Rough idle and no accelerator above idle
Thread Starter
Teching In
Joined: Jul 2014
Posts: 6
Likes: 0
From: Seattle
Rough idle and no accelerator above idle I have a 93 Typhoon with a 97 Corvette LS1 engine (drive by wire). It was running just fine until it wasn't started for a couple of months. The idle is rough and doesn't sound like it is running on all 8 cylinders. I assumed the gas was bad so I added 3-4 gallons of premium. It seemed to idle a little better but I have no accelerator response, it will only idle. I did an OBD scan and it consistently throws codes:
P1120
P1125
P1220
P1281
P1516
Since P1120 indicates that the TPS is out of range, I replaced it. This made no difference.
I thought about replacing the APP sensor in the accelerator pedal assembly but instead of replacing parts that may or may not make a difference I want to diagnose the problem to find the cause.
Any suggestions?
Thanks
P1120
P1125
P1220
P1281
P1516
Since P1120 indicates that the TPS is out of range, I replaced it. This made no difference.
I thought about replacing the APP sensor in the accelerator pedal assembly but instead of replacing parts that may or may not make a difference I want to diagnose the problem to find the cause.
Any suggestions?
Thanks
TECH Fanatic
Joined: Jun 2003
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Thread Starter
Teching In
Joined: Jul 2014
Posts: 6
Likes: 0
From: Seattle
