Hesitation and high KR Cold weather issues?

Exactly right, Rich, though I don't have a way to justify it yet.  If FRP is being commanded, why is it not being delivered?  Is it a logic problem, a voltage problem, or a mechanical problem?  Puzzling.
 
SHOdded said:
Exactly right, Rich, though I don't have a way to justify it yet.  If FRP is being commanded, why is it not being delivered?  Is it as logic problem, a voltage problem, or a mechanical problem?  Puzzling.
Click to expand...

I guess I can try against stock again and go from there. I was assuming it was tune + 94 winter gas.


Sent from my iPhone using Tapatalk
 
SHOdded said:
Exactly right, Rich, though I don't have a way to justify it yet.  If FRP is being commanded, why is it not being delivered?  Is it a logic problem, a voltage problem, or a mechanical problem?  Puzzling.
Click to expand...

What is the known 55 mph issue?


Sent from my iPhone using Tapatalk
 
Think Manu was referencing your post about it being at 55 mph.

BigMac had a fuel delivery issue stemming from the tank pump that would sporadically pop up.

Rich

 
ShoBoat said:
What is the known 55 mph issue?


Sent from my iPhone using Tapatalk
Click to expand...
No known issue, I was referring to the conditions under which you are seeing the problems in your latest test :)
 
Ok a quick (chappy lol) chart of the HP VS the LP fuel delivery on the failed run. To me the LP side looks ok, it drops slightly to 98 PSI from the commanded 102 PSI and on the successful (no hesitation roll from 30 mph) the same LPF is pretty solid dropping slightly to 98 also. 
I going to try a stock run to see if the FRP drops from a 55mph roll.
 
SHOnUup said:
Think Manu was referencing your post about it being at 55 mph.

BigMac had a fuel delivery issue stemming from the tank pump that would sporadically pop up.

Rich
Click to expand...
Yea... Had a comm code about fuel delivery module communication with PCM and DTC with CEL for low fuel rail pressure... On the way to the dealer She died.... The low pressure fuel pump had failed and replacement didn't fix it... They died at a stoplight in the test drive... So the fuel control module was replaced and no problems since.  BTW... The car actually runs better than ever... I believe function on these components can decline significantly before setting a DTC.  Mine happened at initial startup and for a while the car went into  limp mode. The problem I had was never a high speed (above 30 mph) thing.
So consider the FCM as well as the fuel pumps... And communication.
 
Curious if your throttle plate is closing when you lose fuel pressure? I believe you can log it and it would be interesting to see what it is doing while you have it "floored".
 
ecoboostsho said:
Curious if your throttle plate is closing when you lose fuel pressure? I believe you can log it and it would be interesting to see what it is doing while you have it "floored".
Click to expand...
sometimes yes it closes briefly then it's wide open. Others it stays wide open during the issue. 


Sent from my iPhone using Tapatalk
 
Did you ever check for any exhaust leaks,an exhaust leak on the left bank will cause lean and rich conditions beyond what the PCM can control with fueling,the exhaust leak will make the engine run lean above idle speed and run rich at an idle on that bank.Z
 
ZSHO said:
Did you ever check for any exhaust leaks,an exhaust leak on the left bank will cause lean and rich conditions beyond what the PCM can control with fueling,the exhaust leak will make the engine run lean above idle speed and run rich at an idle on that bank.Z
Click to expand...

Yes I did, actually thats how I found out that the PTU was leaking. It's fine at idle. Bank 1 and 2 are perfectly in sync. I just came back from a data run on the stock tune and no issues at all. I will post the logs in a few min.
 
Ok this time we have the actual screen shots from Forscan, hopefully a bit easier to read. The interesting thing to look at is the throttle plate position in the stock and tuned runs. Then the 30 mph WOT run. I am a little confused on why from the 50 mph roll it falls flat on it's face. To me this looks like a tuning issue. Any thoughts? Also the 2nd 50MPH run it recovered??

FoMo Sorry I did not have the commanded AFR on the last set of runs. But when I did in the past it was really close to the commanded value.
 
You must log in or register to reply here.

Similar threads

C
my 2017 SHO w/PP
2 3 4
Replies
65
Views
28K
SHOdded
S
P
2016 Taurus Police Ecoboost problem
Replies
6
Views
3K
SHOdded
S
2
2013 SHO w/pp. Replaced timing chain and water pump. still have issues
Replies
2
Views
6K
SHOdded
S
S
Water pump, timing chain and unsolicited info
Replies
1
Views
9K
SHOme
S
T
Fuel injector coding
Replies
3
Views
11K
SHOdded
S
Back
Top