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Auto Mechanics a little help please. (1 Viewer)

brentl

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This should be simple for you guys/girls

2 or 3 times in the last month I've had the "service engine soon" light come on. It only stays on for about 15 seconds and then goes out. It only happens when it's cold(45-55DF)

I checked for a code, and it only came up with a code 43. I'm sure it's a sensor of some kind but I'm not sure which one

It ahsn't happened in the last 1 1/2 weeks. Could the sensor has failed completely and be operating at default??

Could a code 43 affect my upcoming emissions test.

I have a 1991 Pontiac Gooole(6000 le) with a 3.1L engine.

I just hope it's simple!

Thanks
Brent
P.s. I guess I'll do my O2 sensor since it's pretty cheap ...
 

Todd Hochard

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Jan 24, 1999
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Check the code here. 43 says low voltage to EST circuit.
You should check the battery voltage, with the car idling. It should be close to 14 volts, and should go to 14.2-14.4 when the engine is revved just above idle.
Also, check the power supply going to the ignition coils for each cylinder. I'm pretty sure this model has the distributorless ignition system. Make sure all connections to these modules are tight, and free of corrosion.
Todd
 

Zen Butler

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Zen K. Butler
P.s. I guess I'll do my O2 sensor since it's pretty cheap ...
I wouldn't change that yet. As Todd pointed to, check your battery voltage, while idling (do not put load on it!)
My guess is one of the ignition coil packs. If you haven't any symptoms after voltage checks okay (hopefully) Try clearing the codes, if the light reappears, pull the code again, this 43 code has appeared before at our dealership and a concern not duplicated.
 

Wes

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Try removing your battery cables and cleaning the terminals, and the wire ends!

Wes
 

brentl

Senior HTF Member
Joined
May 7, 1999
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Like I said, it hasn't happened in a going on 2 weeks.

I'll run into Canadian Tire and get them to check it. the alternator is only 6 months old, so it SHOULD be fine. Time to look at the battery.

Hopefully it isn't a coil pack or module, that's somethin I've never done.

Brent L
 

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