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Old 06-22-2022, 06:15 PM   #29
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Mr. Mark, A little feedback

Just took a trip towing and thankfully no lugging. A good ride overall.
Hooked up scangauge and had long term trims ranging from 8 to 12 with most time around 10-11. Highest reading on MAF was 175 at 3500 RPM's, never took the engine higher.

Realized today that I do have a scan tool (Autel ML619)that scans live data and saves it. Hooked it up at home and at idle, 745 RPMS's, Short terms were 2-3 and long term was 4.5, both banks.
Bought an OBD splitter and will run scangauge and AUTEL to see if readings compare.

Is there a way to refresh the long term fuel trims to start new data?

Tim
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Old 06-23-2022, 04:30 AM   #30
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Quote:
Originally Posted by TimLoon View Post
Just took a trip towing and thankfully no lugging. A good ride overall.
Hooked up scangauge and had long term trims ranging from 8 to 12 with most time around 10-11. Highest reading on MAF was 175 at 3500 RPM's, never took the engine higher.

Realized today that I do have a scan tool (Autel ML619)that scans live data and saves it. Hooked it up at home and at idle, 745 RPMS's, Short terms were 2-3 and long term was 4.5, both banks.
Bought an OBD splitter and will run scangauge and AUTEL to see if readings compare.

Is there a way to refresh the long term fuel trims to start new data?

Tim
I’m not by any means an expert on fuel trims and MAF data, but the numbers you gave look good to me.

There was a guy on YouTube who did an awesome video of explaining how all that stuff works.
But then I thought I would throw the question to Brazel’s - one of the sponsors of this site.
Working with Jon - he gave me clear direction of what data he would like to see and under what driving conditions. I did that after having already changed plugs and wires as well as my fuel pressure regulator on the fuel rail. Coach had 37k miles on her.
I had also cleaned the MAF with alcohol (everyone’s shelf’s we’re bare for cleaner) and replaced the air filter. The fuel pressure regulator was definitely leaking. But after all that, I still didn’t like the the long term trims so I got with Jon. After looking at the data, he said replace the MAF. I did, trims came down.

I started down this road because I was seeing long term trims in the 20’s which is way too high. Engine ran good - but from what I understand, fuel trims can be a silent killer.
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