Flash PCM's staying in Closed Loop fuelling...

Holden/Delco Tuning. ALDL, OBD 1.5. Circa 1989 to 2004.
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VX L67 Getrag
Posts: 2883
Joined: Sun Aug 02, 2009 9:16 pm
Location: Bayside, Melbourne, Victoria
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Flash PCM's staying in Closed Loop fuelling...

Post by VX L67 Getrag »

Hey All,

As the topic suggests I had this problem(that someone else told me about months ago & I posted it here), now it's happen to me!

I had it tuning on the dyno fine last night & just made simple timing changes & raised the knock enable coolant & changed BPW to suit & while I did this I diss-connected the battery.

Since re-connecting the battery & then flash in the new cal only & now can't get it out of closed loop at any time(dangerously lean under load)LOL.

It's a bit strange as I've flashed in the older tunes that were working fine(before disconnecting the battery) & when watching the log it does actually command the 12.8 for a split second & then goes back to 14.7!

Has anyone else struck this?

Cheers VX L67 Getrag
VX L67 Getrag
Posts: 2883
Joined: Sun Aug 02, 2009 9:16 pm
Location: Bayside, Melbourne, Victoria
Contact:

Re: Flash PCM's staying in Closed Loop fuelling...

Post by VX L67 Getrag »

Turn's out this what actually a scalar that if in 4th gear delays for 6 seconds I think, so you can zero the delay or change the gear from 4 to 5 or similar!

Makes sense as the 1st few tests I did on the dyno were in 3rd gear & as it's a manual it should have been 4th for drive line ratio closer!

Cheers VX L67 Getrag
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