have a miss

[JustinRhodes]

Truck is missing at about 3/8th throttle and in higher rpms pretty bad. What's some possible causes? I was thinking valves needing adjusting. Ive replaced fuel filter, and checked fuel psi and its fine

[thrashingcows]

Well when was the last time of a valve adjustment? Usually you won't get a miss though with valves out of adjustment. Might be a bad injector? Try cracking open each injector while it's running and listen for the tone of the engine to change. If it does not change then you have a dead injector.

[ahale2772]

I agree, a miss would probably not be from the valve unless it was severly burnt, most likely an injector

[VanillaGorilla]

I'm having this problem, went to leave the jobsite the other day and there's about a 6" round wet spot under the motor, damn. fire it up and go to leave and at about the same spot un the throttle you mention it's missing and would smoke a light color if I stayed in it too long. Baby it home and find I have a fuel leak sucking air and it's the same symptoms as a bad injector but the leak tells me that's the problem, look it over good.

[oldestof11]

My solenoid on my injection pump was going out and produced the same problems.

[JustinRhodes]

Well when was the last time of a valve adjustment? Usually you won't get a miss though with valves out of adjustment. Might be a bad injector? Try cracking open each injector while it's running and listen for the tone of the engine to change. If it does not change then you have a dead injector.

i have not checked the valve adjustment since ive owned the truck , i got new injectors (sdx 5x.016s for my birthday so ill throw em in there and see what happens. After i pull the injectors tomorrow ill probably test mine out at school monday.

I'm having this problem, went to leave the jobsite the other day and there's about a 6" round wet spot under the motor, damn. fire it up and go to leave and at about the same spot un the throttle you mention it's missing and would smoke a light color if I stayed in it too long. Baby it home and find I have a fuel leak sucking air and it's the same symptoms as a bad injector but the leak tells me that's the problem, look it over good.

my truck starts up in half a crank, and doesnt leak fuel. could it still be sucking air if its easy starting and doesnt leak fuel?

My solenoid on my injection pump was going out and produced the same problems.

if problem persists ill probably just pull cable it to eliminate that.

[VanillaGorilla]

I don't know enough about these things to say if it'd be sucking air but not leaking, mine also started on the first crank like always, it was when I tried to get up to hwy speed (didn't happen took back roads lol) that I noticed a problem with a miss.

[JustinRhodes]

My solenoid on my injection pump was going out and produced the same problems.

the shutoff solenoid? how long did it do that before it finally went out or did you change it? thinking maybe its time to join the pull cable club
Also did it seem like your truck was lacking in fuel up top?

[oldestof11]

Mine went out about 2 months before I started having problems.

Mine I think was due to a poor electrical connection. Andrew can vouch for that. I definitely lost top end. I had just installed the 4200 rpm spring and we got to romping on it when we left SOP. Mine fell so hard on its face it was worse than the 1.6L IDI VW diesel I had with all of its mighty 52hp...

We pulled over and I wiggled the connection, viola! I had my full rpm range back.

About a couple weeks later, my truck start mising, no power above 2000rpms and if it did get up there, it would buck and surge. I pulled into my parents drive, got out the chisel, and 20 mins later, it was gutted. I cut the 2 ends off the electrical wires there and added some male/female spades to connect them.

[JustinRhodes]

Mine went out about 2 months before I started having problems.

Mine I think was due to a poor electrical connection. Andrew can vouch for that. I definitely lost top end. I had just installed the 4200 rpm spring and we got to romping on it when we left SOP. Mine fell so hard on its face it was worse than the 1.6L IDI VW diesel I had with all of its mighty 52hp...

We pulled over and I wiggled the connection, viola! I had my full rpm range back.

About a couple weeks later, my truck start mising, no power above 2000rpms and if it did get up there, it would buck and surge. I pulled into my parents drive, got out the chisel, and 20 mins later, it was gutted. I cut the 2 ends off the electrical wires there and added some male/female spades to connect them.

Thats exactly what mine is doing, hopefully thats what my problem is. later today im going to run to a buddys and get my other solenoid. Did yours fuel real hard down low and then when it starts climbing it just ran out of power. Man i hope this is what it is, been fooling with my truck for a little while now trying to get it straightened out.

[PToombs]

Jon, I think the connections didn't loosen themselves at SOP, I saw somebody under your hood that wasn't you. Or me either.