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pacificobob
Super Nomad
Posts: 2298
Registered: 4-23-2006
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yes, i would check the TPS, also O2 sensor.....
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mtgoat666
Select Nomad
Posts: 18115
Registered: 9-16-2006
Location: San Diego
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Mood: Hot n spicy
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should have bought a Toyota!
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SFandH
Elite Nomad
Posts: 7084
Registered: 8-5-2011
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It's not supposed to be but it seems to be somewhat so. 
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SFandH
Elite Nomad
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Connected my OBD II code reader and it's telling me P0304, "cylinder 4 misfire" and P0316 "Misfire detected 1st 1000 revs."
Of course the number 4 cylinder is in the back, passenger side and the back 1/2 of the motor is under the windshield cowling, tough to see let alone
get to.
Hmmm, what's the fix to clear these codes?
[Edited on 7-11-2016 by SFandH]
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woody with a view
PITA Nomad
Posts: 15939
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Location: Looking at the Coronado Islands
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Google is your friend. Start with the cheap items.
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SFandH
Elite Nomad
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Yeah lots of info on google for P0304.
Plug, plug wire, ignition coil, fuel injector. Need to start narrowing it down. Plugs were changed 30,000 miles ago.
Just started the truck again and the check engine light came on.
[Edited on 7-11-2016 by SFandH]
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TMW
Select Nomad
Posts: 10659
Registered: 9-1-2003
Location: Bakersfield, CA
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I would check the fuel pressure before doing any serious repairs.
In Jan. I did a Baja trip and on the way home my 04 GMC started missing and the check engine light came on. The OBDII test showed a misfire. I was
able to drive it home without any problem but within a mile of home it really got bad. Had AAA take it to my mechanic and he found the fuel pump was
bad. That was the third fuel pump in 150,000 miles.
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woody with a view
PITA Nomad
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Not sure how yours is but my coil packs are on top of each spark plug boot. If this is your issue you should be able to move the suspect coil to
another cyclinder and the code should follow you.
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Bob and Susan
Elite Nomad
Posts: 8813
Registered: 8-20-2003
Location: Mulege BCS on the BAY
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woody's right...switch 'em ...if that's it then the problem will follow
one of my cables broke...the screw area that holds it in place...it would flop around and cause a misfire...make sure they are all secure
but a code misfire on#4 is probably the fuel pump
my 5.4 had this issue...first we fixed a wire in the tank
then later we replaced the pump...when it stopped working of course
the check engine light CAN come on because you have dirty battery cables...it resets by disconnecting the ground wire
did you take off the idle valve behind the intake to see if its clogged...2 bolts does it
its electric so its like a light bulb...it can go out any time
sometimes its better to understand you are beaten and take the beast in to the shop and let the professionals operate...that's what they do
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SFandH
Elite Nomad
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Hmmm, do you have some reasoning behind that conclusion.
Call me crazy but I'm thinking a cylinder #4 misfire probably has something to do with the gizmos, widgets, and gadgets associated with cylinder #4.
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TMW
Select Nomad
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Location: Bakersfield, CA
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If the fuel pump is intermittent you won't get a good fire in one or more cylinders. The code can't tell you the pump is bad only the results from the
pump being bad.
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Bob and Susan
Elite Nomad
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tmw is right ...
it could be as easy as a ground wire for the pump...
my f250 is a "rust bucket"
i'm always having problems with grounds
don't you just hate it when part of your fender falls off...
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BajaBreak
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Not Sure if you have the era of Triton's that had the spark plugs stripping out of the head, but maybe look into the symptoms of that. Seems too
specific for that. I'm trying to resolve a similar lag, and am hoping advancing the timing will help. Need to move the crank sensor b/c timing is
controlled by the ecm on mine. It gets retarded over time as the distributor wears.
Happy part shopping!
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SFandH
Elite Nomad
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Well that sucks. I thought I was zeroing in on the problem and you guys add another possibility, a faulty fuel pump.
I'm still hoping for a dirty injector and the $5.00 fuel cleaner additive will fix it. I'll give it 100 or so miles. I know, slim chance, but I'm in
no hurry.
[Edited on 7-11-2016 by SFandH]
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willardguy
Elite Nomad
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yeah great idea to peck away at cheap stuff that could use replacing anyway!
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BajaBreak
Nomad
Posts: 154
Registered: 12-20-2012
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Keep any old parts that were known to be functioning for a little Baja spare parts kit. That way you don't have to feel like you wasted too much money
on unnecessary stuff.
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SFandH
Elite Nomad
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The cylinder #4 misfire is boiling down to be an intermittent problem. I have about 200 miles on the tank with the Lucas fuel treatment and it seems
to be less of a problem, more difficult to reproduce.
I went for a ride today and all was fine for the first 30 miles, I couldn't get it to misfire, then it started to stumble badly. That lasted for maybe
5 miles and then it smoothed out. I couldn't get it to misfire again at any rpm/speed/gear combination.
Does that narrow it down? I'd like to have a good idea of what the problem is before I take it to a mechanic.
I'm thinking about digging into it myself. What should I test first? Lots of videos on youtube about changing plugs, injectors, coils on the exact
motor so I won't be going in blind. 2003 Ford 2 valve 5.4 liter.
I have until October to get things ship shape. Then I'll be heading to BCS for the winter.
[Edited on 7-19-2016 by SFandH]
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taoswheat
Junior Nomad
Posts: 73
Registered: 11-29-2007
Location: Taos, NM USA
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Just a thought- When I have a tough problem I go to justanswer.com. It costs a bit but there are many professional mechanics with factory failure
information and repair data just waiting to work on your problem.
JohnW
Taos, NM
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SFandH
Elite Nomad
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Thanks John, that's an idea.
Gotta get to Taos someday.
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55steve
Senior Nomad
Posts: 857
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Location: Warner Springs, CA
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150,000 miles - have the plugs & wires ever been changed?
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