While driving above a certain speed the engine stalls

Tiny
SENSHI CODO
  • MEMBER
  • 2009 MITSUBISHI LANCER
  • 1.6L
  • 4 CYL
  • 2WD
  • MANUAL
  • 28,690 MILES
The car in the highway while the speed above 40 KM/H, it starts to cut-off just like if the car wants to turn off.
Whenever you want to accelerate the car, it starts to get stuck or cutting off, cannot accelerate for a time but after some time it goes normal.
I don't know if the problem is because of type of fuel I am using.

So, what type of gas is this car suitable for?
MO GAS 95 or 9?

Is it because of the fuel being used or it might be another issue?

However, the previous owner of the car was using 91 Fuel gas.
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Saturday, January 29th, 2022 AT 9:45 AM

11 Replies

Tiny
JACOBANDNICKOLAS
  • EXPERT
Fuel type of 91 octane should be perfectly fine. However, based on your description, I question if you are getting enough fuel. The first thing I would recommend is to check fuel pressure. The fuel pump may be weak and unable to keep up with demands.

Here is a link that explains in general how it's done:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

If you have already done this, let me know. Also, let me know if the check engine light is staying on while the engine is running.

Take care,

Joe

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Saturday, January 29th, 2022 AT 2:58 PM
Tiny
SENSHI CODO
  • MEMBER
Hello there,

So, are you trying to say that the fuel itself isn't the real issue?
I don't know if I'm getting enough fuel or not. However, I have noticed that even with super fuel (MO GAS 95) it won't last for long in this car where this car should be an economic one don't you agree? this car can go for almost 450 -500 Kilometers only.

http://mycar.saudiaramco.com/start#/choice
Weird, from the above link, entering my car specs will give me 95 fuel as the suitable one for me. Is it correct? And where to check the real fueling type for my car?

I didn't do that before, But I will do it and let you know ASAP.

Thank you.

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Saturday, January 29th, 2022 AT 6:42 PM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

I looked through the link you provided. It does indicate 95 is okay and 91 is not. If you have the original owner's manual for your vehicle, it should indicate the requirements.

Let me know if you are in the US. I'm not showing the 1.6L in the US.

Take care,

Joe
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Saturday, January 29th, 2022 AT 8:03 PM
Tiny
SENSHI CODO
  • MEMBER
Hello Joe F,

Hmmm, yeah, well I'm not in US actually.
I'm in the middle east in the Gulf Countries (GC).

I don't own the owner's manual because I recently bought this car (2nd hand car).
Also, this car comes under Gulf specifications of my country which is down here in the middle east, so I guess that's why you can find it in the US.

I really got confused about this, I was also asking about the car being cut off
so, what is the relationship between the RPM, cultch slipping and fuel pressure test?
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Sunday, January 30th, 2022 AT 11:12 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

Based on what is happening, I feel the fuel pressure should be tested. The fuel you are using is fine. However, if the pressure is low, it will lose pressure when accelerating or when the engine is under a load causing what you described.

That is where I would start. Is this something you feel comfortable doing? Also, do you have access to a fuel pressure gauge?

Let me know. If I can help, I will.

Take care,

Joe
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Sunday, January 30th, 2022 AT 6:16 PM
Tiny
SENSHI CODO
  • MEMBER
Thanks, dear Joe,
I will try to check my car fuel pump pressure to ensure the thing we were taking about.
However, down here we don't have the much tech to check the pressure of a fuel pump.
Either you have to replace the whole fuel pump or sell the car to someone else, because no one can guess or even figure out the exact issue when it comes to fuel pump diagnostic.

TBH, I don't know much about car and especially the trouble shooting one, but I'm wondering it can be the fuel injection itself making this sort of issue?

Appreciate your effort and cooperation.
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Monday, January 31st, 2022 AT 10:47 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

Absolutely it could be related to the injectors. However, I recommend starting with fuel pressure. If it is off, that is going to cause injector issues.

All you really need to check pressure is a fuel pressure gauge. Is that something you can get your hands on?

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Let me know what I can do to help.

Take care,

Joe
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Monday, January 31st, 2022 AT 5:18 PM
Tiny
SENSHI CODO
  • MEMBER
Joe,

whatever you said and taught me to ensure that I will take it into account.
As per the available checks down here, I don't have access to the fuel pressure gauge.

I have asked more than two mechanics (who are the best) to help me check on the fuel pump functionality by testing the fuel pressure using the pressure gauge. Unfortunately, they said we don't have the tool I asked for and some said we usually don't do this kind of job (because I think they don't know how to.).

So, first step, I will try instead to use the available additives on my car for the following:
Catalytic system, injectors and their combustion champers along with igniting system, engine and fuel system using MANNOL or LIQY MOLY brands for a good result and cleaning.
Do you recommend this sort of additives?

In addition to that, this issue where the car starts losing power (cutting off), is not happening usually, I mean not every day happens but sometimes.

Kind regards,
SenshiCoDo
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Tuesday, February 1st, 2022 AT 9:25 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

Please understand, I am not familiar with the products you mentioned. As far as cleaning the fuel injectors, that is fine. Also, consider replacing the fuel filter as well.

Let me know if I can help.

Take care,

Joe
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Tuesday, February 1st, 2022 AT 3:49 PM
Tiny
SENSHI CODO
  • MEMBER
Understood.
Where exactly is the fuel filter located? Is it inside the fuel tank or on the fuel door?
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Thursday, February 3rd, 2022 AT 2:17 AM
Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

The ones here are in the tank. However, yours could be external. I don't have a way to check. Here is a link that explains how to replace a fuel filter in general.

Take a look through the link and see if you can locate an external one on your vehicle.

https://www.2carpros.com/articles/how-to-change-a-fuel-filter

Let me know what you find.

Joe
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Thursday, February 3rd, 2022 AT 2:22 PM

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