3.5 L. oil burner
08-28-2007, 02:44 AM
#41
Originally Posted by Maxim(a)SerjVQ
Most examples are doing serious miles in pretty harsh conditions.
While it doesn't concern me too much at this point, that will obviously change if my engine decides to seize at 100 or 110k. For an engine that's ranked as well as the VQ, there shouldn't be so many stories of early replacement and major repairs. I wonder if the people rating these engines are aware of some of these issues, or if they only focus on how the engine runs with no problems...
08-28-2007, 06:24 AM
#43
All I can say is never go by the dipstick if you want a good reading. If I check the oil an hour after driving the car (when the engine is still hot), the oil wont be splattered all over the place but the reading is above the full line by a bit...check back in another 10 hours and its right at the full mark...I dunno, I just live with it. its a small price (imo) to pay for what you get out of the car.
08-28-2007, 07:22 AM
#44
That Nissan tech is full of ****. There is no coating on the cylinder walls, and pistons on ALL Nissans are coated. A cheap mod on a SR20 is installing 54C pistons out of a JDM spec GTi-R motor- which are alot stronger. These are also coated, just like every other Nissan pistons.
Reason for the oil burning is that Nissan switched to different piston rings, these wear out and in some severe cases the ring lands get destroyed. This is why compression is low, and the engine gets all nasty inside- blow by.
I've seen these blown motors in person, ya....its the rings and ring lands on the pistons.
Reason for the oil burning is that Nissan switched to different piston rings, these wear out and in some severe cases the ring lands get destroyed. This is why compression is low, and the engine gets all nasty inside- blow by.
I've seen these blown motors in person, ya....its the rings and ring lands on the pistons.
08-28-2007, 07:31 AM
#45
Originally Posted by SLVRMAXX
All I can say is never go by the dipstick if you want a good reading. If I check the oil an hour after driving the car (when the engine is still hot), the oil wont be splattered all over the place but the reading is above the full line by a bit...check back in another 10 hours and its right at the full mark...I dunno, I just live with it. its a small price (imo) to pay for what you get out of the car.
Does anybody know if Nissan will replace an engine for burning excessive amounts of oil after the warranty expires, or is that just a stupid question? Thanks.
08-28-2007, 11:40 AM
#46
Nissan won't change your light bulb once the warranty expires. Let alone a 3+K dollar long block.
Unless you have had oil consumption problems in the past- while in warranty, there is NOTHING you can do, short of some kinda law suit which you will need tons of proof for in order to have a valid case against them.
Unless you have had oil consumption problems in the past- while in warranty, there is NOTHING you can do, short of some kinda law suit which you will need tons of proof for in order to have a valid case against them.
08-28-2007, 09:46 PM
#47
Originally Posted by BlackBIRDVQ
Nissan won't change your light bulb once the warranty expires. Let alone a 3+K dollar long block.
Unless you have had oil consumption problems in the past- while in warranty, there is NOTHING you can do, short of some kinda law suit which you will need tons of proof for in order to have a valid case against them.
Unless you have had oil consumption problems in the past- while in warranty, there is NOTHING you can do, short of some kinda law suit which you will need tons of proof for in order to have a valid case against them.
09-01-2007, 11:18 PM
#50
Actually we have replaced a motor while the car was out of its 5/100 power train warrenty. Out of the good-will program, the guy had all the recommended services done and was a good customer so we did it. I think he was at 104,000kms, barely out of warrenty though. All the pathfinders were R50's, and now that BlackBIRDVQ mentioned it, the motors were all a mess, and i remember looking at the ring/ring lands and they were in pretty bad shape.
This reminds me of the 7MGTE in the supra, toyota changed the head gasket material but didnt change the torque spec, which is why so many mk3 supras suffer from BHG.
On topic, my 3.5 burns VERY little oil if at all any. I notice if i leave it for 8000km, it is a BIT low on the dipstick, maybe 1/8th of an inch from the H level. Not enough to warrent a concern IMO.
