Gas Pedal Delay

ninous26 · 05-15-2011, 11:23 AM

That video is really sad. However it looks more like the car is lazy when hot like its sucking in hot air with the AC running on full blast which results in lower power. I still see the delay though.

I hope Nissan is notified of this issue and they find a way to resolve it immediately. I say convert back to using the old throttle cable.

DIGItonium · 05-15-2011, 11:38 AM

That's right, it feels like A/C is running. Temps were in the low 70s when the videos were recorded.

Acceleration Problems. CPS, MAF Sensor? Tune Up? - Benzworld.org - Mercedes-Benz Discussion Forum
Mass Air Flow Sensor - My VW Lemon Bulletin Board
slow acceleration problem....o2 sensors? - Benzworld.org - Mercedes-Benz Discussion Forum
MAF sensor trouble & engine shudder during heavy acceleration at certain speeds [Archive] - bimmerfest - BMW Forums

So can I convince the dealer about MAF and/or O2 sensors being the possible culprits?

ChrisSlicks · 05-15-2011, 11:46 AM

Quote:

Originally Posted by DIGItonium

That's right, it feels like A/C is running. Temps were in the low 70s when the videos were recorded.

Acceleration Problems. CPS, MAF Sensor? Tune Up? - Benzworld.org - Mercedes-Benz Discussion Forum
Mass Air Flow Sensor - My VW Lemon Bulletin Board
slow acceleration problem....o2 sensors? - Benzworld.org - Mercedes-Benz Discussion Forum
MAF sensor trouble & engine shudder during heavy acceleration at certain speeds [Archive] - bimmerfest - BMW Forums

So can I convince the dealer about MAF and/or O2 sensors being the possible culprits?

They are certainly the most likely cuprits for screwing up your air/fuel ratio and causing the ECU to massively pull timing. They should do a test drive with data logging to see what the car is doing.

ninous26 · 05-15-2011, 11:53 AM

Digi I think you are coming onto something. I didn't fully read into those threads but have they come up with a solution?

spearfish25 · 05-15-2011, 12:34 PM

I'd like to see the results of a vented hood with accessory fans blowing air through the engine bay. I'd bet it would work wonders for the car.

IcedZ · 05-15-2011, 12:43 PM

Quote:

Originally Posted by GZ3

this solved my issue!

Mine too! Gave myself whiplash today!

IcedZ · 05-15-2011, 12:44 PM

Quote:

Originally Posted by gaveup

But is that the case for everyone else?

Everything else I have seen has pointed towards the oil heating issue.

It's not oil. I had the problem at ~180F oil in winter.

IcedZ · 05-15-2011, 12:46 PM

Quote:

Originally Posted by Econ

extend your posts per page setting and itll only be 17 pages.

hehe

umm basically just down shift then accelerate and there is no delay. The only time i notice a delay is in Auto mode on my 7at. if im in manual, i downshift to hit like 4500 rpm's and im out of there.

Also, I haven't read most of this thread so yea.

I think this it he first post I've read of an AUTO feeling it.

IcedZ · 05-15-2011, 12:51 PM

Quote:

Originally Posted by DIGItonium

Let me repost the YouTube video below to show the difference in power with a "cool" and a "hot" engine. Normally this car has plenty of power to move, and it can break loose my 285 Hankooks from roll! After 15-30 minutes of driving in warm weather, I start bogging the gears like a newb as if I'm not giving enough gas to get the car moving. You can see in the video how long it takes to get the car moving in 1st and 2nd from a roll. Pitiful.

I posted the same thing after DIGI did it (though I don't do the moving tests)

IcedZ · 05-15-2011, 12:59 PM

Sorry about the post bombing, guys. I also want to reiterate that I had a bad catalytic converter. They SUPPOSEDLY tested the whole exhaust system (O2 sensors, cat, and all). They said the problem was the cat. They fixed that under warranty @40k miles. Then I traded it in that week because the problem was as bad as ever. I was very hopeful off the lot, it felt amazing. But alas it came back.

DIGItonium · 05-15-2011, 01:05 PM

did they check the maf sensors though?

IcedZ · 05-15-2011, 01:22 PM

Quote:

Originally Posted by DIGItonium

did they check the maf sensors though?

Didn't ask, and I don't see it mentioned, so likely not. They probably don't consider that part of the exhaust system.

DIGItonium · 05-15-2011, 02:59 PM

I got another suggestion from someone in regards to troubleshooting MAF problems, and based on the issues I described he also thinks it's the MAF sensors. To isolate this problem, he suggested unplugging the MAF sensors and drive the car for a day to see if there is any consistency.

I'm not exactly sure about how our cars behave with the MAF sensors disconnected. My car is still down (no headlights) so I am not able to take the car to service to get it checked.

If you still have your car, do you think you can have them check or replace the MAF sensors under warranty?

