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Why does the correct ecu make my car run worse!!!!! 

 

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 Post subject: Why does the correct ecu make my car run worse!!!!!
Posted: Sat Apr 29, 2006 12:00 am 
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Finally turfed out the 3.9 ecu that was running my ED XR donk and put it the original XR puppy... now it runs like s**t!!!! poping and constantly groaning out the air box... the injectors are louder.... and it has a miss and a flat spot!!!!
help!!!!! i have changed the fuel reg's over... that helped slightly.... but still runs like s**t compared to the 3.9 ecu i've had in there for 6 months....

any suggestions???

thanks guys

 

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Posted: Sat Apr 29, 2006 12:38 am 
Getting Side Ways
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why was it running the 3.9 ECU?

is the ED XR6 engine in an ED or EA?

 

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Posted: Sat Apr 29, 2006 1:48 am 
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Have you given it time to relearn. Heck it took my ECU weeks to learn the new cam.

 

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Posted: Sat Apr 29, 2006 2:30 am 
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yeah give it time to learn the new stuff. since it wasnt used in ur car before its gotta repeat the process of correcting idle speed and stuff.

phong =P~

 

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Posted: Sat Apr 29, 2006 12:11 pm 
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yeah but it usually doesnt run that bad......

maybe the ecu is stuffed...
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Posted: Sat Apr 29, 2006 5:40 pm 
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Yeah it runs REALLY bad... not like just taking the battery of for a few hours.....

It had a 3.9 ECU coz thats what i had to run before i got my smartlock by-pass.... the motor is in a ser1 EB..... hence the 3.9ECU

AHHH HELP!!!!! :(

 

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Posted: Sat Apr 29, 2006 6:22 pm 
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I got 3 codes out of the xr ecu... CTS, ISC and o2 sensor....
I think they are 3.9 items. ( I only swapped blocks-not manifolds) would that be casuing a problem?

 

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Posted: Thu May 04, 2006 7:58 pm 
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Turn's out its not an XR ECU its a 3.9 CFi ECU. doh!

Now i need to make use of a smarltokc by-pass i bought. would an EL ECU be any benifit?

 

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Posted: Thu May 04, 2006 8:03 pm 
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LOL dude, check your part numbers. An ED XR6 one should say 92DT.

 

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Posted: Thu May 04, 2006 8:05 pm 
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havent done it myself but have heard of it workin.

 

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Posted: Thu May 04, 2006 8:14 pm 
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sorry just posted something of interest to this conversation in forum instead in here

Titled "Resetting your ECU"

 

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