2001 5.4 rare idle problems??
#16
01-11-2011, 08:02 PM
Senior Member
Join Date: Jun 2007
Location: Fenton,Missouri
Posts: 987
Likes: 0
Received 0 Likes
on
0 Posts
Well I have the dreaded 171 and 174 codes on my 02 5.4 here is a list of what I have checked/changed so far:
new plugs and cop's done in July 09
coolant flushed/refilled "
tranny " "
new MAF
new ox sensors
new EGR. solinoid and DFPE sensor
new fuel filter
what else am I missing for these codes?
new plugs and cop's done in July 09
coolant flushed/refilled "
tranny " "
new MAF
new ox sensors
new EGR. solinoid and DFPE sensor
new fuel filter
what else am I missing for these codes?
#17
01-11-2011, 08:14 PM
Join Date: Dec 2009
Location: Shawnee, OK
Posts: 1,952
Likes: 0
Received 0 Likes
on
0 Posts
CRC MAF cleaner is okay. Better than nothing and better than most. JBrew uses alcohol and a Q-tip, I don't recommend you touch the MAF with anything unless you know what you are doing and are experienced. It's too easy to break the fine wire. Just spray it and let it dry.
Don't change the O2 sensors yet. They look like they are doing their job.
The most common cause for a lean code is a vacuum leak - and the most common vacuum leak is the PCV elbow behind the intake manifold.
Don't change the O2 sensors yet. They look like they are doing their job.
The most common cause for a lean code is a vacuum leak - and the most common vacuum leak is the PCV elbow behind the intake manifold.
Well I have the dreaded 171 and 174 codes on my 02 5.4 here is a list of what I have checked/changed so far:
new plugs and cop's done in July 09
coolant flushed/refilled "
tranny " "
new MAF
new ox sensors
new EGR. solinoid and DFPE sensor
new fuel filter
what else am I missing for these codes?
new plugs and cop's done in July 09
coolant flushed/refilled "
tranny " "
new MAF
new ox sensors
new EGR. solinoid and DFPE sensor
new fuel filter
what else am I missing for these codes?
#19
01-11-2011, 11:05 PM
Senior Member
Join Date: Nov 2004
Location: SoCal
Posts: 358
Likes: 0
Received 0 Likes
on
0 Posts
Bigtruckguy, "I did try and find the elbow to see if it had a crack the other day but either wasnt lookin hard enough or i was havin a dumb moment and overlooked it but i couldnt find the elbow." You have to reach all the way back behind the intake manifold to get the tube/hose off and check to see if its cracked or not...Its behind the throttle body and down a little.....
#20
01-12-2011, 12:48 AM
Join Date: Dec 2009
Location: Shawnee, OK
Posts: 1,952
Likes: 0
Received 0 Likes
on
0 Posts
#21
01-12-2011, 12:58 AM
Senior Member
Join Date: Nov 2009
Location: San Diego/Modesto, CA
Posts: 181
Likes: 0
Received 0 Likes
on
0 Posts
Check the rubber grommet around the MAF sensor when I changed out the filter on my parents 01 I didn't put it back like it was supposed to and it threw the CEL
I changed:
4 o2 sensors
full tune up
The full pcv hose with new elvow
and that hose that goes from the throttle body it has a green clip
and all it was was the goment that was not closed down right
I changed:
4 o2 sensors
full tune up
The full pcv hose with new elvow
and that hose that goes from the throttle body it has a green clip
and all it was was the goment that was not closed down right
#22
01-13-2011, 03:13 AM
Personal experience...check one of two things BigTruckGuy. Vacuum leaks, and a thing that can really screw with your mind---leaky EGR valve. Really causes radical idling, almost like a MAF sensor. Then again, the MAF sensors are screwy, too. Take the K&N out, run a stock filter. I know if I take my air cleaner out while the truck is idling, it surges, but not as bad as you described.
#23
01-14-2011, 12:39 AM
Join Date: Dec 2009
Location: Shawnee, OK
Posts: 1,952
Likes: 0
Received 0 Likes
on
0 Posts
#24
01-17-2011, 11:28 AM
Join Date: Dec 2009
Location: Shawnee, OK
Posts: 1,952
Likes: 0
Received 0 Likes
on
0 Posts
Took my air filter apart and cleaned all the excess oil out, there was a ton. Tried to take the maf apart but the darn hex bolts had a stud in the middle that required a special tool i guess so i left it alone.
Got some tb cleaner started the truck and sprayed about 1/4 the can in there. Un did my battery cable and then hooked it all back up.
Did that saturday and my cel hasnt came back on since.
Got some tb cleaner started the truck and sprayed about 1/4 the can in there. Un did my battery cable and then hooked it all back up.
Did that saturday and my cel hasnt came back on since.
#26
01-17-2011, 02:43 PM
Join Date: Dec 2009
Location: Shawnee, OK
Posts: 1,952
Likes: 0
Received 0 Likes
on
0 Posts
#27
01-17-2011, 06:55 PM
#28
01-17-2011, 08:16 PM
Join Date: Dec 2009
Location: Shawnee, OK
Posts: 1,952
Likes: 0
Received 0 Likes
on
0 Posts
Well i tried to grind the little center peice down and grinded the grooves of the whole thing out so im guna have to go to a junkyard and get a new maf
#29
01-17-2011, 08:47 PM
Senior Member
Join Date: Sep 2009
Location: Wichita Falls, Tejas
Posts: 143
Likes: 0
Received 0 Likes
on
0 Posts
Saftey torx can be found at ur local lowes for under $10. If you do plan on going to a junkyard make sure u have them. Just bc u botched the head on the screws dosent mean u need a new maf tho. Get a stripped screw remover kit (lowes) and try to remove them first. U can always replace them with new screws lowes also should have the thread pattern that u will need as well as a more traditional Phillips head if u prefer.
#30
01-17-2011, 09:08 PM
Join Date: Dec 2009
Location: Shawnee, OK
Posts: 1,952
Likes: 0
Received 0 Likes
on
0 Posts
