P0016 datalog assistence

[blackfireball5]

Hey all,

I was wondering if you guys could help me out.

A while back I saw a thread posted about the P0016/P0017 CEL and it being potentially caused by a mechanical failure in the intake cam actuators.

http://www.ft86club.com/forums/showthread.php?t=67821

I have the classic issues of car stalling on deceleration occasionally, rough idle at times, and rpm dips too low after I blip the throttle or push the clutch in. I also had the P0016 code. I had my tuner remove it from my map and am just now getting around to figuring this out.

I recently created a log of my symptoms and I was hoping someone could take a second to take a look at it and tell me if my vvt intake angles look laggy or normal. To me, it doesn't seem like there is anything wrong with either intake angle. But I may be missing something.

In my log, I was stationary and simply blipped the throttle 5-6 times. You can see in the log that my RPM's dip very low after each blip. Also, my STFT goes far into the negative at the same time the rpm dip happens. You can also see the afr gets very rich when the RPM dip happens.

The previous owner posted about potentially replacing the bank 1 intake cam actuator (even posted a picture of the new part) but I am unable to tell if he actually followed through with installing it.

It very well could be the ECU itself has burned in the incorrect parameters, and I no longer have a hardware failure. Or, there is still a mechanical failure. Or it could be something else entirely.

http://www.datazap.me/u/blackfirebal...0&data=6-10-29

Thank you guys for your time.


EDIT:

I went ahead and zoomed in on a part of the log that I believe is really telling of some kind of problem.

There are 4 lime green markers marking the rpm dips that happen shortly after I blip the throttle.

http://www.datazap.me/u/blackfirebal...97-331-358-426

The actual afr is all over the place compared to the target afr.

[Icecreamtruk]

Originally Posted by blackfireball5

Hey all,

I was wondering if you guys could help me out.

A while back I saw a thread posted about the P0016/P0017 CEL and it being potentially caused by a mechanical failure in the intake cam actuators.

http://www.ft86club.com/forums/showthread.php?t=67821

I have the classic issues of car stalling on deceleration occasionally, rough idle at times, and rpm dips too low after I blip the throttle or push the clutch in. I also had the P0016 code. I had my tuner remove it from my map and am just now getting around to figuring this out.

I recently created a log of my symptoms and I was hoping someone could take a second to take a look at it and tell me if my vvt intake angles look laggy or normal. To me, it doesn't seem like there is anything wrong with either intake angle. But I may be missing something.

In my log, I was stationary and simply blipped the throttle 5-6 times. You can see in the log that my RPM's dip very low after each blip. Also, my STFT goes far into the negative at the same time the rpm dip happens. You can also see the afr gets very rich when the RPM dip happens.

The previous owner posted about potentially replacing the bank 1 intake cam actuator (even posted a picture of the new part) but I am unable to tell if he actually followed through with installing it.

It very well could be the ECU itself has burned in the incorrect parameters, and I no longer have a hardware failure. Or, there is still a mechanical failure. Or it could be something else entirely.

http://www.datazap.me/u/blackfirebal...0&data=6-10-29

Thank you guys for your time.

Im having this exact same issue, minus the stalling since yesterday. I will go to check with my tuner on monday, most likely to disable the code first and see how the car runs afterwards. I will tell him to look at your logs, and to look at my data as well, to see if we can figure something out. Tag me on monday night if I havent come back for an update.

[blackfireball5]

Originally Posted by Icecreamtruk

Im having this exact same issue, minus the stalling since yesterday. I will go to check with my tuner on monday, most likely to disable the code first and see how the car runs afterwards. I will tell him to look at your logs, and to look at my data as well, to see if we can figure something out. Tag me on monday night if I havent come back for an update.

Thank you so much! I'll definitely do that.

Goodluck with your issue.

[blackfireball5]

@Icecreamtruk I edited my original post with a highlighted section of the log that I think shows the symptoms of the problem a little better.

