 Is there a difference between L-Jet brains |
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| jd74914 |
 Jan 24 2007, 10:12 AM
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Its alive  Group: Members Posts: 4,782 Joined: 16-February 04 From: CT Member No.: 1,659 Region Association: North East States  |
My brain seems to be toast, and I'm looking at buying a spare known good one to swap in to test out this theory. I have a 74 1.8L with L-Jet; can I use a '75 brain? Are there any important differences between the 2 years?
Thanks. |
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| ClayPerrine |
Jan 24 2007, 04:14 PM
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Life's been good to me so far..... Group: Admin Posts: 15,541 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille 
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The differences in the L-Jet systems were all in the air flow meter and the wiring harness. The "brains" are identical.
In 74, they used a common wire for both the AFM and Air Temp sensor that is co-located in the AFM assembly. In 75, they split out the wiring, separating the AFM and Temp sensor. Seems there was some feedback issues with the common wire. I have never seen one of these "brains" fail, its usually something else causing it. |
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| Brando |
Jan 24 2007, 04:19 PM
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BUY MY SPARE KIDNEY!!! Group: Members Posts: 3,935 Joined: 29-August 04 From: Santa Ana, CA Member No.: 2,648 Region Association: Southern California |
QUOTE(ClayPerrine @ Jan 24 2007, 02:14 PM)  [...] I have never seen one of these "brains" fail, its usually something else causing it. Usually it's the heating element inside the Air Flow Sensor. The only reason you would need a new ECU is if the one in question has been opened (exposed to the elements and is corroded or broken) or has been physically damaged due to impact or some other trauma. 1.8L L-Jet ECUs are interchangeable. |
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Posts in this topic
jd74914 Is there a difference between L-Jet brains Jan 24 2007, 10:12 AM
SLITS According to Bosch, the brain is the same from 11/... Jan 24 2007, 02:10 PM
Jeff Bowlsby I don't have access to my references here at w... Jan 24 2007, 02:19 PM jim_hoyland Don't know the answer; but I do have spare 6 a... Jan 24 2007, 08:26 PM ClayPerrine
[...] I have never seen one of these "brain... Jan 24 2007, 04:23 PM SLITS Ok, I had included in the post but erased it that ... Jan 24 2007, 04:26 PM Brando MY MISTAKE, was confused for a moment. There's... Jan 24 2007, 04:28 PM jd74914 I know my box has been opened by the PO, and had e... Jan 24 2007, 06:00 PM Dave_Darling The injector pulses come off the coil--the same co... Jan 24 2007, 08:08 PM |
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