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Re: It's finally done
Posted: Tue Sep 08, 2020 5:27 pm
by Duck Vader
Oy.
Just heard back from the tuner.
you've got air leak issues man.. You need to check the air intake, headers/exhaust manifolds, and exhaust system itself.. you're waaay lean, up at +17%... not good... shouldn't be that lean at all...
check the air intake, make sure it's all fully connected/together, and that all clamps/bolts from air filter to throttle body are all TIGHT so no air leaks anywhere...
check the headers/exhaust manifolds and re-tighten all bolts, make sure all TIGHT so no air leaks.. make sure no cracked manifolds, gaskets all good...
check headers/exhaust manifolds connections to exhaust and the whole exhaust system itself, make sure all bolts/clamps are TIGHT so no air leaks anywhere...
Make sure all breather hoses and vacuum lines are all connected where they should be... make sure no cracked/split hoses...
Check around the intake manifold, make sure no air leaks around the intake manifold... (may need new intake manifold gasket)
Guess I'll be trying to trace this down. Not sure how much I can do with the back the way it is.
Re: It's finally done
Posted: Tue Sep 08, 2020 6:06 pm
by Duck Vader
Checked exhaust clamps. Seem tight. Tightened down the intake clamps more. About all I can do right now. I'll have to get another log and see what it says.
Re: It's finally done
Posted: Wed Sep 09, 2020 10:10 pm
by Duck Vader
And it is worse now. Way lean up at +18% to +20%.
Thoughts on what to do/try? Really limited with my back right now and no money to send to a mechanic since no job.
Re: It's finally done
Posted: Wed Sep 09, 2020 10:13 pm
by Duck Vader
Oh and this is running lean when cruising at highway speeds ~ 60 mph and between 1700-2000 rpm.
Re: It's finally done
Posted: Wed Sep 09, 2020 10:27 pm
by Duck Vader
Might clean the maf sensor and see if I can check fuel pressure tomorrow morning but not sure if I'll be able to.
Re: It's finally done
Posted: Wed Sep 09, 2020 10:36 pm
by vr4
What's your calculated load and g/s maf readings at wot?
Re: It's finally done
Posted: Wed Sep 09, 2020 10:45 pm
by Duck Vader
Haven't done wot yet. The guy I'm using does a base tune based on steady state driving. Then adjusts for wot after initial tune. Won't do initial tune until I get the lean running down.
Re: It's finally done
Posted: Wed Sep 09, 2020 10:46 pm
by Duck Vader
I got a log off a diablosport tuner. Not sure how to read it as it's just a text file?
Re: It's finally done
Posted: Wed Sep 09, 2020 10:47 pm
by Duck Vader
I'm wondering if fuel issue.
Re: It's finally done
Posted: Wed Sep 09, 2020 10:51 pm
by tabasco122
should be .csv, you open it in excel and it divides the columns by the commas
Re: It's finally done
Posted: Wed Sep 09, 2020 10:53 pm
by vr4
Typically a fuel issue won't show up under part throttle unless real restricted. Vacuum leaks are worse at idle. Exhaust leaks would have to be real bad to cause an issue.
My money is on maf. Most common cause for lean conditions on gm vehicles.
Re: It's finally done
Posted: Wed Sep 09, 2020 11:03 pm
by Duck Vader
I'm going to clean the maf in the morning and get another log tomorrow night and go from there.
It is .log file.
Re: It's finally done
Posted: Thu Sep 10, 2020 4:09 am
by Duck Vader
Re: It's finally done
Posted: Thu Sep 10, 2020 1:43 pm
by mjannusch
It does this on the stock tune?
Re: It's finally done
Posted: Thu Sep 10, 2020 1:56 pm
by Duck Vader
Canned tune that was on the diablosport. If cleaning the maf does nothing I'm going to reset it to the factory tune, reset the ecu, drive a couple hundred miles over a couple of weeks and take readings again to see if the canned tune is messing with it.
The guy I'm using uses the canned tune as a base and then based on logs, makes a custom one using the canned as a started point match your specific vehicle.
Re: It's finally done
Posted: Thu Sep 10, 2020 2:01 pm
by DCIV
Maybe your intake gasket is leaking and you just made it worse by messing with it?
Coop
Re: It's finally done
Posted: Thu Sep 10, 2020 3:46 pm
by Duck Vader
Post cleaning of the maf.
Also cleaned throttle body.
Re: It's finally done
Posted: Thu Sep 10, 2020 3:52 pm
by DCIV
Can your tuner get rid of the “reduced power” when it detects wheel slipping? Also can if do things for gear ratio swap?
Coop
Re: It's finally done
Posted: Thu Sep 10, 2020 3:57 pm
by Duck Vader
Should I reset the ecu by disconnecting the battery and get a log again in a couple hundred miles or run the log again tonight? Does it matter?
Coop -I'll pm you the tuner details and you can ask him.
Re: It's finally done
Posted: Thu Sep 10, 2020 4:47 pm
by tabasco122
reset the ecu and give it a bit for the trims to settle.