BlackBIRDVQ about what the tech said, i honestly didnt know, ive never really learned enough about the VQ to know whether or not, but i know this tech sometimes gets **** confused, i argued with him that my cars main cat was underneath my drivers seat. he was convinced i removed my main cat when i installed my y-pipe, he kept thinking my pre-cat was the main cat. He is an idiot at times, theres reasons why we call him dr.overkill at work
This reminds me of the 7MGTE in the supra, toyota changed the head gasket material but didnt change the torque spec, which is why so many mk3 supras suffer from BHG.
On topic, my 3.5 burns VERY little oil if at all any. I notice if i leave it for 8000km, it is a BIT low on the dipstick, maybe 1/8th of an inch from the H level. Not enough to warrent a concern IMO.
BlackBIRDVQ about what the tech said, i honestly didnt know, ive never really learned enough about the VQ to know whether or not, but i know this tech sometimes gets **** confused, i argued with him that my cars main cat was underneath my drivers seat. he was convinced i removed my main cat when i installed my y-pipe, he kept thinking my pre-cat was the main cat. He is an idiot at times, theres reasons why we call him dr.overkill at work
09-02-2007, 04:36 PM
#51
Originally Posted by 96blkonblkse
Actually we have replaced a motor while the car was out of its 5/100 power train warrenty. Out of the good-will program, the guy had all the recommended services done and was a good customer so we did it. I think he was at 104,000kms, barely out of warrenty though. All the pathfinders were R50's, and now that BlackBIRDVQ mentioned it, the motors were all a mess, and i remember looking at the ring/ring lands and they were in pretty bad shape.
This reminds me of the 7MGTE in the supra, toyota changed the head gasket material but didnt change the torque spec, which is why so many mk3 supras suffer from BHG.
On topic, my 3.5 burns VERY little oil if at all any. I notice if i leave it for 8000km, it is a BIT low on the dipstick, maybe 1/8th of an inch from the H level. Not enough to warrent a concern IMO.
BlackBIRDVQ about what the tech said, i honestly didnt know, ive never really learned enough about the VQ to know whether or not, but i know this tech sometimes gets **** confused, i argued with him that my cars main cat was underneath my drivers seat. he was convinced i removed my main cat when i installed my y-pipe, he kept thinking my pre-cat was the main cat. He is an idiot at times, theres reasons why we call him dr.overkill at work
This reminds me of the 7MGTE in the supra, toyota changed the head gasket material but didnt change the torque spec, which is why so many mk3 supras suffer from BHG.
On topic, my 3.5 burns VERY little oil if at all any. I notice if i leave it for 8000km, it is a BIT low on the dipstick, maybe 1/8th of an inch from the H level. Not enough to warrent a concern IMO.
BlackBIRDVQ about what the tech said, i honestly didnt know, ive never really learned enough about the VQ to know whether or not, but i know this tech sometimes gets **** confused, i argued with him that my cars main cat was underneath my drivers seat. he was convinced i removed my main cat when i installed my y-pipe, he kept thinking my pre-cat was the main cat. He is an idiot at times, theres reasons why we call him dr.overkill at work
Suppose they find the precats to be bad...is it already too late for the new engine? Im guessing its probably damaged already
09-02-2007, 05:27 PM
#54
Member
Join Date: Jan 2007
Posts: 41
So far the car has 90 000km and doesnt burn a bit of oil.I used to drive it hard but I decided that before it would start burning oil I would let loose on the gas pedal.My car is automatic and its a 2002 gxe.
Im thinking about selling the car next summer before the car decides to break down massively.I already changed the oil pan the MAF and Im having tranny issues right now wich is covered by my extended motor tranny warranty.
Reason why I say thinking is that I really love this car despite the troubles I've had with it so far.Im asking myself what I could buy for the same amount of money I spend on payments per month and only found econoboxes.So I guess im going to stick with the Maxima.
Since the car started to broke down, im having a love hate relationship with it.
Im thinking about selling the car next summer before the car decides to break down massively.I already changed the oil pan the MAF and Im having tranny issues right now wich is covered by my extended motor tranny warranty.
