negative boost pressure - Ford Powerstroke Diesel Forum
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post #1 of 75 Old 12-05-2012, 11:22 PM Thread Starter
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negative boost pressure

Ok, my boost pressure gauge is showing up to a negative 2 before start and at idle, not positive boost, negative. I have replaced the map sensor with 2 different new sensors and that did not change anything. It is a E 99 with a 2000 model year computer and this problem has plagued me since I bought the truck where it seems to run extremely rich.

Any ideas would be appreciated, In addition to this problem I have lost 4 mpg

E '99 F-350 SRW crew cab, Termy T-500, AIS intake with zoodad mod, t/s chip in a 2000 computer tuned by Farmer on Farmers 160/100 single shot injectors, A-pillar tripod with boost, pyro, and termy gauges, red top batteries, Ceramic clutch, GTP 38 R, Bellowed up-pipes, Dieselorings.com fuel pressure relief kit and 3 1/2 in. straight piped.
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next step is fuel bowl delete
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post #2 of 75 Old 12-05-2012, 11:24 PM
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You won't be building any sort of boost at idle.


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post #3 of 75 Old 12-05-2012, 11:31 PM Thread Starter
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No I shouldn't, but it shouldn't be negative either. In addition the loss of fuel mileage.

E '99 F-350 SRW crew cab, Termy T-500, AIS intake with zoodad mod, t/s chip in a 2000 computer tuned by Farmer on Farmers 160/100 single shot injectors, A-pillar tripod with boost, pyro, and termy gauges, red top batteries, Ceramic clutch, GTP 38 R, Bellowed up-pipes, Dieselorings.com fuel pressure relief kit and 3 1/2 in. straight piped.
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next step is fuel bowl delete
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post #4 of 75 Old 12-06-2012, 12:23 AM
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It's impossible to build vacuum on a diesel, that's why we require hydro boost for brakes, and have a vac pump.


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Autometer - Boost, Pyro
TW 6 Pos Chip
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post #5 of 75 Old 12-06-2012, 12:30 AM Thread Starter
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Quote:
Originally Posted by Young-SC-Owner View Post
It's impossible to build vacuum on a diesel, that's why we require hydro boost for brakes, and have a vac pump.


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True, but that is not the concern though

E '99 F-350 SRW crew cab, Termy T-500, AIS intake with zoodad mod, t/s chip in a 2000 computer tuned by Farmer on Farmers 160/100 single shot injectors, A-pillar tripod with boost, pyro, and termy gauges, red top batteries, Ceramic clutch, GTP 38 R, Bellowed up-pipes, Dieselorings.com fuel pressure relief kit and 3 1/2 in. straight piped.
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post #6 of 75 Old 12-06-2012, 12:32 AM
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What's the concern then


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99.5 F-350 SRW Short Bed, Ex Cab.
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Wicked Wheel'd,
Southbend
Autometer - Boost, Pyro
TW 6 Pos Chip
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post #7 of 75 Old 12-06-2012, 12:37 AM Thread Starter
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what is causing the poor fuel mileage, the negative boost reading and the unburnt "rich" diesel smell at the exhaust. trying to figure out what has changed that caused the fuel mileage to take a dump after upgrading the turbo to a 38r. I lost 6 mpg and we cant find why it is doing what it is doing and why it is dumping so much unburnt diesel through the exhaust.

E '99 F-350 SRW crew cab, Termy T-500, AIS intake with zoodad mod, t/s chip in a 2000 computer tuned by Farmer on Farmers 160/100 single shot injectors, A-pillar tripod with boost, pyro, and termy gauges, red top batteries, Ceramic clutch, GTP 38 R, Bellowed up-pipes, Dieselorings.com fuel pressure relief kit and 3 1/2 in. straight piped.
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post #8 of 75 Old 12-06-2012, 12:45 AM
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Have you changed anything other than a turbo? Are you in a northern state? Possibly switched to winter blend? I said before, you CAN'T have a neg boost reading it's probably just a sensor or gage anomaly.


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99.5 F-350 SRW Short Bed, Ex Cab.
6637
Wicked Wheel'd,
Southbend
Autometer - Boost, Pyro
TW 6 Pos Chip
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post #9 of 75 Old 12-06-2012, 04:17 AM
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I think you have two unrelated issues here and you're just pissing money away at MAP sensors without a diagnosis. Plus, with a manual boost gauge, it shouldn't read from the MAP sensor. Sounds to me like your boost gauge is screwed up.

I've never heard of "Farmer on Farmers" tuning, perhaps that is the issue...?

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post #10 of 75 Old 12-06-2012, 05:45 AM
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Quote:
Originally Posted by Zaairman View Post
I think you have two unrelated issues here and you're just pissing money away at MAP sensors without a diagnosis. Plus, with a manual boost gauge, it shouldn't read from the MAP sensor. Sounds to me like your boost gauge is screwed up.

I've never heard of "Farmer on Farmers" tuning, perhaps that is the issue...?
Unless he deleted a post, I see nothing that correlates to your reply!
But I totally agree with given info


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99.5 F-350 SRW Short Bed, Ex Cab.
6637
Wicked Wheel'd,
Southbend
Autometer - Boost, Pyro
TW 6 Pos Chip
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