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LT1-LT4 Modifications 1993-97 Gen II Small Block V8

I need a little help.

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Old May 26, 2010 | 10:41 AM
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Default I need a little help.
heres whats happening. theres no codes. its a 96 z28. before it stopped running it back fired out the tailpipe. and would only idle and rev up slow. but i would goose it and it would bog down and nearly die until i let off causing it to back fire like a stick of dynomite. i had spilt coolant on the opti from trying to perform the tb bypass and broke the plastic vacuum line. i repaired the line before starting. and i drove it a mile down the road after a mild burnout,then all hell started.i have replaced the icm and the opti. nothing has changed.

i tried to start it, all it would do is turn over and over. but when i let off the starter, its started to deisel a bit. it seemed like it would fire on one cylinder and spin a couple of times then fire on another. could a vacuum leak cause this or did my car jump time when i did the burnout.
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Old May 26, 2010 | 11:32 AM
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Looking at your sig i guessing you dont have cats ? if you do could be clogged up real bad or the coolant got in the opti
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Old May 26, 2010 | 11:46 AM
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the opiti i took off was dry but i replaced it anyways. i syliconed the opti cap and it works great. and no cats
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Old May 26, 2010 | 11:47 AM
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i do have it hypertech programmed.
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Old May 26, 2010 | 11:49 AM
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Originally Posted by z28camaro1996
the opiti i took off was dry but i replaced it anyways. i syliconed the opti cap and it works great. and no cats
I was going to say that your symptoms are tell-tale signs of an opti problem, but it looks like you figured that out already.
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Old May 26, 2010 | 11:54 AM
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i meant to say that even after replacing the opti its still not running
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Old May 26, 2010 | 11:57 AM
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did you replace the coil ?
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Old May 26, 2010 | 12:00 PM
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Originally Posted by z28camaro1996
i meant to say that even after replacing the opti its still not running
Did you open up the opti to check out inside? Your issues sound like a detached rotor.

EDIT: I reread what you typed...so you had the not running issue, so you replaced the opti and it's still not running?
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Old May 26, 2010 | 12:17 PM
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still not nunning and the old opti was just fine.
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Old May 26, 2010 | 12:18 PM
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i replaced the coil a couple of years back.
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Old May 26, 2010 | 01:04 PM
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i was checking out some of the vacuum lines and found that two of them are cracked really bad.
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Old May 26, 2010 | 01:19 PM
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i circled the hoses that were in horrible shape would this cause it not to run and back fire?
Last edited by z28camaro1996; May 29, 2010 at 04:18 PM.
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Old May 26, 2010 | 01:28 PM
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Those are your EVAP hoses. Replace them, but that won't prevent your car from starting.

Get a hold of a fuel pressure gauge and check your fuel pressure. If it's not the opti, the only thing I can think of is that your pump took a crap.
Also a new coil is cheap, won't hurt to try a new one.
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Old May 26, 2010 | 01:36 PM
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i checked my fuel pressure and it was at 43 at idle. i have my old coil that i took off and nothing was wrong with it i may try it tonight.
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Old May 26, 2010 | 01:54 PM
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Did you check your plugs and wires ?
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Old May 26, 2010 | 01:56 PM
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no. i had them on there for about 60000 miles and they're the ac delco platinums.
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Old May 26, 2010 | 02:00 PM
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I would check your wires and plugs try starting it in the dark and see if you see any sparking under the hood, If you see arching in the wires then that is your problem
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Old May 26, 2010 | 03:21 PM
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does the car come stock with timing chain or gear drives?
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Old May 26, 2010 | 03:22 PM
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Originally Posted by z28camaro1996
does the car come stock with timing chain or gear drives?
Timing chain.
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Old May 26, 2010 | 04:04 PM
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Originally Posted by ss.slp.ls1
Timing chain.
i bet my timing jumped time then.
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