2000 7.3 Excursion will not go past 20 when it is cold out.Unless it has warmed up for atleast 10-12 minutes,even with the pedal to the floor ,maybe will hit 21 after about a 1/4 of a mile.I have changed the fuel filter,I have changed the oil/filter,and I have changed the EBP sensor and cleaned the tube going to it.I still have the same issue.
Any advice would be Great !
Thanks,
Richard

 

is it stock or does it have a chip or tuner

 

It is all stock.

 

are you flooring the throttle and it just doesnt seem to accelerate ??? Everything on the 7.3 is dependant on the Oil Engine Temp. Possible you have a bad sender that is telling the engine its Ice cold till it reaches a certain temp and the sensor starts working properly.... If you have a scantool like Autoengunity that can display all your sensor live data you could look and see what the sensor readings are... I bet a forum member somewhere near you has something that will do that....

 

When its well below freezing, my Ex will do this - but not for long, maybe 2-3 minutes. It slowly has more power, but I never drive 'normal' until full operating temp anyway... Anyway, it is possible you have an EOT sensor issue or even a failed t-stat that is increasing warm-up times. It would be interesting to use AE or similar to 'see' a few more parameters while this is happening to your rig.

It is interesting this 'feature' does not work with any of the tunes on my chip. Since discovering this, now I ALWAYS start truck in 'stock' and only switch if/when I want mo power. FWIW, both my PSD's will have EOT gauges very soon!

 

There are also screens on the pickup tube in the tank that may be getting clogged. Since they are in the mixing chamber maybe once the fuel get warms it mixes with the cold fuel in the tank and loosens it all up until the next time. Just a thought.

I know mine were caked in junk, looked black when I pulled them out and cleaned them.

 

What made You change the filter in the tank?Did You have an issue going on of something.I know dropping a tank can be a pain.But if I knew for sure,I would change.
Thanks,
Richard

 

Trying to learn,so I have a ? What is an EOT sensor and where is it located?What is a t-stat and where is it located? I'm a do it Myself to save $ and not throw it away if I can do it Myself.Would that be a thermostat Your talking about ?

 

EOT = Engine Operating Temperature sensor and I don't know exactly where it is so you need to look in your manual.

t-stat = Thermostat. That's usually at the junction of the upper hose to the intake manifiold. Again, it's in your manual.

BTW, you really shouldn't be flogging a diesel when it's ice cold. Diesels work off pressure and temperature. You can do a LOT of damage hitting it hard before it comes up to temp. Save that for the Soccer Mom mobile.

 

Yes may move ,but turtle speed.I traded My 1995 F350 7.3 for this Excursion and My truck never ran like this at all.Just the waste gate would open diffrently when cold,so it made a hissing noise.The things I have changed is because of dealer or web sites giving opions.Oil was because maybe the guy before Me put the wrong kind of 15W40 as in tractor oil,was told that would foam up and take longer to warm up.Did not help.I live in Chillicothe,Ohio and will pay someone if You have this Autoengunity.

 

Have never done this when ice cold , just around 8 or 9 minutes after warming up and slowly push to floor.Would only do that with My Yamaha 700 Grizzly after warmed up.Thanks for advice.That was funny ! Makes Me think of when I was at Wal Mart getting oil and I heard some women telling someone on Her cell phone She needs to buy some oil,because Her oil light came on in Her car.TO FUNNY !!NO manual.Maybe I will change t-stat.I changed that on the F350 that I traded for the Excursion.

 

Ok, I do not think it is a fuel problem - directly. The LAST thing I would do is drop the tank for this issue. Next to last would be throwing parts at it. Dropping the tank and doing the 'in-tank' and 'pre-pump mods' (do a search and/or read the 'common mods' sticky in the 7.3 section ) is a great idea and so is upgrading the t-stat to a 203* unit from dieselsite.com (get the billet housing too!) - BUT, ya may still need to spend $$ later to fix your problem.

I said t-stat because the engine oil is heated (and cooled - confused yet??) by the coolant and a failed t-stat can allow unobstructed flow to the radiator, so you'd be trying to warm all (8) gals of coolant instead of the couple gals or less in the block. In my trucks (w/203* t-stats), the coolant temp gauge in dash hits 'normal' range in about 2 miles driving easy in this 35-40* AM weather and is near the center of normal in well under 10 miles. Anyway, the computer uses EOT to determine many parameters including timing, and a 'cold' engine MAY perform the way you describe.

I think you can find a copy of the manuals for your truck somewhere on this site, maybe the sticky in 7.3 section?

As soon as I get a minute, I'll go get another memory card for my anemic 'lil laptop so I can actually use the AWESOME Ford tech manual I finally installed. When I do, I'll look up your symptoms and post if someone doesn't beat me to it! (feel free!)

I wish I had bought the Autoenginuity years ago. BEST $339 I ever spent on my PSD's (thanks again Clay - Riffraff diesel!!!!) You only have to pay the stealership a couple times for 'diagnosis' to justify this expense, and with an AE and all yer helpful friends here at FTE - you NEVER have to go to the stealer again. IMO, there is very little you cannot DIY on your truck!!!

Meanwhile, maybe post in 7.3 section (more traffic down there!) and ask if there's anyone near you w/an AE. If I wuz closer, I'd hook you up in a heartbeat!!

Just to clarify... truck starts fine and appears to run fine after it does 'warm up', right? Btw, DA BUS is possibly misunderstanding 'flooring it' - the computer is limiting power, so flooring it is the equivalent of barely pressing the throttle - what he is reffering to is 'drive easy' until warm, no popping wheelies and laying rubber!! 'Warm' is actually EOT on these engines - I will have EOT gauges in both my trucks SOON, since EOT can lag behind coolant temp quite a bit depending on conditions...

Keep us posted!!!!!!!!!

 

Not to hijack a thread or anything (because I think this might be related) but what am I replacing here? What is the OEM T-stat rated for? 190*? 220*???

 

195* or 192* This should answer all yer questions. http://www.dieselsite.com/index.asp?...ROD&ProdID=186
The stock housing is a POS and 'not reusable' according to Ford... Many rust out and leak! Bob's billet piece is nice and should last several lifetimes.

 

I just read the article. Thanks for the link. I had seen this mod mentioned in people's sig's but didn't understand why before.

I think I'm ordering up a stat and a billet housing right now.

This may positively affect Richard's issue right away.