After about 100 man hours, Im almost to the point of giving up and selling this car. I got 16mpg with 4.56's, and now with the right rear and gears, Im getting 14. (I havent misread the odometer. I always calculated with the wrong gears.)
What Ive done:
Got 3.42's back in it. ($1300 later)
Replaced my crappy 28# injectors with new 50's.
Autolite 24's
Replaced a bad plug wire. All wires Ohm well.
Coil packs Ohm well.
Set the cam sensor.
Set the IAC
Adjusted TPS and sweeped the whole signal. its good.
The PCV valve is good. I also set up a catch can for it. The volume is about 1/2 pint. After only 300 miles, the can is more than half full.
I replaced the O2 sensor. This one shows far more active o2 crosscounts than my old one.
Tightened up my crossover.
Tuned it to good BLM's.
Checked everywhere for vacuum leaks. (Im getting about 18" at idle.
Tried a different MAF.
Bellmouthed the IC inlet.
All hose clamps are tight and everything is sealed as far as i can tell.
EGR valve and solenoid are good.
I have no misfiring anymore ( I had major misfiring when I was getting 16mpg)
Set FP to 38 line off.
Compression is 150psi all around.
All the brakes dont drag, and the bearings seem ok. The Ebrake cable is set loose as well.
I even have my tire pressure up to 38 on all tires.
I always stay on the vacuum side when cruising and never get on it (cant afford to.
Only MAF code I have is from when I disconnected it while running (24) I havent cleared it cause Ill have to re-program everything)
The engine idles smooth in open loop idle, but a bit rougher in closed loop.
I know Ive done alot more. I just cant remember everything right now.
Ive thought of a clogged cat, but usually when that happens, the car makes no power and you have to give it alot of gas to keep speed up. I dont have to do this. I barely have to give it any gas to cruise. I also checked for balooning and this hasnt happened.
I have no TCC lockup. Im still tracing this problem down, but I think I dont have a lockup convertor cause I can bring the rpms up to 3000 rpm before boost even starts building. The purple wire has been disconnected by the prior owner for some reason. Only reason I can think of would be if he had a non lockup in here. If the solenoid was bad, I dont see why he would pull that wire out. At 70mph, Im at about 2200rpm going downhill and about 2800 going uphill. I dont believe the tranny is slipping. It shifts very firm.
Lou Czarnota said that he has run many turbo regals with non lockup convertors, and none of them got less than 19mpg. How much of a mileage difference have you guys seen with the lockup?
I havent had the plenum off to look inside yet, but I was told that the heads had been ported and it had a small cam. The engine doesnt really idle like it has a cam though. Regardless, it obviously doesnt have enough overlap to affect vacuum (18"), or cause a lopey idle. Perhaps whoever ported the heads ****ed them up to the point they flow much worse than stock. Ive seen this happen. But, like I said, I barely have to give it any gas to get the car moving and keep it moving.
It runs really strong under boost.
The prior owner hosed the wastegate up in a weird way, but it does work.
There is no water in the oil or vice versa. The oil is kind of old though. Like 5000 miles old. This never killed my mileage on any prior cars.
I know you guys are sick of hearing this, but please help.
What Ive done:
Got 3.42's back in it. ($1300 later)
Replaced my crappy 28# injectors with new 50's.
Autolite 24's
Replaced a bad plug wire. All wires Ohm well.
Coil packs Ohm well.
Set the cam sensor.
Set the IAC
Adjusted TPS and sweeped the whole signal. its good.
The PCV valve is good. I also set up a catch can for it. The volume is about 1/2 pint. After only 300 miles, the can is more than half full.
I replaced the O2 sensor. This one shows far more active o2 crosscounts than my old one.
Tightened up my crossover.
Tuned it to good BLM's.
Checked everywhere for vacuum leaks. (Im getting about 18" at idle.
Tried a different MAF.
Bellmouthed the IC inlet.
All hose clamps are tight and everything is sealed as far as i can tell.
EGR valve and solenoid are good.
I have no misfiring anymore ( I had major misfiring when I was getting 16mpg)
Set FP to 38 line off.
Compression is 150psi all around.
All the brakes dont drag, and the bearings seem ok. The Ebrake cable is set loose as well.
I even have my tire pressure up to 38 on all tires.
I always stay on the vacuum side when cruising and never get on it (cant afford to.
Only MAF code I have is from when I disconnected it while running (24) I havent cleared it cause Ill have to re-program everything)
The engine idles smooth in open loop idle, but a bit rougher in closed loop.
I know Ive done alot more. I just cant remember everything right now.
Ive thought of a clogged cat, but usually when that happens, the car makes no power and you have to give it alot of gas to keep speed up. I dont have to do this. I barely have to give it any gas to cruise. I also checked for balooning and this hasnt happened.
I have no TCC lockup. Im still tracing this problem down, but I think I dont have a lockup convertor cause I can bring the rpms up to 3000 rpm before boost even starts building. The purple wire has been disconnected by the prior owner for some reason. Only reason I can think of would be if he had a non lockup in here. If the solenoid was bad, I dont see why he would pull that wire out. At 70mph, Im at about 2200rpm going downhill and about 2800 going uphill. I dont believe the tranny is slipping. It shifts very firm.
Lou Czarnota said that he has run many turbo regals with non lockup convertors, and none of them got less than 19mpg. How much of a mileage difference have you guys seen with the lockup?
I havent had the plenum off to look inside yet, but I was told that the heads had been ported and it had a small cam. The engine doesnt really idle like it has a cam though. Regardless, it obviously doesnt have enough overlap to affect vacuum (18"), or cause a lopey idle. Perhaps whoever ported the heads ****ed them up to the point they flow much worse than stock. Ive seen this happen. But, like I said, I barely have to give it any gas to get the car moving and keep it moving.
It runs really strong under boost.
The prior owner hosed the wastegate up in a weird way, but it does work.
There is no water in the oil or vice versa. The oil is kind of old though. Like 5000 miles old. This never killed my mileage on any prior cars.
I know you guys are sick of hearing this, but please help.