Ford F-150 - 1997-2003 :: 1999 4x4 5.4L Starts / Stumbles And Quits
Sep 12, 2012
I come over from the old school forum (48-60) with a question about a new to me 1999 F150 XLT 5.4L, 4x4, Auto. Truck has ran awesome for a couple of days. Truck has in excess of 410,000 miles but don't let that mislead. I believe the engine has been replaced sometime along the way. Yesterday I was driving and it just stumbled and stopped. After sitting for 5 minutes it started again, stumbled and stopped.
Today I checked the following:
- Fuel pump/relay - both work
- Dropped gas tank and replaced fuel pump strainer and fuel filter
- Fuel pressure at rail remains steady
- No codes present and no SES/CEL on.
Could this be a plugged EGR valve or IAC valve? I have had similar issues on Tauruses but it always threw a code when it did. Could this indicate a cat issue?
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The 1997 Saturn SC2 is new to me. It was delivered to my home after purchase and died. The car had been sitting for a while and was suggested by previous owner that it was the battery. After having charged the battery, she ran for about 5 mins and stopped. I was also informed that the fuel line sometimes would disconnect, but that is not the case now.
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2002 F-150 4.2L. About a year ago, it threw the P0171 and 0174 codes up. After replacing all the simple stuff, I bit the bullet and replaced the lower intake gasket as well as the upper intake gaskets. Buttoned it all up, reset the codes and we were back in business. No issues, truck ran good. About 6-8 months later, the check engine light came back on, I check it and it was that pesky set of codes again, 0171 and 0174.
It still ran fine, but the codes were there, so I just drove it for a while (it's a company truck that doesn't get driven that much).
A couple of weeks ago while driving it, it acted very sluggish. You could mash the accelerator and it would just very slowly run up the speed. It never hesitated or missed, it just got very very sluggish. Checked the codes, no additional codes.
Then it began to stumble when you mashed the gas.
I put new plugs (old one's looked great, other than a huge gap), new wires, new coil pack and started it. Pushed the gas pedal, it just dies.
I look for obvious vacuum leaks and replace a couple of elbows for the PCV and it seems to run a little better. Enough so that I can drive it, but still not running right.
I ordered all the intake gaskets and new isolator bolts and spend Saturday pulling that apart. I didn't do the lower intake because the upper intake gaskets looked so good, I just don't believe this is a intake gasket problem. None the less, I installed the new gaskets on the plenum and upper intake, new isolator bolts, replaced a couple pieces of vacuum hose that looked cracked, started it back up, it ran as smooth as silk.
Convinced I had it fixed, I went for a test drive. Idling, it is as smooth as you could ask for. Pull up to a stop sign, wait, step on the gas and it chokes. Just stumbles and you can hear it almost backfiring and pushing air back through the system.
I've put new PCV, new EGR, new vacuum lines in several places, new upper intake gaskets, new plenum gaskets, new isolator bolts, and even new o-rings on the injectors, and I'm still getting the 0171 and 0174 codes.
With the diagnostics on, I can see voltage varying on all O2 sensors, so I assume they are working (none of them are reading 0 volts). It doesn't throw any other code up, other than the 0171 and 0174.
At this point I feel like I'm replaced every single thing ever mentioned in any 0171 and 0174 thread on the internet. Where to go next? 1 more point, if you very slowly push the gas, it runs fine, but any pressure on it, it bogs down and just stumbles.
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1997 Ford f-150. No heat.
I have replaced Radiator (Leaking)
New heater core (Signs of leaking when I replaced it)
New blend door (Why not...I am already in there)
Actuator motor works fine
New thermostat.
Both heater core hoses are hot. (same temp, feels like)
My next step is going to be water pump. I read where some have replaced pump and found that although no leaks were found the fins were deteriorated to the point it would not work. Truck does not overheat. Coolant level is fine. Cab gets heat for a few seconds then quits.
Money is not an issue so I don't mind throwing a few parts at it. What other parts are left?
Temp. control switch
Water pump?
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98 f150 4.2l imrc quits working after 30 secs or so. Valves are good,linkage is good, vacuum lines good, electric vacuum switch/valve on r/h side of intake good, power to that switch/valve is there, loosing ground from computer??? What tells the computer to operate these valves?
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I have a 1997 forkd F150 with a 4.6L Romeo engine. I have recently rebuilt the engine and now since it is put back together I am having a issues that i cannot pin point. When the truck is running and in gear my RPM drop to around 500 or below and my oil pressure drops and comes back up when the rpm's come back up this an intermittent problem and I have replaced the IAC valve and every once in a while i get a P0401 code for the exhaust recirculation. I think I am loosing some kind of vacuum. It was not doing this when I tore into the truck. It seems to be running okay not hesitation.
