Vq25Det Cold Running Sound

[MrStabby]

I just test drove a nice NM35 and the engine ran powerfully and smoothly, but to me it sounded a bit like a modern diesel motor when idling after cold start. The owner said its always been like that and that it goes away once warm, which seemed to be right. Am i being paranoid because i'm unfamiliar with the way the motor should sound or should i get it looked at? Car has 135,000 kms.

[ClassOne]

Shouldn't sound like that.

You could assume its had a hard life? Blow smoke on start at all? Or after coasting then on the gas again?

If its tapping away it could have lifter issues.

Did you check the oil quality and quantity?

And last service interval?

[MrStabby]

 

Shouldn't sound like that.

You could assume its had a hard life? Blow smoke on start at all? Or after coasting then on the gas again?

If its tapping away it could have lifter issues.

Did you check the oil quality and quantity?

And last service interval?

Didnt see any smoke at all. Didnt sound like lifters to me (my RB26 has a little lifter noise and its different), but i cant be sure. Didnt check the oil, but he said the oil is changed every 5K with full synthetic.

[Daleo]

Shouldn't be noisy at all.

Maybe a worn timing chain? Could have had a haircut, and be wearing significantly more kays.

[scotty nm35]

They sometimes sound rattly when mechanics use a 5w30, but I would stay away if you can't prove what is causing the noise.

[m35stagea]

Mine sounds like a diesel too.. as with others I have see .

[66yostagea]

Check all what the others say, if that dont fix it give it compression test. Cold and dry and warm and wet

[ironpaw]

Mine sounds like a diesel....

When its on LPG

[MrStabby]

They sometimes sound rattly when mechanics use a 5w30, but I would stay away if you can't prove what is causing the noise.

Found out its running Penrite syth 5W-30.

[ClassOne]

what oil viscosity do you guys run?

i thought the recommendation was a 5w40?

or was that 10w40?

[m35stagea]

10 40

[Daleo]

I run Gulf Western Syn-X 6000 5W/40.

No diesel here.

Edited April 29, 2013 by Daleo

[ironpaw]

5W40 here

[iamhe77]

10w30 (Neo Platinum). Runs beautifully.