PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

Looking for some tuning help i think

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Old Oct 24, 2025 | 04:50 AM
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Afaat02's Avatar
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Default Looking for some tuning help i think

2002 ws6
5/8 headers
Pro charger D8 kit
84lb injectors

So I bought the car had the kit installed and tune as a package.


I'm getting a lot of backfiring. Accelerates great but on cruise speeds or slow down it just pops like crazy.

Any help will be appreciated
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Old Oct 24, 2025 | 09:54 AM
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Could be deceleration fuel cut off not being commanded or lack of timing in the light load/ deceleration cells of the timing tables. Either would be going back to the tuner and asking for a revision.
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Old Oct 24, 2025 | 01:09 PM
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Does it backfire if you drive at a steady speed on a flat road? I'm only asking because I'm pretty sure the tuner is going to ask.

If it's only doing it during deceleration, then it's probably fixable with the throttle-cracker and throttle-follower and fuel cutoff tables. But those only matter when you lift, they won't help if it's backfiring at a steady speed on a flat road.
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Old Oct 24, 2025 | 07:23 PM
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Originally Posted by NSFW
Does it backfire if you drive at a steady speed on a flat road? I'm only asking because I'm pretty sure the tuner is going to ask.

If it's only doing it during deceleration, then it's probably fixable with the throttle-cracker and throttle-follower and fuel cutoff tables. But those only matter when you lift, they won't help if it's backfiring at a steady speed on a flat road.
yes flat or uphill. Only time it doesn't is under acceleration.
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