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LTX and LSX Putting LT1s, LS1s, and their variants into Third Gens is becoming more popular. This board is for those who are doing and have done the swaps so they can discuss all of their technical aspects including repairs, swap info, and performance upgrades.

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Old 04-18-2011, 04:14 PM   #1
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Car: 1981 Camaro; 1986 Z28
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ignition control module?

So after replacing the optispark, I am getting the same problems I was having before. I've got a nasty sputter and the car stumbles and hesitates really bad when I mash the throttle. I have replaced the Opti, the coil, and now the module. However, with the new module, the car wouldn't even start, so I put the old one back and it started but ran like crap. I had the old module tested at two different placed and they both said it was bad. I had the new one tested and it was supposedly bad too. I have bought a third one and asked them to test it before I took it home and it failed too. I can understand one being bad out of the box but two! That seems a little rediculous. Has anybody else had this issue. I don't mind buying several different modules since I can return them as defective but I will eventually run out of options.
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Old 04-18-2011, 06:51 PM   #2
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Re: ignition control module?

Rockauto shows the same ign ctrl mod for alot of vehicles. If the catalog is to be trusted, you can grab one from a mid-late 90's S10 or other vortec 4.3L which litter JYs

ACDELCO Part # D579 {#10482803} 4 PIN
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Old 04-18-2011, 08:30 PM   #3
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Re: ignition control module?

Well I just installed the second brand new module and it doesn't even attempt to fire. But, when I put the old one back it starts. What the hell!!!
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Old 04-18-2011, 08:41 PM   #4
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Re: ignition control module?

What do you guys think of the cts being bad? I know these won't set a code but they will cause havoc with the engine. This still doesn't explain why the car won't start with two supposed new modules.
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Old 04-18-2011, 08:56 PM   #5
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Re: ignition control module?

Hook a scanner up and monitor the CTS in real-time. A bad CTS will have a fixed value
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Old 04-20-2011, 06:59 PM   #6
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Re: ignition control module?

I got it figured out. After putting on a known good module and the car still not starting, I put the original back on the car and ran my scanner with the engine trying to run. All the numbers looked good so I was stumped. A buddy of mine let me borrow his MAF and that fixed the problem. I don't know why it never threw a code but now it idles like it should and has that beautiful crisp throttle response. I still don't know why three other control modules wouldn't even start the car but at least I got it figure out. I also noticed my left and right fuel trim it at 160 and I'm pretty sure it should be at 128. I am assuming this is becuase I put bigger injectors and haven't reprogrammed the computer yet. Does this sound right?
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Old 08-21-2011, 08:01 PM   #7
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Re: ignition control module?

ok so i am thinking my ICM went bad. i went out to dinner with the wife and her friend, came out and cranks but i have no fuel to the tbi or spark. any suggestions?
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Old 08-21-2011, 08:49 PM   #8
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Re: ignition control module?

Quote:
Originally Posted by clean92rs View Post
ok so i am thinking my ICM went bad. i went out to dinner with the wife and her friend, came out and cranks but i have no fuel to the tbi or spark. any suggestions?
I wouldn't think that the ICM would be causing the lack of fuel issue.
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Old 08-21-2011, 08:49 PM
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