tabasco122
06-24-2011, 08:19 AM
Ok, so i tried searching this site and others, i couldnt find anything anywhere that matched what issue im having, so if you find something, please feel free to berate me lol.
So I drove 900 miles from Louisiana to Indianapoilis for the 3000GT/Dodge Stealth National Gathering. I dont own a 3s anymore, but im still friends with all of the people and i go to the gatherings. Upon pulling into the parking lot of the hotel (after a 14 hour drive, pretty much straight), my car started surging really bad. At idle it goes from 2500rpms and drops down to 1500 then drops back down again. It does this constantly.
Things i have tried.
1. boost/vac leak test. Made a tester from pvc and stuff from lowes, pressurized the system, found a leak, fixed it, still no change.
2. unplugged the tps
3. ordered and bought a new tps from oreilly (97 200sx)
4. unplugged the maf
5. unplugged iacv
6. pulled codes (came back 55, all clear)
7. Hooked it up to NDS to see if i can see anything strange, nothing.
The funny thing is that it looks like the ECU is turning off the injectors, causing it to go full lean (21.8 AFR) thats when the idle drops down from 2500-1500, then the ecu starts firing the injectors again once it gets down to 1500. so basically the afr just keeps on bouncing between high 14's and full lean.
One more thing im going to try is plugging the IACV and the hole where it goes in the intake pipe and seeing if that changes anything, if it does then its probably just a broken iacv, but unplugging it did nothing.
So I drove 900 miles from Louisiana to Indianapoilis for the 3000GT/Dodge Stealth National Gathering. I dont own a 3s anymore, but im still friends with all of the people and i go to the gatherings. Upon pulling into the parking lot of the hotel (after a 14 hour drive, pretty much straight), my car started surging really bad. At idle it goes from 2500rpms and drops down to 1500 then drops back down again. It does this constantly.
Things i have tried.
1. boost/vac leak test. Made a tester from pvc and stuff from lowes, pressurized the system, found a leak, fixed it, still no change.
2. unplugged the tps
3. ordered and bought a new tps from oreilly (97 200sx)
4. unplugged the maf
5. unplugged iacv
6. pulled codes (came back 55, all clear)
7. Hooked it up to NDS to see if i can see anything strange, nothing.
The funny thing is that it looks like the ECU is turning off the injectors, causing it to go full lean (21.8 AFR) thats when the idle drops down from 2500-1500, then the ecu starts firing the injectors again once it gets down to 1500. so basically the afr just keeps on bouncing between high 14's and full lean.
One more thing im going to try is plugging the IACV and the hole where it goes in the intake pipe and seeing if that changes anything, if it does then its probably just a broken iacv, but unplugging it did nothing.