Dies when you floor it on highway ?

[1965LONEWOLF]

Dies on hightway when you floor it. Just started doing it , changed the fuel filter , fass pump seams to be working , rail presuusre seams normal , if you get on a side road and your doing 20 - 30 mph , no problems when you floor it , when yout highway doing 70 mph and floor it , it attepts to start and then cuts out and feels like lack of fuel . let off the pedal and you can cruise no problem at 65 - 70 but you try to floor it , forget it - doesn't want to hear it- scraching my head to figure this one out ? ANY IDEA'S ???

 

[JCockerill]

any obd2 codes? check air filter?

 

[1965LONEWOLF]

Already checked both , no codes and air filter is clean and good. .

 

[Wingate]

seems like I heard of this awhile back... . Seems like it was a wastegate issue... but my memory isn't as good as it used to be.

 

[JaredH]

May want to check the wire insulation on the wastegate actuator. I think I remember some people had problems with the wires rubbing the insulation off...

 

[MQuirin]

Under the scenario you describe - good FP and RP - at WOT you should get heavy black smoke if you have a turbo/waste gate problem. Is this the case?

 

[1965LONEWOLF]

No , blue smoke - and i let right off , then you continue at 65 - 70 mph and no problem , tried to get on it , it trys for about a minute and then power shuts off and no go , 1/2 second you can continue to cruise again ?

 

[MQuirin]

What are your RP and FP when the "power shuts off?"

 

[1965LONEWOLF]

Took truck and worst then yesturday , on the quad rail gauge i have it reads 700-800 when idle,start to drive and it'll come up to around 2100 -2200 and give it alittle throttle and she'll drop to 200 , rolled down window and couldn't hear my fass running, got home and pump sounds week , only have 72,830 on the truck , pump is i think 3-4 years old, when truck is off and key is on, the pump sound ok, start thr truck and it sound week...

 

[WoodChuck]

Could be APPS.

 

[seafish]

What about checking all the electrical connections and ground(s) at the Fass pump and also where it hooks up to the factory harness or fuse panel??

Unplug 'em, clean em, check for tightness of the pins, maybe use some dielectric grease on 'em, then put em back together and see what happens. Just an idea.

A bad connection, obviously, can wreak havoc

 

[steved]

Although I had a lot more miles, my FASS died just last month... if it is a newer FASS, it should pass fuel and (in my case) not affect the way the truck runs.



I found the relay terminals corroded at one point, then the fuse... it sounded weak for a while. It finally started blowing fuses. All the connections (the weather-tight ones) seemed fine when I pull them... it was the ones under the hood that were not weather tight that cause my problems.



I would really scrutinize the FASS, if you feel its not normal; then it might be your problem.

 

[MQuirin]

Took truck and worst then yesturday , on the quad rail gauge i have it reads 700-800 when idle,start to drive and it'll come up to around 2100 -2200 and give it alittle throttle and she'll drop to 200 , rolled down window and couldn't hear my fass running, got home and pump sounds week , only have 72,830 on the truck , pump is i think 3-4 years old, when truck is off and key is on, the pump sound ok, start thr truck and it sound week...

Those numbers can't be correct. It won't idle at 800 psi. Do you mean 7000 at idle, and 21k-22k on acceleration? What is your FP?

 

[steved]

Those numbers can't be correct. It won't idle at 800 psi. Do you mean 7000 at idle, and 21k-22k on acceleration? What is your FP?

I want to remember that particular gauge is a X10, so your assumption would be correct if it is x10...

 

[1965LONEWOLF]

well i took pump off today,took it apart and cleaned it and put it all back together and run on the bench fine - going to test it tomorrow with two gallons buckets and put a psi gauge on it , WHAT SHOULD THE PSI BE ?

 

[1965LONEWOLF]

Well i checked for code on the odometer and this is what it reads:



C - code

64 85

a4 31

ac 69



don't what any of this means - but i'm hoping someone does on here.

 

[1965LONEWOLF]

well i tested the fass today in middle of a blizzard laying in the snow - free flowing she'll pump 180 gallons a hour ,

at 17 psi its 32 gallons a hour , about 1/2 gallon a minute , runs fine in my book , for the hell of it i took off the small pre-filter ( i changed it 4 weeks ago ) and i couldn't blow threw it , put another one on and she runs perfect , even under hard runs thr psi never dropped below 12 - so buy doing one thing at a time and taking your time , you don't have to throw alot of money at a problem to fix it ... . thanks for all who hepled out with your thoughts