ChrisFlo
15+ Year Contributor
- 412
- 2
- Aug 29, 2004
-
Tucson,
Arizona
I have a 98 gst.
After months of problems I finally gave in and took my car to an auto shop. They told me I had a bad TPS sensor, so I gave the go ahead to replace it.
However, the car has once again begun acting up on me. I'm getting idle surge, with the car jumping between 1k and 2.5k. I first thought it was the result of a bad MAS, but after closer inspection I'm starting to think that once again, I somehow ended up with another bad TPS. Below are fixes I've tried, as well as symptoms after various tests.
Fixes tried
New spark plugs and wires
"New" TPS (from shop)
Two ISC's tested
Two MAP sensors tested
Biss screw adjustment
Vacuum/boost leak test
Two batteries tried
fuel pump inspection
Symptoms and tests
1. With the car running, and just the TPS unplugged, the car holds a steady idle but that idle sits at the 2k range.
2. When plugging the TPS back in, the car begins surging between 1 and 2.5k rpms
3. With the TPS plugged in, I tried unhooking the ISC. No change. Still surging.
4. With the TPS plugged in, I tried unhooking the MAS. The car almost dies, as it should.
I'm pretty convinced that another TPS is needed following these results. Any advice that can help me get this car up and going will be greatly appreciated.
After months of problems I finally gave in and took my car to an auto shop. They told me I had a bad TPS sensor, so I gave the go ahead to replace it.
However, the car has once again begun acting up on me. I'm getting idle surge, with the car jumping between 1k and 2.5k. I first thought it was the result of a bad MAS, but after closer inspection I'm starting to think that once again, I somehow ended up with another bad TPS. Below are fixes I've tried, as well as symptoms after various tests.
Fixes tried
New spark plugs and wires
"New" TPS (from shop)
Two ISC's tested
Two MAP sensors tested
Biss screw adjustment
Vacuum/boost leak test
Two batteries tried
fuel pump inspection
Symptoms and tests
1. With the car running, and just the TPS unplugged, the car holds a steady idle but that idle sits at the 2k range.
2. When plugging the TPS back in, the car begins surging between 1 and 2.5k rpms
3. With the TPS plugged in, I tried unhooking the ISC. No change. Still surging.
4. With the TPS plugged in, I tried unhooking the MAS. The car almost dies, as it should.
I'm pretty convinced that another TPS is needed following these results. Any advice that can help me get this car up and going will be greatly appreciated.