I changed plugs last week now all of the sudden the truck is stalling on me while traveling down the highway. I was on my way to work this morning and it stalled while I was doing 65 mph. I've changed plugs before and never had a problem like this. What I have is a 2001 F250 V10 with a Kenne Bell SC. The only difference this time when changing plugs was that I had to remove the supercharger to gain access to the drivers side plugs. I was very meticulous when doing this, I checked and then rechecked everything and then checked again. All connections are tight, no vacuum leaks and no visible problems that I can find. What sucks is that I'm not getting any check engine light while driving, it just stalls. The only other thing I did after changing the plugs was to change the fuel filter. Other than the plugs and fuel filter I haven't done anything else to it. I did not have this problem before I changed the plugs so something happened afterward. The guy that did my SCT tune thought it might be the IAC valve so I replaced it yesterday as well as cleaned my mass air meter and that did absolutely nothing. I'm at a loss, anyone have any ideas? I have to get this fixed soon because I have a road trip coming up.

 

When it stalls, can you re-start it right away?, or is it a crank-no start.

 

All I have to do is throw it back into park and it starts right back up. I was talking to shop tech buddy of mine and he said it might be the EEC power relay. I'll check that out when I get home from work, process of elimination I guess.

 

You changed the fuel filter any possibility that you reversed the flow.
Don't the fuel filters have a arrow showing direction.
Possible crank position sensor failure ,but intermitent.
chk that you didn't disturb the cht (cyinder head temp sensor) or connector.
You may not get a light or a code until after so many drive cycles.
Rich

 

Do you use a plug-in chip for the computer or do you do the "tuner" thing ?

I had almost the same exact problem with a bad Superchips - it would just die. No codes, nothing. It would always restart, but randomly die again. Turned out the Superchips was crashing the computer, it would reboot (within microseconds apparently) and come back to life. Just enough to stall it.

But that wouldn't just happen after changing the plugs.

Weird... I'd look at whatever wiring was near where you were working.

When you say it restarts, do you cycle the key to off? Or just put it in Park/Neutral and turn right to start without going to Off first?

art k.

 

Rich,
I've changed the fuel filter plenty of times, it only snaps into the holder one way so it's kind of hard to put it in backwards. I double checked and triple checked every connection that I can find, nothing loose or disconnected.

Art,
I have a plug in chip. I talked to the folks at Nology (where I got the plugs) and asked them if they have any known problems with these plugs (Beru Silverstones S1K) in vehicles with my setup and the guy said none that he knows of. He did however tell me that what could possibly be happening is that since these plugs are a non-resistor plug and the fact that I have a plug in chip that there could be some interference being caused because of the extra spark that these plugs create. Not sure if you've heard of these plugs but they have a solid sterling silver electrode which from what I've read is the most conductive metal thus creating much more spark than your normal plug. The guy I talked to indicated that usually the only place you might notice some interference is in your radio but he also said that it's possible for interference to be created between the chip and the computer. I'm taking the truck to the guy that did my tune and he is going to flash my computer with the tune he created on the chip and see if that eliminates the problem. If it still acts up with the chip removed and the computer flashed, then I have other issues. I'm pretty sure the chip itself is not messed up because I unplugged it and plugged in the chip from Kenne Bell and it does the same thing. It is just too coincidental that my problems started after I changed the plugs. To answer your last question, when the truck stalls I have to put it in park or neutral and turn the key to the off position before it will start back up. If I try to start it from the on position it just sits there and cranks but won't start, just like it is not getting fuel. As soon as I turn the key off and then try to start it, it fires right up. This one has me stumped and I'm running out of things to check. It is probably something really simple too.

 

Iwas thinking maybe fuel pump but the fact that it starts right up after turning the key off on killed that. Sounds like electrical issue. Does the truck slowly die like 5-10 seconds of lean condition. I once had a bad o2 that was shorted to the heater wires internally and I would get 300 yards and have to shut the key off and back on while on the highway to reset the puter to go another 300 yards, that was hard to find and is really rare. You might have to put original plugs back in it. Those engines like those double platinum plugs from ford, you may have interferance shutting the puter down.

Shutting off the key resets the puter.

Dick

 

Time will tell, I'm getting the computer flashed today with the program that is on the chip so I can remove the chip to see if that is the problem. The weird thing about this whole mess is that right after I changed the plugs and fuel filter last Tuesday I went on a 400 mile (one way) trip and the truck ran great up until about the 360 mile mark. At that point is when I stopped to fill up with gas and as soon as I pulled out of the gas station is when the truck stalled on me for the first time. You would think I just got a bad batch of gas but the engine has been messing up ever since. With the new plugs I was quite pleased with my mileage, almost 12.5 mpg, for this truck that is good especially with the supercharger.

 

Oh! well thats a little different. So how does it die? Slow or fast?
You would think it had something to do with the gas for sure....Hmmmmm
How long does it take for it to happen now? is it repeatable like clockwork?

 

I am betting that the plugs are the problem. I know that it is a pain, but the first thing that I would do is re-install the original plugs and see what happens. If it doesn't fix it, it won't hurt it and the results will tell a lot about what may be wrong.

 

Alright, if you used a different chip and it still did it, it probably ain't the chip. Although if you have a dirty "finger" on the edge-board connector it'll still screw up with a different chip.

I don't see the plugs doing it though - it's a complete stall at highway speeds? That's not the plugs... at least, I wouldn't think so.

KEEP US INFORMED....

 

These aren't bosch plugs are they? There is a known problem with bosch plugs not working in the cop ignitions.
Let us know what you find.
Rich

 

Yeah, but that's usually one plug misfiring or something like that, not stalling "at speed" so to speak.

 

OKay,I had a brain fart I don't get many but now and then!

Soccer mom! LOL

ART
You fix that heat yet? Was the valve bad?

Rich

 

Been getting my mother-in-law's heat and hot water going after getting 2 feet of water in her basement...

I'll start on mine this weekend.

My wife puts out enough BTU's to heat the bedroom at night, as long as it's above 40 degrees

ak