Petrol 90 Or 95

[ashan82]

Dear Members

just to check, what s the petrol type you using for your Mazda?

Coz from last week my FAMILIA 2003 having a problem of giving crrrrr crrrrr sound (engine) when fast accelerating and my Garage fellow advised me to pump 95 octane for some time since the 90 octane is not in the standard quality and therefore there is ignition issue. So i pumped 95 octane yesterday and the wired sound reduce by 90% . Hope this works but don't know what is actually behind this

What you members using for your Mazda's?

Edited May 12, 2012 by ashan82

[varunatech]

Dear Members

just to check, what s the petrol type you using for your Mazda?

Coz from last week my FAMILIA 2003 having a problem of giving crrrrr crrrrr sound (engine) when fast accelerating and my Garage fellow advised me to pump 95 octane for some time since the 90 octane is not in the standard quality and therefore there is ignition issue. So i pumped 95 octane yesterday and the wired sound reduce by 90% . Hope this works but don't know what is actually behind this

What you members using for your Mazda's?

Can you explain the sound a bit more. Is it only fast accelerating or even when you go slow but under a load. The point is under a load, climbing or trying accelerate when you have weight with you. My first hunch is a pre ignition knock, if so pumping 95 will help. But first explain more.

I am not sure about your Mazda model, but as I have see cars manufactured in Japan are designed run on Octane (RON) 91 or above. Sometimes 92 or above. But many Sri Lankan do not read their manuals or if they are in Japanese do not bother to search for further information and just pump 90. I have met people whom seems to be pride and joke at others for pumping 95, while his engine is pretty evidently designed for higher Octane.

You may search the forum, you will find more information.

[H.C]

Dear Members

just to check, what s the petrol type you using for your Mazda?

Coz from last week my FAMILIA 2003 having a problem of giving crrrrr crrrrr sound (engine) when fast accelerating and my Garage fellow advised me to pump 95 octane for some time since the 90 octane is not in the standard quality and therefore there is ignition issue. So i pumped 95 octane yesterday and the wired sound reduce by 90% . Hope this works but don't know what is actually behind this

What you members using for your Mazda's?

As varuna mentioned you need to post more details. You need to confirm wheather its related to ignition or something else. cuz corroded water pump also gives this crr sound when its near to pack up!. Edited May 12, 2012 by H.C

[varunatech]

What is your engine capacity and the engine model. 1.5L ZY-VE seems to be RON 91 or above................

[Ripper]

Dear Members

just to check, what s the petrol type you using for your Mazda?

Coz from last week my FAMILIA 2003 having a problem of giving crrrrr crrrrr sound (engine) when fast accelerating and my Garage fellow advised me to pump 95 octane for some time since the 90 octane is not in the standard quality and therefore there is ignition issue. So i pumped 95 octane yesterday and the wired sound reduce by 90% . Hope this works but don't know what is actually behind this

What you members using for your Mazda's?

that model runs fine on 90. enough and more people are running it on 90 without an issues.

chances are, the sound is related to something else.

And if you can notice a difference in sound when it goes 10% down...i'm betting it's just the placebo effect.

I would get a second opinion from another garage.

[varunatech]

that model runs fine on 90. enough and more people are running it on 90 without an issues.

chances are, the sound is related to something else.

And if you can notice a difference in sound when it goes 10% down...i'm betting it's just the placebo effect.

I would get a second opinion from another garage.

Ripper, if the guys engine has chamber deposits, he may be experiencing pre ignition knocks. The pre ignition knocks goes down considerably when higher Octane is pumped as the higher Octane ignite bit slower.

Would like him to explain more on the sound and the overall experience.

The car might run well on 90, but I have a feeling it is designed for 91 or above and when you pump 90 for a long time the chamber deposits (soot ) is higher, all these time his knock sensor would have done a good job, but probably now the pre ignition is too high it cannot correct.

Let us see what he has to say on the overall experience.

[ashan82]

Can you explain the sound a bit more. Is it only fast accelerating or even when you go slow but under a load. The point is under a load, climbing or trying accelerate when you have weight with you. My first hunch is a pre ignition knock, if so pumping 95 will help. But first explain more.

