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#1
03-27-2009, 02:17 AM
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OBDII long term fuel trim, does it tell you anything?
When I accelerate it goes to about 19, when I let off the gas and coast it goes to 30. Does this data mean anything at all?
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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine) 1988 F150 144,000 miles (leaks all the colors of the rainbow) Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra 
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#2
03-30-2009, 08:10 AM
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Not really.
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MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator
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#3
03-30-2009, 10:38 PM
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Doesn't the high number like 30 suggest anything? I realize no one told me to look at this number, but why does it report it if it means nothing? I thought the long term trim might have SOMETHING to do with the condition of the MAF. Or is this number completely useless? Last year it was 19.
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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine) 1988 F150 144,000 miles (leaks all the colors of the rainbow) Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra
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#4
04-07-2009, 12:26 AM
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Well I had a P0170 code also. I was hoping the LTFT might help to confirm a bad MAF diagnosis. I checked the fuel pressure regulator and it was good. I inspected the vacuum lines. So I put in a new MAF. The LTFT has been falling ever since. The reading has changed like this:
Before changing MAF 31 After 9 mile trip 28 Another 9 mile trip 25 6 mile trip 22 6 mile trip 21 30 miles 18 30 miles 17 current reading. So I guess I high LTFT reading could indicate an aging MAF. At least it seems that way in this case.
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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine) 1988 F150 144,000 miles (leaks all the colors of the rainbow) Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra
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