xhaust50
15+ Year Contributor
- 161
- 4
- Jun 27, 2004
-
Long Island,
New York
I bought a 90GSX a few months ago but haven't gotten it on the road yet. On the road test and the ride home it drove fine, and idled okay (stable) but sounded a little broken up. I figured it was the chip (burnt by a honda tuner with no ability to adjust below 1000rpm's).
Relevant Mods:
2G MAS
550 Injectors
Big 16G Turbo
255lph Fuel Pump
After sitting a few months I had a hard time trying to move the car in and out of the garage. When I went to give it gas it would stutter (if below 1000 rpm's) and then either pick up or die. Figured it was the chip. I just swapped a new chip from DSMchips with the relevant mods, and the car will rev fine but it won't hold an idle. It will idle flawlessly for 7 seconds, and then it will either die or completely stumble at 500rpms and the vacuum drops to -9 (held vacuum at -18 for that first few seconds). The fuel pressure is also at 43 during this (not sure where it should be and don't have an AFPR, just a gauge). I plan on doing an SAFC and an AFPR but wanted to get it running right first. However, I'm not sure if not having these is causing the problem. I doubt it though.
I don't know if a vacuum leak is causing the car to stumble, or if the low vacuum is being caused by the car stumbling. The vacuum seems normal (-20 ish) if I hold it at a certain RPM. Would it leak under this type of throttle too? I was at the garage by myself so I couldn't check for vacuum leaks with the car idling because it wouldn't stay idling. I think I'm going to end up paying someone to take a look at it because I can't move it out of my garage, and I'm really busy with testing and interviews in the next few weeks. I just wanted to know some possible solutions, in case it may be something obvious, before having someone look at it. Also, it doesn't smoke or anything.
Relevant Mods:
2G MAS
550 Injectors
Big 16G Turbo
255lph Fuel Pump
After sitting a few months I had a hard time trying to move the car in and out of the garage. When I went to give it gas it would stutter (if below 1000 rpm's) and then either pick up or die. Figured it was the chip. I just swapped a new chip from DSMchips with the relevant mods, and the car will rev fine but it won't hold an idle. It will idle flawlessly for 7 seconds, and then it will either die or completely stumble at 500rpms and the vacuum drops to -9 (held vacuum at -18 for that first few seconds). The fuel pressure is also at 43 during this (not sure where it should be and don't have an AFPR, just a gauge). I plan on doing an SAFC and an AFPR but wanted to get it running right first. However, I'm not sure if not having these is causing the problem. I doubt it though.
I don't know if a vacuum leak is causing the car to stumble, or if the low vacuum is being caused by the car stumbling. The vacuum seems normal (-20 ish) if I hold it at a certain RPM. Would it leak under this type of throttle too? I was at the garage by myself so I couldn't check for vacuum leaks with the car idling because it wouldn't stay idling. I think I'm going to end up paying someone to take a look at it because I can't move it out of my garage, and I'm really busy with testing and interviews in the next few weeks. I just wanted to know some possible solutions, in case it may be something obvious, before having someone look at it. Also, it doesn't smoke or anything.
