VQ35DE Pinging Dilemna
02-25-2007, 12:36 PM
#43
Donating Maxima.org Member
Join Date: Jan 2007
Posts: 311
Originally Posted by P. Samson
Don't confuse the Variable Intake Valve Timing with the VIAS.
02-25-2007, 01:10 PM
#44
Originally Posted by NmexMAX
The injen places the filter in a high temp area, therefore increasing the IAT's. 
VVT doesn't 'open' @ certain RPM's
VVT doesn't 'open' @ certain RPM's
But since you didn't want to add any extra information, I'll submit. VVT alters valve timing with RPM.
http://www.streetracersonline.com/ar...amshafts/3.php
Before we take a look at each of these variable valve-timing systems, let's rehash how valve timing normally works. Until recently, a manufacturer used one or more camshafts (plus some pushrods, lifters and rocker arms) to open and close an engine's valves. The camshaft/camshafts was turned by a timing chain that connected to the crankshaft. As engine rpm's rose and fell, the crankshaft and camshaft would turn faster or slower to keep valve timing relatively close to what was needed for engine operation.
...
Variable valve timing has changed all that. By coming up with a way to alter valve timing between high and low rpm's, Honda, Toyota and BMW and many more manufacturer's can now tune valve operation for optimum performance and efficiency throughout the entire rev range.
...
Variable valve timing has changed all that. By coming up with a way to alter valve timing between high and low rpm's, Honda, Toyota and BMW and many more manufacturer's can now tune valve operation for optimum performance and efficiency throughout the entire rev range.
02-25-2007, 05:11 PM
#45
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Join Date: Jan 2007
Posts: 311
Originally Posted by 2002 Maxima SE
VVT alters valve timing with RPM.
02-25-2007, 09:16 PM
#46
Supporting Maxima.org Member
Join Date: Apr 2005
Posts: 57
I've done everything you can think of to eliminate the pinging sound around 2k rpm. The only thing that helped was changing the spark plug to a 1 step cooler plug. I don't hear anything anymore, and I'm completely happy w/ the Max again.....
02-26-2007, 04:57 AM
#47
Originally Posted by csmoot
I've done everything you can think of to eliminate the pinging sound around 2k rpm. The only thing that helped was changing the spark plug to a 1 step cooler plug. I don't hear anything anymore, and I'm completely happy w/ the Max again.....
I would at least thought you would experience weaker acceleration.
02-26-2007, 08:33 AM
#48
Supporting Maxima.org Member
Join Date: Apr 2005
Posts: 57
Originally Posted by AllGo
Have you noticed any decreases in performance and or gas mileage?
I would at least thought you would experience weaker acceleration.
I would at least thought you would experience weaker acceleration.
Actually the car feels more responsive now more than ever. You have to understand that the knocking and pinging sound I was experiencing was predetonation and that was robbing my car of performance and hurting my gas mileage. Since I did the spark plug change my car is operating more effeciently therefore my mileage slightly went up......
02-26-2007, 02:29 PM
#50
Originally Posted by kenshi
Predetonation = knock. Meaning the air/fuel mixture explodes in the cylinder before it is supposed to, resulting in pressure on the piston on its upstroke instead of down-stroke. Depending on how early this happens in the piston's cycle will determine the amount of harm you are inflicting on piston, piston rings, and cylinder. It's something that you want to avoid at all costs.
02-26-2007, 02:32 PM
#51
Originally Posted by AllGo
Have you noticed any decreases in performance and or gas mileage?
I would at least thought you would experience weaker acceleration.
I would at least thought you would experience weaker acceleration.
02-26-2007, 05:27 PM
#52
Originally Posted by kenshi
Simply, predetonation or preignition is when the air/fuel mixture ignites before the spark plug fires. That's what causes pinging and/or knock. That's not supposed to happen.
1. "Predetonation" is not a correct and generally accept term.
2. Preignition and detonation/knock/ping are two VERY different things and as such are caused by different conditions. This thread concerns the latter.
