lean fuel mixture
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New User
Joined: May 2003
Posts: 22
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lean fuel mixture
as in my previous post i have a 171 and 174 code for lean mixture on both sides of the engine. (1996 5.8L E-150) Ive ruled out o2 sensors.
has this happen to anyone else and what is the probal cause.also where exactly is the IAC valve on the throttle body. Is it the silver box with a plug on the passenger side of the TB
help lm lost!!
has this happen to anyone else and what is the probal cause.also where exactly is the IAC valve on the throttle body. Is it the silver box with a plug on the passenger side of the TB
help lm lost!!
Last edited by jamess67; May 29, 2003 at 06:18 PM.
Junior User
Joined: Apr 2003
Posts: 84
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From: Oklahoma City
lean fuel mixture
You can try cleaning or replacing your IAC but your fuel injectors can also cause a lean condition.
You might try having your injectors flushed before you start spending a bunch of money replacing parts.
It worked for me after chasing a lean running condition!
You might try having your injectors flushed before you start spending a bunch of money replacing parts.
It worked for me after chasing a lean running condition!
Postmaster
Joined: Jan 2003
Posts: 4,417
Likes: 3
From: Durham, NC
lean fuel mixture
The IAC controls the idle speed, it should not cause a lean
code. The next thing I would do is check the fuel pressure.
The fuel pressure regulator, blocked fuel filter, or bad fuel
pump can cause low fuel pressure, resulting in a lean code.
code. The next thing I would do is check the fuel pressure.
The fuel pressure regulator, blocked fuel filter, or bad fuel
pump can cause low fuel pressure, resulting in a lean code.
New User
Joined: Mar 2003
Posts: 24
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From: Northeast
lean fuel mixture
I dont know If your truck has a MAF sensor if it does take it off and see if its dirty.THe wires should be silver not black.I just did this on my 95 T-Bird 3.8.This car has been giving me fits for the past year.I thought it was the fuel pump too .This repair took 3 hours research, $.10 cents carb cleaner $.10 cents Brake cleaner and 15 minutes to do. Dont touch the sensor. I just sprayed carb cleaner first to clean it then brake kleen to remove any residue then let it dry.Clear the codes and see what happens.I hope this helps.
.I thought it was the fuel pump too .This repair took 3 hours research, $.10 cents carb cleaner $.10 cents Brake cleaner and 15 minutes to do. Dont touch the sensor. I just sprayed carb cleaner first to clean it then brake kleen to remove any residue then let it dry.Clear the codes and see what happens.I hope this helps.
the whole deal was caued by a vaccum line not connected that goes to the IAC. All fine with the world now. thanks for responding anyway
There are no vacuum lines on the IAC - just an electrical connector, 2 screws, and a vent on some.
