Why do 1996 VH45DE's sludge up compared to other VH45DE's

[Infinitiguy19]

I have see at least twice in two separate posts by Dennis (Q45Tech) that T3 has seen 1996 Q45's that had engines so badly sludged up. That a tech at T3 (Forgot the name I think Ty) made a trap door on the oil pan to completely empty the oil pan.

Does the different cam have anything to do with it?

Or the fact that there is no VTC?

Those are the only theories that could cause that. Of course there is owner abuse but these aren't typical engines you see sludged up all the time and I myself have only heard this twice.

I just want to know.

[qship96]

Owner abuse. My 96 is clean as new inside at 231,400 miles. Most old Q have been through 5-6-7-10 owners each one poorer than the last and paying less for the car and therefor caring less about rigorous maintenance.Finally the old tired car meets its doom with some kid like berner who drives it into the ground.

[Infinitiguy19]

Well I do not doubt, you but do you possibly have pictures at all?

I have taken apart a 1991 Q45 with a 1994 intake runner and possibly bad chain guides (Because the motor was very hard to turn with a braker bar). And it looked OK not clean but not bery sludged up. I took off the oil pan and both valve covers (Even though I lost one).

And lets be fair. Berner may have not been NICO member of the year but its not fair to talk about him if he is not here to respond.

[mtzgr777]

Talking about cleaning up the engine.....

I bought some formula that I'm planning on putting in some CRC "Guaranteed To Pass Emissions formula" into my next full tank load.

My question is, do you guys think it's safe, or should I stay away?

My reason for putting it in is that I had a knock sensor code that came up a couple weeks ago that I had reset that may cause me to fail emissions that is coming up soon....

Let me know what you guys think.

or

[qship96]

Knock sensor code will not heal itself with any magic potions or sparkplug changes- only way to fix the problem is to replace the sensors and their harness, which requires plenum removal .

I bet more than 50% of all Nissan/Infiniti cars on the road today have defective knock sensors and the code for them stored.....according to EPA it is the most common code found on Nissan products brought in for emissions testing. Obviously Nissan needs to rethink{upgrade durability} the design spec of their knock sensors.

[Q45tech]

Why since I have never seen a cracked knock sensor before 100K or 7 years of service. Seems like the engineers focused with a laser on durability.

Used cars are purchased as is and hopefully people educate themselves prior to purchasing.

[qship96]

One only needs to look at GM or Chrysler to see what happens when engineers design parts to only last 7 years or 100,000 miles..........consumers are no longer tolerating that mentality, and have voted with their checkbooks

there is a reason only 1 in 10 of all new cars purchased under the clunker program are from the "big three" domestic manufacturers......despite them being often the lowest cost provider of transportation appliances.

Toyota/Nissan/Honda only became popular and took market share due to their one advantage over the domestics.......quality and durability- if they let that slide, well they have a role model to see the effects it will create.

[mtzgr777]

My father replaced the knock sensors on his '02 Maxima for $1400. Have yet to feel a difference at all. We think the card reader at the dealership was either rigged or faulty. That is why I'm going to wait to see if the SES light comes back on. (It hasn't in 15 miles of driving.)

[maxnix]

My father replaced the knock sensors on his '02 Maxima for $1400. Have yet to feel a difference at all.

Why Barry Manilow tuning (Feeeeeeeeelliinnnngs) is useles.

One must measure quantitatively. KS are tirvial to measure with any DVM.

[qship96]

My father replaced the knock sensors on his '02 Maxima for $1400. Have yet to feel a difference at all. We think the card reader at the dealership was either rigged or faulty. That is why I'm going to wait to see if the SES light comes back on. (It hasn't in 15 miles of driving.)

Faulty defective knock sensors WILL NEVER CAUSE the engine lamp to illuminate, it just silently stores a fault code in ECU.

[mtzgr777]

Darn stealerships.

[SleepinTXQ45]

ok, i havent been on in awhile or spoken much but..... i do have some things to say about this thread.........

My father replaced the knock sensors on his '02 Maxima for $1400. Have yet to feel a difference at all. We think the card reader at the dealership was either rigged or faulty. That is why I'm going to wait to see if the SES light comes back on. (It hasn't in 15 miles of driving.)

did u reset the ecm???? to be simple.... its in retarded mode so u dont kill it!!! it is smart enough to know to save itself, & also 15 miles isnt long enough...... so pull the ecm fuse(s) for awhile...then see waht happens. it can relearn that its not dead & can advance timing to where it belongs or better . u probably didnt but do that & drive it like u stole it... it will make a difference..... as long as everything else is working correctly.

Faulty defective knock sensors WILL NEVER CAUSE the engine lamp to illuminate, it just silently stores a fault code in ECU.

iwill have to disagree with u on that, older non OBD2 yes, new no. it is a emissions problem for those that have tests 7 without test, still if i doesnt bring it on the light it still has a code & its a expensive fix to make EPA happy...... to epa measures it has not finished drive cycle &or light on... will fail test. & more then not, i have cleared codes on many nissan & gm trucks for knock codes, which are common & they still, light comeback on right away

& how did we get from the oem subject thread at hand to this...... mine at 175k is clean.

i would use BG products only...... not to sell, they actually work!!! just not for anything else find a good shop that does FI services... intake clean,injector, & intank stuff. this all cleans everything top of pistons, ect. the shot so to speak.

i wont start with the others of the GM & Dodge topic.....another thread plz

[qship96]

You are incorrect on both counts as far as how the 90-96Q operates.........

[SleepinTXQ45]

wow really.... really.......im sorry but u really didnt read closely im guessing. 1st & second are correct in that was being discussed.... 02 maxima.......

yes it is different compared to ANY nissan product pre OBD2 spec....... just cause i disagreed with u thats what ur coming back with..........ahhhhh wow.

so i dont know where u were going with this, but thanks for pointing that out.

maybe im missing something...... so im sorry for giving out wrong info.........