I am not sure about your Mazda model, but as I have see cars manufactured in Japan are designed run on Octane (RON) 91 or above. Sometimes 92 or above. But many Sri Lankan do not read their manuals or if they are in Japanese do not bother to search for further information and just pump 90. I have met people whom seems to be pride and joke at others for pumping 95, while his engine is pretty evidently designed for higher Octane.

You may search the forum, you will find more information.

Dear Varuna

above ur first para is absolutely correct. That is the issue....So i guess you can help me on this. Please tell what is the solution for this please.

recently (2months ago) i changed my knock sensor under recommendation of my garage man as he scan the car and it diagnosed the sensor too.

my car is Mazda familia BJ5P 1500 CC

Edited May 12, 2012 by ashan82

[Ripper]

Ripper, if the guys engine has chamber deposits, he may be experiencing pre ignition knocks. The pre ignition knocks goes down considerably when higher Octane is pumped as the higher Octane ignite bit slower.

Would like him to explain more on the sound and the overall experience.

The car might run well on 90, but I have a feeling it is designed for 91 or above and when you pump 90 for a long time the chamber deposits (soot ) is higher, all these time his knock sensor would have done a good job, but probably now the pre ignition is too high it cannot correct.

Let us see what he has to say on the overall experience.

2003 YOM is a pretty old car isn't it? And it's not a rare car at all. If 95 is required for this, I'm sure we should be hearing of this problem a lot more often.

a "crrrrr crrrrr" sound from the motor doesn't really sound like and engine knock, neither a deposit related issue.

anyways....just sharing my 2 cents ")

[ashan82]

2003 YOM is a pretty old car isn't it? And it's not a rare car at all. If 95 is required for this, I'm sure we should be hearing of this problem a lot more often.

a "crrrrr crrrrr" sound from the motor doesn't really sound like and engine knock, neither a deposit related issue.

anyways....just sharing my 2 cents ")

but after i pumped 95 it reduced the issue by abt 90% and think the balance 10% coz the tank had some level of 90 petrol too

further to above info as i discussed in some other post, my last car service they have put Shell 20w-50 oil to my car and dont know its affect to this issue

[varunatech]

Dear Varuna

above ur first para is absolutely correct. That is the issue....So i guess you can help me on this. Please tell what is the solution for this please.

recently (2months ago) i changed my knock sensor under recommendation of my garage man as he scan the car and it diagnosed the sensor too.

my car is Mazda familia BJ5P 1500 CC

Friend, what I can do is guide you from my experience, and from what I see in as text in the forum. It is different from seeing your car and also driving and later having a preliminary look at your throttle body, air intake system etc...

My point is, take the guidance, go to a reputed place, not to a maka bas. Even when you get to a reputed place, the guidance and your own common sense will help, I have seen reputed places doing worst than maka bass.

By the way, if you are experiencing a knuck, knuck type of sound (as Ripper says not a Crrr Crr sound), (some yaka bass call it ignition gahanawa) and if it goes away with 95 Octane most probably you have a pre ignition knock issue due to chamber soot and the red hot carbon firing the fuel mixture before timing.

Does this noise goes off if you apply more gas or shift to a lower gear and apply gas.........if so 99% it is the case.

And if it is the case........you can remove majority of the soot by doing an fuel intake system cleaning........this works most of the time

both 3M and BG does a good job while there are other brands as well. My experience is mostly with BG, where it has got dramatic results. But know that 3M and seaform works while I am yet to find seafoam in Sri Lanka.

You can follow this with an injector cleaning with Ultrasonic (best way) or again using liquids from 3M or BG. For Ultrasonic go to D**O or An***su (search the forum).

Above is the cheaper and practical way of doing this.

Again, you need to identify the sound, it should go away when you apply more gas and with 95. Still............show it to someone with experience then he can listen and feel while driving.

Secondly why 20W 50. The 50 is too high for your car...........I am surprised.

When I checked, but not confirmed the 2003 q.5L engine is designed for RON 91 r above.

