100% b2 ltft

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Jan 18, 2011 | 10:14 PM

firebird446

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From: KENTUCKY

100% b2 ltft

i have a buddy with a 1998 z28 with 5.3 heads #206, CC 273XFI, typhoon intake and 85mm TB, pacesetter midtubes. we been tuning it just fine then one day the B2 LTFT is bottomed out -100% so im like wow looked at o2 voltage and its still moving like normal and car runs like a turd, ive tried reseting the fuel trims via hp tuners and it wont even move a bit off -100. then i tried to do it while the cars not running/key on and still nothing.

any help would be awesome, im leaning towards ecm messed up....

Last edited by firebird446; Jan 18, 2011 at 11:53 PM. Reason: clarify not running/ with key on

Jan 18, 2011 | 11:13 PM

salemetro

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Quote:

Originally Posted by firebird446

i have a buddy with a 1998 z28 with 5.3 heads #206, CC 273XFI, typhoon intake and 85mm TB, pacesetter midtubes. we been tuning it just fine then one day the B2 LTFT is bottomed out -100% so im like wow looked at o2 voltage and its still moving like normal and car runs like a turd, ive tried reseting the fuel trims via hp tuners and it wont even move a bit off -100. then i tried to do it while the cars not running and still nothing.

any help would be awesome, im leaning towards ecm messed up....

Dead injector on bank 2?

Jan 18, 2011 | 11:47 PM

firebird446

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I wish it was that easy done checked all injectors. I should still be able to reset trims and be zero once again but it don't. I checked for intake leaks around gaskets, TB, intake boot, maf, exhaust leaks and nothing found.

Jan 19, 2011 | 09:23 AM

jimmyblue

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That's a PCM brain-fart value, LTFTs peg at +/-25% and
throw a too-rich or too-lean code if it's a real, sustained
mixture error.

Jan 19, 2011 | 04:46 PM

Matt@SNLPerformance

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You can't log many PIDs on the 98 computer as you can on the 99+ computers. Try logging less than 23 and see if you get a normal reading from it.

Jan 19, 2011 | 08:59 PM

firebird446

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I did that and noticed I was at 25 PIDS and you was right I backed it down too 24 and now its logging just fine.

Thanks a million he was about to order a new ecu.

I have a 99 ws6 and it let's me log more just didn't realize that 98 were that much lower

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