95 7.3 PS lope and power loss - Ford Powerstroke Diesel Forum
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  #1  
Old 12-26-2007, 02:39 PM
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95 7.3 PS lope and power loss

After a few hours of reading I'm ready to ask....
but first some history.
My 95 7.3PS I got 1000 kms ago is not running right now.
A month ago I went and started the engine up and as I was walking away (cold in AM) the engine rattled and shut off.
Getting into the cab the Service Engine Lite is ON.
Turn off key and restart engine runs fine for most part BUT does give me SES lite a couple times that day.
Then before I can determine my issue the E4OD trans lets go.
One AM slow going into gear and then after a day or so of that nothin'.
Well not nothin' just no fwd no reverse.
Neutral works fine ;-)
So $3000 later I have movement again AND the SES lite is indicating intermittently.
When the lite goes ON the engine lopes like a bad valve in a gas engine and rattles. It has almost no power and barely enough to make an incline at slow speed.

This happened yesterday (Christmas so that makes sence) I was driving and the engine lite came on.
By decelerating the lite sometimes goes off sometimes slipping to N and then reving to 2500 clears the rough running and upon decel the lite goes out.
Putting back into gear sometimes the lite will come on as soon as I apply any load to the engine.
So simply accelerating causes the engine to stumble, rattle and severe loss of power.

A few pulls over to roadside and restarts the lite is out but upon acceleration slips into the lope mode.
Eventually things settled down enough that I left it idling for a few hrs while attending xmas rituals.

Ran all day in driveway fine but as soon as I'm out on road the stumble lope begins.

Whats known.
It does have a leak on rear of valley. Fwd seems dry.
Rear can be Turbo I read but this is fuel thats dripping off rear pass side of engine.
This is not a leak I can see so it may be a line under the pump.
I have not pulled the codes and while I have looked at the Actron 9145 scanners I am reluctant to spend $$ on a tool today when I'll likely need that $100 for a part.
Question is which part?
I'm a fair decent gas mech so I can probly change the part - I'm wondering if anyone has any insight for me before I get started.
Today the lite is on will not shut off nor will it easily start.

Thanks!
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  #2  
Old 12-26-2007, 03:16 PM
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well to start with , your going in blind without knowing what codes are in the pcm, so first off , take it to autozone and get them to pull the codes for free ,then lets see where we need to go from there , post up the codes , as far as you rleak goes , the big nut on the back of the fuel pump in the valey could be slightly loose , make sure its tight ,the pumps are bad to leak also, out of the weephole in the side
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Old 12-27-2007, 08:10 AM
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Thanks for the reply and info.
I am unable to go to Autozone for two reasons.
1) the truck will not stay running
2) I am in Canada ergo no AZ.

So I am still hoping for some guidance/insight/info should tightening that nut not be my issue.
Stormy as Jupiter here today so I'm on the information dig rather than applying any info I have.
Thanks!
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Old 12-27-2007, 08:17 AM
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sounds like your sucking air from a fuel leak. Can't tell ya where to look but just find that leak and you'll fix that problem and probably the entire problem.
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Old 12-27-2007, 09:09 AM
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defintly need to get fuel leak fixed , do i think thats your problem , no a fuel leak will not cause a check engine light ,i think that you have short harness problems but dont want to say until you get codes puled , youll be wasting alot of time to try and make repairs without codes
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Old 12-29-2007, 05:21 PM
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Well I was able to get some time to troubleshoot today.
Update
The leak I thought I had must have been from bleeding off the filter at the tire valve fitting.
This is based on the fact that when I left it running xmas day the truck was slightly angled.
This angle appears to have let all the wetness to leave the valley.
Completely dry back there till I happened to release fuel into the valley myself.

Still unable to start and stay running.
Runs fine for a second then stumbles and knocks and SES lite comes on.

Today I opened the fuel filter on my DIT 7.3 and found the filter stem was allready broken off at the water in fuel indicator plate.
How the heck does that werk???
So if anybody happens to have a good filter stem/stand/post/tube I am looking for one.
Its a reverse thread for those who don't already know.
There was no water and no real dirt to speak of.
A very fine layer of silt and not much else was evident.

The way its looking is I will have to tow it to a shop next week to have codes pulled.

I have the Haynes manual on loan to me and I've read quite a bit online as well.
Could someone explain to me the path of the fuel.
Obviously I see from tanks fuel is pulled by pump into filter housing where the housing fills and enters the "gizmo" on side of housing that I imagine is the HiPressure pump for the fuel.
Dunno.
From there I think fuel enters two rails one each bank that feed four injectors each.
Does fuel "return" to pump or tank or return at all?

"IF" I have air now in the filter housing what is the procedure to purge that?


While I doubt it could my issue be old dirty oil?
I'm told it looks fine and is Full of 15 40 and its currently ~40F maybe 35F.

Keep in mind my engine will run right for the first second then SES and knocking and lope begins.
Finding a shop thats open is going to be a week away almost so if I could fix it before then....
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Old 12-30-2007, 12:22 PM
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A little warmer today the truck runs and the SES lite is intermittent.
What I notice now is when the lope begins it is often accompanied by white grey smoke.
Looks like rich condition.
When not loping there is no smoke.

Unsure if this is related or not but the Volt gauge tells me 10ishV running and then it jumps up to 13ish mid scale.
A couple times I noticed that when the Volts jump on gauge to 13 that the engine begins to lope.

I was able to drive it 20 miles today however I had to restart it as many times.
I also had one cover off and the inside is very clean.
No sludge buildup, no scale no paraffin wax like goo.
Wires and terminals seem adequate.

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Old 01-02-2008, 09:45 AM
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Well here it is a new year and still my truck is NFG.
Today I dropped it off up at a repair shop versed in Powerstroke engines.
What they tell me so far is that the lite will not stay on to get codes PLUS he says the computer is not communicating with the scanner.
Any idears what my problem is now?
They say its "A" injector but also that the computer is not communicating.
Can I run 97 upgraded injectors in my 95?
Any thoughts?
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Old 01-23-2008, 03:20 PM
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going yet?

I just started having a similar issue and wanted to know if you got your ride going yet or have any leads as to what the problem is yet? I was thinking maybe a bad glow plug, injector, relay or something? Hoping it is not a bad valve or something like that?

B
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  #10  
Old 01-23-2008, 08:25 PM
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Quote:
Originally Posted by CentralOregon View Post
I just started having a similar issue and wanted to know if you got your ride going yet or have any leads as to what the problem is yet? I was thinking maybe a bad glow plug, injector, relay or something? Hoping it is not a bad valve or something like that?

B
Yes I finally did get it fixed.
And I know a LOT more about diesel engines.
At some point I felt my issue was on passenger side bank.
I took the cover off and found nothing abnormal.
Ran out of time working in the wind and rain etc was told I needed codes pulled when in reality I would have done better to pull the drivers cover as thats where the issue was.
Quite noticeably the wires thru the cover gasket were were burnt up and that was giving me injector failure on #6.
Apparently once the truck would talk with the code puller it said #6.
So let me see if I can save you several hundred dollars.
Inspect the areas where the wires go thru the covers.
Mine failed over a period of time so you might see early stages of burning wire harness at gasket.
I was pretty sure it was going to cost me and it did.
$3K for the E4OD and $1K for the wires and computer talk.
But I am a lot wiser now and say have a look at yours.
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