Car Stutters @ WOT 3k-5krpm
08-12-2006, 01:21 PM
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Car Stutters @ WOT 3k-5krpm F14 232/234 Cam, Stock Heads, Dual Springs, Hardened PRs and Bolt-Ons
This started about a couple months ago. As far as tuning goes, the VE table is dialed in, -3 to -1 on the trims. Timing is as commanded. O2s are 890-910 @ wot. No symptoms show up in a scan, but I can hear it cutting out at midrange RPMs. I recently replaced spark plugs and wires as well.
What could this be a symptom of (mechanically). Would a bad valve, bent PR, etc have those kind of effects? Bad Coil Pack?
This started about a couple months ago. As far as tuning goes, the VE table is dialed in, -3 to -1 on the trims. Timing is as commanded. O2s are 890-910 @ wot. No symptoms show up in a scan, but I can hear it cutting out at midrange RPMs. I recently replaced spark plugs and wires as well.
What could this be a symptom of (mechanically). Would a bad valve, bent PR, etc have those kind of effects? Bad Coil Pack?
08-12-2006, 02:51 PM
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Timing:
3200: 29
3600: 28
4000: 25
4400: 24
4800: 23
5200: 26
5600+: 28
I don't have a wideband, but my PE Mult in the problem area is 1.17, O2s reading around 900.
It picks back up right at 5200rpm and pulls great to 6800.
3200: 29
3600: 28
4000: 25
4400: 24
4800: 23
5200: 26
5600+: 28
I don't have a wideband, but my PE Mult in the problem area is 1.17, O2s reading around 900.
It picks back up right at 5200rpm and pulls great to 6800.
08-12-2006, 04:45 PM
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I decided to mess with the timing in the areas that were low, bumped it up to 28deg from 4k to 5.2k and there is no more hesitation.
I never checked the tranny as it was a popping sound, likely a fueling issue when I first started noticing it.
I never checked the tranny as it was a popping sound, likely a fueling issue when I first started noticing it.