IcedZ · 05-15-2011, 03:11 PM

Quote:

Originally Posted by DIGItonium

I got another suggestion from someone in regards to troubleshooting MAF problems, and based on the issues I described he also thinks it's the MAF sensors. To isolate this problem, he suggested unplugging the MAF sensors and drive the car for a day to see if there is any consistency.

I'm not exactly sure about how our cars behave with the MAF sensors disconnected. My car is still down (no headlights) so I am not able to take the car to service to get it checked.

If you still have your car, do you think you can have them check or replace the MAF sensors under warranty?

car = gone. I did try in the past. Car won't run without them. It idles TERRIBLY and dies when you hit the gas. I also ran the car with my OBD scanner plugged into my laptop, and they looked OK to me. But I'm also not really certified to tell these things =) Data looked consistent with what I'd expect though.. matched up with RPM's / speed.

DIGItonium · 05-15-2011, 03:43 PM

no problem... thanks for your efforts! I'm nervous about these problems affecting forced induction... wouldn't want ecu to trim fuel under boost.

I'm trying to research whether heat soak on MAF sensors is a type of failure.

05-15-2011, 11:38 AM	#617 (permalink)
DIGItonium A True Z Fanatic Join Date: Jan 2009 Location: Kansas Posts: 3,800 Drives: 09 Z34-TT 6MT Rep Power: 43	That's right, it feels like A/C is running. Temps were in the low 70s when the videos were recorded. Acceleration Problems. CPS, MAF Sensor? Tune Up? - Benzworld.org - Mercedes-Benz Discussion Forum Mass Air Flow Sensor - My VW Lemon Bulletin Board slow acceleration problem....o2 sensors? - Benzworld.org - Mercedes-Benz Discussion Forum MAF sensor trouble & engine shudder during heavy acceleration at certain speeds [Archive] - bimmerfest - BMW Forums So can I convince the dealer about MAF and/or O2 sensors being the possible culprits? __________________

05-15-2011, 12:34 PM	#620 (permalink)
spearfish25 A True Z Fanatic Join Date: Mar 2009 Location: Naples, FL Posts: 4,117 Drives: to work Rep Power: 1857	I'd like to see the results of a vented hood with accessory fans blowing air through the engine bay. I'd bet it would work wonders for the car. __________________ 2013 Cadillac V-Wagon, RIP Z

05-15-2011, 01:05 PM	#626 (permalink)
DIGItonium A True Z Fanatic Join Date: Jan 2009 Location: Kansas Posts: 3,800 Drives: 09 Z34-TT 6MT Rep Power: 43	did they check the maf sensors though? __________________

05-15-2011, 02:59 PM	#628 (permalink)
DIGItonium A True Z Fanatic Join Date: Jan 2009 Location: Kansas Posts: 3,800 Drives: 09 Z34-TT 6MT Rep Power: 43	I got another suggestion from someone in regards to troubleshooting MAF problems, and based on the issues I described he also thinks it's the MAF sensors. To isolate this problem, he suggested unplugging the MAF sensors and drive the car for a day to see if there is any consistency. I'm not exactly sure about how our cars behave with the MAF sensors disconnected. My car is still down (no headlights) so I am not able to take the car to service to get it checked. If you still have your car, do you think you can have them check or replace the MAF sensors under warranty? __________________

05-15-2011, 03:43 PM	#630 (permalink)
DIGItonium A True Z Fanatic Join Date: Jan 2009 Location: Kansas Posts: 3,800 Drives: 09 Z34-TT 6MT Rep Power: 43	no problem... thanks for your efforts! I'm nervous about these problems affecting forced induction... wouldn't want ecu to trim fuel under boost. I'm trying to research whether heat soak on MAF sensors is a type of failure. __________________

05-15-2011, 11:23 AM	#616 (permalink)
ninous26 Base Member Join Date: Sep 2009 Location: Phoenix AZ Posts: 112 Drives: 03 G35 black 5AT Rep Power: 16	That video is really sad. However it looks more like the car is lazy when hot like its sucking in hot air with the AC running on full blast which results in lower power. I still see the delay though. I hope Nissan is notified of this issue and they find a way to resolve it immediately. I say convert back to using the old throttle cable.

05-15-2011, 11:53 AM	#619 (permalink)
ninous26 Base Member Join Date: Sep 2009 Location: Phoenix AZ Posts: 112 Drives: 03 G35 black 5AT Rep Power: 16	Digi I think you are coming onto something. I didn't fully read into those threads but have they come up with a solution?

05-15-2011, 12:59 PM	#625 (permalink)
IcedZ Base Member Join Date: Feb 2009 Location: Gainesville, FL Posts: 194 Drives: 09 370 Yellow, 6MT Rep Power: 17	Sorry about the post bombing, guys. I also want to reiterate that I had a bad catalytic converter. They SUPPOSEDLY tested the whole exhaust system (O2 sensors, cat, and all). They said the problem was the cat. They fixed that under warranty @40k miles. Then I traded it in that week because the problem was as bad as ever. I was very hopeful off the lot, it felt amazing. But alas it came back.

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