Ford F-150 - 1997-2003 :: 2002 - Hard To Start When Warm
Nov 14, 2014
I have a 2002 F-150 4.2L that is hard to start when warm. Cold starts are no problem, except in the below 0 F stretch last winter. Also when it is a hot start it is not an issue. Only when it has sat for a few hours does it have an issue. The following is the list of things that have been done.
- New Plugs,
- New Plug Wires,
- New Coil Pack,
- New Fuel Filter,
- Clean Throttle Body,
- Clean Mass Air Sensor,
- Clean Idle Bypass,
- Replace EGR Vacuum Control Switch,
- Manifold Leak Repair (Ford Dealer),
- Throttle Body Stop Adjusted for more idle speed,
- Check fuel pressure (40 psi key on, drops to 35 psi static).
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Sometimes the truck is hard to get started and to keep running, Once it warms up it will run fine. The next time it is started it will start fine but when you are going down the road if I try to accelerate it will start backfiring and not pick up any speed. I am getting a lean code on both banks. I have changed the IAC, the throttle position sensor and mass air flow sensor. 2002 F150 with 6 cyl
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Driving the last week, gone about 10 - 15miles when all the sudden I noticed a stumbling in motor while going up hills. Got where I was going, shut her off and came back a few minutes later, loaded the kids and popped the hood. Nothing obvious but a vac hose from the vac reservoir(?) to TB was a little rough looking. Jumped in, hard to start - low on fuel or ignition and idled at 300 - 400 till throttle got it going. Has started and idled fine ever since. Raced home with the whole 15 miles stumbling up hills - repeated that every drive since after a few miles of driving. Warming the motor up prior to driving doesn't seem to speed up the problem - it takes a few miles to start. Assumed fuel pump at this point.
Got to work on it. Replaced the suspect vacuum hose. Nope. Checked fuel psi - 31 and 40 w/o vacuum. Doesn't hold pressure - reading conflicting things on whether the system should hold psi with key cycle. It doesn't - bleeds to 0 in minute. Replaced fuel filter, regulator and pump. Checked the relay and pump after install - good click and good hum. Felt like problem was gone but I didn't drive more than a few miles each time I checked due to pulling the bed for the tank work. Plus we dropped 30 - 40 degrees while working it.
Never a CEL but decided to checked codes.
Continuous pulled up Neutral Safety Switch that I replaced last year
KOEO - P0232 which I assumed was from pulling the inertia switch multiple times to do the fuel system work
One time I did get P1207(?) Cylinder Head Temp Sensor out of range. Got it once and never again. Curious..
KOER - has never found a problem
The cold seems to have lessened the problem making me think electronics. My BIL is saying #4 or #5 coil or plug. I am starting to feel like I am chasing a gremlin.
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I have a 2001 F150 Supercrew that cranks but will not start after a hard rain. The mechanic checked the gem module and the fuse box, the gem module looked good but the fuse box had some corrosion he thought from water so he replaced the fuse box and had a body shop reseal the windshield. The first time it rained it started right up but after the next rain it would not start. I went out 12 hours later and it fired right up. I wonder if I would be better off taking to a Ford dealer. What to do next.
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2002 4.6L 75K Miles ... Truck has hard time starting if it sits for a few days. Recently had the fuel filter (under driver's door) replaced for first time, and mechanic said it was clogged (?). He also checked fuel pump pressure and said it was good (about 40 lbs). Truck starts OK if used every day. Battery seems OK, as starter turn engine fine. Seems that there's a fuel problem.
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My girlfriend has a 2003 f150 4.6lt pick up its a great truck most of the time. Problem is when the temp gets in the neg double digits it becomes very hard to start it cranks fine but doesnt want to fire. When it does fire it might stall a few times before it stays running. The last cold snap we had I replaced the battery and in the summer the starter got changed. I have heard that this model of truck are known for hard cold starts. I am just wondering if this is true and any other thing besides block heater. It is strange that my 89 gm pickup will start no matter what temp and I'm having problems with the newer truck.
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I have a 1997 f-150, V-6 absolutely base model, a shade under 80,000 miles. I'm the second owner, and the truck was previously garaged most of the time but now sits out in the driveway. The truck has developed an issue where it will be increasingly hard to start (crank crank crank, intermittent cough) after it sits out in hot weather, which is a problem here in Southern California. When the problem is really bad, it can take all day to get it started (try, wait a bit, try again, etc.). When it does finally catch, it sometimes backfires, idles rough for a few seconds then runs like a champ. I can turn it off and restart it immediately, I can let it sit for an hour or three and restart it, but if it sits out in hot weather it gets increasingly hard to start.
I've scoured various forums, and I've tried every solution I can find. Cycling the key to get fuel in the rail, opening the hood to cool off the engine cavity, trying to start it before it gets hot outside, etc. The truck *is* throwing code p0443, and scouring other forums I think that's either the evap canister purge valve, which my last mechanic replaced, or possibly the charcoal canister, which has not been replaced, but I don't know if that could be contributing (the truck was throwing that code before the hard start developed).