Reason why I say thinking is that I really love this car despite the troubles I've had with it so far.Im asking myself what I could buy for the same amount of money I spend on payments per month and only found econoboxes.So I guess im going to stick with the Maxima.
Since the car started to broke down, im having a love hate relationship with it.
09-02-2007, 05:27 PM
#55
Originally Posted by SLVRMAXX
thats understood by everyone...but I have a feeling the bad precats increase backpressure which in someway messes up the rings...
09-02-2007, 05:47 PM
#56
Originally Posted by soonerfan
rings cause the problem on their own...not the precats
off topic: Im buying an extended warranty from nissan just to be completely on the safe side so I wont have to worry about this anymore...
09-02-2007, 05:49 PM
#57
Originally Posted by SLVRMAXX
so why is there so much talk of precats? whats the worst bad precats can do to an engine? can it contribute to oil loss in any way or will it just shoot debris in the engine?
off topic: Im buying an extended warranty from nissan just to be completely on the safe side so I wont have to worry about this anymore...
off topic: Im buying an extended warranty from nissan just to be completely on the safe side so I wont have to worry about this anymore...
09-02-2007, 10:21 PM
#59
Ok the debris from the cats dissintegrating get sucked into the combustion chambers on deceleration- durring reversion of exhaust gases. This is done to create an EGR effect without acutally having an EGR system on the car.
These debris will harm the rings and score up the cylinder walls. Rings will not seal the cylinder 100% and you end up with VERY dirty oil, tons of blow by and bad oil consumption.
In order to fix this. Headers.
This is why so many Maximas with headers do not burn oil- because they had em installed early in their life and they have no oil burning problems. That is MY take on this.
These debris will harm the rings and score up the cylinder walls. Rings will not seal the cylinder 100% and you end up with VERY dirty oil, tons of blow by and bad oil consumption.
In order to fix this. Headers.
This is why so many Maximas with headers do not burn oil- because they had em installed early in their life and they have no oil burning problems. That is MY take on this.
09-03-2007, 01:10 AM
#60
Supporting Maxima.org Member
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Join Date: Apr 2003
Location: the OC & Silicon Valley
Posts: 2,586
Originally Posted by BlackBIRDVQ
Ok the debris from the cats dissintegrating get sucked into the combustion chambers on deceleration- durring reversion of exhaust gases. This is done to create an EGR effect without acutally having an EGR system on the car.
These debris will harm the rings and score up the cylinder walls. Rings will not seal the cylinder 100% and you end up with VERY dirty oil, tons of blow by and bad oil consumption.
In order to fix this. Headers.
This is why so many Maximas with headers do not burn oil- because they had em installed early in their life and they have no oil burning problems. That is MY take on this.
These debris will harm the rings and score up the cylinder walls. Rings will not seal the cylinder 100% and you end up with VERY dirty oil, tons of blow by and bad oil consumption.
In order to fix this. Headers.
This is why so many Maximas with headers do not burn oil- because they had em installed early in their life and they have no oil burning problems. That is MY take on this.
No, it's not JUST the rings.
09-03-2007, 11:24 AM
#61
It's just the rings! I go through at least a qrt every 1k miles and I have had headers since before the problem. I installed headers after reading the cats caused the problem and it still happened to me.
09-03-2007, 11:45 AM
#62
what mileage were the headers installed and when did you notice the oil burn problem?
plus the precats probably already did the damage before the headers came on but you started to notice it when you had the headers
plus the precats probably already did the damage before the headers came on but you started to notice it when you had the headers
09-03-2007, 04:15 PM
#63
Originally Posted by SLVRMAXX
what mileage were the headers installed and when did you notice the oil burn problem?
plus the precats probably already did the damage before the headers came on but you started to notice it when you had the headers
plus the precats probably already did the damage before the headers came on but you started to notice it when you had the headers
09-03-2007, 04:30 PM
#64
You were probbaly a little too late. But then again, the pre-cats dont start to decompose untill the oil burning is probably already an issue. and yes that was one of main problems with the 2.5, was the cat falling apart and getting sucked back into the engine, and wreaking havoc from there on. I am not really surprised, now that it has been mentioned, i remember one of those pathfinders had a fairly large chunk of the pre-cat missing. reminded me of a honey comb but smaller lol.
