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No start 91 camaro 305 with 5 speed

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Old Dec 23, 2019 | 12:08 PM
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Jonathan Henson's Avatar
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No start 91 camaro 305 with 5 speed

Ok, so I replaced fuel pump, rebuilt throttle body and replaced fuel pressure regulator, replaced fuel filter, and can get fuel injectors to cycle when out of car by doing it by hand with 12 volt battery, underneath dash, by fuse box, there is a yellow wire and a black wire hanging down and not connected to anything at their ends, did not trace them back yet. Don't know if this used to be or was the last owner bypassing vats or not, or not related to vats at all. Car does not start, can start if fed gas by hand. Car used to start a while back, and sat for only a few days maybe at most, went to start, and would just crank. Any help greatly welcome, searched these forums for a few months but being a junior in high school I dont have much time to go out and put in hours on the car too often. Also, security light does go on for a second or two, then turns off, I have heard this is what should happen.

Last edited by Jonathan Henson; Dec 23, 2019 at 12:11 PM.
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Old Dec 23, 2019 | 12:22 PM
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Tuned Performance's Avatar
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Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: No start 91 camaro 305 with 5 speed

Check pin b6 at the ecm for voltage from the passkey module.
If it’s working you will get 2.5-5v. Another quick way to see if it’s vats is to remove the ecms prom. I will fire up in limp home mode if it’s a vats issue.
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Old Dec 23, 2019 | 04:51 PM
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Re: No start 91 camaro 305 with 5 speed

Originally Posted by Tuned Performance
Check pin b6 at the ecm for voltage from the passkey module.
If it’s working you will get 2.5-5v. Another quick way to see if it’s vats is to remove the ecms prom. I will fire up in limp home mode if it’s a vats issue.
can you send a picture? Thanks!
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Old Dec 23, 2019 | 11:10 PM
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From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: No start 91 camaro 305 with 5 speed

Send a picture of what ?
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Old Dec 24, 2019 | 06:11 PM
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Re: No start 91 camaro 305 with 5 speed

A pic of where the b6 pin is located and where the connection is found, thanks
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Old Dec 24, 2019 | 06:21 PM
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From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: No start 91 camaro 305 with 5 speed

The ecm is believed the passengers side dash speaker.
accessible from under the dash.

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Old Dec 26, 2019 | 06:22 PM
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Re: No start 91 camaro 305 with 5 speed

Ok thanks so much sucks though that I'm on vacation right now so wont be able to test this till at least the 30th of this month
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