Recently bought a 99 dump. It has a low rpm skip and is starved for power. Taking off at a red light it goes great, but wont climb a hill to save its life. I noticed that 5 coil packs had been changed at some point and others were OEM Motorcraft. Advance only had 3 so i took them, and was going to swap out the OEM coils. I did and it is till skipping. I changed coils around different combinations and they it didnt help. So i am not sure it is the coil packs. When it is in overdrive and i push on the pedal it bucks like hell until it shifts down a gear and then it clears up for the most part, but still doesnt have a ton of power. Almost seems that the more i step on the pedal the less power it has and if i let off on the pedal the rpms climb a bit, but still without a lot of power with a load or going up hills. There is no light on and i dont know what the problem is. Could it be the other two coils need replacing? or even one of the other coils that had been replaced already? Beats me, but i have to get this thing fixed. One code it did read is the intake temp sensor (if i remember correctly) but i dont know if that would cause the skip anyway. Any suggestions........Thanks for the help
Wow, sounds like one I test drove once - it did that and actually wound up leaving me sit, so the dealer had to come get it. Needless to say I didn't buy the truck. Here's hopeing someone has some insight.
There are a lot of possibilities. How is it for normal maintenance?
A couple "easy" possibilities that should be done as normal maintenance are:
- Fuel filter
- O2 sensors
- Test/Clean the MAF
And the intake temp sensor absolutely could be a problem. If the sensor is telling the ECU the air is scorching hot when it actually is not, it will inject way too little fuel.
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'99 F250 V10 Super Cab Long Bed 4x4. '06 short block, PI conversion, modded airbox, 5 Star custom tune, 315/75-16's, 4.30 LSD.
Why, yes, I am some kind of a geek engineer. Thank you for asking.
Recently bought a 99 dump. It has a low rpm skip and is starved for power. Taking off at a red light it goes great, but wont climb a hill to save its life. I noticed that 5 coil packs had been changed at some point and others were OEM Motorcraft. Advance only had 3 so i took them, and was going to swap out the OEM coils. I did and it is till skipping. I changed coils around different combinations and they it didnt help. So i am not sure it is the coil packs. When it is in overdrive and i push on the pedal it bucks like hell until it shifts down a gear and then it clears up for the most part, but still doesnt have a ton of power. Almost seems that the more i step on the pedal the less power it has and if i let off on the pedal the rpms climb a bit, but still without a lot of power with a load or going up hills. There is no light on and i dont know what the problem is. Could it be the other two coils need replacing? or even one of the other coils that had been replaced already? Beats me, but i have to get this thing fixed. One code it did read is the intake temp sensor (if i remember correctly) but i dont know if that would cause the skip anyway. Any suggestions........Thanks for the help
Personnaly I'd reset the pcm and take it for a spin and see if any codes show up. Might want to take a look at all the coils to see if they've been installed to suggested terms
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"The V10 is a better truck, hands down, without question, in all aspects and respects, just is". Ace!
Clean the MAF sensor. Dad's Expedition was acting similar last summer. Turned out to be a dirty MAF. Good luck, John
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2000 Limited Excursion
V10, 4.30 Limited Slip, 127,000 miles
2004 Expedition
5.4,3.73, 214,000 miles
The early bird gets the worm, but the 2nd mouse gets the cheese!
There are a lot of possibilities. How is it for normal maintenance?
A couple "easy" possibilities that should be done as normal maintenance are:
- Fuel filter
- O2 sensors
- Test/Clean the MAF
And the intake temp sensor absolutely could be a problem. If the sensor is telling the ECU the air is scorching hot when it actually is not, it will inject way too little fuel.
Code spit out intake temp sensor. I didnt think that it would cause it to miss. I guess i can change that and see what happens. Service engine light came on yesterday. it is going to be scanned again today so hopefully can figure out whats going on with it. Thanks for the posts!!
Code spit out intake temp sensor. I didnt think that it would cause it to miss. I guess i can change that and see what happens. Service engine light came on yesterday. it is going to be scanned again today so hopefully can figure out whats going on with it. Thanks for the posts!!
service engine light was on for a different reason and this time it didnt have a god for the intake sensor. Dont know why. Light was because i must have knocked of a vacuum line. Reconnected light went out. Back to square one now. Could it be an injector or two? Sucks because there is 10 of everything! I hate taking guesses but computer doesnt help on this. Spent hours on it today...have had it!
I just got my V10 out of the shop for a intermittent misfire. I had replaced all 10 coils, plugs, fuel filter, cleaned MAF, etc, still misfiring.
Ford tech found the #6 Injector harness when wiggled would throw a misfire.
Replaced the plug/pigtail and all is well.
Funny you should type that. I just noticed the clips on a few pigtails i noticed are broken and i thinking that could be a the issue. Where did you buy the pigtails from? Are they only from Ford or aftermarket?
OK now i am getting pissed. All new injectors, pig tails are good to go and still f--kin skips! I sure hope it isnt something internal. Any ideas? All tests come back to the same cylinder. Switched everything with different cylinders and still comes back to the same cylinder being the problem. Someone mentioned something about a service bulletin for that problem and it was an internal fix. Great! I am so happy.
OK now i am getting pissed. All new injectors, pig tails are good to go and still f--kin skips! I sure hope it isnt something internal. Any ideas? All tests come back to the same cylinder. Switched everything with different cylinders and still comes back to the same cylinder being the problem. Someone mentioned something about a service bulletin for that problem and it was an internal fix. Great! I am so happy.
If everything points to one cylinder (you said you swapped parts).
You probably aren't gonna like the fix.
You can start w/ a compression test,then a cylinder leak test.
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