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Old 03-21-2018, 08:06 PM   #1 (permalink)
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Question Check engine light?

i have a 1987 samurai, US built, 1.3L-8V, all stock. I have been trying to figure out why it is running lean. Runs good driving down the road (I never beliaved i could get it to go 80mph) have not got the warm idle right yet. Check Engine Light is not working (burnt out or clipped). Before I go to the trouble of fixing the light, If I understand right?... It only blinks or stays solid light when checking the ECM, and gives no codes (only indicates all good or something wrong)...is this correct? Also what sensors will actually turn the check engine light on? thanks for the previous help.
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Old 04-05-2018, 12:58 PM   #2 (permalink)
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Those model Samurais don't have a "check engine" light really, it's a "service required" light and it turns on at pre-set mileage intervals. There's a switch down below the dash that turns it back off again. I don't think it's any help for diagnosing the ECM.
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Old 04-05-2018, 02:13 PM   #3 (permalink)
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I don't think they have an ECM as such - they have an "electronic feedback" carburetor, not fuel injection.
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Old 04-05-2018, 02:45 PM   #4 (permalink)
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Quote:
Originally Posted by fordem View Post
I don't think they have an ECM as such - they have an "electronic feedback" carburetor, not fuel injection.
There's a little computer above the glove box, not sure how much stuff it controls, but when they die you can't drive so =)
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Old 04-05-2018, 05:50 PM   #5 (permalink)
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There's a reason I used the words "as such" - yes, there is an electronic computer, which Suzuki calls the emission control computer - it does control the MCS (mixture control solenoid) on the carburetor - but as far as I'm aware, it does not perform any "on board diagnostics".

Also - I'm more than willing to admit a lack of familiarity with the Hitachi electronic feedback carbs - the Samurais we got all used Aisin carbs, not the Hitachi, which, I as far as I'm aware were only used in North America - I've seen vehicles running without the computer, with no other modifications - it's my understanding that without the computer, or with a defective MCS, the engine will just run rich.

For what it's worth - here's a link to the wiring for system over at Ack's FAQ - no CEL, and apart from the oxygen sensor, no real sensors to speak of - no coolant temp, no air temp, and for throttle position it's either closed (or idle) and wide open.

I can't help but wonder if the computer failed in such a way that the mixture solenoid was held closed, if it would run lean, or as you suggest, not run at all...

madmolly - if you're not familiar with Ack's FAQ check it out, it's a treasure trove of Suzuki information.
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