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This 97 F150 4.2 is new to me, originally a very base 2wd white fleet vehicle, with 189,000 miles, runs smoothly and quietly, idles well, transmission shifts smoothly. Gets reasonable gas mileage.
Problem statement: the truck has an intermittent starting problem. The failure to start happens about 5-10% of the time. The motor will turn over fine, but but immediately stumbles while trying to start. Turn key off and then re-start attempt will be again followed by a bucking stumble. Some times the motor might try and run for 2-3 seconds bucking and stumbling. It is possible the problem happens more often when the truck is warm and has been shut off for 15 minutes or so. Once the problem happens it is very repeatable. It won't start again unless I wait about 30 minutes to an hour. Once it starts it seems to run very nicely. I have noticed some times when I go to successfully start the truck it might run roughly for the first 3-4 seconds bucking and sputtering a bit and then smooth out and not have an issue until the next re-start attempt.
The truck runs so nicely when it is running I doubt it is an issue with the plugs, air filter general tune up. Could it be an intermittent fuel pump issue? The next time it occurs I will check fuel pressure. Could it be fuel pressure regulator? Also tested by fuel pressure. ECU? The truck runs very nicely most of time that seems like a long shot. Crank sensor? Bad fuel? I did add some dry gas.
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My 02 F150 4.6 has 84K miles on it, and started stumbling/hesitating during accellartion about three weeks ago. Before this problem started (about 2,000 miles ago), I installed a new fuel filter and air filter. Since I noticed the problem, I installed new plugs. The problem didn't go away, so today I checked the fuel pressure. At idle the pressure is 32psi with the vacuum line left on the fuel pressure regulator (30-45 is normal as per Chilton's), and 42 with the vacuum line off (40-50 is normal as per Chilton's). I also had someone else rev the engine so I could observe, and found that the fuel pressure went as low as 28 when the engine speed was quickly increased. The standing fuel line pressure is 30 (30 is normal as per Chilton's) Does this sound like a fuel pump problem, or is there something else that I'm missing.
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2001-F150 5.4 Eng. bucking/stumble. I think my problem is slightly different than what I am reading about. Here is what I get (125k miles):
* Engine only bucks/stumbles intermittently and not at idle or at harder acceleration (this bucking is really harsh and makes the truck feel like a learner trying to drive a manual transmission and it is jumping down the street). The engine stumble is not a regular timing such as a cylinder going out and staying out for a period of time. It is quite a random pattern to the jumping
* Originally thought it was humidity related, but now I realize it happens in any climate
* No stumble in neutral at any rpm... only at a stop if I put it in a power brake load.
* When the stumble shows up, it seems like the throttle is around 10-25% (my best guess)
* Sometimes goes days without issue, but sometimes every ride and virtually every acceleration.
* Normally no stumbling at highway speeds, unless going up a hill.
* Every time it stumbles, it can be eliminated by either backing off on the accelerator some, or hitting the accelerator harder.
* No engine codes or CEL has ever come on
* Fuel mileage appears to be the same before and after the trouble started
Here is what I have done to try to correct it:
-> Fuel related (bad gas)... tried to run the tank as close to empty and fill it with fuel from different stations... when this didn't work, I have added HEET to it to dry up any water in tank.
-> Fuel delivery... replaced the fuel filter... seemed to work for one day, but then the gremlins came back.
-> Fuel delivery... ran multiple injector cleaners through tanks of gas.
-> Intake... replaced the filter.
-> Electrical... I don't believe this is related, but my battery died... parts store tested the system and stated the alternator was bad... replaced it, and took the old one to the parts store for bench testing and it was 100% OK... even thought the old showed OK, I left in the new one as a precaution. Only other item was a set of plug changes around 30k miles ago... I think I put in the super duper Bosch plugs with a lifetime warranty.
Current thinking and items I don't understand:
A) The bucking is so severe, it appears to be a random harsh loss of either fuel or ignition. A component that has failed electrically should give me a fault code with this level of severity. No trouble codes or indicators to electrically sense this disturbance...
B) For the fuel path, the most likely item is bad gas and I emptied my tank by running it as close to empty as possible and then used different gas and HEET to eliminate water. THIS MIGHT STILL BE THE CAUSE???
C) Another one for the fuel path is an intermittent fuel pump electrical connection or a weak pump from a pressure point. But if this is the cause, then why does it dissappear upon harder acceleration?
