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Sputtering and hesitating

Old 07-16-2008, 10:50 PM
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Default Sputtering and hesitating

well i got tuned this past saturday and as of monday my car started acting up the car would sputter and hesitate under boost
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Old 07-16-2008, 10:51 PM
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AFR? Which EMS?
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Old 07-17-2008, 12:26 AM
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AEM F/IC and i dont have a wideband but its on the way as we speak
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Old 07-17-2008, 03:40 AM
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Just curious does it get really rich (down to 10-11.5 afr) and sputter around 2krpm when under vacuum and partial acceleration? DOnt really understand this but i dont know if youd ever see this on a dyno tune - i had to pull fuel in this range to fix it, now it works great after a little tweaking
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Old 07-17-2008, 03:49 AM
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he probably won't know until he gets his gauge.

you're afr's are probably around 10.0 or lower and you are running really rich. past 2k rpm how is the car?
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Old 07-17-2008, 09:48 AM
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take out a spark plug.. takea pic of the tip and post it
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Old 07-17-2008, 10:27 AM
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I'd bet one of your pipes on the boost side has come loose.
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Old 07-17-2008, 02:54 PM
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pull the plugs and they are still good ... its my fuel map its running rich in boost and partial acc. it was doing this on the dyno but i thought the tuner would have fix it.
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Old 07-17-2008, 05:22 PM
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what was the a/f you were getting while on the dyno then?
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Old 07-17-2008, 05:24 PM
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to be honest im not real sure but i wanna say 11.5
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Old 07-17-2008, 07:48 PM
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whats vacuum at during idle
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Old 07-17-2008, 07:57 PM
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This happens sometimes after a dyno tune, it is probably running rich, get that AFR gauge installed.
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Old 07-17-2008, 08:07 PM
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Originally Posted by guttedtc0
whats vacuum at during idle
20 but my car seems to have hiccups and im running ngk 7s but on the stock gap cause autoparts store have no idea what a feeler gap is
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Old 07-17-2008, 08:08 PM
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Originally Posted by garabaldy
This happens sometimes after a dyno tune, it is probably running rich, get that AFR gauge installed.
it should be here friday so ill get it installed and post up the readings..
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Old 07-17-2008, 08:22 PM
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Originally Posted by NA_TC_817
Originally Posted by guttedtc0
whats vacuum at during idle
20 but my car seems to have hiccups and im running ngk 7s but on the stock gap cause autoparts store have no idea what a feeler gap is
Did you buy the one with "-11" at the end of the model number? If so your gap is .44.

If you didn't, then we don't know what your gap is.. but the gap could be your issue.
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Old 07-17-2008, 08:49 PM
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Just curious what should our plugs be gapped to? .040? Im using ngk iridium's that are -11 so theyre .044 stock i believe
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Old 07-17-2008, 11:03 PM
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Originally Posted by B_Real45
Originally Posted by NA_TC_817
Originally Posted by guttedtc0
whats vacuum at during idle
20 but my car seems to have hiccups and im running ngk 7s but on the stock gap cause autoparts store have no idea what a feeler gap is
Did you buy the one with "-11" at the end of the model number? If so your gap is .44.

If you didn't, then we don't know what your gap is.. but the gap could be your issue.
i got the ngk B K R 7 E I X -11
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Old 07-18-2008, 12:06 AM
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Okay - try making a smaller gap.. try .35 first.
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Old 07-18-2008, 12:34 AM
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i dont have a gap tool and i know using a slider gap tool isn't very smart for iridiums .. and part stores around my area dont have a clue about the tool i would need
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Old 07-18-2008, 12:47 AM
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If you want, go out and buy regular copper plugs in 7 heat range and gap them down.
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