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

HELP! Car wont start

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Old Dec 12, 2012 | 02:15 PM
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Angry HELP! Car wont start

I know that there are alot of posts about this topic,but i still cant figure this out. Changed spark plugs and wires, an A.I.R. delete, custom intake manifold, and a gasket leak on the passenger side exhaust manifold. Everything is replaced and its finally time to fire it up. But to no avail. Turn the key and can hear the fuel pump running, attempt to start the car, but it wont. it just keeps cranking, but wont start. I have spark, fuel, and air and just cant figure out why it wont turn over. been puzzled for about two days and about to start pulling out hair,

Plz help as this is my daily driver(only means of transportation)

car is a 94z28 a4
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Old Dec 12, 2012 | 02:21 PM
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So uhhhh.. what kinda car?
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Old Dec 12, 2012 | 02:26 PM
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you have spark from both coil and at plugs? all grounds hooked back up? made sure youhave 40ish psi at the rail? triple check wire order and make sure you didnt mix them up? does the custom intake have iac passages? No fuses blown?

im just throwing out ideas for you to check, on my phone so can only post so much lol
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Old Dec 12, 2012 | 02:34 PM
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everything checks out.... no start
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Old Dec 12, 2012 | 03:01 PM
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I am actually doing all the work to help out my friend. I rechecked everything I touched (wires&plugs basically ). The 94 Z is just turning over ....no start condition. I do have spark but doesnt seem to be jumping/arcing out much (Opti/coil/module/grounding issues). The intake has been replaced due to cracking/broken seals. MAF in correct position and connected. Gonna check fuel pressure but just have to wait till I get back my gauge from a friend who borrowed it ....not answer his fukn phone!! Still testing all possibilities. LT-1's are such a pain!!! hehehe...
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Old Dec 12, 2012 | 03:13 PM
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lt1 not lt-1, the lt-1 is a motor from the 70s
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Old Dec 12, 2012 | 03:17 PM
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"Check Engine" light not on with key in the "on" position, no start!! Definitely a wiring/grounding/fuseable link issue here......ugh!
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Old Dec 12, 2012 | 03:18 PM
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Originally Posted by ZFreie
lt1 not lt-1, the lt-1 is a motor from the 70s
I'd have it started already if it was the first gen LT-1's....
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Old Dec 12, 2012 | 03:47 PM
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Fuel pump stays on with ignition in the start position. Also, wiring is from 95 Z28 and not the original wiring for the 94.
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Old Dec 12, 2012 | 04:37 PM
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Im not going to say its the PCM, but there is a possibility it could be rare chance. Before messing with it i would be sure its not any of the other issues.

Just cause you have fuel pressure doenst mean its enough, so make sure to check with a gauge.

Originally Posted by RamAir95TA
GM spec is 41-47psi with the key on, engine off. At idle, pressure should drop 3 to 10psi and slowly increase with throttle position.

Last edited by LT1; Dec 12, 2012 at 05:01 PM.
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Old Dec 12, 2012 | 05:12 PM
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Im smelling alot of fuel. I know he is getting it but just gonna have to get one to test. Its electrical...fans kick on, then they dont when starting! Testing me for sure....
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Old Dec 12, 2012 | 06:25 PM
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I hate to tell you but if you have spark, fuel, and air it would be running.... you are getting a false positive on one of your test for spark, fuel, and air.
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Old Dec 12, 2012 | 06:33 PM
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Originally Posted by nitrous2fast
I hate to tell you but if you have spark, fuel, and air it would be running.... you are getting a false positive on one of your test for spark, fuel, and air.
"Had" spark!!! Not sparking now...module tests good, coil leaking really bad! Replacing after I eat my sandwich!!
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Old Dec 12, 2012 | 06:34 PM
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Swear this Z has a mind of its own. Fans kick on/off when it wants....but hoping the coil issue will resolve this all. Opti is all that is left that can only be the answer, once coil is in.
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Old Dec 12, 2012 | 09:02 PM
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Good news, it ended up being the coil. I cant stress how much I appreciate your help. Lord knows I didnt want to buy an opti right now
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Old Dec 12, 2012 | 11:13 PM
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Thank God!! But, now I gotta get started on that Fiero head job... suks BTW, rebuilding process started on your throttlebody! Idle stuck at 2000 now and throttlebody armature not even close to throttle stop screw....but no problem! It will be waiting for you buddy.

Last edited by Uwilllosetomy93lt1; Dec 12, 2012 at 11:24 PM.
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