Couple ??'s For All You Deisel Folks

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Couple ??'s For All You Deisel Folks

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Couple ??'s For All You Deisel Folks - 4/16/2008 1:22:29 PM

sowaxeman

Posts: 3897
Joined: 3/31/2005
From: Indianapolis, IN
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I bought my first Deisel, so I have a few questions I'm hoping you all can chime in with and help me out

The truck is a 1994 F-350 Dually w/7.3L Turbo. I drove it home from Florida and only got about 15mpg's on the highway at about 67 mph while turning 2500 rpms. I was expecting a little more. Does 15 sound average? Are there any tricks/tunes/mods that I could do to help in that department?

In the cab of this truck there is a small rubber tube under the dash, with a dial and vaccuum style connector at the end of. When I turn the dial to the open position I can hear air hissing out of it (not being sucked in) when the engine is running. This comes through the firewall and appears to connect to a T in a line that runs from the intake runner (after the turbo and airbox). What the heck is this gizmo for?

Also in the cab of the truck is an aftermarket light, that comes on when the truck is first started and remains lit for a minute or so and then goes off. I traced the wire and it appears to be connected to the coil on top of the motor. What is this light for - oil temp or pressure check or something?

Thats about it for now - any help you all can provide will be much appreciated.

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Post #: 1

RE: Couple ??'s For All You Deisel Folks - 4/16/2008 1:35:18 PM

SVTBill

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Joined: 9/17/2006
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i thought ford's 7.3 was a n/a engine. if it was and the previous owner turbo'd it, then it might have bigger fuel pumps and injectors and thats why you are getting reduced mpg....just throwing that out there, no idea really

i dont have any idea about the other things

btw, i expect to see pictures of this thing fully detailed

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RE: Couple ??'s For All You Deisel Folks - 4/16/2008 1:48:42 PM

OT LOVER

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Joined: 1/5/2007
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The light is the coil heater indicator thingie. I know hubby tells me not to start it til the light goes out. Just turn the key on but dont start it til the light is out.

(in reply to SVTBill)

Post #: 3

RE: Couple ??'s For All You Deisel Folks - 4/16/2008 1:58:48 PM

sowaxeman

Posts: 3897
Joined: 3/31/2005
From: Indianapolis, IN
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quote:

ORIGINAL: OT LOVER

The light is the coil heater indicator thingie. I know hubby tells me not to start it til the light goes out. Just turn the key on but dont start it til the light is out.

Nope - I think you are thinking of the Glow Plug Indicator....my truck has the WAIT TO START light in the dash, which I obey and don't start until this goes out. The light I am talking about is definitely an add-on (its mounted beneath the dash), and it does not come on until the engine is started and then remains lit for a minute or so.

As for the turbo - 1994 was the first year for factory turbo's and this one is a stock turbo. From what I hear the turbos actually get better mileage than the n/a's

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Post #: 4

RE: Couple ??'s For All You Deisel Folks - 4/16/2008 2:00:36 PM

sowaxeman

Posts: 3897
Joined: 3/31/2005
From: Indianapolis, IN
Status: offline

quote:

ORIGINAL: SVTBill

btw, i expect to see pictures of this thing fully detailed

You know how big of a project that will be

I'll do the interior, but not sure I will be 4 stepping the paint anytime soon

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Post #: 5

RE: Couple ??'s For All You Deisel Folks - 4/16/2008 2:05:23 PM

OT LOVER

Posts: -17
Joined: 1/5/2007
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quote:

ORIGINAL: sowaxeman

quote:

ORIGINAL: OT LOVER

The light is the coil heater indicator thingie. I know hubby tells me not to start it til the light goes out. Just turn the key on but dont start it til the light is out.

Nope - I think you are thinking of the Glow Plug Indicator....my truck has the WAIT TO START light in the dash, which I obey and don't start until this goes out. The light I am talking about is definitely an add-on (its mounted beneath the dash), and it does not come on until the engine is started and then remains lit for a minute or so.

As for the turbo - 1994 was the first year for factory turbo's and this one is a stock turbo. From what I hear the turbos actually get better mileage than the n/a's

haha yeah, you are right. oops.

