randman2011
10+ Year Contributor
- 552
- 282
- Feb 26, 2012
-
Indianapolis,
Indiana
I recently resurrected my GSX after months of being disassembled only to find that it doesn't run properly. The assembly was pretty standard with the only changes from the previous configuration being 9:1 compression and 1000cc Deatschwerks injectors. The E3 16G is running wastegate pressure. I was expecting the car to start and idle without issue and I could jump into tuning, but that has not been the case.
Compression is 165-170 across all four cylinders. Spark has been verified on all four cylinders. The tune is unchanged from a known good state with the exception of injector scaling and voltage compensation values taken from Deatschwerks.
The wideband registers 35-100:1 at idle and this is accompanied by a rough idle with poor throttle response. Above around 2000 RPM the engine smooths out and throttle response is actually really good. At WOT the AFR drops all the way to 7.0:1 and the engine fails to make significant power. I unplugged each injector in succession and found that disabling cylinder 3's injector had no effect on the idle. That is where I left the investigation last night.
Does anyone know what might cause these symptoms? I am wondering if that injector is clogged in some way, preventing cylinder 3 from igniting or getting any fuel at all, but that wouldn't explain how it manages to drop to 7.0:1 AFR at WOT.
I intend to swap injectors between the cylinders when I get home today to see if the problem follows the injector, but that's as much as I have come up with to troubleshoot. Is there a way to clean injectors myself just in case this brand new injector is somehow clogged?
Compression is 165-170 across all four cylinders. Spark has been verified on all four cylinders. The tune is unchanged from a known good state with the exception of injector scaling and voltage compensation values taken from Deatschwerks.
The wideband registers 35-100:1 at idle and this is accompanied by a rough idle with poor throttle response. Above around 2000 RPM the engine smooths out and throttle response is actually really good. At WOT the AFR drops all the way to 7.0:1 and the engine fails to make significant power. I unplugged each injector in succession and found that disabling cylinder 3's injector had no effect on the idle. That is where I left the investigation last night.
Does anyone know what might cause these symptoms? I am wondering if that injector is clogged in some way, preventing cylinder 3 from igniting or getting any fuel at all, but that wouldn't explain how it manages to drop to 7.0:1 AFR at WOT.
I intend to swap injectors between the cylinders when I get home today to see if the problem follows the injector, but that's as much as I have come up with to troubleshoot. Is there a way to clean injectors myself just in case this brand new injector is somehow clogged?