Shudder on acceleration issue

[Flexthis2011EB]

Hmm, behaves like your Flex has 1 or more plugged cats.  Might be 1 is plugged, other not, causing uneven power delivery ...

That was my first thought after the condesation in CAC thing. So i hooked up my scanner and watched pids. Now im no pro at this and am very new but have gotten so far that the down stream o2s should not be flucuating but yet when i watch them they move constantly. Heres a video of my pids. https://youtu.be/GHwUDY6OZ3E

[AJP turbo]

I would recommend doing logs with a data logger such as livelink instead of that handheld......Not being a dick but I don't know how reliable that cen tech device is....It's probably the cheapest OBD can bus code reader on the market.

When you are looking at stft's and anything 02 related you need to  be really steady on the the gas and also give it time to stabilize....If you've ever tuned a car for part throttle and cruise you do step tests where you vary the throttle position and leave it for at least 5 seconds at each step. Otherwise the trims never have time to settle....The readings you are looking at will ALWAYS occilate....That's what 02 sensors do...That's why modern cars run really well and fuel economy is so much better.

I don't know why that one reading was blank but it wouldn't make sense anyway....I don't know what a STFT for a rear 02 sensor would even be.....That's not something it adjusts. It will read lambda for the cat monitor but not make any adjustments.

[Flexthis2011EB]

I would recommend doing logs with a data logger such as livelink instead of that handheld......Not being a dick but I don't know how reliable that cen tech device is....It's probably the cheapest OBD can bus code reader on the market.

When you are looking at stft's and anything 02 related you need to  be really steady on the the gas and also give it time to stabilize....If you've ever tuned a car for part throttle and cruise you do step tests where you vary the throttle position and leave it for at least 5 seconds at each step. Otherwise the trims never have time to settle....The readings you are looking at will ALWAYS occilate....That's what 02 sensors do...That's why modern cars run really well and fuel economy is so much better.

I don't know why that one reading was blank but it wouldn't make sense anyway....I don't know what a STFT for a rear 02 sensor would even be.....That's not something it adjusts. It will read lambda for the cat monitor but not make any adjustments.

Hmmm. Well car goes to shop tomorrow,  hopefully i can get sone light at the end of this dark tunnel. Ill be sure to post what they found. Thank u everyone for all ur input!

[66 Galaxie]

Based on your video while driving I don't see any rpm fluctuations which in my experience go along with a bad torque converter.

I wonder if you have a fuel issue like a failing fuel pump or dirt in the tank that occasionally blocks fuel flow for the lpfp in the tank.  Maybe a bad connection on one of your injectors or?

There have also been some strange failing coil packs that have not triggered any codes or engine light.

I hope the shop finds it quickly and it is an easy fix.

[Flexthis2011EB]

Based on your video while driving I don't see any rpm fluctuations which in my experience go along with a bad torque converter.

I wonder if you have a fuel issue like a failing fuel pump or dirt in the tank that occasionally blocks fuel flow for the lpfp in the tank.  Maybe a bad connection on one of your injectors or?

There have also been some strange failing coil packs that have not triggered any codes or engine light.

I hope the shop finds it quickly and it is an easy fix.

I hope they figure it out too. Your thoughts are very good though.  All possibilities. I will be sure to post the findings. Fingers crossed.

[Flexthis2011EB]

So the final verdict is (according to Ford) is the left cat is bad (im assuming "left" as in bank 2 which would make sense since i have a p0430 cat eff below thresh bank 2) along with a p0299 low boost code. Which i guess could also coillide with the shuddering as some explained a faulty wastegate could cause that. So i guess i will try to find a cheap cat and replace it myself byt as far as the p0299, what would be the first things to look into? How can i check if the wastegate on these are functioning properly?

[SHOdded]

http://www.obd-codes.com/p0430 - Bank 2
http://www.obd-codes.com/p0299

[Flexthis2011EB]

http://www.obd-codes.com/p0430 - Bank 2
http://www.obd-codes.com/p0299

So for the under boost it says possible condition could be due to divertor valves which i did vent both. I wonder if thats the problem.

[glock-coma]

http://www.obd-codes.com/p0430 - Bank 2
http://www.obd-codes.com/p0299

So for the under boost it says possible condition could be due to divertor valves which i did vent both. I wonder if thats the problem.

Someone here had some seriously chewed up bov seals that were causing boost leaks. Probably worthwhile to check them out.
Only a couple bolts on each one


Edit: found it.
Here's the link.  "2 blown turbos " is the thread title.
http://www.ecoboostperformanceforum.com/index.php?topic=5936



Sent from my iPad using Tapatalk

[Flexthis2011EB]

http://www.obd-codes.com/p0430 - Bank 2
http://www.obd-codes.com/p0299

So for the under boost it says possible condition could be due to divertor valves which i did vent both. I wonder if thats the problem.

Someone here had some seriously chewed up bov seals that were causing boost leaks. Probably worthwhile to check them out.
Only a couple bolts on each one


Edit: found it.
Here's the link.  "2 blown turbos " is the thread title.
http://www.ecoboostperformanceforum.com/index.php?topic=5936



Sent from my iPad using Tapatalk

You know, i have removed them before. Maybe wouldn't be a bad idea just to change the seals quick.

[SHOdded]

Latest updates in this thread:
http://www.ecoboostperformanceforum.com/index.php/topic,6305.0