90_GSX_DSM
10+ Year Contributor
- 112
- 3
- Nov 17, 2008
-
Fleetwood,
Pennsylvania
Alright guys the car is a 90 GSX. I had a pretty tough time getting the base timing to 5*BTDC. The CAS is maxxed out in the advanced position. I have Link so I'm positive I was doing this with the pin grounded. It was idleing a bit higher than 750, maybe around 850-900. Also double and triple checked to make sure the CAS wasn't 180* out. Also double and triple checked to make sure mechanical timing was on.
I recently had my head off because it threw a rocker. I had this issue before the head was off though. Also found out that my old crank pulley had spun about 2 inches on itself. Which made it impossible to set ignition timing. I got the new pulley and like I said I can get it to 5* btdc but the CAS is all the way advanced.
Last year was the last time I didn't have issues with the ignition timing or idle surge. I did change a lot of things over the winter that could affect the idle. I converted to a n/t style TB with the FIAV blocked off from throttlebodies.com. He says he tests all the sensors in the tb so I'm guessing the TPS and ISC are good. I tested the ohms on the ISC myself and it was good. Also got a new JMF intake.
I've been fighting this all year and it's kicking my ass. Car runs and pulls good minus the surge. I've looked time and time again for boost leaks but can't find any. When it starts to surge I can hear what sounds like a large vaccum leak coming from the tb but I can't pinpoint it. Idk if that's the isc opening up to compensate or what. If anyone has any input that would be awesome . Thanks!
I recently had my head off because it threw a rocker. I had this issue before the head was off though. Also found out that my old crank pulley had spun about 2 inches on itself. Which made it impossible to set ignition timing. I got the new pulley and like I said I can get it to 5* btdc but the CAS is all the way advanced.
Last year was the last time I didn't have issues with the ignition timing or idle surge. I did change a lot of things over the winter that could affect the idle. I converted to a n/t style TB with the FIAV blocked off from throttlebodies.com. He says he tests all the sensors in the tb so I'm guessing the TPS and ISC are good. I tested the ohms on the ISC myself and it was good. Also got a new JMF intake.
I've been fighting this all year and it's kicking my ass. Car runs and pulls good minus the surge. I've looked time and time again for boost leaks but can't find any. When it starts to surge I can hear what sounds like a large vaccum leak coming from the tb but I can't pinpoint it. Idk if that's the isc opening up to compensate or what. If anyone has any input that would be awesome . Thanks!