[tom]

but after i pumped 95 it reduced the issue by abt 90% and think the balance 10% coz the tank had some level of 90 petrol too

As per My knowledge, Mazda Engine would prefer 90+ Octain .. ( Extra premium OR 95 Octain )

[ashan82]

Friend, what I can do is guide you from my experience, and from what I see in as text in the forum. It is different from seeing your car and also driving and later having a preliminary look at your throttle body, air intake system etc...

My point is, take the guidance, go to a reputed place, not to a maka bas. Even when you get to a reputed place, the guidance and your own common sense will help, I have seen reputed places doing worst than maka bass.

By the way, if you are experiencing a knuck, knuck type of sound (as Ripper says not a Crrr Crr sound), (some yaka bass call it ignition gahanawa) and if it goes away with 95 Octane most probably you have a pre ignition knock issue due to chamber soot and the red hot carbon firing the fuel mixture before timing.

Does this noise goes off if you apply more gas or shift to a lower gear and apply gas.........if so 99% it is the case.

And if it is the case........you can remove majority of the soot by doing an fuel intake system cleaning........this works most of the time

both 3M and BG does a good job while there are other brands as well. My experience is mostly with BG, where it has got dramatic results. But know that 3M and seaform works while I am yet to find seafoam in Sri Lanka.

You can follow this with an injector cleaning with Ultrasonic (best way) or again using liquids from 3M or BG. For Ultrasonic go to D**O or An***su (search the forum).

Above is the cheaper and practical way of doing this.

Again, you need to identify the sound, it should go away when you apply more gas and with 95. Still............show it to someone with experience then he can listen and feel while driving.

Secondly why 20W 50. The 50 is too high for your car...........I am surprised.

When I checked, but not confirmed the 2003 q.5L engine is designed for RON 91 r above.

Varuna

Pls PM ur contact number pls

[varunatech]

Varuna

Pls PM ur contact number pls

sent

[Thanushka]

Hi I don't know whether this would help, but my car also gave a wired sound when accelerating without any load, and found out that I needed to change the gear box oil. Once done, the sound was gone. My car is 1996 Mazda BG3P.

[soulja]

Well Ashan, this ain't a "crrrrr crrrr" sound. the garage fellas call it the ''kata kata'' sound. i've gone through this before. I assume your engine's filled with a lot of carbon, get an engine tune up done and start pumping OCT 93(very rare to find in petrol pumps) or OCT 95. cheers..

[trinity]

Hi All

After reading the thread, i thought to share my experience with a similar situation like this..

Couple of weeks back i noticed the same kind of noise from my Lancer as well. It came only when the rev hits about 3000. So i placed the car at my mechanics last week to diagnose the issue. When i inquired him of the situation, he told me that he did two things,

1. Cleaned the plugs

2. Replaced the Air Filter (It was about a year old)

He said that the noise came from the plugs and asked me to use 93 or 95OCT in future. I'm using this car for almost three years and i usually pumped 90 OCT. When i told him about this his answers was that, These days 90 OCT is not up to the standard and its better to avoid it. So i pumped 93 from IOC and up to now driven about 300kms with no issue at all.

I'm unable to provide in depth technical information in this regard as my knowledge in motor mechanics is very limited. Also its still early to tell that the bad petrol was causing the issue as i had a old air filter too. The mechanic is a very trustworthy and skilled guy who has earned the trust of many motorists in Kalutara area. So i dont have any second thoughts of his work. So its possible that 90 OCT causing trouble here & there for some motorists.. Just my two cents on this subject..

Ah almost forgot.. car is a brand new import and has a 1.3 carb engine.

Cheers..

[KI4120]

First of all...try to find the RON for this engine... RON - Researched Octal Number, and then apply the correct fuel !

[jdnet]

Not this 95 crap again. You don't need 95 for your 323. You should check the car for other problems like plugs and O2 sensors. Even my mazda suv uses 90 without any issues. The only time I use 95 is in the io.

This whole "sound reduced by 90%" thing is crap too. Either the issue is there or iit isn't. Reminds me of the people that claim their car runs better after getting it washed.

Edited May 16, 2012 by jdnet

[ashan82]

Hi All

After reading the thread, i thought to share my experience with a similar situation like this..

