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

another lt1 no start

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Old May 4, 2015 | 04:26 AM
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Default another lt1 no start

So my friend bought a 95 z28. Car didnt start when he bought it, it would turn over good but never fire. We got it home and sprayed ether in it. Fired up and idled high. Once u get it running you can cut it off and on a few times and itll start fine. Once it sits it will not start back without ether. Now the car wont start with ether.

Things we have tried are, engine harness, spark plugs and wires, opti, coil, vats removed, and a tps sensor. We even switched cpus with one from a 94.

We rented noid lights, and the injectors were grounded. The noid light didnt blink.

We took the injectors off of my car cause they were the same stock size and put on his.

We know mine work.

Any ideas?
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Old May 5, 2015 | 08:46 PM
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How long was it sitting for before your friend bought it?
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Old May 6, 2015 | 05:35 AM
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Atleast 4-5 months. We got it running with ether and drove it. Now it wont start with ether.
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Old May 6, 2015 | 05:58 PM
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Did you check if fuel pump and fuel pump relay is ok?
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Old May 7, 2015 | 05:17 AM
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We checked the pressure. Had 45 and never went down. We think its going bad though its getting real quiet
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Old May 7, 2015 | 06:55 PM
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Yeah,
If, you get chance might want to check the pin-out on fuel pump harness connector at the back above the rear end, Ive seen them burned up badly.
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Old May 7, 2015 | 07:30 PM
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did you check/replace the icm?? those have been known to go bad without warning
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Old May 8, 2015 | 11:12 AM
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I'll chime in.

1.pcm was swapped with wct13's that we know works and has VATS delete and a tune, no change.

2.Changed icm/coil, no change

3.New spark plugs and wires. No change

4.New opti, no change

5.New wiring harness, just cause it had several missing pigtails, no change

6.Had the pcm in the car tuned, VATS delete, egr delete. No change

7.Pcm shows no trouble codes

8.New tPS sensor

9.fuel pump works because it held pressure at the rails at around 47-48 for quite awhile

10.It is getting fuel and spark because the car started with a shot of ether, and I drove it up the road And ran it up to about 6k rpm and smoked the tires, it ran great then, , had great power. and shut down and fired up repeatedly afterwards. The next day. No fire

11.Replaced injectors, no change

12. I did put noid lights on the injector pigtails, and got nothing, then we fired the car up with either and drove it right after that (refer to #10)

Now it will just turn over, and not fire period.


There is nothing left to replace, or test, the Damn thing just won't fire. And we're out of ideas
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Old May 8, 2015 | 12:08 PM
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did you check the fuses? i had a problem where a pinched wire grounded to the frame and blew the ignition fuse.
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Old May 8, 2015 | 02:05 PM
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Check the coolant temp sensor resistance to see if it's in range or replace it. It's the one in the WP. The pcm uses it for cold engine fueling, on a carbed engine it would be the choke.
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Old May 8, 2015 | 05:32 PM
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Originally Posted by Cajun ELESS-ONE
did you check the fuses? i had a problem where a pinched wire grounded to the frame and blew the ignition fuse.
Checked all fuses and relays, relplaced what needed replacing, and checked every ground wire known.

Originally Posted by guppymech
Check the coolant temp sensor resistance to see if it's in range or replace it. It's the one in the WP. The pcm uses it for cold engine fueling, on a carbed engine it would be the choke.
Ok, but do you got a "how to"? Or I could go check shbox.com
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Old May 8, 2015 | 08:04 PM
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Here's that shbox link to test the sensor

http://shbox.com/1/4th_gen_tech2.html#ect
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