Is it normal for my long term fuel trim levels to be negative 10%?
Fuel Trim Levels
Started by optimus prime, Mar 14 2012 02:07 PM
3 replies to this topic
#1
optimus prime
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Posted 14 March 2012 - 02:07 PM
1998 S70 NA
1997 850 GLT
#2
Converted
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Posted 30 April 2012 - 02:53 AM
Hmm lol I have the opposite problem
In is 26% running rich as hell, I'd say it may be running lean but that's not a total bad thing I'd ring a Volvo dealer and ask them what is the acceptable long term fuel trim parameters are make out u are a mech by saying that fancy word would get u in the door as most dealers hate divulging that kind of Info out
In is 26% running rich as hell, I'd say it may be running lean but that's not a total bad thing I'd ring a Volvo dealer and ask them what is the acceptable long term fuel trim parameters are make out u are a mech by saying that fancy word would get u in the door as most dealers hate divulging that kind of Info out
#3
optimus prime
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Posted 30 April 2012 - 12:06 PM
acceptable trims are -10% to 10% the closer to 0 the better anything else represents a problem with the fuel system or vacuum system.
1998 S70 NA
1997 850 GLT
#4
the commissar!
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Posted 02 May 2012 - 03:36 PM
I don't know what is "acceptable" but IIRC, LTFT +/- 20% sets off CEL. LTFT is designed to fluctuate and it is impossible for it to lock in to a zero reading or even close to zero and stay there...that is why you have a range of 40% before it is a problem. If you watch it on a steady highway cruise it will be much more stable than when you are in stop and go traffic. It is a problem when the engine management system cannot influence the variable parameters enough to keep the trim in control.
To answer the OP question yes, that is normal
To answer the OP question yes, that is normal
1998 V70 T-5 -Auto - ARD Blue & Turbo-Tuner,18T, HD TCVw/ Hallman Pro MBC, custom 3" DP w/ Volvo 2.75" sport catback - both wrapped and coated, RIP, IPD aluminum intercooler, intake w/ K&N cone, R ex. manifold, , gasket matched & polished intake manifold w/ thermoblock spacer, n/a TB w/ 960 plate, Optima bluetop, MSD 6aD and blaster coil, IPD plug wires, IPD poly bushing, Koni FSD w/ Eibach springs, IPD sways 25mm x 25 mm, blue silicone vac, silicone coolant lines, custom intake tubes grill to turbo, skid plate, front lower brace, cherry turbo strut brace, HD endlinks, 302mm brakes, Zeitronix wide-band/data-logger, Walbro w/variable fpr. In process: Home grown HD Endlinks, Meth/H2O injection, greens, catch can, fully built 2.3.