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I recently bought a 4.2L V6 2003 F150 with only 20,350 original miles. This car belonged to an older gent who barely used it, then passed on about 3 years ago, and truck sat around barely used by anyone. When I picked it up I ran some Seafoam through the first two gas tanks as it was occasionally running rough and losing power. Since then truck has been running incredibly smooth, but in the last few days it is getting harder to start. If I pumped it two or three times it would start OK, but today I have had to pump it while cranking it to get it to start. ( the pumping may have nothing to do with it starting)
I am replacing the fuel filter in the next couple of days, as any accumulated junk that was in the tank or lines is now probably in the filter, but it seems that a badly clogged filter would also give me some problems running, and it runs really smooth once it starts. I get a pressure gauge, (I understand the rails have a pressure test port) what pressures should I expect at what moments?
Turn key on :
Crank engine :
I am brand new to the F150 and trucks in general.
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I have a 1999 F150 4x4 5.4, I pulled the heads due to blown head gasket. Prior to pulling heads truck started and run fine other than miss on #1 cylinder. I timed the engine according to Haynes manual and posts on this site. Truck is now hard to start and idles very rough. I does seem to smooth out when reving the engine and seems to have plenty of power. Cant find any vacuum leaks or unplugged wires.
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I have a 2002 f350 that has had cold starting issues since I bought it. I have replaced the glow plugs twice, the glow plug solenoid four times. When I put a new solenoid on it it works fine for a short time. I know the solenoids are bad because I get battery voltage on one side and nothing on the other. If I jump the solenoid with a jumper wire I can get the truck to start. I thought I was getting bad solenoids but I have recently tested the activation circuit and am getting constant power there. I.e. It never shuts off. I think this is what is causing the solenoids to burn up. From the tracing of wiring diagrams I have done, the only thing before the solenoid is the Pcm. So now to the question,
1) What controls the activation of the Glow plugs? Is there a temperature sensor or something before the Pcm.
2) Is this a case of my Pcm going out on me? I am a mechanic in the army so I have a decent understanding of mechanics.
However I am at a loss for these systems.
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Well...I had the ECM replaced on my 2002 F150. She ran great for about 60 miles. I had trouble with the key right off at the dealer - it wouldn't start, so I flipped the key over, and it started. Drove about 35 miles, and had starting issues a couple of times, but minor, and over quickly. Came home, and did not drive it for a week. Got in this morning, and it WOULD NOT START. Turned over normal, but won't start. Now I am stuck 15 miles from the dealer who programmed it, and no way to get it there. Anything that I can do to get it started to make the trip?
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I got a new to me 2004 4x4 Excursion v10. 98,000 miles but why it is hard to start when the engine is warm. Starts right up when cold, engine not ambient air temp, idles great once started. In park idles at 1,000 until normal op temp is reach, then down to 750ish. In gear idles right at 650. Drives great. Plenty of power, does not surge, averaging 13.7 mpg over two tanks (70% hwy, 30% city) and no codes. Since it is new to me, and I don't trust people to do maintenance I have:
Replaced spark plugs
Replace downstream o2 sensor (the two upstream were not in stock)
Replaced fuel filter
Replaced belt
Replaced crank sensor (because the belt was already off)
Changed oil (mobile 1 5w20) and filter.
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This is an issue I started chasing after having all the injectors replaced on my aunt's F-350. We had them replaced due to hard/no start on cold (dealership told her they needed to be changed). Unfortunately, I did not get the buzz test results before changing the injectors.
So far that has been replaced:
Injectors
ICP (was leaking)
IPR
both UVCH
IDM (twice)
The issue we are having right now is that only 2 injectors (#6, #7) buzz properly. Initially when we changed the injectors, it did start but didn't seem to run quite right. We did the buzz test and at that time and injectors 1,3,5,6,7 would buzz strong but the rest were weak. After some forum lurking, we suspected that the IDM was faulty. We purchased a refurbished one and after we changed it, only injectors 6,7 would buzz strong. Thinking a faulty IDM was sent it back for a replacement. While waiting, we decided to put the old one back in figuring it would go back as it was before but only 6,7 would buzz strong. We receive the second IDM and same thing, only 6,7 buzz strong. We did a continuity test from the IDM connector and they all get 2.7 ohms (it was an older multimeter so not sure if being .1 under the 2.8-3.6 range is bad).
What I did next is use the uvch external pigtail to test the injectors. I plugged the extra pig tail into the uvch and then the ends of the wires into the plug of the upper harness. Afterwards, I would swap a different injector wire (on the pigtail) to the #6 injector wire (on the upper harness). Whatever injector that would go to #6 would fire correctly. So I know that the injectors themselves are fine. I am suspecting the wiring harnesses (upper/lower) but the continuity test would say otherwise. We also do not get any fault codes except for the EBP occasionally (waiting for a new one). I am lost on what to test or look at next.
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I have a 2002 F150 5.4L (VIN-L) that has been sitting in the driveway since February. I have been a mechanic for 30 years for large commercial trucks, and my own truck has me stumped. I'm sure I've forgotten something but I'll try to list everything I have tried so far. It started with crank no start, no check engine light, checked for trouble codes got a trouble code for the CHT(cylinder head temperature) sensor.
