Engine knock

[poochie_albert]

Sir, di ko alam kung D2 ung topic ko

anyway. Nakakasira ba sa makina pag pali nag engine knock or ok lng?
Ano po ba pwede remedies sa engine knock, gamit ko po nissan cefiro with normal unleaded gas

ty poh mga sirs

[niky]

Have all your sensors checked, first. A quick solution to engine knock would be to run it on Blaze or V-Power. I can't remember, but I think the Cefiro specifically requires 95 or greater Octane, so 92 unleaded might be a bit too weak for it.

[userfriendly]

Cefiro requires 95 octane. So you need to use Caltex Gold, Petron XCS plus or Blaze or Shell V Power. Use them and it should solve your engine knock.

[poochie_albert]

Ty po mga sirs. Pero nadadamage ba ung engine pag kumakatok? ty poh ulet

[EssB]

Ty po mga sirs. Pero nadadamage ba ung engine pag kumakatok? ty poh ulet

Knocks can prematurely damage your spark plugs... can also damage the piston rings. At syempre, waste of power... waste of gasoline....

I'm just wondering, wala bang knock sensor ang engine ng Cefiro (automatically retards timing and adjust a/f ratio when knock is detected)?

[non-vtec]

^yes may knock sensor ang cefiro.

i once loaded up with bad fuel and hindi lang knock and detonation ang na-experience ko. pati rough idling.

[vinj]

The Cefiro has a knock sensor but you cannot fully rely on that to prevent knocking.

Try Petron XCS, per my experience ito yung gamay ng Cefiro namin before... it's also one of the cheaper 95 octanes.

[poochie_albert]

Ty po mga sirs ulet. Pero I think wala pa ako nung knock sensor, I forgot to say na A32 year 98 po ung cef ko

[userfriendly]

Are you sure na walang knock sensor ang Cefiro mo? I thought meron, I can be wrong. Since 98 model ka, you definetly need to use 95 Octane fuel. Very sensitive yung early cefiros to fuel. If you load ordinary unleaded aka caltex silver and the like, you are guarnateed to get engine knock. Also your FC will suffer.

[m_ron]

check your owners manual first and see kung what octane it requires.A *true* 93 octane gas is enough for a high powered cars.Also high temp weather can affect engine knocking.Engine knocking will destroy your engine.

[niky]

The Cefiro we get is tuned the same as the JDM Cefiro. Most of our Nissan passenger cars were. Since they're too lazy to retune them for local conditions, most of them from the late 90's time period were stickered "95 Octane Unleaded Only".

Never had any problems from that on the Sentra, but it definitely felt better on higher octane. The Cefiro isn't so lucky.

[m_ron]

The Cefiro we get is tuned the same as the JDM Cefiro. Most of our Nissan passenger cars were. Since they're too lazy to retune them for local conditions, most of them from the late 90's time period were stickered "95 Octane Unleaded Only".

Philippine gov't must mandate car manufacturers to retune all cars and accept 89 or 91 octanes,95 octane on every day traffic conditions is i think a waste of money.How about those ford SUV?here we run them on 89 octane.

[redorange]

Philippine gov't must mandate car manufacturers to retune all cars and accept 89 or 91 octanes,95 octane on every day traffic conditions is i think a waste of money.How about those ford SUV?here we run them on 89 octane.

The Philippines uses a different octane rating than the US, the 89 octane you mention would be a 95 in the Philippines and the 91/93 in the US is a 98 in the Philippines.

[m_ron]

The Philippines uses a different octane rating than the US, the 89 octane you mention would be a 95 in the Philippines and the 91/93 in the US is a 98 in the Philippines.

thanks,Where can i find this info?What is the lowest and highest octane avail. in the the philippines gas pump?

[niky]

I don't know if the info for the Philippine ratings are available online, but the Philippines uses RON (research octane number) versus the US AKI (anti-knock-index). The conversion isn't exact, but what redorange says is approximately correct.

All Japanese market cars can correct down to the supposed "high octane" here, but some cars don't like regular unleaded... I'm not sure, but I think this is also a problem with older Evos (not sure about the new ones).

Lowest in the metro is 92 RON (about 87 AKI), but there are places selling 89 RON Regular (probably as piss poor as 84-85 AKI... I think two stroke motorcycle engines run on this). Highest regular is 95 RON... equivalent to about 90 AKI, while "boutique" gasolines range from 95-97 (maybe 92-93 AKI).

But these conversions aren't exact, as you need to know the MON (Motor Octane Number) of the gas to get the exact conversion (AKI = AVG:RON+MON), so a 95 RON gas could be anywhere between 90 AKI or 95 AKI.

[vinj]

The Cefiro definitely has a knock sensor... (VQ engine).

The highest octane rating commercialy available is on Petron Blaze at 96... used to be 97 pa.