check engine light
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Joined: May 2002
Posts: 142
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From: Oklahoma City
Car: 1988 IROC
Engine: See Signature
Transmission: B&M 700r4
check engine light
I found out today i had no check engine light bulb, so i put on in, and i have 3 codes
13 Oxygen sensor signal stays lean during warm engine cruise
33 High voltage (low vacuum) at mass air flow sensor (or MAP sensor)
36 Burn off at mass air flow sensor OR
Problem in transmission shift OR
Fault in direct ignition system OR
Missing pulses in electronic spark timing signal
can anyone give any advice, as to curing these problems? or should i just take it somewhere?
13 Oxygen sensor signal stays lean during warm engine cruise
33 High voltage (low vacuum) at mass air flow sensor (or MAP sensor)
36 Burn off at mass air flow sensor OR
Problem in transmission shift OR
Fault in direct ignition system OR
Missing pulses in electronic spark timing signal
can anyone give any advice, as to curing these problems? or should i just take it somewhere?
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Joined: Jan 2000
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If your O² hasn't been changed in the last 30-40,000 miles, it's time. Just for grins, you might want to check the connector at the sensor first.
The '33' is a high indicated MAF flow. The cause is almost always a misadjusted TPS - almost. Just yesterday I had a very strange problem with a MAF burnoff relay that was failing and feeding a few volts to the burnoff circuit while the engine was running, completely screwing the MAF readings. It was also my first close inspection of a Painless Wiring harness, and it looked like a very nice, complete setup with all original wire colors and device connections.
The '36' is a failure of the MAF burnoff cycle. That is usually a MAF burnoff relay or connection problem. On rare occasions it can be caused by an intermittent auxilliary oil pressure switch that interrupts the I mentioned the burn off cycle.
And of course you'll want to clear the ECM of codes once you determine the problems and repair them.
The '33' is a high indicated MAF flow. The cause is almost always a misadjusted TPS - almost. Just yesterday I had a very strange problem with a MAF burnoff relay that was failing and feeding a few volts to the burnoff circuit while the engine was running, completely screwing the MAF readings. It was also my first close inspection of a Painless Wiring harness, and it looked like a very nice, complete setup with all original wire colors and device connections.
The '36' is a failure of the MAF burnoff cycle. That is usually a MAF burnoff relay or connection problem. On rare occasions it can be caused by an intermittent auxilliary oil pressure switch that interrupts the I mentioned the burn off cycle.
And of course you'll want to clear the ECM of codes once you determine the problems and repair them.
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Joined: Jan 2000
Posts: 19,651
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Oxygen sensor threshold voltages normally don't get programmed differently. Unless I'm missing something significant, your modifications should not be so severe that the engine wouldn't run normally with the stock programming. You ARE using a PROM for an L98, correct? A few more cubes might affect the '33', but the '13' shouldn't be an issue unless the Jet Stage 2 programming has done something really screwy to the injector constants or fuel map tables.
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Joined: Dec 2002
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IS code 36 always the burn-off cycle?? If so why are the other possible causes listed for that code?? I currently have the same code, and am going to try and solve it this weekend. I am just trying to get all my facts straight.
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