I have a 2010 GT500 with the VMP Gen2R kit, dual pump boosters, 69mm VMP twin jet, JLT 123mm, VMP triple HE, and a few other things. The Injectors are the Deatschwerks 95b/hr (1000cc). Dyno was about 635 hp / 635 torque when last done - tuned for 93 and only use 93. I was going to have this re-tuned but can't until I solve some issues I have with this -idling being the first one.
The idle is getting worse to the point I almost think it may stall at lights at times. When I stop it idles down okay to about 800 or so and seems smooth but it starts missing and I can feel it in the body..with the idle jumping around sometimes hitting down to 600. I can hear it mssing too at the back of the car at the pipes. It also tends to be very jerky at times between 1000-2000, intermittent but also seems to be getting worse with each long drive. I have changed plug coils even though they only showed a few misfires per coil. I also tried now plugs gapped at .30-.031and it made no difference withthe idling issue. (BR7EF tried and new TR7IX put back in - no improvement).
I checked all fittings and removed and cleaned the air flow sensor and throttle body with no improvement. I did a smoke test on the top with everything attached and plugged the end of the CAI at the cleaner end. I put a few lbs of pressure on it and found no leaks anywhere...removed the fill cap and verified there was a lot of smoke getting into the top. At idle my mechanical vac gauge reads steady between 20-21.
No engine checks, no codes when I used a scanner. I have a somewhat cheap $200 CRp129 scanner but it does seem to be able to pull and graph a lot of data but didn't see any thing flagged when I viewed info without it running. Need to redo with engine idling but not sure what parms to look at - injector values?
I'm thinking that maybe the injectors are failing or clogged since I have probably 25K on them - I use Techron once in a while. Will change the fuel filter too since it't been a few years.
Should I pull the injectors and have them cleaned by a service or do it myself ? Any reason to keep track of which cylinder they come from?
Lastly - do I need to pull the Gen2R to get at the drivers side fuel rail bolts to pull the injectors? Been a while since I had the SC off.
Thanks
The idle is getting worse to the point I almost think it may stall at lights at times. When I stop it idles down okay to about 800 or so and seems smooth but it starts missing and I can feel it in the body..with the idle jumping around sometimes hitting down to 600. I can hear it mssing too at the back of the car at the pipes. It also tends to be very jerky at times between 1000-2000, intermittent but also seems to be getting worse with each long drive. I have changed plug coils even though they only showed a few misfires per coil. I also tried now plugs gapped at .30-.031and it made no difference withthe idling issue. (BR7EF tried and new TR7IX put back in - no improvement).
I checked all fittings and removed and cleaned the air flow sensor and throttle body with no improvement. I did a smoke test on the top with everything attached and plugged the end of the CAI at the cleaner end. I put a few lbs of pressure on it and found no leaks anywhere...removed the fill cap and verified there was a lot of smoke getting into the top. At idle my mechanical vac gauge reads steady between 20-21.
No engine checks, no codes when I used a scanner. I have a somewhat cheap $200 CRp129 scanner but it does seem to be able to pull and graph a lot of data but didn't see any thing flagged when I viewed info without it running. Need to redo with engine idling but not sure what parms to look at - injector values?
I'm thinking that maybe the injectors are failing or clogged since I have probably 25K on them - I use Techron once in a while. Will change the fuel filter too since it't been a few years.
Should I pull the injectors and have them cleaned by a service or do it myself ? Any reason to keep track of which cylinder they come from?
Lastly - do I need to pull the Gen2R to get at the drivers side fuel rail bolts to pull the injectors? Been a while since I had the SC off.
Thanks
