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post #1 of 12 Old 07-08-2008, 05:35 PM Thread Starter
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Question choppy acceleration

I posted a thread about a ticking sound, like an exhaust leak, but now it is getting worse and when I accelerate, mainly low rpms, the engine runs smooth but sounds real choppy. It is definately getting worse and I'm afraid to keep driving it but I have to because it is also my work truck I use to pull a 14ft. trailer. Is this an injector issue? Do dealerships charge to pull codes? I have changed the fuel filter about 4,000 miles ago.

1999.5 F350 XLT SD Reg. Cab Long Box 4X4
DP Tuner
6 spd manual
afe Stage II cold air intake
Banks Six Gun tuner (expensive digital gauge)
4" turbo back straight pipe
high pressure crossover line
x-wheel

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post #2 of 12 Old 07-08-2008, 05:37 PM
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Advance Auto Parts doesent charge to pull codes. Thats who I use in a pinch!

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post #3 of 12 Old 07-08-2008, 05:43 PM Thread Starter
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Should I unplug my chip or does it matter?

1999.5 F350 XLT SD Reg. Cab Long Box 4X4
DP Tuner
6 spd manual
afe Stage II cold air intake
Banks Six Gun tuner (expensive digital gauge)
4" turbo back straight pipe
high pressure crossover line
x-wheel

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post #4 of 12 Old 07-11-2008, 07:40 AM
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Quote:
Originally Posted by droobie d View Post
I posted a thread about a ticking sound, like an exhaust leak, but now it is getting worse and when I accelerate, mainly low rpms, the engine runs smooth but sounds real choppy. It is definately getting worse and I'm afraid to keep driving it but I have to because it is also my work truck I use to pull a 14ft. trailer. Is this an injector issue? Do dealerships charge to pull codes? I have changed the fuel filter about 4,000 miles ago.
Sounds like an injector, although if it was, your engine would not be smooth it would be shaking. Might be a GP relay.. You're gonna want to pull codes for sure and maybe to a KOER test

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post #5 of 12 Old 07-11-2008, 08:34 AM Thread Starter
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It doesn't puff any blue smoke, could it possibly be a under valve wire harness issue? What is a KOER test? Would codes pop up if no ses lights are on?

1999.5 F350 XLT SD Reg. Cab Long Box 4X4
DP Tuner
6 spd manual
afe Stage II cold air intake
Banks Six Gun tuner (expensive digital gauge)
4" turbo back straight pipe
high pressure crossover line
x-wheel

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post #6 of 12 Old 07-11-2008, 08:38 AM
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Originally Posted by droobie d View Post
It doesn't puff any blue smoke, could it possibly be a under valve wire harness issue? What is a KOER test? Would codes pop up if no ses lights are on?
It could be a UVCH issue, but that should set codes as well, at least mine did. a KOER is a Key on Engine Running test on the scanner. It checks a number of things while the truck is running and might find what is causing your problem..

And yes, you can have codes without the SES light coming on.

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post #7 of 12 Old 07-11-2008, 01:26 PM Thread Starter
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In the cab it sounds like a helicopter. No shaking no smoke. Its louder when I have my chip on rather then stock setting. Still looking for a scanner but I want to ask my cousins friend if he has one rather than bending over for a dealership scan.

1999.5 F350 XLT SD Reg. Cab Long Box 4X4
DP Tuner
6 spd manual
afe Stage II cold air intake
Banks Six Gun tuner (expensive digital gauge)
4" turbo back straight pipe
high pressure crossover line
x-wheel

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post #8 of 12 Old 07-11-2008, 01:34 PM
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Try to get a video of the sound and get a REAL scanner on it...

Choppy leads me to believe ICP, Fuel and Trans... but we need much more to really help.

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post #9 of 12 Old 07-14-2008, 03:08 PM Thread Starter
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got my truck scanned today, no trouble codes, just P0476 and P0605. He said its prolly an exhaust leak like I thought but been driving it for a week and a half and can't see anywhere it is leaking. Did a buzz test and nothing came back.

1999.5 F350 XLT SD Reg. Cab Long Box 4X4
DP Tuner
6 spd manual
afe Stage II cold air intake
Banks Six Gun tuner (expensive digital gauge)
4" turbo back straight pipe
high pressure crossover line
x-wheel

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post #10 of 12 Old 11-17-2008, 03:59 PM Thread Starter
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so I replaced hpop, ipr, and icp. The sound is like when you stick a playing card in a fan and it hits the blades. ? I also have a slight vibration on the floor. The truck doesn't seem to blow black smoke like it used to when I floor it. Any other possibilities? I took it to a shop and they said it had good oil and fuel pressure. No codes.

1999.5 F350 XLT SD Reg. Cab Long Box 4X4
DP Tuner
6 spd manual
afe Stage II cold air intake
Banks Six Gun tuner (expensive digital gauge)
4" turbo back straight pipe
high pressure crossover line
x-wheel

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