Is there a difference between L-Jet brains |
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Is there a difference between L-Jet brains |
jd74914 |
Jan 24 2007, 10:12 AM
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#1
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Its alive Group: Members Posts: 4,796 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. |
ClayPerrine |
Jan 24 2007, 04:14 PM
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#2
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Life's been good to me so far..... Group: Admin Posts: 15,820 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille |
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. |
Brando |
Jan 24 2007, 04:19 PM
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#3
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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 |
[...] 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. |
ClayPerrine |
Jan 24 2007, 04:23 PM
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#4
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Life's been good to me so far..... Group: Admin Posts: 15,820 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille |
[...] 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. Heating element?? What heating element? This is a vane air meter, not a mass airflow sensor. |
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