LT1/LT4 Tech 1993-1997

93 Z28 **Rough** Idle

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  #1  
Old 10-31-2009, 02:33 PM
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Exclamation 93 Z28 **Rough** Idle

Hi everyone,
I've owned this car for 4 years, it was my very first camaro. When i first got it the SES light was on, and it kind of sputtered a little now and then. The tranny went on me at 123,000 miles, and i had it rebuilt. I drove it from illinois to alabama and back for the break in period. When I got back the exhaust busted weld right behind the cat. So i took it off, and havent put a new one on since. My problem is, the past few times ive drove it the idle is way rough. It can idle high, then jump real low and flutter in between(almost dies). When i try to drive it, it sputters and cuts out so bad You would wonder how it even runs. What could cause this problem? Sometimes it cuts out at higher rpms too, and sometimes it doesnt. I did find out about a year ago, that one of the lines from the charcoal canister is not hooked up to anything because I can tug on them where they go through the frame and hear them flopping around. Any ideas on where to start? I'm almost to the point of selling this because frankly it has become more of a money pit, than a decent ride!!! Any help would be greatly appreciated. Thanks so much
 
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Old 10-31-2009, 02:39 PM
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Is the SES light on now? With that many miles on it you may be getting into the worn out opti stage.
 
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Old 10-31-2009, 07:09 PM
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Hi,
The ses light isnt on now, but when I took it to the transmission guy I think he may have snipped the wire. After i got it back the light was off, and hasn't been on since.
 
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Old 10-31-2009, 07:39 PM
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scann it for trouble codes and see if anything comes up. he may have unhooked the battery which clears the codes and retained engine profile. u can use a paperclip to scann but a scanner will tell u more. i have gotten one code on mine flashing it and 8 with the scanner.
 
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Old 10-31-2009, 07:40 PM
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oh and whens the last time the car has had new spark plugs?
 
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Old 10-31-2009, 09:33 PM
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Originally Posted by craby
oh and whens the last time the car has had new spark plugs?

Mine ('93 Z28) acted up like that and just needed new plug wires,had new wires and plugs installed and she's run sweet ever since.
 
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Old 10-31-2009, 09:58 PM
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Hi,
I replaced all the plugs when I had to put new manifold gaskets on. I didn't get all the wire, because some I couldn't get too. Ill run the scanner again and see what it comes up with. I'll let you guys know when I scan it again what I come up with. Thanks for the input
 
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Old 10-31-2009, 10:07 PM
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yah the ones on the passenger side suck to do. did mine when i did the opti so all that stuff was out of the way. i think when the headers go in im going to switch to the multi coil setup and not use the dang opti cept for the cam and crank sensors.
 
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Old 11-03-2009, 02:35 AM
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If you replaced the manifold and routed one of the wires wrong it's more than possible you torched through one. Check them out, pretty cheap and easy (respectively) fix.
 
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