Do I Need a New Prom?
Thread Starter
Safety Car
Joined: Feb 2002
Posts: 4,212
Likes: 10
From: Sun City West Az
Do I Need a New Prom?
Hey Guys,
My buddy has a 1993 LT-1 Auto. KOEO (enging stone cold) both fans start up but the car won't start. Key off then back to 'on' fans not running and engine starts. We chased the rest of the fan system and it is in good working order, relays etc. So put his prom into another ECM and it does the same thing. We are now thinking a bad prom.
Can his be reflashed? If not, where can we get another one?? Any ideas?
Thanks
My buddy has a 1993 LT-1 Auto. KOEO (enging stone cold) both fans start up but the car won't start. Key off then back to 'on' fans not running and engine starts. We chased the rest of the fan system and it is in good working order, relays etc. So put his prom into another ECM and it does the same thing. We are now thinking a bad prom.
Can his be reflashed? If not, where can we get another one?? Any ideas?
Thanks
Burning Brakes
Joined: Aug 2006
Posts: 878
Likes: 2
From: BC
If your using a stock prom and it is causing a problem then the only way around it would be to replace it. I'm no expert when it comes to the LT1 ECM's though.
Have you read the ECM for any error codes. I beleive code 52 (from memory) is Prom Error.
Have you read the ECM for any error codes. I beleive code 52 (from memory) is Prom Error.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
It could if you can find someone with the the right equipment to erase and reprogram ( was old skool way )
Current way is to install EEPROM on a custom adapter
Online tuners like PCMforless and other will do a stock tune or any mods you want, like VATS delete , lower fan temps , etc
http://www.pcmforless.com/index.php?...per&Itemid=316
92-93 LT1 have same style removable memcal as the earlier ECM's.
94+ have the sealed alum case version with internal memory that can be re-flashed
Current way is to install EEPROM on a custom adapter
Online tuners like PCMforless and other will do a stock tune or any mods you want, like VATS delete , lower fan temps , etc
http://www.pcmforless.com/index.php?...per&Itemid=316
92-93 LT1 have same style removable memcal as the earlier ECM's.
94+ have the sealed alum case version with internal memory that can be re-flashed
Last edited by rodj; Nov 8, 2011 at 07:08 AM.
Instructor
Joined: Jan 2003
Posts: 165
Likes: 0
From: Marianna FL
sounds like on first turn of the key the ecm and i think its called the ccm are not seeing each other. if the digital gages read lo when the fans r running and no start this could be the problem. could be as simple as a bad ground on the ccm. dunno. good luck
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Thread Starter
Safety Car
Joined: Feb 2002
Posts: 4,212
Likes: 10
From: Sun City West Az
Up date.....it turned out to be a bad ECM. Since we couldn't locate a known good replacment, we put in a stand alone aftermarket unit for the fans bypassing the ECM completely.
