Help i'm getting 4mpg
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Senior User
Joined: Jan 2006
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Help i'm getting 4mpg
I have an 02 F350 V10 Reg cab with 4.10's. My mileage has taken a complete dump now down to 4 mpg. The fuel filter was just replaced and I was told it was clogged as all hell. Air filter is newer, and just changed the oil. No lights on the dash, checked the front hubs and they are disengaged. Couple things I have noticed in the past year is that I do have a rough idle, the 4x4 light will not stay on the dash when engaged, and the abs light comes on every now and then but has no effect. I have taken it to my mechanic for the rough idle and he just keeps replacing coils hoping it will go away. I am completely lost here and do not like the guessing game at trying to replace parts. Suggestions would be greatly appreciated.
Senior User
Joined: Nov 2007
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From: Laramie Wyoming
Your mass airflow sensor could probably use a cleaning, or replacing. Also, try leaving your battery unplugged for a few hours, then plug it back in and go. It will force the computer to re-evaluate its engine control strategy.
Cargo Master
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Posting Guru
Joined: Jun 2005
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From: central Louisiana
mass air flow censor and air idle control valve........ i'd trouble shoot those two area's first.
there was another member a while back that was having VERY similar issues, and he ended up finding that his mass air flow censor was not plugged in all the way after he changed his filter.
as far as the AIC, had a semi weird idle issue in the past and cleaned the AIC with some degreaser, and a tooth brush, and it seemed to help out quite a bit, there was no more slight fluctuation at an idle.
there was another member a while back that was having VERY similar issues, and he ended up finding that his mass air flow censor was not plugged in all the way after he changed his filter.
as far as the AIC, had a semi weird idle issue in the past and cleaned the AIC with some degreaser, and a tooth brush, and it seemed to help out quite a bit, there was no more slight fluctuation at an idle.
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Plugs were done 2 years ago. Haven't done wires or anything yet. I forgot to add the truck has 74k on it. I'm going to try some of the suggestions. Thanks again
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From: Wayyy NoCal, USA
If the vacuum leak patrol, MAF and IAC cleaning don't help, consider replacing the upstream 02 sensors. Once they get a bit fouled, they give errant reading to ECU, which sends worse signals to injectors, which results in more fouling, which results in even worse feedback.... Classic death spiral.
And it usually won't trip the CEL because the ECU is thinking everything is OK because of the readings from the 02 sensors - which are garbage.
I change at 100K in all my vehicles as normal PM.
The 02 sensors after the cat converters are rarely an issue as the exhaust after the cat is pretty clean.
And it usually won't trip the CEL because the ECU is thinking everything is OK because of the readings from the 02 sensors - which are garbage.
I change at 100K in all my vehicles as normal PM.
The 02 sensors after the cat converters are rarely an issue as the exhaust after the cat is pretty clean.
Postmaster
Joined: Oct 2008
Posts: 3,924
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From: Richmond BC
If the vacuum leak patrol, MAF and IAC cleaning don't help, consider replacing the upstream 02 sensors. Once they get a bit fouled, they give errant reading to ECU, which sends worse signals to injectors, which results in more fouling, which results in even worse feedback.... Classic death spiral.
And it usually won't trip the CEL because the ECU is thinking everything is OK because of the readings from the 02 sensors - which are garbage.
I change at 100K in all my vehicles as normal PM.
The 02 sensors after the cat converters are rarely an issue as the exhaust after the cat is pretty clean.
And it usually won't trip the CEL because the ECU is thinking everything is OK because of the readings from the 02 sensors - which are garbage.
I change at 100K in all my vehicles as normal PM.
The 02 sensors after the cat converters are rarely an issue as the exhaust after the cat is pretty clean.
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