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SVT Shelby GT500
Rough idle -getting worse over time
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<blockquote data-quote="XP900" data-source="post: 16927967" data-attributes="member: 199546"><p>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. </p><p></p><p>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). </p><p></p><p>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. </p><p></p><p>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?</p><p></p><p>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.</p><p></p><p>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?</p><p></p><p>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. </p><p></p><p>Thanks</p></blockquote><p></p>
[QUOTE="XP900, post: 16927967, member: 199546"] 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 [/QUOTE]
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Rough idle -getting worse over time
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