Flashing SES, rough idle
02-22-2013, 08:42 AM
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Flashing SES, rough idle Good morning all. I recently acquired an '02 Z28 A4 with stage 2 SLP kit, ported MAF and throttle body and MSD wires. And programming/tuning. Yesterday at a red light it started shaking and the SES light started flashing. I took off and it went away. I stopped again and it came back. I was going to take it to Autozone and have them pull the code. The manual said it might be cheap fuel. I had been gassing up (93 octane only) at a Tom thumb near my house, but yesterday my wife put some 93 in it at Valero.Could the fuel quality cause that? Any input would be helpful. Thanks.
02-22-2013, 08:15 PM
#6
Like LS6427 said a flashing SES indicates multiple cylinder misfires. Check over all wires plugs. I have also had a bad set of plugs cause a multiple cylinder misfire condition also, the plugs had less than 500 miles on.
Last edited by 2000PewterT/A; 02-22-2013 at 08:20 PM.
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02-25-2013, 05:04 PM
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03-03-2013, 10:24 PM
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Trying to blame the wife ... Thanks honey. 
. No it wasn't the gas.
The MAF has been cleaned, the wires have been checked. I disconnected the MAF sensor and at first it wasn't doing the rough idling. But then it started, just seem to take longer. Does everyone think that there's a good chance this will fix itself by changing out the wires and plugs. I don't want to go through the trouble if there might be something else easier to check.
. No it wasn't the gas. The MAF has been cleaned, the wires have been checked. I disconnected the MAF sensor and at first it wasn't doing the rough idling. But then it started, just seem to take longer. Does everyone think that there's a good chance this will fix itself by changing out the wires and plugs. I don't want to go through the trouble if there might be something else easier to check.
03-07-2013, 01:10 PM
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have you checked your o2 sensors my car would always misfire turns out the moisture was getting in the o2 extensions so i switched to vette sensors and problem was gone
03-07-2013, 07:11 PM
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Interesting. We checked to see if they had become disconnected but didn't really check for moisture. We've taken it back to the dealer where we got it and they've offered to replace the plugs to see if that was the issue. They've been really nice about it. If its not the plugs I'm sure they'll check the sensors.
