 Removing L-Jet ECU from plastic mounting cassette |
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| didenpx |
 Jul 15 2025, 04:59 PM
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#1
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Member  Group: Members Posts: 57 Joined: 1-September 23 From: Usa Member No.: 27,556 Region Association: North East States 
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Getting ready to drop an engine for the first time. Car is a 75 1.8 with stock FI.
I am stumped by the simplest of things; trying to remove the two 10mm bolts that hold the ecu into the plastic "cassette" that is mounted to the battery tray and chassis. I'm referring to the bolts that are above and below the wiring harness plug. The top one came out fine. The bottom one just spins and doesn't back out at all. I've tried getting a small screwdriver between the ECU mounting tab and the cassette to exert pressure on the bolt head while turning it, but no joy. FWIW, I also tried removing the bolts holding the cassette to the battery tray and had the same result; they spin and spin and don't back out. Is there a trick that others have used? Paul |
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Replies(1 - 5)
| wonkipop |
Jul 15 2025, 06:52 PM
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#2
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Advanced Member Group: Members Posts: 4,822 Joined: 6-May 20 From: north antarctica Member No.: 24,231 Region Association: NineFourteenerVille
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i dont recall having any problems when i took mine out 5 years ago.
perhaps someone prior has somehow cross threaded the bolts re-installing. from memory the cassette carrier is plastic and the bolts are going into a plastic thread. its been awhile and i would have to go down and have a look at mine. but i think that is how it goes. i know i got the ECU and carrier out first. then removed the ECU from the carrier to clean the contact plug area. |
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| bdstone914 |
Jul 15 2025, 11:20 PM
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#3
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bdstone914 Group: Members Posts: 5,043 Joined: 8-November 03 From: Riverside CA Member No.: 1,319 |
As I recall it is a brass insert in the plastic housing and it is spinning.
Just pull the harness from the ECU. Or grind off the head of the bolt. |
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| didenpx |
Jul 16 2025, 06:00 AM
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#4
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Member Group: Members Posts: 57 Joined: 1-September 23 From: Usa Member No.: 27,556 Region Association: North East States
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Thanks: these were helpful
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| ClayPerrine |
Jul 16 2025, 08:17 AM
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#5
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Life's been good to me so far..... Group: Admin Posts: 16,454 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille
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You can unbolt the ECU mount from the battery tray and the engine shelf. That will get it out.
After that, you just have to figure out how to hold the spinning insert in the plastic. |
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| didenpx |
Jul 16 2025, 08:35 AM
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#6
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Member Group: Members Posts: 57 Joined: 1-September 23 From: Usa Member No.: 27,556 Region Association: North East States
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QUOTE(ClayPerrine @ Jul 16 2025, 08:17 AM)  You can unbolt the ECU mount from the battery tray and the engine shelf. That will get it out. After that, you just have to figure out how to hold the spinning insert in the plastic. Thanks; I already tried that route and the inserts on the plastic holder where it attaches to the battery tray are doing the same thing....though they are easier to access than that one underneath the FI harness connector. I am going to try gently squeezing on the plastic where the insert is spinning and see if I can back the bolts out without destroying the plastic. |
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