How common is it for PROMs to go bad?
Thread Starter
On Probation
Joined: Apr 2017
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From: Holly Spring NC
Car: 1987 IROC-Z Camaro
Engine: 305 TPI
Transmission: T-5 5 Speed
How common is it for PROMs to go bad?
Hey guys...I read up on PROMs a little bit on a old post on here...really old...so I didnt comment on that one...but is it rare for a PROM to go bad...and or also...do they reproduce these...or do you just get a new ECM is what its called?
Also what is this "PROM burning" I hear of?
Also what is this "PROM burning" I hear of?
Joined: Dec 2004
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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: How common is it for PROMs to go bad?
It's not very common for a factory prom to go bad. Over time they can flip a bit and have bad data.
You can reprogram the factory prom or Reburn the data or new data.
A error code 51 is usually a bad ecm not memcal.
You can reprogram the factory prom or Reburn the data or new data.
A error code 51 is usually a bad ecm not memcal.
Thread Starter
On Probation
Joined: Apr 2017
Posts: 353
Likes: 0
From: Holly Spring NC
Car: 1987 IROC-Z Camaro
Engine: 305 TPI
Transmission: T-5 5 Speed
Re: How common is it for PROMs to go bad?
Ahhhh..gotcha what's the process of reburning one??? Sounds kinda hard...
Joined: Dec 2004
Posts: 16,926
Likes: 1,016
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: How common is it for PROMs to go bad?
Most people use moates.net burn 2 but this is a breakdown of what's involved.
https://www.thirdgen.org/forums/diy-...uide-book.html
https://www.thirdgen.org/forums/diy-...uide-book.html
Joined: Mar 2006
Posts: 4,370
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Car: 1973 Datsun 240Z/ 1985 S-15 Jimmy
Engine: Turbo LX9/To be decided
Transmission: 5-speed/T-5
Axle/Gears: R200 3.90/7.5" 3.73
Re: How common is it for PROMs to go bad?
Granted a failed ECM could cause a code 51, if the right circuits failed. But to say that a code 51 means bad ECM and not PROM is quite misleading.
You can test this by simply removing the PROM ot forget to disable checksum while emulating... and you will get a code 51 with a perfectly functioning ECM.
Last edited by Six_Shooter; Aug 28, 2017 at 09:21 AM.