[steve99]

Your long term fuel trim is over -20% at low rpm, looks like you have a fueling problem

Caused by
Aftermarket intake
Bad maf scaling
Dirty or faulty maf
Intake or exhaust leaks
Faulty fuel injectors

[blackfireball5]

Originally Posted by steve99

Your long term fuel trim is over -20% at low rpm, looks like you have a fueling problem

Caused by
Aftermarket intake
Bad maf scaling
Dirty or faulty maf
Intake or exhaust leaks
Faulty fuel injectors

Interesting.

I appreciate your response very much.

It's worth mentioning that I am boosted.

You believe this is a completely unrelated issue then to the P0016 code that I had removed from my tune? Also, do my intake cam angles look normal to you?

The car drives just fine and builds boost normally anything above idle/decelerating.

[steve99]

Originally Posted by blackfireball5

Interesting.

I appreciate your response very much.

It's worth mentioning that I am boosted.

You believe this is a completely unrelated issue then to the P0016 code that I had removed from my tune? Also, do my intake cam angles look normal to you?

The car drives just fine and builds boost normally anything above idle/decelerating.

Haha yeah boosted makes a difference

Check your bov if its downstream of the maf sensor, few guys have had leaky bov so the maf is metering the air, then some leaks out of bov at idle, ecu fuels for total volume of air then has to remove a lot of fuel via negitive ltft as air has leaked out of bov. Thst can cause symptoms your seeing

Also check the gasket at maf sensor sometimes boosted guys get leak their as well or any inrakes leaks post maf

[blackfireball5]

Originally Posted by steve99

Haha yeah boosted makes a difference

Check your bov if its downstream of the maf sensor, few guys have had leaky bov so the maf is metering the air, then some leaks out of bov at idle, ecu fuels for total volume of air then has to remove a lot of fuel via negitive ltft as air has leaked out of bov. Thst can cause symptoms your seeing

Also check the gasket at maf sensor sometimes boosted guys get leak their as well or any inrakes leaks post maf

Sounds good! I will do that!

[blackfireball5]

I took a visual look over my BOV and piping, as well as any visible vacuum lines.

Nothing looks to be a problem, but I might have to perform a leak test.

[blackfireball5]

I made a thing today. lol.

[Icecreamtruk]

Update even tho your problem seems unrelated. Took the car to the tuner, he initially logged with a "standard" ECU reading tool, and everything seemed and looked fine, logs very similar to yours. So he erased them, went for a drive, and the code came back up. So he then pulled the laptop and started logging other things with Ecutek only to find out that even tho the ECU reports the cam angles to be more or less ok, they werent actually working at all. All cam sensors were reading 0 volts at all times. So he then went on a hunch and replaced the sensor on the right side, and boom, magically it works. Code doesnt come back, car has gained some power that probably lost over time as I didnt notice a power loss, but certainly noticed a power gain after it was fixed.

The whole "once the P0016 comes up the ECU seems to be done, even if you replace the parts it keeps coming" thing that I seem to read in several threads here is more than likely that the ECU was faulty but not all ECUs are at fault when this code comes up, at least mine wasnt.

[blackfireball5]

Interesting. How did your tuner log the voltage to the sensors? Is that a parameter in Ecutek or did he manually check them with a volt meter?

Which cam did he end up replacing then? You said the right, but was that the passenger side top (intake bank 1 (that relates to the P0016))?

Thanks for looking into that and remembering to post back here. There's a small chance I could have more than one things going on. First and foremost I have to figure out my fueling issue. Just need to find the time to test for boost leaks.

[Icecreamtruk]

He checked with a voltmeter for the electrical connection, which was fine. He then checked with Ecutek for something he wasnt logging before (techstream or some similar software he was using). With ecutek he was able to see the sensors all reading 0. It was indeed passenger side, I meant right as in, right when standing in front of the car and looking at it, so passenger side.

[Packofcrows]

get maf cleaner and clean it. Start with cheap fixes.