'99 f250 v10 missing

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May 6, 2012 | 07:12 PM

justgunner

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From: west virginia

'99 f250 v10 missing

truck starts fine runs good at idle, and low slow speed,. i can pull out of my neighborhood and get to 50-55 mph no real issue,.i step on the gas then hesitation, missing ect,.,.i can cruse on the interstate 70 no issue steo pn the gas it hesitates and misses,. it seems to happen mostly at 1150-1950 rpm,. hill climbing is a torture,.hit passing gear and speeds right up,.is it the cops or one of them ,.new injectors installed ,.told that was it ,.paid good money for that and no change,.and no i did not change my plugs ,.i was told injectors,.so what do you think thanks Gunner

May 6, 2012 | 07:37 PM

Kdr358

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From: West of Chicago

When were the plugs last changed? How many miles are on the truck? Usually fuel injectors last 200,000 + miles. I do you have Any check engine light on? I would start by inspecting each coil boot. Sometimes thers cracks that develop over time. If you have a check engine light on or any codes it should tell you wich cylender or cylenders hdve a misfire. There is no need to replace all of The cop's but that's up to you!

May 6, 2012 | 07:53 PM

justgunner

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From: west virginia

not sure

the plugs were changed before my first tour in iraq,.i returned and went back 3 months later then i've been back 8 mos ,.120,000 miles on the truck,.no light untill this week after the injector change. two days after ,. service engine soon light has come on,.truck did sit while i was gone ,.started from time to time,.also after a long run on the interstate ,.it really runs worse,.tell me what to do first and i will ,.plugs and boots??

May 6, 2012 | 08:20 PM

Kdr358

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From: West of Chicago

Stop by any auto parts store and they will read the codes and it will tell you more about what's going on. The cop's themselves are able to be wiggled around to get them out without removing the fuel rail. They are 7mm screws that hold them down. Look at the ends of each boot for cracks and replace the cracked boots or I usually do all if one is cracked. As for the coil pack itself depending on wich cylender or cylenders are mis-firing the pulled codes will tell you wich ones to replace! I would also look for coolant or oil In The spark plug wells. And when you re install The cop boots be sure to use plenty of dielectric grease on The tips as this keeps moisture out and next plug service they won't tear! Good luck! And most importantly, Thank You for your service!

May 6, 2012 | 09:43 PM

demonhead

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What does it mean if there is oil in one of the spark plug wells?

May 6, 2012 | 10:50 PM

Kdr358

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From: West of Chicago

Quote:

Originally Posted by demonhead

What does it mean if there is oil in one of the spark plug wells?

When it happend to my old V10 I had to change the valve cover gaskets. and the COP boot was very cracked and dry wich I assumed let oil drip in there over time is my guess since it was the #10 cylinder. I thought it was a rear main seal but upon inspection of what was left of the gasket near the #10 cylinder there was a large crack in it causing oil to run down the back of the motor.

May 7, 2012 | 08:48 AM

jh818

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From: Chino, California

When was the last time you changed your fuel filter? Give that a try first. It's a common maintenance item to replace.

If no change, get a fuel pressure gauge and see if you're getting adequate pressure when it hesitates.

I wonder if it could also be your TPS?