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 6Likes
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3
Post By Modena
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1
Post By Gav
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1
Post By Treeve
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1
Post By sjelby
12-29-2016, 04:06 AM
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CC Member
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Join Date: May 2010
Location: Golden Square,
Posts: 161
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Not Ranked
Long term fuel trim in LS1
My problem is the long term fuel trim changes when the engine is off and I depress the accelerator.
Any one have any ideas?
Stan.
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12-29-2016, 06:42 AM
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CC Member
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Join Date: Mar 2005
Location: Perth,
wa
Cobra Make, Engine: Pace Alumina 427 #69
Posts: 1,615
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Not Ranked
get the ecu flashed and turn the LT fuel trim off
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RF12 414 Windsor 8 stack ,6spd, Avons
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12-29-2016, 04:34 PM
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CC Member
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Join Date: Apr 2006
Location: Mildura,
vic
Cobra Make, Engine: FFR Coupe, 416ci of LS goodness
Posts: 2,349
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Not Ranked
Not sure what you mean Stan?
Are you having issues when the car has not been ran for a while?
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12-29-2016, 05:30 PM
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CC Member
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Join Date: May 2010
Location: Golden Square,
Posts: 161
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I had the ecu done to start mafless , it starts fine, I have it at the tuners and he is getting it running properly before it get put on the dyno.
His msg to me was,
I have ti find out why the long term fuel trims change without the engine running when I depress the accelerator.
Got me stumped, I'ma bricky .
Stan.
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12-30-2016, 02:49 AM
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CC Member
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Join Date: Nov 2009
Location: Cheltenham,
Vic
Cobra Make, Engine: Classic Revival CR3516, LS3, Aussie Mike'd T-56, 3.70 LSD, AP brakes, Penske shocks
Posts: 1,616
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Not Ranked
If he says that and asks you to find out why, get a new tuner!
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Ben in AU
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12-30-2016, 04:32 AM
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CC Member
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Join Date: Apr 2006
Location: Mildura,
vic
Cobra Make, Engine: FFR Coupe, 416ci of LS goodness
Posts: 2,349
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Not Ranked
Ditto to the above.
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12-30-2016, 02:22 PM
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CC Member
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Join Date: May 2011
Cobra Make, Engine: Gardner Doulgas
Posts: 47
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Not Ranked
No leaking fuel injectors or air leak ?
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12-30-2016, 02:56 PM
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CC Member
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Join Date: Dec 2000
Cobra Make, Engine:
Posts: 305
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Not Ranked
Quote:
Originally Posted by Modena
If he says that and asks you to find out why, get a new tuner!
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Ditto!!! get a new tuner!!! |
12-30-2016, 04:06 PM
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CC Member
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Join Date: Apr 2011
Location: Orange,
NSW
Cobra Make, Engine: Dax
Posts: 429
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Not Ranked
I agree. If the man with the dyno is asking his customer why the ECU is behaving like it is - it means he doesn't know... and hence he doesn't know enough to tune it properly.
Get a new tuner. Find one experienced in your ECU and you will save yourself hours of dyno time and end up with a better result in the long run.
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12-31-2016, 09:27 AM
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CC Member
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Join Date: May 2006
Location: St. Louisville,
Oh
Cobra Make, Engine: A&C 67 427 cobra SB
Posts: 2,445
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Not Ranked
I agree with the above comments, but I will elaborate... make that speculate.
I suspect that the memory location that he is looking at is not actually the long term fuel trims, therefore what ever software he is using is not mapped correctly for your ECU.
It is possible that your ECU has been flashed to something other than what the box originally was and therefore he does not have the correct software to look at it. What do you know of the history of your ECU? Could it have been played with by someone else, unknown to you? If not, you can rule this out.
It is possible that this fellow is just not using the correct software for your ECU. If this is the case, you really have the wrong guy.
If my assumption is wrong and the actual LT fuel trim is changing, then I would say that your ECU has been hacked up by some tuner, or it is defective.
I'm no expert, but this would be my first thoughts.
Last edited by olddog; 12-31-2016 at 09:31 AM..
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01-01-2017, 01:09 AM
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CC Member
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Join Date: May 2010
Location: Golden Square,
Posts: 161
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Not Ranked
Thanks everyone.
Old dog you maybe one to something there.
The ecu was sent off ages ago to get the vats Removed so it would at least start, but that was you another guy. I will ring him and find out what program he runs and see if it is a clash of programs causing this.
Stan.
Liam.
Hope to have it on the road this year., but then again I said that last year.lol
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01-11-2017, 02:20 PM
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CC Member
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Join Date: May 2010
Location: Golden Square,
Posts: 161
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Not Ranked
Problem Solved.
Now that Summernats is over we had another look at the motor.
A change of throttle body and everthing is fine.
The idle motor was siezed and also the seal on the manifold pressure sensor was buggered.
Changed them out and its behaving itself now.
Probably a common thing with secondhand motors.
The old box of chocolates theory.
onto the next job.
Now everything is working fine its tidy up all the wiring and it wont be long till the body goes on for the last time.
Stan.
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01-17-2017, 12:59 AM
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CC Member
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Join Date: Sep 2010
Location: redcliffe,
qld
Cobra Make, Engine: venom motorsports /ls1 auto
Posts: 500
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Not Ranked
and you said that how many times ago
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