Need help truck missing
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Elder User
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Need help truck missing
Okay here it goes, Kupa'a and I where racing down the road, and as he came up to the side of me I put the pedal to the medal and as soon as I did that, i noticed a slight popping noise. wat da heck?! and after all that excitment I noticed my truck starting to have a miss. It does it in all tunes including stock. So I changed out the fuel filter that was really dirty. After changing out the filter I ran it for about three miles and it was back again. Does anyone know what could be the problem? (It misses really bad just off idle) Any info would be greatly appreciated.
Thanks.
Thanks.
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Elder User
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Okay removed F6 and its still missing. Its more noticeable under light throttle. When I have it in the higher tunes thats when you can really feel it . Feels like a miss at times and it also feels like the throttle/rpm flucuates alot. It almost feels like a really sensetive throttle. Can someone give me some tips on where to start?
Thanks
Thanks
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Thanks I will let you know what I find.
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Thanks
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Senior User
Joined: Oct 2009
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From: Maple Valley, Wa
both a push rod and rocker arms are very easy to fix i just came in the house, im actually in the middle of fixing a bent pushrod right now, for the 3rd time, ha i like to drive fast
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Thanks Roger
Senior User
Joined: Oct 2009
Posts: 138
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From: Maple Valley, Wa
bent push rods and/or broken rocker arms occur when the truck goes past the redline, when as you say put the pedal to the metal and the motor revs up while the transmission downshifts (common depending on your speed) right while the transmission is between gears, it can allow the motor to rev too far and then it breaks push rods or rocker arms, you'll hear a sound like a whomp whomp whomp, it can change a little depending on your exhaust or intake but thats generally what it is, you said you were racing and i can guarantee that this is the problem, you'll have to pull both valve covers then with two fingers pull on each push rod and visually inspect the rockers, the push rods are snug when its right, if your able to move the rod up and down and there is play in it unbolt the rocker arm and pull it out and replace it, new rods are $5 at the stealer, if a rocker is broken go over the head with a fine tooth comb and make sure you get any peices of metal, and the rockers roll on a ball bearing make sure you find that if one is broken. not to bad a couple hours of work if its your first time, while your in there too torque everything back down to spec, all rockers and injectors and do the 50 cent mod as well
Thread Starter
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Elder User
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bent push rods and/or broken rocker arms occur when the truck goes past the redline, when as you say put the pedal to the metal and the motor revs up while the transmission downshifts (common depending on your speed) right while the transmission is between gears, it can allow the motor to rev too far and then it breaks push rods or rocker arms, you'll hear a sound like a whomp whomp whomp, it can change a little depending on your exhaust or intake but thats generally what it is, you said you were racing and i can guarantee that this is the problem, you'll have to pull both valve covers then with two fingers pull on each push rod and visually inspect the rockers, the push rods are snug when its right, if your able to move the rod up and down and there is play in it unbolt the rocker arm and pull it out and replace it, new rods are $5 at the stealer, if a rocker is broken go over the head with a fine tooth comb and make sure you get any peices of metal, and the rockers roll on a ball bearing make sure you find that if one is broken. not to bad a couple hours of work if its your first time, while your in there too torque everything back down to spec, all rockers and injectors and do the 50 cent mod as well
Senior User
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From: Maple Valley, Wa
Im not an expert but based on whats happened i believe it is infact exhaust being forced back out the intake but i may be incorrect im not sure, the 50 cent mod is where you take a quarter and shave it down slightly and it will fit under the electronic harness on the valve cover to prevent it from coming loose, one on each side hence the name 50 cent mod, search the forum for a write up on it and when you take the valve cover off you'll be able to spot right where the quarter goes its pretty easy
Post Fiend
Joined: Mar 2007
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From: Texas
I'll go along with pretty much everything Gagew90 has said. The funny noises I asked about earlier would be the whomp whomp he described. Re-torquing the rocker arm pedestal bolts to 20 ft lbs and the lower injector hold down bolts to 120 in-lbs while you're in there is an excellent idea. I even think it's worth pulling the valve covers just to torque these things down and shim the UVCH connector to prevent future issues.
And AE is Auto Enginuity, a PC based scan tool where you can pull codes, run tests, and read live data on your engine.
And AE is Auto Enginuity, a PC based scan tool where you can pull codes, run tests, and read live data on your engine.