Gas Pedal Delay

DIGItonium · 10-19-2010, 11:33 PM

Ooops... sorry I had to correct my post. He says it feels like the engine is running lean and holding back power. He asked about my aftermarket exhaust and losing back pressure, and I told him that there were owners with stock exhaust with the same issue. I also assured him that the cats are stock. It doesn't make sense because the car runs fine for the first several miles before acting up, so it can't be the exhaust.

As another member suggested, I'm wondering about fuel delivery.

So Thursday with maybe a scan gauge of some sort.

IcedZ · 10-19-2010, 11:34 PM

Makes more sense, I kinda figured that's what you meant.
Also, I'm going to try another experiment this weekend. I don't know that it's necessarily temperature related (but partially?), but just seems that way. Maybe it's mostly time related. Today I experienced the same issue at sub 200º oil temp. I was going to try to warm my car up only by idling and see if the "quick" / "slow" test will replicate by idling for 30 or so mins. That way oil temps will be minimal. I don't know much about this... but maybe it has to do with the fuel tables that the ECU creates. I believe those are filled, used, and updated dynamically. Maybe that doesn't make much sense either... dunno. Keep us updated though!

IcedZ · 10-20-2010, 09:23 AM

First, I apologize for my rambling...
As I was driving in this morning, I drove a little hard to get oil temps up to 200+ (not quite 220 like I wanted). Usually after this much time, and even at 200º, I would normally experience the problem at least a little bit. But I wasn't. My newest idea has to do with air density / MAF sensors. In the mornings (or at night), the air is cooler and more dense. In the middle of the day, the air is much less dense. So either the MAF sensors are giving erroneous data to the ECU, or the ECU algorithm is messed up (I find this unlikely, since the problem would be seen MUCH more often). This would directly affect fuel ratio being delivered to the system.
Just my 2 cents.

10-19-2010, 11:33 PM	#1 (permalink)
DIGItonium A True Z Fanatic Join Date: Jan 2009 Location: Kansas Posts: 3,800 Drives: 09 Z34-TT 6MT Rep Power: 43	Ooops... sorry I had to correct my post. He says it feels like the engine is running lean and holding back power. He asked about my aftermarket exhaust and losing back pressure, and I told him that there were owners with stock exhaust with the same issue. I also assured him that the cats are stock. It doesn't make sense because the car runs fine for the first several miles before acting up, so it can't be the exhaust. As another member suggested, I'm wondering about fuel delivery. So Thursday with maybe a scan gauge of some sort. __________________

10-19-2010, 11:34 PM	#2 (permalink)
IcedZ Base Member Join Date: Feb 2009 Location: Gainesville, FL Posts: 194 Drives: 09 370 Yellow, 6MT Rep Power: 17	Makes more sense, I kinda figured that's what you meant. Also, I'm going to try another experiment this weekend. I don't know that it's necessarily temperature related (but partially?), but just seems that way. Maybe it's mostly time related. Today I experienced the same issue at sub 200º oil temp. I was going to try to warm my car up only by idling and see if the "quick" / "slow" test will replicate by idling for 30 or so mins. That way oil temps will be minimal. I don't know much about this... but maybe it has to do with the fuel tables that the ECU creates. I believe those are filled, used, and updated dynamically. Maybe that doesn't make much sense either... dunno. Keep us updated though! Last edited by IcedZ; 10-19-2010 at 11:38 PM.

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10-20-2010, 09:23 AM	#3 (permalink)
IcedZ Base Member Join Date: Feb 2009 Location: Gainesville, FL Posts: 194 Drives: 09 370 Yellow, 6MT Rep Power: 17	First, I apologize for my rambling... As I was driving in this morning, I drove a little hard to get oil temps up to 200+ (not quite 220 like I wanted). Usually after this much time, and even at 200º, I would normally experience the problem at least a little bit. But I wasn't. My newest idea has to do with air density / MAF sensors. In the mornings (or at night), the air is cooler and more dense. In the middle of the day, the air is much less dense. So either the MAF sensors are giving erroneous data to the ECU, or the ECU algorithm is messed up (I find this unlikely, since the problem would be seen MUCH more often). This would directly affect fuel ratio being delivered to the system. Just my 2 cents.