D) One last fuel thought is injectors... perhaps one or more have a range of delivery that they don't work properly... but this doesn't make much sense as at idle and harder accels are fine
E) From an ignition standpoint, perhaps I have failing COP's. I have not just gone out an replaced them due to my limited budget and the difficulty I read about changing them. Again, if one of these is failing in an either open or short condition, the computer should set a code for a misfire for the related cylinders. I get nothing. Hence my hesitation in making this change so far.
One thing i don't understand from the various posts is that the cops can fail under loading. what makes this happen as electrically, i don't think they can detect a load or not? it is hard for me to also understand why my truck would allow me to back off on the throttle or hit it harder and the issue disappears.
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The Speed Needle works fine. But...the Odometer part quit some time ago. I can't tell what my fuel Mileage is now. How to troubleshoot this problem?
Things that might affect this problem; Transmission skids loudly when going in and out of 4-OD. It could be the Torque converter clutch?
The Gear shift lever is sloppy. Doesn't fill me with Confidence.
Brake fluid warning light is on most of the time. Fluid level is up hi though. Driver door mirror control switch don't work in one direction Who on this Forum has a Switch for me?
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Ole girl finally let me down, or I let it down at 224,000mi. Started just fine one early cold morning and in about 30 seconds started stumbling and down for the count she went. Acts like it wants to run but will only stumble.
Checked inertia switch (ok) and all vacuum lines/caps appear to be fine. I was kind of due for new set of plugs/wires and a fuel filter. Replaced all didn't see any problems with the old when pulling. She will run for a few seconds, but stumbles and not smooth while running. Checked fuel pressure KOEO 40psi steady. I can hear fuel pump charge system per as usual.
Seeing as it is super cab checked for chafing on wiring to fuel pump under cab. Looks fine. I've heard tell could be alternator, which seems odd to me. Wondering if it would be worth pulling it off and taking it in for a bench test? Maybe I missed something. I know the intake gasket is suspect.
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My engine suddenly stops while driving. There is no warning or loss of power, it just stops randomly after running fine for a while. After some time (might be minutes or hours) the engine turns on and runs fine.
I have no clue what it might be, I believe it might be an electrical problem affecting the diesel pump. The pump has a pair of cables coming in to a white plug at the pump's back, I disconnected them but the engine still runs.
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Is there an alert setting to signal when a regen starts? My engine stumbles badly a few seconds after a regen starts. The dealer hasn't found the problem. Right now I just keep an eye on the soot level gauge.
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I have a 1995 buick roadmaster with 308,000 miles. The car quits intermittently but starts up immediately thereafter. Seems like an electrical issue but it doesn't act like the distributor is malfunctioning or fuel stoppage since it doesn't shudder prior to quitting. I have had the car since new, we love it and would like to keep it.
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So, I don't use my F150 too much and an animal made a nest int the intake tract and the nest material (chewed up air filter) got sucked in the throttle body all the way to IAC valve. So I thought I cleaned everything out, even got a new IAC. It starts now but just dies. I didn't remove the throttle body, should I? Where else do you think I could I find this stuff?
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Truck starts right up. Will die if I dont give it some gas for about 5 seconds of so. No check engine lights. I did leave the hood open yesterday adn the auto sprinklers came on. I completely forgot about it. I check the air filter before I started it and its dry so I dont feel its water intrusion. I shot a quick burst of carb cleaner in the IAC and then reinstalled it. No joy. When running it will idle and runs fine. If I unplug the IAC it stumbles and almost dies. Any way to test the IAc, TPS or MAF sensor ? I hate just throwing parts at them without diagnosing them properly.
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I started having trouble with the truck only starting in neutral and it was a trick to get it to start even then. I bought a new range sensor, bolted her up (with alignment marks in neutral) and she's still doing the same thing.
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We have a 2003 Ford F250 Super Duty, gas engine. This will start fine, then a day later, it won't. Wait 30 minutes, then it starts.
Starter and battery are fine. It acts like it isn't getting fuel. Fuel pump? Filter? What else might cause this?
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Transmission problems 2002 f150 lariat... Once I get up to about 50 mph the truck starts jerking around..
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I have recently acquired a 1997 F250 LD (same body as the 150)the exhaust system is screwed(currently rebuilding it due to some IDIOT trying to cut out the cats with a grinder and cutoff wheel) and it won't idle (runs alright with a little finessing of the throttle) but after I get the exhaust rebuilt to where the O2 sensors get the proper flow I was going to clean the IAC valve but was wondering if the exhaust not feeding right would cause idle issues a well. Put things in a nutshell...the truck will run but will not idle. IAC Probs, Exhaust Probs, or combination of both??
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Ran for a month just fine. Now it will only start after being jumped. Everything worked just fine.... What should I test first?
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