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Possible bad ecm i dont know

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Old Aug 27, 2018 | 12:25 PM
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Possible bad ecm i dont know

I just got the car about 2 weeks ago and it wont idle at normal rpm it idles at 1750-2k ive checked for vacuum leaks replaced iac and tps and adjusted both car fidnt have a cel so i decided to check the bulb it was blown i put a new one in it came on so tried to jump the aldl to pull codes and it doesnt work foes that mean its the ecm?
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Old Aug 27, 2018 | 12:28 PM
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Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Possible bad ecm i dont know

Sounds like a bad ecm.
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Old Aug 27, 2018 | 12:30 PM
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Re: Possible bad ecm i dont know

Thats what im thinking but the car runs great other than the idle and its a 305 tpi with a 165 ecm is that what its supposed to have?
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Old Aug 27, 2018 | 12:32 PM
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Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: Possible bad ecm i dont know

86-89 tpi uses the 1227165 ecm
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Old Aug 27, 2018 | 12:32 PM
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Re: Possible bad ecm i dont know

Also how can tell if it was the right prom
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Old Aug 27, 2018 | 12:35 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: Possible bad ecm i dont know

The memcal has 3-4 letters on it. If you post it I can identify what it’s for .
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Old Aug 27, 2018 | 12:49 PM
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Re: Possible bad ecm i dont know


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Old Aug 27, 2018 | 12:52 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: Possible bad ecm i dont know

Abun is from a 87 305 automatic with 2.73 rear gears
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Old Aug 27, 2018 | 12:58 PM
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Re: Possible bad ecm i dont know

Would 2.73 gears put me at 3500prm at 70?
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Old Aug 27, 2018 | 01:09 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: Possible bad ecm i dont know

Sounds like your math is off, not sure your tire height.
https://spicerparts.com/calculators/...rpm-calculator



Last edited by Tuned Performance; Aug 27, 2018 at 01:19 PM.
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Old Aug 27, 2018 | 07:35 PM
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Re: Possible bad ecm i dont know

Idk my gauge says above 3k and the engine is revving pretty high woukd torque converter lock up cause that is its not locking up? And what the easiest way to tell if the computer is trash
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Old Aug 28, 2018 | 03:22 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: Possible bad ecm i dont know

The higher rpm could be from the tcc not lockup up. The lack of communication from the ecm makes me think it’s faulty. The check engine light should be able to blink atleast a code 12.
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Old Aug 28, 2018 | 03:54 PM
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Re: Possible bad ecm i dont know

And the ecm controls tc lock up right
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Old Aug 28, 2018 | 03:59 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: Possible bad ecm i dont know

Yes the ecm does tcc lockup on pin a7 at the ecm tan/blk.
some aldl shave the splice for the tcc on pin f. A test light could be used to see if the solenoid is getting power.

Last edited by Tuned Performance; Aug 28, 2018 at 04:04 PM.
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