eclipsyco
10+ Year Contributor
- 582
- 16
- Nov 19, 2011
-
Somewhere in,
Central_America
Hi! been a while
So a got a 90 1g gsx last year it was running fine its just need a transmission car pretty much stock other than minor mods.
After the transmission swap car was running as usual afr was good, did a pull to feel out the trans all good until I came to a stop car was running weird didn't pay much attention since it still drives and didn't stall I noticed that the afr was a little leaner than normal high 15s almost 16s so i drove it easy back home then it sat for a few days since I didn't have the time to work on it.
This was a few months ago and now I'm fighting this issue where the car is very lean on idle only, high 17s same times 18s on the wideband and jerks (misfire) a lot if a try to rev it until a go past 3k rpm the afr goes back to normal.
I've owned a dsm for at least 10 years now I know my stuff around these cars plus I've been hording parts al these years.
Thinks I tried so far
BLT was number 1 thing to do it had a leak on the throttle body, seals were shot so I rebuild the throttle body new seals, gaskets, o-rings etc
Change spark plugs new bpr6es gap @ .28
Tried 3 different coil packs
Injectors 1g and 2g also a I have good fuel pressure (gauge on the line)
Compression test 152 across
Check timing mechanical and the CAS
MAF and o2 sensor
I did notice something weird tho, if I unplug any sensor while the car is running CEL will turn on except the o2 sensor, so this left me to believe it's probably a bad ECU.
if anyone have any input on this or any idea what else to check since this is stressing me out now and I don't have a spare 90s ecu
So a got a 90 1g gsx last year it was running fine its just need a transmission car pretty much stock other than minor mods.
After the transmission swap car was running as usual afr was good, did a pull to feel out the trans all good until I came to a stop car was running weird didn't pay much attention since it still drives and didn't stall I noticed that the afr was a little leaner than normal high 15s almost 16s so i drove it easy back home then it sat for a few days since I didn't have the time to work on it.
This was a few months ago and now I'm fighting this issue where the car is very lean on idle only, high 17s same times 18s on the wideband and jerks (misfire) a lot if a try to rev it until a go past 3k rpm the afr goes back to normal.
I've owned a dsm for at least 10 years now I know my stuff around these cars plus I've been hording parts al these years.
Thinks I tried so far
BLT was number 1 thing to do it had a leak on the throttle body, seals were shot so I rebuild the throttle body new seals, gaskets, o-rings etc
Change spark plugs new bpr6es gap @ .28
Tried 3 different coil packs
Injectors 1g and 2g also a I have good fuel pressure (gauge on the line)
Compression test 152 across
Check timing mechanical and the CAS
MAF and o2 sensor
I did notice something weird tho, if I unplug any sensor while the car is running CEL will turn on except the o2 sensor, so this left me to believe it's probably a bad ECU.
if anyone have any input on this or any idea what else to check since this is stressing me out now and I don't have a spare 90s ecu