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Old 06-03-2017, 05:18 PM   #1
jv7
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car runs lean under boost

Car runs fine cruising around idles fine but above 3lbs of boost seems to run extremely lean it will start to backfire and sputter I think thats about the time the boost a pump is suppose to kick in other than than on fuel I'm running 80lb inj and Aeromotive 325lph fuel pump. I can rev it up to redline if I keep the boost at 3lbs or less but above that regardless of rpms seems lean. Could it be a bad bov? I have the vortech mondo. Thanks.

Last edited by jv7; 06-03-2017 at 06:50 PM.
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Old 06-03-2017, 05:23 PM   #2
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Re: car runs lean under boost

definitely not getting fuel for sure. I switched to full return style because of such issues with boost a pump. I would make sure that is working but with seeing some data log it would be hard to self diag
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Old 06-05-2017, 11:20 PM   #3
TKat13
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Re: car runs lean under boost

overly simple, but check your fuel filter.
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Old 06-09-2017, 03:29 PM   #4
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Re: car runs lean under boost

Already did that. Cleaned maf and kn filter no change.
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Old 06-09-2017, 03:55 PM   #5
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Re: car runs lean under boost

Is it lean or is it bad spark blow out?

Sounds like you need to get a wideband on there
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Old 06-10-2017, 12:48 PM   #6
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Re: car runs lean under boost

Id get a wideband right away to see how lean your going, then adjust from there with a handheld tuner. also check all the hoses for cracks and such, maybe there is air getting in there past the MAF. A fuel pressure gauge would help alot to to diagnose stuff too. At 3 psi i think the pump your running should be fine even without the BAP. If your running a off the shelf tune, id get it to a tuner and get a custom tune right away.

Gauges you should always have if your boosted.

A/F gauge
Fuel Press Gauge
Oil Press gauge
Boost/ Vac Gauge
Water temp gauge ( even if not boosted )
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Old 06-13-2017, 08:42 AM   #7
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Re: car runs lean under boost

What would cause spark blowout? It started happening around the time I changed my plugs.
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Old 06-13-2017, 08:52 AM   #8
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Re: car runs lean under boost

weak coils and/or plugs with too big of a gap. If they werent gapped tight enough for your boost level the misfiring/blowout may have fouled them since then
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Old 06-13-2017, 02:15 PM   #9
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Re: car runs lean under boost

I think it is spark blowout. I asked my mechanic who installed them if he gapped them at 32 and he said he thought I said 42. So you would suggest to get new plugs instead of regapping the ones I have now? I have a d1 with max 16lbs boost should I gap them lower then 32?
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Old 06-13-2017, 03:30 PM   #10
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Re: car runs lean under boost

if it was working at 32 before, Id leave em at 32. My understanding is you want to run the biggest gap possible without getting spark blowout to make the most power. As for new plugs its hard to say they might be fine. If youre just running NGKs or something @ $20 a set or less Id just buy new ones and be done with it personally
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Old 06-14-2017, 08:38 AM   #11
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Re: car runs lean under boost

Any plug recommendations? Ngk tr6 or tr55's?
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Old 06-14-2017, 10:27 AM   #12
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Re: car runs lean under boost

New Tr6 @ .028-.032 is what I would do. Maybe start at 28 and work your way more open until it blows out and then gap them down just a hair until it's not blowing out anymore. If that didn't fix it and the coils are still originals, id get a new set of gt500 coils from AM and use the reg discount and go from there. It's probably getting about time for these cars to do that anyways.
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Old 06-14-2017, 04:45 PM   #13
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Re: car runs lean under boost

Quote:
Originally Posted by 311-420 View Post
New Tr6 @ .028-.032 is what I would do. Maybe start at 28 and work your way more open until it blows out and then gap them down just a hair until it's not blowing out anymore. If that didn't fix it and the coils are still originals, id get a new set of gt500 coils from AM and use the reg discount and go from there. It's probably getting about time for these cars to do that anyways.
Get the FORD coils, don't waste your money on the other 'performance' brands.
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Track Times (bone-stock w/drs):60 ft - 1.90 | 1/8 - 8.67
(100 shot,E85,4:10s,Street tire):60 ft - 1.67 | 1/8 - 7.88
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Old 06-14-2017, 05:41 PM   #14
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Re: car runs lean under boost

Quote:
Originally Posted by TKat13 View Post
Get the FORD coils, don't waste your money on the other 'performance' brands.
Definitely
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Old 06-22-2017, 11:15 PM   #15
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Re: car runs lean under boost

Finally got the tr6's gapped correctly and the new fms coil packs and it runs great! Glad thats all it was I was thinking bad fuel pump, injectors or bap. Thanks for the replies.
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Old 06-23-2017, 08:51 AM   #16
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Re: car runs lean under boost

glad that was all it was.
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Old 06-23-2017, 10:08 AM   #17
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Re: car runs lean under boost

Good deal
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Old 07-03-2017, 12:12 PM   #18
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Re: car runs lean under boost

Love it when people post back what they did to resolve the issue. Thanks and Congrats.
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Black '04 Mach 1
Track Times (bone-stock w/drs):60 ft - 1.90 | 1/8 - 8.67
(100 shot,E85,4:10s,Street tire):60 ft - 1.67 | 1/8 - 7.88
New build - 750rwhp; not track tested (yet)
Mods: Build Log
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Old 07-03-2017, 12:50 PM   #19
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Re: car runs lean under boost

Quote:
Originally Posted by TKat13 View Post
Love it when people post back what they did to resolve the issue. Thanks and Congrats.
No doubt. Almost never happens though, unfortunately.
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