Alright gents, I'm about at my wits end. I've got an 08 GT and I've been battling some type of gremlin for a few months now. I'm going to start at the very beginning. This is going to be a long thread so bear with me.
Back in March I installed my wotbox. Car didn't want to idle after I had disconnected the battery. Did the idle relearn procedure and everything was gravy for about 2 weeks.
A few days after the first test n tune of drag season, the car would occasionally sputter while driving and only while driving. It would usually happen in 3rd and 4th gear at around 2,000 rpm under partial throttle. I figured it was the plugs.
Pulled the old plugs out (ht0's) and sure enough they were a mess. Installed new Champion 7989 plugs and all was good for about 2 days. Then the hesitation came back.
It's been gradually getting worse over the past month. I run my car at an 1/8th mile track every Thursday without fail and it runs good. On the way home and driving around the following days is when the trouble starts.
Wednesday I came to the conclusion that I had possibly either gotten bad gas, had a clogged fuel filter or my fuel pump was going out. Because the car only acts that way when it has a quarter tank or less. (So I thought)
Anyway, Thursday after work I put in a 1/3 of a can of seafoam and filled my tank from a quarter full to half full. I checked all my plugs, they looked great. I took off my throttle body and cleaned it. I cleaned the MAF. I reloaded my bama tune that I've had no trouble out of for the past year, but I figured it wouldn't hurt.
When I got to the track, it was hauling ass. It made the best pass it has ever made. On the way home, no trouble.
Friday - got off work and had to drive a few towns over (about 30 miles) I got on the highway and had made it maybe 10 miles at a pretty consistent 70 mph or 2500ish rpms which is right in the danger zone to make it start acting up. Sure enough, it did. The lower on gas I got, the more it sputtered. It's kind of like the car is coughing. You'll get a clunk from the drivetrain and a sudden jolt and then it'll be back to normal for a few minutes.
I decided if it was bad gas, I'd run out as much as I could. Ran it until the light came on and then stopped at the gas station. By the time I got there it didn't even want to run. Sputtering nonstop, rpms dropping super low and then jumping back up when I engaged the clutch, etc.
Pulled up to the gas pump, added the rest of my can of seafoam, filled my tank up to about 3/4 and fired it up. It immediately tried to die as soon as I pulled out. However, once it ran for about a minute, it was back to normal. Felt strong. I didn't have anymore problems out of it all night.
Yesterday (Saturday) - got in the car to take my old lady out for mothers day. I had started the car earlier in the day and it sounded a little off. I revved it some and it sounded kind of bubbly and had a lot more popping to it than normal. Anyway, we take off. Car does fine for about 2 minutes, then starts the hesitation. It gradually gets worse and worse until it's basically bucking down the road. I feel a loss of power under throttle, and then boom, it dies. I clutch it, let it roll, then start it back. It does not sound good. It sounds like it's running on 4 cylinders while giving me whiplash doing its bucking bronco bit.
I look down and the wrench light is on, which I believe is limp mode. Correct me.
I turn around and manage to get it home, while it's still trying to die and sounds awful.
Got my SCT out and pulled the codes.
P0330 (knock sensor bank 2) which would explain why it was down on power. PCM cut timing.
P1000 (obd2 monitor testing not complete)
P061B (internal control module torque calculation performance)
I could really use some advice my friends. I'm leaning towards bad gas or one or more bad COP's.
Now, here's what my dad thinks: "that damn box you put on is what's causing it. There ain't a doubt in my mind."
He could very well have a point. The wotbox is spliced directly into the main coil power wire. If the box has a short or some of the soldering didn't hold up so well, it could be causing power surges I suppose.
Anyway, it's 3:28 am. I'm out of ideas. Help me out guys lol.
Back in March I installed my wotbox. Car didn't want to idle after I had disconnected the battery. Did the idle relearn procedure and everything was gravy for about 2 weeks.
A few days after the first test n tune of drag season, the car would occasionally sputter while driving and only while driving. It would usually happen in 3rd and 4th gear at around 2,000 rpm under partial throttle. I figured it was the plugs.
Pulled the old plugs out (ht0's) and sure enough they were a mess. Installed new Champion 7989 plugs and all was good for about 2 days. Then the hesitation came back.
It's been gradually getting worse over the past month. I run my car at an 1/8th mile track every Thursday without fail and it runs good. On the way home and driving around the following days is when the trouble starts.
Wednesday I came to the conclusion that I had possibly either gotten bad gas, had a clogged fuel filter or my fuel pump was going out. Because the car only acts that way when it has a quarter tank or less. (So I thought)
Anyway, Thursday after work I put in a 1/3 of a can of seafoam and filled my tank from a quarter full to half full. I checked all my plugs, they looked great. I took off my throttle body and cleaned it. I cleaned the MAF. I reloaded my bama tune that I've had no trouble out of for the past year, but I figured it wouldn't hurt.
When I got to the track, it was hauling ass. It made the best pass it has ever made. On the way home, no trouble.
Friday - got off work and had to drive a few towns over (about 30 miles) I got on the highway and had made it maybe 10 miles at a pretty consistent 70 mph or 2500ish rpms which is right in the danger zone to make it start acting up. Sure enough, it did. The lower on gas I got, the more it sputtered. It's kind of like the car is coughing. You'll get a clunk from the drivetrain and a sudden jolt and then it'll be back to normal for a few minutes.
I decided if it was bad gas, I'd run out as much as I could. Ran it until the light came on and then stopped at the gas station. By the time I got there it didn't even want to run. Sputtering nonstop, rpms dropping super low and then jumping back up when I engaged the clutch, etc.
Pulled up to the gas pump, added the rest of my can of seafoam, filled my tank up to about 3/4 and fired it up. It immediately tried to die as soon as I pulled out. However, once it ran for about a minute, it was back to normal. Felt strong. I didn't have anymore problems out of it all night.
Yesterday (Saturday) - got in the car to take my old lady out for mothers day. I had started the car earlier in the day and it sounded a little off. I revved it some and it sounded kind of bubbly and had a lot more popping to it than normal. Anyway, we take off. Car does fine for about 2 minutes, then starts the hesitation. It gradually gets worse and worse until it's basically bucking down the road. I feel a loss of power under throttle, and then boom, it dies. I clutch it, let it roll, then start it back. It does not sound good. It sounds like it's running on 4 cylinders while giving me whiplash doing its bucking bronco bit.
I look down and the wrench light is on, which I believe is limp mode. Correct me.
I turn around and manage to get it home, while it's still trying to die and sounds awful.
Got my SCT out and pulled the codes.
P0330 (knock sensor bank 2) which would explain why it was down on power. PCM cut timing.
P1000 (obd2 monitor testing not complete)
P061B (internal control module torque calculation performance)
I could really use some advice my friends. I'm leaning towards bad gas or one or more bad COP's.
Now, here's what my dad thinks: "that damn box you put on is what's causing it. There ain't a doubt in my mind."
He could very well have a point. The wotbox is spliced directly into the main coil power wire. If the box has a short or some of the soldering didn't hold up so well, it could be causing power surges I suppose.
Anyway, it's 3:28 am. I'm out of ideas. Help me out guys lol.
