05-07-2008, 10:13 PM
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#2835 (permalink)
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Verified Seller
Join Date: Jul 2007
Location: stoughton
Drives: with MR gears
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Re: ---===The Official MAFT-Pro Thread===---
Quote:
Originally Posted by UCSB VR4
New problem:
Sometimes after the car is completely warmed up, I think the ECU is getting stuck in closed loop mode when at idle. When this happens, the afr goes to 13.0 and sticks there no matter what. Any/all changes I make to the Maft Pro have no affect. I've verified this by changing the mainscale by + or - 30%, having no effect whatsoever on the AFR readings.
I have both my stock O2 sensors UNPLUGGED, so, how is the ECU going into closed loop mode when at idle? How can I resolve this issue? I absolutely need to figure this out if I stand a chance at passing smog!
Please any advice is greatly appreciated. I'd rather not plug the stock O2 sensors back in just yet as I feel the stock low fuel trim adjustments are too drastic and cause cycling rich/lean conditions at idle. I'd rather let pt tracking and the wideband make all the fuel adjustments at idle. How can I get the ECU stuck in open loop mode at idle such that maftpro adjustments affect the resulting AFR???
- Jeff
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i have the same thing going on. my idle is so out of wack between lean/rich, stalling. anything i try to do doesnt seem to do anything.i also have a CEL on with no code? i
ill post my setting under this post.
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 94 VR4
99 conversion with 6K HIDs and PIAA fogs, DN downpipe, SAFC, 450cc, walbro 255lph hotwired, Greddy profec @17psi, MR gears, RPS 6-puck clutch, fidanza flywheel, hybrid logger, dejon preturbo, MAFT 2.xx W/lt1 3inch blow throw. K&N and custon carbon fiber heat sheild, HKS ssq, blitz turbo timer, 18" TSW kyalamis wraped in proxy 4's, polished Y-pipe, polished strut bar, seattle short throw, vac line reduction, misc REAL carbon fiber trim and misc gauges..ect
ON THE WAY: FMIC, 15G/17G combo, MAFT-PRO, 560cc, Solid engine mounts, full 120K, Custom catback exhaust,Carputer, and brake upgrade. |
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