injector bank issue

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Jul 31, 2010 | 12:37 PM

fmowry

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From: Baltimore, MD

injector bank issue

I've got an LS6 swap in an Miata controlled by an '04 GTO PCM with a vanilla mailorder tune to delete the basics. I figured I'd pick up HPtuners to see what the hell is going on.

The problem is the bank 2 02 drops down to zero and ST goes through the roof while the bank 1 02 gets pegged.

I checked for spark and the coil packs look OK. I decided to pull the injector clips one at a time and if I pull a clip on either side and then reconnect it the problem seems to fix itself, at least for a while.

Attached is the *.hpl showing the whacked out 02 and fuel trims and then showing them settle down when any injector is disconnected then reconnected.

Any ideas? Bad injectors? Should I swap bank 1 injectors for bank 2 injectors and see if the problem switches sides?

Thanks,
Frank

Attached Files

o2 games.hpl (87.5 KB, 92 views)

Jul 31, 2010 | 03:50 PM

fmowry

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Swapping bank 1 injectors with bank 2 injectors did nothing.

Jul 31, 2010 | 04:56 PM

Old Geezer

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Engine been sitting for an extended period of time, B4 U started it??
If so, injs could be gummed up..I see this frequently, when I clean/flow injs for the local j/y....

Jul 31, 2010 | 05:02 PM

fmowry

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It has. But wouldn't swapping the all 4 pax injectors to driver side and having the same issue with the pax O2 indicate it's not an injector issue?

Jul 31, 2010 | 10:11 PM

Bird

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Sounds like maybe you have the O2 sensors plugged opposite - swap them at the plugs and your problem should go away.

Bird

Jul 31, 2010 | 10:35 PM

fmowry

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I think I see what you mean. Swap the actual plug wiring on the same side. Will try.

I did replace an O2s before from an OEM from Denso to a univeral where I had to wire in the plug. But after I swapped them side to side there was no difference.

Rockauto has denso OEMs with plug at 37 so I'll pick up a couple just to have and try but I doubt this is the issue.

Frank

Last edited by fmowry; Aug 1, 2010 at 11:04 AM. Reason: drunk posting didn't make sense.