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Old 08-05-2014, 02:21 AM   #1
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Default Pops and Bangs on initial startup

Hi, Very happy to be at this point now as I tried starting the car this evening. I can't get much more than a few pops and bangs - seems like backfires so I'm wondering if my timing could be to blame. Newbie - so go easy I've not done this before - I've attached my Data log. Rpms are synced nicely.

1994 block, 1.8 with 2003 VVT head
MS3X with 36-2 crank, VVT cam sensor
LS2 coils sequential run from MS3X
Batch injection run from main, stock 265cc miata injectors

Thanks for ideas on what to try next.
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File Type: msl 2014-08-05_00.44.35.msl (22.2 KB, 28 views)
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Old 08-05-2014, 02:42 AM   #2
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Here is the current tune
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File Type: msq CurrentTune.msq (222.9 KB, 29 views)
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Old 08-05-2014, 08:24 AM   #3
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typical that means too much fuel, but it typically also doesn't start when it's flooding like that.

I dunno what are you showing in that log, it's like 4 secs long.
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Old 08-05-2014, 01:58 PM   #4
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Yup, couldn't get it to "run" much longer than that... I think my spark may be too advanced (was 20deg @ 750rpm) and then too retarded at higher loads so I've tweaked that. Battery was also getting a little tired last night and I heard that might mess some things up too...

I checked spark on #1 but not the others so I should also verify I'm getting all 4 working...Lots to do...Thanks for your help !
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Old 08-05-2014, 11:06 PM   #5
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Default Better but still not great

OK, so I checked all sparks - look nice. Running sequential so can't test individual injectors. Revised timing and managed to coax the car to run while blipping the throttle - so I have a couple of log longer than 10 secs now....also adjust VE table to remove some fuel, but noticed AFR was in the low 20s at 2000rpm, so I think more work to do here....Anyhow, here are the new logs and new basemap.

Car is still popping and running really rough - almost like a misfire....I'd be grateful for any wisdom anyone wanted to share.
Attached Files
File Type: msl 2014-08-05_21.38.54.msl (216.5 KB, 33 views)
File Type: msl 2014-08-05_21.24.11.msl (83.6 KB, 23 views)
File Type: msq CurrentTune.msq (222.9 KB, 33 views)

Last edited by TheV's; 08-05-2014 at 11:37 PM.
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Old 08-05-2014, 11:39 PM   #6
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Default Doh

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Originally Posted by TheV's View Post
OK, so I checked all sparks - look nice. Running sequential so can't test individual injectors. Revised timing and managed to coax the car to run while blipping the throttle - so I have a couple of log longer than 10 secs now....also adjust VE table to remove some fuel, but noticed AFR was in the low 20s at 2000rpm, so I think more work to do here....Anyhow, here are the new logs and new basemap.

Car is still popping and running really rough - almost like a misfire....I'd be grateful for any wisdom anyone wanted to share.
Gasp - just realized I've been running with "fixed timing" set - my spark is at 10 deg - no wonder it runz like crap ! - OK, that's embrasing
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