Fuel Pressure supposed to be

[boogs5150]

Trying to diagnose my cyl. 1 misfire and can't find exactly what the fuel pressure is supposed to be on these cars. 2010 SHO. Car doesn't misfire on stock calibration but does instantly at WOT on SCT 87 and Unleashed 87 2 bar tunes with 93 in the tank. Plugs are changed and gapped twice actually to elimate plugs from the issue. I know Torrie said the fuel pressure seemed a bit lower when I sent him a log to review than normal but I don't want to bug him with Tech support questions. I was just visually looking at the Fuel Pressure percentage and it was jumping from low teens all the way to 200% at idle so I found that odd but I have no idea what that means. I just don't want to throw parts at it and I think I should be able to figure it out with your guys help and a little x4 data logging so I am just looking for someones knowledge on what PIDS to log. Thanks a bunch!

 

[SHOdded]

Should be fine asking Torrie questions if you have data for him to parse. Why don't you post up the datalogs you do have, let us see directly what is happening? I know I like my data unfiltered Let us build a picture of what's going on with your SHO. If the files are too big for this forum, set up a free dropbox account, upload them there, and share the links.

 

[boogs5150]

Sweet thanks. Here is one I did yesterday, I can't remember at the time what I was doing with the car LOL
https://docs.google.com/spreadsheet...uIrfFSRGhu8jWTxhVdfd_kPuE/edit#gid=1336356449

 

[SHOdded]

won't let me access without a google signin. hope other members can.

 

[boogs5150]

I created a DropBox. Here is the link: https://www.dropbox.com/s/8cpfdc9h6kognl0/datalog1 4717.csv?dl=0
Thanks!

 

[Johnbigdog]

Fuel pressure is not going to chase a single cylinder misfire. Fuel pressure is going to be the same to all injectors and is constant in a sealed system. If fuel pressure was low all cylinders are going to be affected.

 

[Johnbigdog]

48 to 70 gauged. PID data will be up to 15 psi more

 

[StealBlueSho]

There is no WOT runs in that datalog... not sure what you are trying to show?

 

[boogs5150]

Apologies wrong log. Here is the 0-80 WOT Run w/ stock cal and 93 octane. I really appreciate all the support from everyone!!
https://www.dropbox.com/s/84ejw4kgeqp7l8y/WOT0to80mph.csv?dl=0

 

[StealBlueSho]

Is this a stock log? Torrie doesn't normally use the throttle to control load... this log the throttle is all over the place much like the stock mappings... (you wouldn't even notice that the throttle is controlling load... unless it takes a massive dive which it doesn't)..

Your fuel pressure looks great.. 2000+ PSI through the whole run... not a blip anywhere... your bank 1 STFT is not good... but your LTFT's are OK... and even on both banks...

I would be concerned with bank 1 needing an extra 10% of fuel through the whole run while bank 2 is pulling 5% less fuel to keep from running too rich.. kinda weird.. but I see it A LOT with torries tunes...

This log is funny.. it looks like the stock maps but it DOES appear to have some of Torries handy work...

 

[boogs5150]

Man you are good! This is the stock tune because the car will misfire during a WOT pull with Torries and with the SCT Strategy Tunes. Just seeing if anyone noticed anything crazy with my stock car. So is bank 1 the rear (firewall) cylinders? That would make sense if it is because I occasionally can get the flashing CEL to give me a cylinder 1 misfire code.

 

[boogs5150]

Thats why I was hoping when you said bank 1 needed more fuel that it was the firewall cylinders since that would make sense because every now and then I can get the flashing CEL to give me that cylinder 1 misfire code. Maybe cyl 1 injector can't handle the extra fuel required with a tune is my thoughts seeing how I changed 2 sets of spark plugs and moved coil packs around I can still get the same code.

 

[StealBlueSho]

So what code are you getting? I would be very concerned if I was running the stock tune and seeing that kinda STFT on ANY bank... so STFT is basically attempting to correct something that ECU was not expecting..

Are you having any other symptoms such as a stutter at idle or really crappy gas mileage?

 

[glockcoma]

Thats why I was hoping when you said bank 1 needed more fuel that it was the firewall cylinders since that would make sense because every now and then I can get the flashing CEL to give me that cylinder 1 misfire code. Maybe cyl 1 injector can't handle the extra fuel required with a tune is my thoughts seeing how I changed 2 sets of spark plugs and moved coil packs around I can still get the same code.

Maybe bad injector in cyl 1.
Flashing cel means the engine is shutting down to protect itself from kaboom.
I wouldn't go WOT until you get this fixed. If you run the tune file the next WOT might be the last.

 

[boogs5150]

P0301 was the code but it has only been throwing flashing CEL with SCT tune and Unleashed so its not liking the added fuel/boost. I even thought about closing the gap on cyl 1 to something much tighter than the .030 I am at now on all plugs. The last 3 days I have had the stock tune on and it has been great but I know with a tune it will be at "its best" and I am not satisfied with the stock tune knowing that everyone out there can successfully run a custom cal. Every car IMO can benefit from a custom calibration and mine is being stubborn for some reason. I don't have a stutter at idle and the gas mileage is OK. I have been abusing it a lot lately so its not great but cruising it seems fine MPG wise. I averaged 26 on the highway on a 30 mile highway trip so I know its doing pretty good. I am thinking I may just go ahead and have the cyl. 1 injector replaced and see what happens. If it doesn't fix it I will suck it up and deal with the stock cal. Its still pretty quick on it but the shifting....meh..

 

[boogs5150]

I imagine cylinder 1-2-3 would be bank 1 and from what you guys have told me it would seem that cyl 1 injector is behaving decent but not as good as cyl 2 and 3 at WOT and would hence explain the leaner condition out of that bank seeing how I get that cyl 1 misfire occasionally and from all the other issues I have read about it seems my injector is not sticking but not flowing up to par. I come from 05 and newer Mustangs and injectors are never an issue. Spark plugs...definitely.

 

[Johnbigdog]

Unless you have a power ground issue to the coil, your options are fuel injector or valve train problems with cylinder one. Our GTDI engines have injector faults unlike port injected.

You don't have a VCT issue because only one cylinder is affected. Valve train timing would affect all 3 cylimders.

Replace the one injector as its hard to measure vacuum under boost to monitor a sticking valve. I can't think of a way to check for sticking valve train components at WOT so really your down to a injector before going base engine.

Air Intake and exhaust problems would affect the bank of cylinders.

This game is all a process of elimination and what will affect what.

Sensor issues would affect the whole engine.

See where this is going?

 

[Johnbigdog]

For those that have ids. Misfires can be monitored with cyl-x-acl PID data

 

[StealBlueSho]

Here is a zip with a more comprehensive datalog file... it also has the misfire PID data... load it up and use it to datalog if you are curious... flashing CEL is no bueno though...

 

[boogs5150]

You guys have been more than great! I just loaded the config file onto my X4 and will test it out tomorrow with the less aggressive SCT 87 strategy tune that will misfire for sure haha and upload the log to see what you think. Its's misfired and threw the flashing light at least a dozen times in the month that I have had it tuned and untuned and when it does I immediately get out of the throttle and coast for 30 sec. It even knocks occasionally then throws the light.