90 GSX
15+ Year Contributor
- 322
- 2
- Jun 24, 2004
-
Fremont,
California
Okay basically, even with the timing adjustment plug grounded, my timing hovers around 5* then the timing light will have a slight pause and the timing will jump momentarily to 10 or 0 (not at 5). It's some sort of ignition miss, what could cause that? I did a conversion to the 91 ignition system and ECU but as far as I know it's all done correctly.
The car drives good, I get about 19-20 inches of Hg at idle. I mean I jsut don't understand this issue. I also have a problem where the car idles anywhere from 800-1000, not surging, just alternating randomly kind of. It's supposed to idle at 800 (stock gvr4 idle), that's how I burnt the chip because I'm using a gvr4 switchable tranny. It's weird... also, when you are driving and coming to a stop, the idle is supposed to stay up and then drop down when you stop moving, but that mechanism does work on my car. Idle switch works too, so it's not that. Another problem is that my fuel trims are out of wack. They indicate the car is dangerously lean. My low and high trims are at 115-120% and my medium trim is at 110%. No explanation for that either. Also, under any boost over about 3 psi I get knock which increases proportionally with the boost until I get about 25 counts at 11 psi (full boost right now).
This may be the weirdest problem yet... after the car has been running, if I shut it down and restart it, the idle drops to like 500 until I start driving the idle will eventually find itself, or rather it will go back up to between 800-1000 like I said in the first paragraph. When i searched I found other people with this problem but no answers.
Also, last problem... my car vibrates past 3500 rpm. It's not just AT 3500, it's past 3500 and it shakes up the downpipe heatshield and whatnought, I'm thinking it could cause phantom knock, but that does not explain my fuel trims...
Anybody care to give it a try? I'm really desperate to get rid of these problems, I can feel the car it wants to pull really hard but with all that knock my timing goes to shit under any real boost. I can't figure it out for the life of me, I mean I really took care when I built this car.
The car drives good, I get about 19-20 inches of Hg at idle. I mean I jsut don't understand this issue. I also have a problem where the car idles anywhere from 800-1000, not surging, just alternating randomly kind of. It's supposed to idle at 800 (stock gvr4 idle), that's how I burnt the chip because I'm using a gvr4 switchable tranny. It's weird... also, when you are driving and coming to a stop, the idle is supposed to stay up and then drop down when you stop moving, but that mechanism does work on my car. Idle switch works too, so it's not that. Another problem is that my fuel trims are out of wack. They indicate the car is dangerously lean. My low and high trims are at 115-120% and my medium trim is at 110%. No explanation for that either. Also, under any boost over about 3 psi I get knock which increases proportionally with the boost until I get about 25 counts at 11 psi (full boost right now).
This may be the weirdest problem yet... after the car has been running, if I shut it down and restart it, the idle drops to like 500 until I start driving the idle will eventually find itself, or rather it will go back up to between 800-1000 like I said in the first paragraph. When i searched I found other people with this problem but no answers.
Also, last problem... my car vibrates past 3500 rpm. It's not just AT 3500, it's past 3500 and it shakes up the downpipe heatshield and whatnought, I'm thinking it could cause phantom knock, but that does not explain my fuel trims...
Anybody care to give it a try? I'm really desperate to get rid of these problems, I can feel the car it wants to pull really hard but with all that knock my timing goes to shit under any real boost. I can't figure it out for the life of me, I mean I really took care when I built this car.
