6.4 missing down on the low end.... - Ford Powerstroke Diesel Forum
6.4L Performance Parts Discussion What has or has not worked for you?

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post #1 of 19 Old 03-18-2012, 07:51 AM Thread Starter
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6.4 missing down on the low end....

I purchased my 6.4 back in november and have been adding stuff ever since. So far this is where i'm at; I have a black maxx with the 300 tune, s & b intake, 4'' turbo back straight pipe, cold side pipe, new boots and clamps, and an afe intercooler. After adding the cold side pipe and intercooler I began to miss down low. So thats why I have the boots, thinking there may have been a leak. My question for you guys is did I reach the point where I need a custom tune? The truck ran fine prior to the cold side pipe and intercooler. When I am above 2000 rpm or so and boost kicks in the truck is fine, but down low is stumbles or misses. It doesn't matter which tune I run, I've changed the fuel filters, recently changed the oil, have done a coolant flush and been trying to get this thing in shape. Any advice or feedback would be greatly appreciated. Thanks guys!
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post #2 of 19 Old 03-19-2012, 04:56 PM Thread Starter
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You guys don't have any advice? Anything would be appreciated. I'm new to the diesel world and could use your help.
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post #3 of 19 Old 03-20-2012, 02:56 AM
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If a Diesel motor is stumbling or missing there is a problem. With the limited information you have given it could be anything from fuel to injectors, head gaskets, tuning, wiring.

2008 F450 King Ranch 4X4
H&S Tunes
5" down pipe back exahust
4.30 L/S gears
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265/70R19.5 Michelins
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FASS fuel filter
PTP EGR Delete
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post #4 of 19 Old 03-20-2012, 04:21 AM
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Did you check for codes....if not that would be my first step. It could be a one of, or a combination of problems. Crank, sensor, map sensor, fuel delivery (Injectors) are some possibilities. Does your truck blow smoke upon start up (If so what color)? Rough start? Check your coolant, are you missing any, is so start looking for the source (Head gaskets, cooler?)

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post #5 of 19 Old 03-20-2012, 05:08 PM
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Does the truck actually stumble and have a rough idle, or does it just appear to have a lack of power with no other actual sounds?

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post #6 of 19 Old 03-20-2012, 06:29 PM
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Sounds like ebp sensor cleaning time or turbo actuator acting up

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2008 F350 fx4
S&B intake
8" fab tech
pro comp trac bars
fab tech radias arms
5" turbo back
7" stack
coolant filter
air dog 2
ARP STUDS
EGR delete
CCV filter
Street Diesel big intake and cooler pipe
H&S MINI MAXX 300 tunne
2 10" kicker subs
ALPINE NAV
HID head and fog lights
RECON lights all around
AMP POWER STEPS
20x12 FUEL NUTZ Wheels 38x15.5 20 Mtz
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post #7 of 19 Old 03-20-2012, 06:32 PM
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Quote:
Originally Posted by laynlow transport View Post
Sounds like ebp sensor cleaning time or turbo actuator acting up

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Ditto, a legit possibilty.....I had an isue years ago on my 5.9 that sounds very similiar. It ended up being a map sensor.
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post #8 of 19 Old 03-20-2012, 07:05 PM
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Quote:
Originally Posted by turbo kidd View Post
Ditto, a legit possibilty.....I had an isue years ago on my 5.9 that sounds very similiar. It ended up being a map sensor.
yep map to I forgot ..did both 2 days apart

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2008 F350 fx4
S&B intake
8" fab tech
pro comp trac bars
fab tech radias arms
5" turbo back
7" stack
coolant filter
air dog 2
ARP STUDS
EGR delete
CCV filter
Street Diesel big intake and cooler pipe
H&S MINI MAXX 300 tunne
2 10" kicker subs
ALPINE NAV
HID head and fog lights
RECON lights all around
AMP POWER STEPS
20x12 FUEL NUTZ Wheels 38x15.5 20 Mtz
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post #9 of 19 Old 03-21-2012, 05:27 AM
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Quote:
Originally Posted by laynlow transport View Post
yep map to I forgot ..did both 2 days apart

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Are the map sensor and ebp sensor hard to get to?

08 F350 cc/sb 4X4
h&s minimaxx, 5" flo pro, 4" down pipe, no limit cold air intake, dirty diesel EGR delete with intake elbow, 6.0 exhaust manifolds, custom up pipes, ported intake manifold, Apex 71mm LP turbo, Rudy's cold side pipe, diesel site coolant and transmission filter, diesel site intercooler boots, ccv mod, bilstein shocks, gogo dd solenoid, HID lights, Airdog II 165, PMF traction bars, PMF drag link, moshimoto aluminum radiator
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post #10 of 19 Old 03-21-2012, 05:53 AM
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Quote:
Originally Posted by 04hdfatboy View Post
Are the map sensor and ebp sensor hard to get to?
Ebp is left side close to fire wall at top ..
If u did egr delete it was the small tube that ran off your pipe where u took the lower cooler off ...ford sells the hole tube and sensor or international sells just the sensor 1846480c2 is there number the map is one of the 2 that are just under your intake pipe on top of your intake manifold right side I think it was the one closer to the front of the truck its a three wire sensor 1846481c92 is the international part number I don't have the ford numbers cause its way cheeper from international

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2008 F350 fx4
S&B intake
8" fab tech
pro comp trac bars
fab tech radias arms
5" turbo back
7" stack
coolant filter
air dog 2
ARP STUDS
EGR delete
CCV filter
Street Diesel big intake and cooler pipe
H&S MINI MAXX 300 tunne
2 10" kicker subs
ALPINE NAV
HID head and fog lights
RECON lights all around
AMP POWER STEPS
20x12 FUEL NUTZ Wheels 38x15.5 20 Mtz
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