09-03-2007, 05:21 PM
#66
Originally Posted by SLVRMAXX
will a bad precat yield an SES or MIL light? I mean it would obviously mean there is catalyst inefficiency...
a precat only works until the main cats heats up and can work effectively. that doesnt take long at all.
09-03-2007, 05:35 PM
#67
Originally Posted by 96blkonblkse
You were probbaly a little too late. But then again, the pre-cats dont start to decompose untill the oil burning is probably already an issue. and yes that was one of main problems with the 2.5, was the cat falling apart and getting sucked back into the engine, and wreaking havoc from there on. I am not really surprised, now that it has been mentioned, i remember one of those pathfinders had a fairly large chunk of the pre-cat missing. reminded me of a honey comb but smaller lol.
09-03-2007, 06:55 PM
#68
yea I highly doubt the main cat debris would get sucked up all the way into the cumbustion chamber...hmm
when you checked your precats was there 2 mesh filters on each end of the precat inside?
when you checked your precats was there 2 mesh filters on each end of the precat inside?
09-03-2007, 08:17 PM
#72
09-03-2007, 08:52 PM
#73
http://forums.nycmaximas.org/showthread.php?t=20592
4th pic down shows what you are talking about. It just doesn't look familiar to me. Maby I'm just getting forgetful or thinking of another car I've worked on but I could of swore my precats didn't have that screen. Oh well doesn't really matter anyway.
I would think that the screen would prevent the cats from being sucked up in the engine
4th pic down shows what you are talking about. It just doesn't look familiar to me. Maby I'm just getting forgetful or thinking of another car I've worked on but I could of swore my precats didn't have that screen. Oh well doesn't really matter anyway.
I would think that the screen would prevent the cats from being sucked up in the engine
09-04-2007, 08:13 AM
#75
Senior Member
Join Date: Aug 2000
Location: Chicago, Illinois
Posts: 815
Originally Posted by BlackBIRDVQ
Nissan won't change your light bulb once the warranty expires. Let alone a 3+K dollar long block.
Unless you have had oil consumption problems in the past- while in warranty, there is NOTHING you can do, short of some kinda law suit which you will need tons of proof for in order to have a valid case against them.
Unless you have had oil consumption problems in the past- while in warranty, there is NOTHING you can do, short of some kinda law suit which you will need tons of proof for in order to have a valid case against them.
nissan covered it without askin questions, since i did every single oil change (every 3K miles on the dot) through the dealership
i think that some motor driven in a spirited manner tend to burn oil earlier, since they are pushed harder
09-04-2007, 09:55 AM
#77
Originally Posted by Stereodude
So, is there a way to fix the oil consumption short of replacing the motor?
09-04-2007, 11:45 AM
#78
Senior Member
Join Date: Sep 2001
Location: Detroit Metro Area
Posts: 1,617
Originally Posted by MintVQ35
There are additives and "mystery oils" that claim to decrease oil consumption, but in reality if the rings are the cause there is nothing you can do short of replacing the rings and having the cylinders cleaned up/honed.
09-04-2007, 12:49 PM
#79
Originally Posted by Stereodude
Is there any reason to believe that the 2nd set of rings and honed / cleaned-up cylinders won't do the same thing?
09-04-2007, 01:02 PM
#80
Senior Member
Join Date: Sep 2001
Location: Detroit Metro Area
Posts: 1,617
Originally Posted by nk2k2
i would assume that when doing a rebuild that one would use aftermarket rings instead of factory rings for obvious reasons. i don't think there is a break in procedure for the rings? i have the oil burning issue and if i was to ever rebuild, then i would deff go with aftermarket rings from reputable company and also run regular dino oil in it. dont think going to synthetic is going to make a difference.