Check Engine Light, goes off @ 4000 ish rpms

Unknone86
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Check Engine Light, goes off @ 4000 ish rpms

Postby Unknone86 » Tue Oct 22, 2013 5:59 pm

Hello,

Its been a while since I've been on the forum, like the new look.

I'm having issues with my check engine light. Basically stock early 4age, with MSD 6al.

It is on until about 4100rpm then goes off and stays off until the motor drops below 4000.

The code is saying to change the coil or distributor. I've changed the coil with different MSD coils and no luck. I rebuilt the distributor a few years ago and don't have a different one to try.

Any ideas? Is there a way to check the distributor?

Can the check engine light be turned off by resetting it some how?

Thanks

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jondee86
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Re: Check Engine Light, goes off @ 4000 ish rpms

Postby jondee86 » Fri Oct 25, 2013 5:33 am

Inside the distributor is all solid state... just reluctors to read the timing
wheels, and generate very low voltage signals for the ECU. You could check
the wiring for signs of chafing or damage just where the wires enter the
distributor and flex a lot... and make sure the connector plug is pushed
all the way in.

ECU reset happens any time you disconnect the battery for a few minutes.

Cheers... jondee86
The reasonable man adapts himself to the world; the unreasonable one
persists in trying to adapt the world to himself. Therefore, all progress
depends on the unreasonable man.

Unknone86
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Re: Check Engine Light, goes off @ 4000 ish rpms

Postby Unknone86 » Mon Oct 28, 2013 9:44 pm

Thanks jondee86. Yeah I figured that the only ecu reset was disconnecting the battery but I had to check.

I'll look over the distributor wires one more time but I might have to go old fashion and disconnect the bulb.

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BakaBaka
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Re: Check Engine Light, goes off @ 4000 ish rpms

Postby BakaBaka » Sun Nov 03, 2013 8:11 am

Just because the light isn't there anymore if you take the bulb out doesn't mean the problem is gone. I would look into it more thoroughly. The AE86 is simple mechanics.. shouldn't be too hard to solve. If the CEL is pointing to ignition coil/timing, I'd start there. Does the car behave abnormally when you go past 4k rpm? Any bogging/misfiring.. etc?

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OG UTOTMO
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Re: Check Engine Light, goes off @ 4000 ish rpms

Postby OG UTOTMO » Sun Nov 03, 2013 8:55 pm

Tps sensor needs to be replace i know this since it happened back in 2000 on my car. the car runs fine is just the check engine light is on but once you pass 4k it goes away

boogaov
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Re: Check Engine Light, goes off @ 4000 ish rpms

Postby boogaov » Mon Nov 04, 2013 4:12 am

My car has been doing the same for many months now. It's code 6 if I'm not mistaken which in theory has nothing to do with the TPS. My light goes off at 4K and the car behaves normal during all rpm ranges.

jdmbrazilian
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Re: Check Engine Light, goes off @ 4000 ish rpms

Postby jdmbrazilian » Tue Jun 23, 2020 12:45 pm

was this ever resolved having the same issue code 6 and light goes off after 4200 RPM on the highway

totta crolla
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Re: Check Engine Light, goes off @ 4000 ish rpms

Postby totta crolla » Wed Jun 24, 2020 1:36 am

Ok I'm going to throw this out there and it is what I'm thinking, not what I know for certain but it may be worth discussing...
Could an O2 sensor be at fault, one that is configured in the ECU to go open loop at above 4200rpm so it would stop reporting a fault over this rpm? Is there another sensor that would act consistently in this way? Is anything else triggered around that rpm? TVIS is approx. 4650rpm and has no fault reporting as far as I'm aware.

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