7.3 and Hills - Page 2

**BroncoHauler** · 08-30-2015, 08:19 PM

Quote:

Originally Posted by BajaSportsmobile

...I had to purchase a '95 F350 4X4 CrewCab yesterday...

7.3L IDI ?

TexGX · 08-30-2015, 08:28 PM

Now should I think about a full float rear axial while I am doing this?

TexGX

BajaSportsmobile · 08-30-2015, 08:29 PM

Quote:

Originally Posted by BroncoHauler

7.3L IDI ?

The 7.3L Power Stroke diesel was available from September of 1994 Until April of 2003 in Ford Econoline vans and Ford Heavy Duty pickups. It does not have an intercooler though which didn't come out until 99 in the trucks and never in the vans.

BajaSportsmobile · 08-30-2015, 08:33 PM

Quote:

Originally Posted by TexGX

Now should I think about a full float rear axial while I am doing this?

TexGX

I have several available for sale completely rebuilt with your choice of gear ratio and differential - Detroit or Grizzly Locker with 35 Spline HD axles or 32 spline ARB... just about any combination wanted.

REF · 08-30-2015, 08:56 PM

That's tempting.....just read this thread before you do anything.
viewtopic.php?t=14232
I put a 4" on my 7.3 along with a DP tuner, lots more power but I still have to watch the EGT's while going up the passes and ease off a bit, get a little more black smoke too, but that's to be expected, it's an oil burner after all. I think I have a magnaflow, good stuff. I also insulated my doghouse and front floor with dynamat and dynapad, helped with heat and noise. Nothing I've found to let in more air short of using good filters, tried K&N, took them out as most diesel heads don't like them.....went with Napa gold.

TexGX · 08-30-2015, 09:27 PM

Ramsey,

I will give you a call for prices and ideas.

REF,

Great read. I will have to think about it.

TexGX

E350 · 08-30-2015, 11:28 PM

TexGX: It sounds like a fuel starvation issue to me. Going up hills your truck drinks more diesel. Low fuel pressure or a clogged fuel filter, or a delaminating tank will starve the injectors for fuel. As a suggestion, you may want to install a fuel pressure gauge before you do any thing. BTW Hwy 50 to S.Lake Tahoe can get steep. No problems when I was driving my 7.3 including when towing a full one yard tandem cement mixer. EDIT: AND WITH 3.55 GEARING.

Photoventurer · 08-31-2015, 04:05 AM

I'll second what E350 said. I have a 2000 7.3 with similar issues. What I am finding through research and much trial and error is that it is definitely a fuel supply problem. Search fuel tank delamination and 7.3 fuel issues online and you'll likely find your symptoms are very similar.

TexGX · 08-31-2015, 06:48 AM

I don't think it is a fuel issue. I feel like I have the power, but the EGT gauge goes off. When it is cold outside, this is less of an issue. My feeling was the gearing is wrong for the weight of the van and the engine was working too hard and building heat. I like to cruise at 70 or 75 and don't want to sacrifice fuel economy either.

TexGX

carringb · 08-31-2015, 11:04 AM

Fuel starvation won't cause high EGTs. Takes fuel to make heat, and diesels don't run too lean like motors.

If your gears are too tall, and its downshifting a lot to make enough power, lower gears can improve fuel economy by keeping you Overdrive more. Also, too tall gearing is pretty rough on the transmission because has to rely much more on the torque converter when launching from a stop, and the diesel programming allows it to unlock while climbing at some speeds, also to make more power.