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86.5 - early 1987 cars, thermal lockout?

 
Old 02-18-2019, 06:55 PM
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Shark2626
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Default 86.5 - early 1987 cars, thermal lockout?

Regarding a pair of exhaust temperature sensors on ‘88 and onwards cars that shuts down half of the cylinders if the left and right hand cylinder bank temperatures differentiate too far, because of excess unburned fuel potentially catching fire in the cats. Is there some failsafe device or sensor like that (in some way) on the late ‘86.5 - early ‘87 cars?
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Old 02-18-2019, 07:05 PM
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polecat702
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Originally Posted by Shark2626 View Post
Regarding a pair of exhaust temperature sensors on ‘88 and onwards cars that shuts down half of the cylinders if the left and right hand cylinder bank temperatures differentiate too far, because of excess unburned fuel potentially catching fire in the cats. Is there some failsafe device or sensor like that (in some way) on the late ‘86.5 - early ‘87 cars?
Pull the carpeted cover in the passenger side foot well cover for the EZK/LH computers. If there is one it's at the the bottom of the bracket that secures the computers. Roger sells a bypass relay. If it's shutting down half the cylinders, it'll have a red or green light lit up to tell which bank.
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Old 02-18-2019, 07:08 PM
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worf928
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Originally Posted by Shark2626 View Post
Is there some failsafe device or sensor like that (in some way) on the late ‘86.5 - early ‘87 cars?
Nope
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Old 02-18-2019, 07:30 PM
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Shark2626
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Originally Posted by worf928 View Post

Nope
thank you
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Old 02-19-2019, 01:18 AM
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Originally Posted by worf928 View Post

Nope
Nope, we S3 owners die like men.
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Old 02-20-2019, 04:38 AM
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It was only on 89+ cars and it would shut down half of the injectors due to half of the ignition system failing.

It can be used to help pinpoint which side has an issue, but at that point it is best to replace both items if one has failed, like the ignition drivers next to the hood latch which intermittently failed on my 89.
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Old 02-21-2019, 03:27 AM
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Originally Posted by The Forgotten On View Post
It was only on 89+ cars and it would shut down half of the injectors due to half of the ignition system failing.

It can be used to help pinpoint which side has an issue, but at that point it is best to replace both items if one has failed, like the ignition drivers next to the hood latch which intermittently failed on my 89.
Good, in theory. The replacement amplfiers are a far cry from being as good as the original ones, so I tend to only replace the one that failed.

And the replacement ignition coils are worse than the amplifiers.. iF you buy 2, you should buy 3, so when one fails, you will have a spare, in the car.
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Old 02-21-2019, 05:36 AM
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^^ I wish I could have figured out which one failed, but being intermittent and never activating the safety system meant I had to replace both. I still have both amps in case a way to test them reliably shows up.

I usually hunt for NOS German made Bosch parts but ignition amps didn't show up. Caps and rotors did though.
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