Couple of weeks back i noticed the same kind of noise from my Lancer as well. It came only when the rev hits about 3000. So i placed the car at my mechanics last week to diagnose the issue. When i inquired him of the situation, he told me that he did two things,

1. Cleaned the plugs

2. Replaced the Air Filter (It was about a year old)

He said that the noise came from the plugs and asked me to use 93 or 95OCT in future. I'm using this car for almost three years and i usually pumped 90 OCT. When i told him about this his answers was that, These days 90 OCT is not up to the standard and its better to avoid it. So i pumped 93 from IOC and up to now driven about 300kms with no issue at all.

I'm unable to provide in depth technical information in this regard as my knowledge in motor mechanics is very limited. Also its still early to tell that the bad petrol was causing the issue as i had a old air filter too. The mechanic is a very trustworthy and skilled guy who has earned the trust of many motorists in Kalutara area. So i dont have any second thoughts of his work. So its possible that 90 OCT causing trouble here & there for some motorists.. Just my two cents on this subject..

Ah almost forgot.. car is a brand new import and has a 1.3 carb engine.

Cheers..

Hi Trinity

the mechanic you talking about is Chamila??

[ashan82]

Not this 95 crap again. You don't need 95 for your 323. You should check the car for other problems like plugs and O2 sensors. Even my mazda suv uses 90 without any issues. The only time I use 95 is in the io.

This whole "sound reduced by 90%" thing is crap too. Either the issue is there or iit isn't. Reminds we of the people that claim their car runs better after getting it washed.

jdnet

only i can tell for this time being is, i used to pump 90 OCT petrol for my mazda (this is my second mazda) and this happened only from last couple of weeks. but after i pumped 95 oct and ran abt 200km, the wired sound is almost gone by 99%. So i dont know what is technical background behind this but one good engineer advised me to pump petrol 91oct & above as mazda engine is recommended for 91 and above

Any way im hoping to have good engine tune up from D**O too

[NPP]

jdnet

only i can tell for this time being is, i used to pump 90 OCT petrol for my mazda (this is my second mazda) and this happened only from last couple of weeks. but after i pumped 95 oct and ran abt 200km, the wired sound is almost gone by 99%. So i dont know what is technical background behind this but one good engineer advised me to pump petrol 91oct & above as mazda engine is recommended for 91 and above

Any way im hoping to have good engine tune up from D**O too

maybe a coincidence. now pump 90oct and run 200km and see

[VVTi]

I dunno about you guys, but both mine clearly says Octane 91-98 on the fuel cap... so I have no issues with either of the fuels we have in SL. I mostly pump 90 and so far never had an issue with crrr or brrr or prrrr noises...

[Komisiripala]

Hi All

After reading the thread, i thought to share my experience with a similar situation like this..

Couple of weeks back i noticed the same kind of noise from my Lancer as well. It came only when the rev hits about 3000. So i placed the car at my mechanics last week to diagnose the issue. When i inquired him of the situation, he told me that he did two things,

1. Cleaned the plugs

2. Replaced the Air Filter (It was about a year old)

He said that the noise came from the plugs and asked me to use 93 or 95OCT in future. I'm using this car for almost three years and i usually pumped 90 OCT. When i told him about this his answers was that, These days 90 OCT is not up to the standard and its better to avoid it. So i pumped 93 from IOC and up to now driven about 300kms with no issue at all.

I'm unable to provide in depth technical information in this regard as my knowledge in motor mechanics is very limited. Also its still early to tell that the bad petrol was causing the issue as i had a old air filter too. The mechanic is a very trustworthy and skilled guy who has earned the trust of many motorists in Kalutara area. So i dont have any second thoughts of his work. So its possible that 90 OCT causing trouble here & there for some motorists.. Just my two cents on this subject..

Ah almost forgot.. car is a brand new import and has a 1.3 carb engine.

Cheers..

Is the mechanic Ajith?

[NRX]

I think the noise you are mentioning has something to do with your 20W50 adventure

[trinity]

Hi Trinity

the mechanic you talking about is Chamila??

Hi ashan82

Yes.. he is Chamila... have you been to his place???