93 LT1 backfiring and missing
Thread Starter
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In the Staging Lanes
Joined: Aug 2011
Posts: 36
From: Mayflower, AR
93 LT1 backfiring and missing
My 93 LT1 started backfiring and missing some this morning on my way to work (75 mile commute). It would straighten out and then start up again.
It got to the point of any small incline would make it cow down and start missing and backfiring in overdrive. I could put it in Drive and it would run
better but still miss a little. It quit on me at a stop light and won't start now. Turns over but pops and sputters and eventually backfires. Acts like it
wants to start but won't. Any thoughts?
Thanks.
It got to the point of any small incline would make it cow down and start missing and backfiring in overdrive. I could put it in Drive and it would run
better but still miss a little. It quit on me at a stop light and won't start now. Turns over but pops and sputters and eventually backfires. Acts like it
wants to start but won't. Any thoughts?
Thanks.
4th Gear Member
Joined: Sep 2006
Posts: 1,950
From: Yacolt,WA
Could be fuel pump related or a few other things but the most common problem is the Optispark distributer , especially on the early LT1's with the non vented Opti.
I had a '93 and replaced it twice, should have gone with the GM Performance first time but my mechanic talked me into a World products brand.
It failed 10K later and out of warranty, if you buy a new Opti get the GM Performance unit.
I had a '93 and replaced it twice, should have gone with the GM Performance first time but my mechanic talked me into a World products brand.
It failed 10K later and out of warranty, if you buy a new Opti get the GM Performance unit.
Thread Starter
|
In the Staging Lanes
Joined: Aug 2011
Posts: 36
From: Mayflower, AR
I am hoping that's what it is and not timing related. My SES light has been on for a long time now. I have around 280,000 miles on the car and it's a daily driver. Is there any hope with going with a cheaper optispark? I don't have the $400 to spend right now for it and would like to replace the spark plug wires and water pump while I'm in there.
4th Gear Member
Joined: Sep 2006
Posts: 1,950
From: Yacolt,WA
I am hoping that's what it is and not timing related. My SES light has been on for a long time now. I have around 280,000 miles on the car and it's a daily driver. Is there any hope with going with a cheaper optispark? I don't have the $400 to spend right now for it and would like to replace the spark plug wires and water pump while I'm in there.
Thread Starter
|
In the Staging Lanes
Joined: Aug 2011
Posts: 36
From: Mayflower, AR
I have an Opti, Water Pump and Spark plugs and plug wires ordered to be here by this weekend. Is there anything else that's not too expensive that I should look at replacing while I've got it torn apart?
4th Gear Member
Joined: Sep 2006
Posts: 1,950
From: Yacolt,WA
https://www.michiganmotorsports.com/...iABEgIV0vD_BwE
Last edited by Y2K; Nov 6, 2018 at 07:15 PM.
April 2011 ROTM
Joined: Mar 2009
Posts: 22,016
From: Tokeland, Washington
ROTM Winner's Club
nice place for info, shbox is good. 4th Gen LT1 F-Body Tech Aids
here is shows how to flash codes http://shbox.com/1/dlc2.jpg
here is shows how to flash codes http://shbox.com/1/dlc2.jpg
April 2011 ROTM
Joined: Mar 2009
Posts: 22,016
From: Tokeland, Washington
ROTM Winner's Club
more info https://camaroforums.com/forum/93-02...62/#post557634
factory service manual download here http://www.mediafire.com/?40mfgeoe4ctti i prefer the paper version, the 93 edition is not that costly.
factory service manual download here http://www.mediafire.com/?40mfgeoe4ctti i prefer the paper version, the 93 edition is not that costly.