LT1 running rich
04-01-2019, 10:50 PM
#23
06-09-2020, 01:37 PM
#24
Teching In
Join Date: Jul 2019
Location: Caledonia, Ontario
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Yup, going through similar issue myself, 96 LT1 with low rpm stumble that seems to be getting worse.
200k km A4 stock except for FIPK and muffler, only had it a year and not sure of age of plugs/wires/opti.
Car runs better after a restart or when I unplugged O2 sensor to force open loop. Seems to run strong upper rpm’s and wot.
Already changed egr that was shot, fuel filter too.
An OBD2 scanner for my phone is showing short term fuel trim on bank 2 sensor 1 N/A and the voltage doesn’t seem to bounce around as much as bank 1.
Not showing any codes right now, although in the fall the misfire was very severe and my shop changed plug 6 which was fouled.
So out I go to try to change bank 2 sensor, which also seems to have a different sleeve than bank 1, so maybe changed with a Bosch or something.
200k km A4 stock except for FIPK and muffler, only had it a year and not sure of age of plugs/wires/opti.
Car runs better after a restart or when I unplugged O2 sensor to force open loop. Seems to run strong upper rpm’s and wot.
Already changed egr that was shot, fuel filter too.
An OBD2 scanner for my phone is showing short term fuel trim on bank 2 sensor 1 N/A and the voltage doesn’t seem to bounce around as much as bank 1.
Not showing any codes right now, although in the fall the misfire was very severe and my shop changed plug 6 which was fouled.
So out I go to try to change bank 2 sensor, which also seems to have a different sleeve than bank 1, so maybe changed with a Bosch or something.
