Interesting take on 1990 INFL REST light
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Joined: Mar 2017
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From: Saint Louis Missouri
Interesting take on 1990 INFL REST light
Bought my 1990 coupe March 31. It came with the INFL REST lit. I did the recommended ALDL test, showed right sensor. Reset it. Fine for about a week then the light returned. Just drove it like that.
In the meantime, I had noted oil at the back of the engine which was getting more significant. Traced to oil pressure switch. Replaced that. Leak solved.
About a month after replacing the switch, I decided to check the INFL REST again. Same code, right sensor. So I did a reset. Been almost a month and (knock on wood) light has not returned. And I drive the car almost everyday so it has plenty of drive cycles on it.
The ground for the SIR module is near the oil filter and that area was pretty saturated with oil during the pressure switch leak.
Just wondering if that had anything to do with the SIR code. Perhaps the oil raised the resistance of that reference ground? Long shot I'll grant you.
Just a thought. Heck, I'm just happy the light's out!
And I love the 90. Currently has 47,000 miles on it. Just getting broken in.
In the meantime, I had noted oil at the back of the engine which was getting more significant. Traced to oil pressure switch. Replaced that. Leak solved.
About a month after replacing the switch, I decided to check the INFL REST again. Same code, right sensor. So I did a reset. Been almost a month and (knock on wood) light has not returned. And I drive the car almost everyday so it has plenty of drive cycles on it.
The ground for the SIR module is near the oil filter and that area was pretty saturated with oil during the pressure switch leak.
Just wondering if that had anything to do with the SIR code. Perhaps the oil raised the resistance of that reference ground? Long shot I'll grant you.
Just a thought. Heck, I'm just happy the light's out!
And I love the 90. Currently has 47,000 miles on it. Just getting broken in.
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From: Southlake, TX
The factory fix for 91 (and for 90) was to add dielectric grease tot he mounting surfaces. You can take the module off, wire brush the frame and module contact points and coat everything with dielectric grease.
Last edited by billschroeder5842; Jul 2, 2017 at 03:55 PM.
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