Hi guys, it seems I'm always chasing some kind of problem with this car, but you guys always seem to help me out so here goes. Sorry if its long i've included any information I think will help diagnose the problem.
I recently installed 42 lb injectors with matched TT chip, Walbro fuel pump with hot wire kit, and the rjc power plate for the stock plenum. After those upgrades, I was still having problems with knock, but that was fixed once I found out the hose going to the waste gate solenoid was completely deteriorated. After that was fixed the car ran beautifully.
NOW, two weeks ago when I had the car out to stretch its legs since it sits while I'm away at school, it ran beautifully and built boost without any problems until I got home. When I was pulling it into the driveway I noticed a really rough idle all of a sudden. I went to take the car out again later to see if was just having a temperamental episode but when I got it on the road, it would just sputter and hesitate under normal throttle.
This seemed to resemble how the car would run when up pipe would blow off due to my shitty clamps. Noticing that none of them had blown off I thought that maybe one of the rubber hoses connecting turbo, intercooler, and plenum had cracked due to old age, and the boost under cold weather. They needed to be replaced so ordered news and got myself some T-bolt clamps.
Before I put the clamps and hoses on today I took it for a drive. It drove normally for a minute and built boost once, then I had to limp it home with it sputtering. After I got all of the hoses and clamps on, I started it and let it warm up to 160, revved it in park and it seemed fine. Took it for a drive, built boost once and then had to limp it back again. So obviously they didn't solve the problem and so I began trouble shooting.
Here's what I've tried so far:
cleaning the maf (the maf caused a similar problem on my old GN)
changed the waste gate solenoid (every time the car sputtered you could hear the turbo shudder so I thought maybe the waste gate wasn't closing all the way)
I also tried taking the line going to the solenoid off to see if it would run normally without anything regulating the boost. Still nothing.
It seems that when I start the car, I can rev it in park without any problems, but then when I drive it, it will build boost once and then start acting up, then when I get it home and rev it, it will continue to sputter.
Here are the scan master numbers once warmed up
O2 600
AF 05
L8 36
Bat 13.6
Int 128
BL 118
Clt 168
Ats 57
r 800
Tps .44 (idling) .42 (key on) 4.50 (WOT)
Iac 27
Mal 00
Im sure this has no effect, but my battery has been going dead from sitting in the cold. So I have to jump it and then it is fine.
I live in PA and it was about 43 degrees today.
Im all out of ideas of what could be wrong and of course I just read the hot rod magazine that says the rjc power plate is no good and the gaskets blow. Is this true? Maybe a vacuum leak is causing it? I don't have a boost gauge since my car is almost completely stock, but I plan on installing one within the next week.
Any help would be greatly appreciated,
Mike
I recently installed 42 lb injectors with matched TT chip, Walbro fuel pump with hot wire kit, and the rjc power plate for the stock plenum. After those upgrades, I was still having problems with knock, but that was fixed once I found out the hose going to the waste gate solenoid was completely deteriorated. After that was fixed the car ran beautifully.
NOW, two weeks ago when I had the car out to stretch its legs since it sits while I'm away at school, it ran beautifully and built boost without any problems until I got home. When I was pulling it into the driveway I noticed a really rough idle all of a sudden. I went to take the car out again later to see if was just having a temperamental episode but when I got it on the road, it would just sputter and hesitate under normal throttle.
This seemed to resemble how the car would run when up pipe would blow off due to my shitty clamps. Noticing that none of them had blown off I thought that maybe one of the rubber hoses connecting turbo, intercooler, and plenum had cracked due to old age, and the boost under cold weather. They needed to be replaced so ordered news and got myself some T-bolt clamps.
Before I put the clamps and hoses on today I took it for a drive. It drove normally for a minute and built boost once, then I had to limp it home with it sputtering. After I got all of the hoses and clamps on, I started it and let it warm up to 160, revved it in park and it seemed fine. Took it for a drive, built boost once and then had to limp it back again. So obviously they didn't solve the problem and so I began trouble shooting.
Here's what I've tried so far:
cleaning the maf (the maf caused a similar problem on my old GN)
changed the waste gate solenoid (every time the car sputtered you could hear the turbo shudder so I thought maybe the waste gate wasn't closing all the way)
I also tried taking the line going to the solenoid off to see if it would run normally without anything regulating the boost. Still nothing.
It seems that when I start the car, I can rev it in park without any problems, but then when I drive it, it will build boost once and then start acting up, then when I get it home and rev it, it will continue to sputter.
Here are the scan master numbers once warmed up
O2 600
AF 05
L8 36
Bat 13.6
Int 128
BL 118
Clt 168
Ats 57
r 800
Tps .44 (idling) .42 (key on) 4.50 (WOT)
Iac 27
Mal 00
Im sure this has no effect, but my battery has been going dead from sitting in the cold. So I have to jump it and then it is fine.
I live in PA and it was about 43 degrees today.
Im all out of ideas of what could be wrong and of course I just read the hot rod magazine that says the rjc power plate is no good and the gaskets blow. Is this true? Maybe a vacuum leak is causing it? I don't have a boost gauge since my car is almost completely stock, but I plan on installing one within the next week.
Any help would be greatly appreciated,
Mike