- Replaced the CHT sensor. Cleared codes.
- Dash lights up fine, shows mileage, and anti-theft is not flashing while cranking.
- Fuel Pump does not seem make any sounds. Hit the tank with a hammer. Nothing.
- A little fuel comes out of the schrader valve on the fuel rail when I push on it. I have not checked it with a pressure gauge.
- Attempted to start with ether, nothing, so I'm assuming no spark.
- Fuel pump inertia switch isn't triggered.
- Checked several ground connections to the frame and checked ground connections in the PCM harness. All have less than 5 ohm resistance.
- Unplugged and plugged back in cam shaft sensor.
- Checked voltage on the TPS(throttle position sensor) I'm unsure about the results, if the TPS was bad wouldn't it just idle funny and/or stall?
Fuel Pump and PCM relays in the underhood fuse block appear to be good. All other fuses and relays appear to be good. I have been swapping the relays with one I think is good, although. Searched all over for additional relays, and found 3 inside the cab behind the passenger air-bag. Can't seem to find anything in the Haynes/Chilton manual that lists what they do. They are about half the size of the fuel pump relay.
Manually grounded the fuel pump relay, relay clicks but I don't hear a buzz from the fuel pump. Id like to run 12V to the fuel pump directly to see if that's my issue, but I'm not sure where to connect it without frying something important.
I bought the alldata.com DIY guide for my truck and it hasn't worked much. I have read extensively about others with similar problems and I just don't know what to do next. My main question here is, if the fuel pump is bad, would that stop the spark plugs from working? I'd rather not replace the fuel pump without being absolutely sure.
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I have a recently rebuilt 400 with a mild cam and Tmeyers flat top pistons. The carb is a 600cfm edlebrock that was bought new and installed a few months ago.
The issue I'm having is if I'm driving around and shut it off to run in the store its hard to start when I come back. I end up having to floor the gas to get it to start. When it's cold I tap the gas and turn the key and she lights right off. Could this be an issue with vapor lock? Why does it go away if I floor the gas?
Only other thing going on is when accelerating the engine runs noticeably smoother above 2700rpm. It's a little boggy below that. Probably two different problems but I figured I would throw it out there.
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All of a sudden my 2002 F150 6cyl, will crank but won't start. First thing I did was hook up my timing light to see if I'm getting spark when I crank. Tried a few different plug wires.....no spark. Can a coil just go out like that? I have a multimeter, what do I check to see if the plug that goes to the coil is providing correct power and input?
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The brake lights on my '02 F150 have started flashing spontaneously ie - with no one in truck. This lasts for a few minutes, then stops, but can start again a few minutes later. The fear of course is that someday lights could come on and stay on, resulting in dead battery.
I do have a trailer brake controller that has been on truck ten years. Read something on internet that brake pedal switch might be going bad (??). Any one else observed this strange behavior?
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I recenty replaced the upper intake manifold gasket on my gmc sierra 1500 350 motor. In the process I did plugs and wires and power steering pump. I went through everything and cleaned it to perfection and put it together. It started like a dream and took it for a test burn out in the country. About 15 miles down the road I shut it down and went through all the fluids and upon starting I noticed it was really hard starting. Kinda like it had alot of compression. I just replaced the battery 2 month ago with the best Interstate battery they had and it still checks out good.
Every time I went to start it cold it started normal but when warm it had the same hard starting issue. Well a week later I stopped at the store before work and it did the same but then just rested to a stop and now the starter just clicks every time I turn the key. I can turn the motor over by hand with a wrench and all battery connection are good. I just put a new starter in today thinking that may have been a fluke of a deal but nothing still. I did see when I first tried the new starter that the pulley on the alternator was trying to spin over ever so slowly tell it quit again.
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I am having a problems with my intrigue... Hard to start when warm i checked the pressure reg vac hose found no fuel so im not sure if that is the problem. I have the 3800S11 engine. sometimes it will start when warm other times i need to push the gas a little to get it to start.
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My Camry has 185,809 miles on the 4 cylinder, it has recently started to be hard to start when it's at operating temperature, has code P0301 and p0302 replaced spark plugs at 185,000 miles no change, possibly ignition coils?
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I have a 2010 Toyota Camry LE V4 version, it has about 47k miles on it and about 4.5 yrs old. I have developed a problem over the past few months where the car will crank fine in the morning or when cold (sitting around for several hours or overnight) However if the car is Warm when driven for about 10 miles or more, then parked and then started again in 15-20 minutes it will feel hesitant to start, seems like it takes several cranks before starting and literally feels like it will die while cranking but it will eventually start.
i have the original stock battery, i got it checked at O'Reilly and they confirmed that battery, stater, alternator looked good and cold cranking amps looked good and other items checked out as well fine.
I am not sure what the issue might be at this time, However since the problem is at random and only when outside is like a 100F (which it is not now) and it is warm/hot (driven after 10+ miles), i am not sure what is wrong with the car. I have been using Top Tier gas for the most part, however i had used Arco for about 3-4 months during the Spring/Summer of 2013.
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