I think hubby gets about 16 mpg in his 02 f250. It had the quadzilla tuner thing, but it seems to make it worse on fuel..................but it does make it go. He keeps it turned off most of the time.

< Message edited by OT LOVER -- 4/16/2008 2:19:14 PM >

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Post #: 6

RE: Couple ??'s For All You Deisel Folks - 4/16/2008 2:05:50 PM

Jugador

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Joined: 7/20/2003
From: Bangladesh
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sounds like a vacuum bleeder just from my boost experience. it leaks off pressure in the vacuum system so the wastegate thinks there is less boost being made and it gets tricked into boosting the turbo higher. does it do better on fuel closed off or did you not mess with it much while driving?

im not sure if they started intercooling in 94 (i thought they started in 97 or 98 but might be thinking of cummins not the powerstroke), you might want to get one just to lower intake air temperatures.

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RE: Couple ??'s For All You Deisel Folks - 4/16/2008 2:23:47 PM

josmoe5000

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Joined: 5/16/2007
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quote:

ORIGINAL: sowaxeman

I bought my first Deisel

Diesel, I before E except after C, or if it sounds like an A like neighbor or weigh.

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RE: Couple ??'s For All You Deisel Folks - 4/16/2008 2:49:29 PM

19stang66

Posts: 1005
Joined: 2/22/2006
From: SE Minnesota
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quote:

ORIGINAL: josmoe5000

quote:

ORIGINAL: sowaxeman

I bought my first Deisel

or if it sounds like an A like neighbor or weigh.

never heard that one before. Learn something new everyday!

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RE: Couple ??'s For All You Deisel Folks - 4/16/2008 7:58:44 PM

SVTBill

Posts: 2360
Joined: 9/17/2006
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quote:

ORIGINAL: sowaxeman

quote:

ORIGINAL: SVTBill

btw, i expect to see pictures of this thing fully detailed

You know how big of a project that will be I'll do the interior, but not sure I will be 4 stepping the paint anytime soon

after the interior just clay and poliseal it or something easy.

congrats on the purchase, btw!

i have a gasoline base model 07 f250 as a rental right now, it's def. different to drive than a mustang

_____________________________

-mac cai
-Bassani o/r x
-super 40s w/ slp tips

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Post #: 10

RE: Couple ??'s For All You Deisel Folks - 4/16/2008 8:33:43 PM

mustangman02232

Posts: 11995
Joined: 12/22/2004
From: Ludlow, Mass
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93 the turbo was optional, 94 it became standard, and 95 was the first year of the powerstroke.... that milage sounds about right for a dually,

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RE: Couple ??'s For All You Deisel Folks - 4/16/2008 9:17:15 PM

crazy horse

Posts: 148
Joined: 5/31/2006
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turbo was an option 93-94
powerstroke in 94.5
not sure about intercooler

Dodge put an intercooler on the Cummins in 91

The Powerstrokes don't do that great on mileage. I'd think a 7.3 would be a little higher but the dually may be making up for it.

I need to find me a 12v Cummins tho

too bad having to buy a $4000 tranny will make up for all the free mods

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Post #: 12

RE: Couple ??'s For All You Deisel Folks - 4/18/2008 8:31:19 AM

sowaxeman

Posts: 3897
Joined: 3/31/2005
From: Indianapolis, IN
Status: offline

Just thought I would post what I learned over at Ford Truck Enthusiast:

*The tube gizmo is for an aftermarket boost gauge

*The light is for the glow plug cycle, so I guess that means I have a WAIT TO START light and then a WAIT TO DRIVE light.

*Ford switched from IDI (In-Direct Injection) to the PowerStroke direct injection mid-year 1994 (or I guess Navistar did) Based on the VIN check, my truck is a 1994.5 with a Powerstroke which I recon is a good thing.

*Based on the rpm's at 65mph everyone over there is guessing I have the 4.10 rear which is meant for hauling not speeding

So ~16 mpg is about average at 65-70 mph. I guess if I want to drive 55-60 with the trailer it will do pretty well compared to the Navi

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Post #: 13