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Hey guys,
Its been a while since i've posted but i'm having a HUGE problem... i'm going to be detailed so I can give everyone a good understanding of whats goin on...
The circumstances: So, last nite, drove to downtown Detroit for a meeting. Parked way up in a garage. Everythings fine. Get out of the meeting, start up, and start on the spiral ramp down to the bottom. Dont wanna fry my brakes so i throw it into 1st and let the engine brake me the whole way down. Get out on the road, dont notice anything. Start to get on the highway, go to punch it and just bogging. The worst I've ever heard. Barely any power, just a really mean boggy exhaust note. Cant go more than 30% throttle the whole way home. So i get it back to the gas station around the block from my house (its rainy) and pop the hood. Maybe I sucked up a newspaper or sumthing into my CAI. Nope. Clean as a whistle. Close it up, start up again and its like nothing ever happened. Full power the whole way through. WOT goes beautifully as my head hit the seat.
Go inside, grab HPTuners to check the readouts. Start it up again and now its worse than it was 5 minutes before. Just nothing. Can barely get to 40. Get a bunch of data and call it a nite.
This morning i went to get more data, start it up and barely keeping 400 rpms for like 30 seconds before it evens out. Sweet. Drive around and it gets better (a little). So, right now, i can give it about 50% throttle and i get the most power. anything past that and it bogs. It sounds just like if you tried to start a car from stop in 3rd gear. I can get to 80 mph eventually and its fine. RPMS dont seem to matter much. It seems directly correlated to how much throttle i give it.
This is the technical stuff: No flashing codes. Same codes i've always had (low O2 voltage all around... I think it has something to do with a bad ground). HP readouts show almost no KR, fuel trim are a little rich if anything (but thats due to the low O2 volts and its always been that way). Both MAP and MAF sensors are mirroring each other. Steady 35 kPa at idle for the MAP climbing to 90-100 on acceleration. Spark advance is right in line with what it should be, O2's toggling (except for the oddball occasion when they go to 0, which again is that ground issue). Injector duty % looks similar to the ones I see on previous scans. All this for a stock tune. I whipped up a quick tune to even everything out and kill what little KR there was. Still the same old problems. Driving around, i found that forcing it into closed loop helped a little while forcing into open loop made it even worse. The readouts dont show anything different between a normal acceleration and the boggy kind, except for a ratcheted line on my rpms (very squiggly, not referring to the shifts.... like 3500/3490/3502/3509/3499/3498/3505/3515... kinda like that) and a very slow build up of speed.
My first instict would be to call it an exhaust restriction and call it a day. But....... i dont have a cat. Just a straight thru glass pack resonator. I took a quick look down the tailpipes and didnt see anything. No flashlight to look all the way down but it doesnt feel like theres any difference between the two when i stick my hand in front of them while the engine's running.
I'm at a loss of what to test. I want to say its something electrical or a sticky injector (i just threw in a thing of Techron so we'll see if that helps) because its so intermittant in its severity. If it was a mechanical issue like a busted up spark plug I think it would be a constant thing.
PLEASE give me some help asap guys!
Its been a while since i've posted but i'm having a HUGE problem... i'm going to be detailed so I can give everyone a good understanding of whats goin on...
The circumstances: So, last nite, drove to downtown Detroit for a meeting. Parked way up in a garage. Everythings fine. Get out of the meeting, start up, and start on the spiral ramp down to the bottom. Dont wanna fry my brakes so i throw it into 1st and let the engine brake me the whole way down. Get out on the road, dont notice anything. Start to get on the highway, go to punch it and just bogging. The worst I've ever heard. Barely any power, just a really mean boggy exhaust note. Cant go more than 30% throttle the whole way home. So i get it back to the gas station around the block from my house (its rainy) and pop the hood. Maybe I sucked up a newspaper or sumthing into my CAI. Nope. Clean as a whistle. Close it up, start up again and its like nothing ever happened. Full power the whole way through. WOT goes beautifully as my head hit the seat.
Go inside, grab HPTuners to check the readouts. Start it up again and now its worse than it was 5 minutes before. Just nothing. Can barely get to 40. Get a bunch of data and call it a nite.
This morning i went to get more data, start it up and barely keeping 400 rpms for like 30 seconds before it evens out. Sweet. Drive around and it gets better (a little). So, right now, i can give it about 50% throttle and i get the most power. anything past that and it bogs. It sounds just like if you tried to start a car from stop in 3rd gear. I can get to 80 mph eventually and its fine. RPMS dont seem to matter much. It seems directly correlated to how much throttle i give it.
This is the technical stuff: No flashing codes. Same codes i've always had (low O2 voltage all around... I think it has something to do with a bad ground). HP readouts show almost no KR, fuel trim are a little rich if anything (but thats due to the low O2 volts and its always been that way). Both MAP and MAF sensors are mirroring each other. Steady 35 kPa at idle for the MAP climbing to 90-100 on acceleration. Spark advance is right in line with what it should be, O2's toggling (except for the oddball occasion when they go to 0, which again is that ground issue). Injector duty % looks similar to the ones I see on previous scans. All this for a stock tune. I whipped up a quick tune to even everything out and kill what little KR there was. Still the same old problems. Driving around, i found that forcing it into closed loop helped a little while forcing into open loop made it even worse. The readouts dont show anything different between a normal acceleration and the boggy kind, except for a ratcheted line on my rpms (very squiggly, not referring to the shifts.... like 3500/3490/3502/3509/3499/3498/3505/3515... kinda like that) and a very slow build up of speed.
My first instict would be to call it an exhaust restriction and call it a day. But....... i dont have a cat. Just a straight thru glass pack resonator. I took a quick look down the tailpipes and didnt see anything. No flashlight to look all the way down but it doesnt feel like theres any difference between the two when i stick my hand in front of them while the engine's running.
I'm at a loss of what to test. I want to say its something electrical or a sticky injector (i just threw in a thing of Techron so we'll see if that helps) because its so intermittant in its severity. If it was a mechanical issue like a busted up spark plug I think it would be a constant thing.
PLEASE give me some help asap guys!
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