3. What you described in your post is the former and kills engines VERY quickly.
Originally Posted by Article
Detonation is the spontaneous combustion of the end-gas (remaining fuel/air mixture) in the chamber. It always occurs after normal combustion is initiated by the spark plug. The initial combustion at the spark plug is followed by a normal combustion burn. For some reason, likely heat and pressure, the end gas in the chamber spontaneously combusts. The key point here is that detonation occurs after you have initiated the normal combustion with the spark plug.
Pre-ignition is defined as the ignition of the mixture prior to the spark plug firing. Anytime something causes the mixture in the chamber to ignite prior to the spark plug event it is classified as pre-ignition. The two are completely different and abnormal phenomenon.
Pre-ignition is defined as the ignition of the mixture prior to the spark plug firing. Anytime something causes the mixture in the chamber to ignite prior to the spark plug event it is classified as pre-ignition. The two are completely different and abnormal phenomenon.
Originally Posted by Article
An engine can live with detonation occurring for considerable periods of time, relatively speaking. There are no engines that will live for any period of time when pre-ignition occurs. When people see broken ring lands they mistakenly blame it on pre-ignition and overlook the hammering from detonation that caused the problem. A hole in the middle of the piston, particularly a melted hole in the middle of a piston, is due to the extreme heat and pressure of pre-ignition.
http://www.germanmotorcars.com/Detonation.htm
02-26-2007, 05:49 PM
#53
Originally Posted by kenshi
The prefix "pre" as in the word "prefix" means "before."
Please define:
1. Predetonation as it relates to the combustion cycle of a 4 stroke gasoline engine.
2. Preignition as it relates to the combustion cycle of a 4 stroke gasoline engine.
3. "Pinging" as it relates to the combustion cycle in a 4 stroke gasoline engine.
4." Knocking" as it relates to the combustion cycle in a 4 stroke gasoline engine.
1. Predetonation as it relates to the combustion cycle of a 4 stroke gasoline engine.
2. Preignition as it relates to the combustion cycle of a 4 stroke gasoline engine.
3. "Pinging" as it relates to the combustion cycle in a 4 stroke gasoline engine.
4." Knocking" as it relates to the combustion cycle in a 4 stroke gasoline engine.
2. I edited my previous post to define preignition.
3 and 4 are two different names for the same phenomenon.
02-26-2007, 06:03 PM
#54
Originally Posted by kenshi
Why is predetonation an invalid term?
It doesn't mean an explosion before intended?
I don't understand your explanation of preignition. No doubt I'm an idiot, but please indulge me and reiterate.
What causes the the phenomenon of pinging and knocking?
In short, everything i need to say is already in post #54. If you want to discuss this further, please PM me.
02-26-2007, 06:32 PM
#56
Senior Member
Join Date: May 2004
Location: Vancouver, BC
Posts: 933
kenshi.........take the hint. Predetonation is NOT a term that is used. As explained above, detonation or pinging is the sound made by the shock wave generated by the uncontrolled "explosion" of the air/fuel mixture. The normal controlled rapid burning of the air/fuel mixture (the combustion) is NEVER referred to as a "detonation", so there isn't a "predetonation". And you do understand that with most engines the normal spark ignition initiates the normal combustion well before the piston has reached the top (TDC) of the compression stroke?
02-26-2007, 06:45 PM
#59
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Join Date: Jan 2007
Posts: 311
Originally Posted by P. Samson
kenshi.........take the hint. Predetonation is NOT a term that is used. As explained above, detonation or pinging is the sound made by the shock wave generated by the uncontrolled "explosion" of the air/fuel mixture. The normal controlled rapid burning of the air/fuel mixture (the combustion) is NEVER referred to as a "detonation", so there isn't a "predetonation". And you do understand that with most engines the normal spark ignition initiates the normal combustion well before the piston has reached the top (TDC) of the compression stroke?
02-26-2007, 07:16 PM
#61
Originally Posted by kenshi
No thanks to you.
