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SVT Shelby GT500
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<blockquote data-quote="XP900" data-source="post: 16637181" data-attributes="member: 199546"><p>THANKS for all the info.</p><p></p><p>My car seemed to be having other issues too that I had just noticed last week....like loss of power / shuddering between 1k-2k. Almost like a miss or bog around 1.5K which also seemed to coincide with what I thought was a loss of boost. Since the temporary mechanical boost gauge showed pretty high boost at high rpm I'm thinking the lower rpm issue is what makes it feel like it is down on power. I yanked out my Aeroforce garbage and installed a Autometer mechanical boost for future testing. </p><p></p><p>I spent two days and pulled off the SC , injectors etc to check everything. Checked all hoses for leaks, vacuum pressure, bypass valve operation. Cleaned injectors, rails, intake, TB, PVC etc. Ran tank out and installed fresh Shell 93 V-power gas with new fuel filter. Swapped out coils with a spare set. Installed another set of Iridiums gapped at a larger .032" setting this time. Swapped out MAF, PVC valve, purge valve, fuel pressure valve, fuel filter, TPsensor with a spare set I had. </p><p></p><p>Put it all back together and tested. There are no codes coming up - ever. Anyway it is idling really nice but I still feel what seems like a bog / power loss between 1 and 2 K. Over 2K and it runs fine. </p><p></p><p>Not sure if datalogging can help but I am going to give it a shot since i haven't done it in two years. Also looking to see if I have another VMP throttle body to swap. I have to see my tuner in two+ weeks since he left some OBD tests tuned off when it was tuned last year. His tune ran fine for 6K but I am not ruling that out either. I miss the old easy days of carb tuning!</p></blockquote><p></p>
[QUOTE="XP900, post: 16637181, member: 199546"] THANKS for all the info. My car seemed to be having other issues too that I had just noticed last week....like loss of power / shuddering between 1k-2k. Almost like a miss or bog around 1.5K which also seemed to coincide with what I thought was a loss of boost. Since the temporary mechanical boost gauge showed pretty high boost at high rpm I'm thinking the lower rpm issue is what makes it feel like it is down on power. I yanked out my Aeroforce garbage and installed a Autometer mechanical boost for future testing. I spent two days and pulled off the SC , injectors etc to check everything. Checked all hoses for leaks, vacuum pressure, bypass valve operation. Cleaned injectors, rails, intake, TB, PVC etc. Ran tank out and installed fresh Shell 93 V-power gas with new fuel filter. Swapped out coils with a spare set. Installed another set of Iridiums gapped at a larger .032" setting this time. Swapped out MAF, PVC valve, purge valve, fuel pressure valve, fuel filter, TPsensor with a spare set I had. Put it all back together and tested. There are no codes coming up - ever. Anyway it is idling really nice but I still feel what seems like a bog / power loss between 1 and 2 K. Over 2K and it runs fine. Not sure if datalogging can help but I am going to give it a shot since i haven't done it in two years. Also looking to see if I have another VMP throttle body to swap. I have to see my tuner in two+ weeks since he left some OBD tests tuned off when it was tuned last year. His tune ran fine for 6K but I am not ruling that out either. I miss the old easy days of carb tuning! [/QUOTE]
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