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bigjohn
User
Jan 21, 2012, 4:00 PM
Post #1 of 7
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OK to install used CM ?
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1995
Mercury
Grand Marquis
4.6 engine
137,000
I've had my car into the dealer and they feel the reason it wont idle and stall when cold is the PCM/ ECM, replacement cost of this is approx. $400 and like the IAC before it it's mine weather it fix's the problem or not. My first question is there any problem with using a used ECM and installing it myself?
my second question is: I've found the ECM in the firewall below and to the right of the master cylinder but if anyone can tell me after removing the two nuts and the electrical connection does it slide out forward into the engine compartment or must it be removed from under the dash?
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Hammer Time
Ultimate Carjunky
/ Moderator
Jan 21, 2012, 4:31 PM
Post #2 of 7
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Re: OK to install used CM ?
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No, you can't put a used PCM in there. This car is OBD2 and the PCM is programmed for that vehicle, including the VIN number.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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bigjohn
User
Jan 21, 2012, 9:56 PM
Post #3 of 7
(1497 views)
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Re: OK to install used CM ?
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Can I have the used one reprogrammed?
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Hammer Time
Ultimate Carjunky
/ Moderator
Jan 22, 2012, 6:32 AM
Post #4 of 7
(1489 views)
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Re: OK to install used CM ?
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Possible but I really wouldn't advise it. Used modules is real risky business.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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nickwarner
Veteran
/ Moderator
Jan 22, 2012, 11:50 AM
Post #5 of 7
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Re: OK to install used CM ?
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Agree with HT on no used modules. The policy of every boneyard I know is no returns on electrical parts once installed. That, however is the only way to find out if you got a bad one AFTER you've also paid a dealership to flash it and program it to your VIN. If you're shelling out that much money it would only make sense to buy a new one with a guarantee on it than chance swapping bad parts for bad parts and being at square one. They don't call it a junkyard for nothing after all.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jan 22, 2012, 11:53 AM
Post #6 of 7
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Re: OK to install used CM ?
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Electrical components really don't like sitting outside exposed to the elements for years before you buy them.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Discretesignals
Ultimate Carjunky
/ Moderator
Jan 22, 2012, 12:00 PM
Post #7 of 7
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Re: OK to install used CM ?
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Your better off getting a reman PCM and using yours as a core. The companies that reman have the ability to flash them. All you do is plug and play.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Jan 22, 2012, 12:00 PM)
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