Just because i couldn't dumb it down to your liking doesn't mean i didn't make an honest effort to explain it to you. For the 20th time, post #54 clearly outlined the differences. You refused to read it.I'll leave this discussion alone. Don't want to get myself into trouble with the moderators. Good day sir...
02-26-2007, 07:47 PM
#62
Member
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Posts: 106
Originally Posted by csmoot
I've done everything you can think of to eliminate the pinging sound around 2k rpm. The only thing that helped was changing the spark plug to a 1 step cooler plug. I don't hear anything anymore, and I'm completely happy w/ the Max again.....
02-26-2007, 08:01 PM
#63
Originally Posted by PoW
What plugs did you change out to?
5= stock heat
4= hotter
6= colder
www.NGK.com has plenty of information regarding heat ratings of spark plugs. Also the context of the latter part of this thread has some insight as to why some members have seen results using 'colder' plugs.
02-26-2007, 08:04 PM
#64
Originally Posted by nismology
A colder plug doesn't mean a weaker spark, contrary to popular belief.
I am still shocked that the cooler plug had no ill effects on performance.
I think this will be my next project but it does suck that I just changed these plugs barely 15k miles ago.
02-27-2007, 12:30 AM
#65
Supporting Maxima.org Member
Join Date: Apr 2005
Posts: 57
I used NGK PLFR6A-11. And to reiterate the cooler plug had no ill effects on perfomance..... My father in law is a mechanic and he suggested to go a cooler plug to cure the pinging sound.
http://www.courtesyparts.com/Merchan...Category_Code=
http://www.courtesyparts.com/Merchan...Category_Code=
03-13-2007, 04:10 PM
#66
Update:
I switched my oil to Castrol Syntec GC 0W-30. I had asked for some opinions on here as far as cutting consumption back since the 30W side is closer to 40W and my previously used Mobil1 5W-30 is much thinner at temperature.
My catch can is usually half full after 500 miles. Tonight at mile 500 of the GC, my catch can is about 1/5 to 1/8 full. I'll keep the dumps in a container just like the other one and see how much I get in 5000 miles.
I switched my oil to Castrol Syntec GC 0W-30. I had asked for some opinions on here as far as cutting consumption back since the 30W side is closer to 40W and my previously used Mobil1 5W-30 is much thinner at temperature.
My catch can is usually half full after 500 miles. Tonight at mile 500 of the GC, my catch can is about 1/5 to 1/8 full. I'll keep the dumps in a container just like the other one and see how much I get in 5000 miles.
03-16-2007, 07:46 PM
#67
Junior Member
Join Date: Sep 2006
Posts: 21
To the original poster. I had the same exact problem, heard all the people saying it was timing chain clatter, or exhaust rattle etc. I know pinging when I hear it. It was getting worse, esp here in GA in the summer. Same as you, more noticeable once warmed up, under light throttle, roughly 1500 to 2000 rpms. I too only use 93 octane, and I changed plugs. No luck.
Finally took it to the dealer. They said it was the MAF. Also that they should clean the throttle body (injectors? not sure), and of course they reset the engine computer.
PROBLEM SOLVED!!! I know there may be many things that cause this, but I am now a happy camper (despite being $585 lighter). She runs like new again. I have a 2000 Maxima, it has 66k miles. Have had 1 ignition coil go bad. Also 2 days after they replaced the MAF, engine light comes on. Still running great. I take her back in, this time they say a bad 02 sensor. Another $220. Sigh. Still, she has been running great again
Finally took it to the dealer. They said it was the MAF. Also that they should clean the throttle body (injectors? not sure), and of course they reset the engine computer.
PROBLEM SOLVED!!! I know there may be many things that cause this, but I am now a happy camper (despite being $585 lighter). She runs like new again. I have a 2000 Maxima, it has 66k miles. Have had 1 ignition coil go bad. Also 2 days after they replaced the MAF, engine light comes on. Still running great. I take her back in, this time they say a bad 02 sensor. Another $220. Sigh. Still, she has been running great again
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