Running problems
Discussion
Hi all, I just got my '86 a couple of weeks ago and have ran into my first problem.
The other day I started the car and it started in a cloud of smoke and was running very rough, idle low and struggling and the SES light was on. I was at work so needed to get it home so drove with the light on, even though I normally wouldn't. Drove to a petrol station, the car was warmed up by the time I got there, switched off and when I came out and started it, it started perfect, idle was fine and no SES light. Drove home without any problems. The next day, started badly again and the SES light is back on. Pulled the codes and had 33, 34 and 36.
Searched the codes and figured I have MAF issues. Cleared the codes and started it up. Struggles to start and the idle is rough and it's trying to stall. SES light comes on instantly. Checked codes again and just have 33.
Disconnected the MAF and it makes no difference whatsoever.
Found this site with diagnostic flow charts for the various error codes: http://members.shaw.ca/corvette86/
I followed the chart and test 3 (MAF terminal E to ground) gave 9.4 volts. It says use a test light, but I only had a multimeter. I'm assuming the 9.4 volts is ok and would count as 'test light on'.
Test 4 (MAF terminal D to ground) according to the sheet should read 0, but I got 1 volt.
Test 5 was fine - 5.03 volts.
Going by this, my problem should be a faulty MAF. But, I'm not sure that the 1 volt reading for test 2 should count as 'ok' or 'not ok'. Following 'not ok' and disconnecting the burn-off relay the test still gave 1 volt. Which according to that document is a short from the burn-off relay to the MAF sensor.
The question is, is that 1 volt to the MAF from the burn-off circuit (terminal D) causing a problem? Or do I need a new MAF?
The other day I started the car and it started in a cloud of smoke and was running very rough, idle low and struggling and the SES light was on. I was at work so needed to get it home so drove with the light on, even though I normally wouldn't. Drove to a petrol station, the car was warmed up by the time I got there, switched off and when I came out and started it, it started perfect, idle was fine and no SES light. Drove home without any problems. The next day, started badly again and the SES light is back on. Pulled the codes and had 33, 34 and 36.
Searched the codes and figured I have MAF issues. Cleared the codes and started it up. Struggles to start and the idle is rough and it's trying to stall. SES light comes on instantly. Checked codes again and just have 33.
Disconnected the MAF and it makes no difference whatsoever.
Found this site with diagnostic flow charts for the various error codes: http://members.shaw.ca/corvette86/
I followed the chart and test 3 (MAF terminal E to ground) gave 9.4 volts. It says use a test light, but I only had a multimeter. I'm assuming the 9.4 volts is ok and would count as 'test light on'.
Test 4 (MAF terminal D to ground) according to the sheet should read 0, but I got 1 volt.
Test 5 was fine - 5.03 volts.
Going by this, my problem should be a faulty MAF. But, I'm not sure that the 1 volt reading for test 2 should count as 'ok' or 'not ok'. Following 'not ok' and disconnecting the burn-off relay the test still gave 1 volt. Which according to that document is a short from the burn-off relay to the MAF sensor.
The question is, is that 1 volt to the MAF from the burn-off circuit (terminal D) causing a problem? Or do I need a new MAF?
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