Hi community, here is the setup as of now:
Block:
JE pistons
Eagle rods
teflon crank scraper
new oil squirters
driftmotion upgraded oil pump
AN mandrel bent oil supply tube
ATI crank pulley
Head:
STOCK
EGR delete
Cometic MHG
Coolant tubes for TB and ISCV bypass
NGK BCPR7E7-11 gapped .030
Turbo:
57 trim with 10 degree clip on exhaust
Peripherals:
2.5in hardpipes
spearco replica IC
Synapse Synchronic BOV (unrecirculated, has anti stall kit installed)
Stock AFM housing with stock AFM
Fuel:
STOCK
J-pipe delete
Charcoal Canister delete (has vented gas cap)
Electronics:
Stock ECU
AEM UEGO
AEM Truboost (unprogrammed)
AEM trans temp
Transmission:
Stock A340E
3200 stall torque converter
Upgraded valve body from Devin
That's all I can think of for now, and now the problem:
Initially during the first drive, the car was hesitating big time with any application of throttle. It felt like really small fuel cuts when I applied the throttle to accelerate. So the next day, I swapped out my AFM for another unit off my Lexus SC. It removed the crazy fuel cut like issues on acceleration and the car was smoother overall, however during cruising around speeds of 60+ if I maintained throttle, at some point the car would begin to sputter/hesitate and AFRs would spike rich (10) at that point I could let off just a tad bit and it would be ok, but if I gave it more gas, the car would pull but the engine revs sounded like they were coming in waves, like a thrumming sound. The engine also refused to go high rpms and had trouble getting to 5k via throttle. If I downshifted from a high gear at speeds, it would rev to 5k (am doing this a lot to make the engine see lots of vacuum for break in). I came home and found CEL code 11, which was fixed my me cleaning/sanding the ground point on the intake runners.
Today I regapped my spark plugs from the suggested .025 to .030. This removed all the low speed breaking up, engine was fine revving to any rpm during load (at idle it was perfect from the get go!!). However, at cruising speeds, the sputter was still there, however I felt it was much more specific and I was able to induce it on command. Once I reached a very specific throttle point, I would lessen pressure just a hair and induce the sputter, and again if I applied more throttle or less, it was fine. AFRs at cruising was 11-12 so pretty rich, and when the car sputtered, it would spike to 10. NO CEL codes.
I came back and was suggested that I disconnect my TPS and see if that changed anything, which it did NOT. I am not sure if that means my TPS is faulty or not, but I took it off to test resistances and it passed as per the tsrm. Again, when I disconnected my TPS, the car ran exactly the same. Only difference was my idle jumped from 650rpm to 1000rpm and I got a CEL code 51, which reconnecting the TPS cleared out.
I haven't driven her since, so the specs I listed above are the latest. I want to make it clear that I am not getting any CEL codes. AFRs are spiking rich, cruising is still rich 12-13 range.
What do you guys think my problem could be?
I thought it might be a fuel issue, I had a quarter tank sitting there for a year and a half. We mixed it with 5 gallons of Shell 93 octane and started the car, did all the priming and timing etc, and then on the first drive filled it up the rest of the way with Chevron Premium. This morning the gauge showed close to empty, so I filled it with another 12 gallons of Chevron premium, so any bad gas in there should be gone by now.
If it is my TPS, I have no way of trying a different one as I am the only running turbo 7M in Austin to my knowledge. Again, the TPS passed resistance inspection as per tsrm.
I had wondered if perhaps the 57 trim and all that hardpipes was just too much air for the stock afm/fuel set up to handle, but that doesn't make sense.
My roommate suggested that the weird throttle response might be related to the higher stall interacting with the stock ECU, as in it's unsure whether to shift or not at certain throttle points. However this does not explain the rich condition.
I am out of ideas, so please, feel free to comment and suggest ideas. Thanks guys!!!
Block:
JE pistons
Eagle rods
teflon crank scraper
new oil squirters
driftmotion upgraded oil pump
AN mandrel bent oil supply tube
ATI crank pulley
Head:
STOCK
EGR delete
Cometic MHG
Coolant tubes for TB and ISCV bypass
NGK BCPR7E7-11 gapped .030
Turbo:
57 trim with 10 degree clip on exhaust
Peripherals:
2.5in hardpipes
spearco replica IC
Synapse Synchronic BOV (unrecirculated, has anti stall kit installed)
Stock AFM housing with stock AFM
Fuel:
STOCK
J-pipe delete
Charcoal Canister delete (has vented gas cap)
Electronics:
Stock ECU
AEM UEGO
AEM Truboost (unprogrammed)
AEM trans temp
Transmission:
Stock A340E
3200 stall torque converter
Upgraded valve body from Devin
That's all I can think of for now, and now the problem:
Initially during the first drive, the car was hesitating big time with any application of throttle. It felt like really small fuel cuts when I applied the throttle to accelerate. So the next day, I swapped out my AFM for another unit off my Lexus SC. It removed the crazy fuel cut like issues on acceleration and the car was smoother overall, however during cruising around speeds of 60+ if I maintained throttle, at some point the car would begin to sputter/hesitate and AFRs would spike rich (10) at that point I could let off just a tad bit and it would be ok, but if I gave it more gas, the car would pull but the engine revs sounded like they were coming in waves, like a thrumming sound. The engine also refused to go high rpms and had trouble getting to 5k via throttle. If I downshifted from a high gear at speeds, it would rev to 5k (am doing this a lot to make the engine see lots of vacuum for break in). I came home and found CEL code 11, which was fixed my me cleaning/sanding the ground point on the intake runners.
Today I regapped my spark plugs from the suggested .025 to .030. This removed all the low speed breaking up, engine was fine revving to any rpm during load (at idle it was perfect from the get go!!). However, at cruising speeds, the sputter was still there, however I felt it was much more specific and I was able to induce it on command. Once I reached a very specific throttle point, I would lessen pressure just a hair and induce the sputter, and again if I applied more throttle or less, it was fine. AFRs at cruising was 11-12 so pretty rich, and when the car sputtered, it would spike to 10. NO CEL codes.
I came back and was suggested that I disconnect my TPS and see if that changed anything, which it did NOT. I am not sure if that means my TPS is faulty or not, but I took it off to test resistances and it passed as per the tsrm. Again, when I disconnected my TPS, the car ran exactly the same. Only difference was my idle jumped from 650rpm to 1000rpm and I got a CEL code 51, which reconnecting the TPS cleared out.
I haven't driven her since, so the specs I listed above are the latest. I want to make it clear that I am not getting any CEL codes. AFRs are spiking rich, cruising is still rich 12-13 range.
What do you guys think my problem could be?
I thought it might be a fuel issue, I had a quarter tank sitting there for a year and a half. We mixed it with 5 gallons of Shell 93 octane and started the car, did all the priming and timing etc, and then on the first drive filled it up the rest of the way with Chevron Premium. This morning the gauge showed close to empty, so I filled it with another 12 gallons of Chevron premium, so any bad gas in there should be gone by now.
If it is my TPS, I have no way of trying a different one as I am the only running turbo 7M in Austin to my knowledge. Again, the TPS passed resistance inspection as per tsrm.
I had wondered if perhaps the 57 trim and all that hardpipes was just too much air for the stock afm/fuel set up to handle, but that doesn't make sense.
My roommate suggested that the weird throttle response might be related to the higher stall interacting with the stock ECU, as in it's unsure whether to shift or not at certain throttle points. However this does not explain the rich condition.
I am out of ideas, so please, feel free to comment and suggest ideas. Thanks guys!!!
