find were the cable coneccts any where for the computer and as for the work I am doing to it, this is it I am trying to fix it for my mother in law.
Its a weird plug, I believe its under the hood somewhere on the passenger fender well. Its not a regular OBD 1 plug.
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post #6 of 8 (permalink) Old 05-29-2008, 11:57 AM Thread Starter
 
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I found some info online. there is a two wire plug under the dash on the passenger side that when jumped it will give you the error codes I got four flashes which means (acording to the web site) Crankshaft position sensor. So I am starting to think that the timming belt jumped a tooth. I am not sure how hard it would be to fix because I have never worked on one of these inline 5's
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post #7 of 8 (permalink) Old 05-29-2008, 04:23 PM
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can't it not be the crankposition sensor that died? If that sensor is intermettenly doing this, you will get misfires, bad idles and many other stuff...

of course if the timing is off, you have the same issues.
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post #8 of 8 (permalink) Old 05-29-2008, 08:32 PM Thread Starter
 
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Yea I am going to start with the sensor then move to other things. I also found out that they have Timeing chains and not belts so it didn't jump a tooth. Also if the timing was out I think it would be constantly miss firing not sporatically.
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