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Ask Amedee Your Own Question
Amedee
Amedee, Mitsubishi Technician
Category: Mitsubishi
Satisfied Customers: 25832
Experience:  ASE Technician advanced level specialist. Wisconsin certified emissions state inspector
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There's a misfire or similar when the car is in low revs or

Customer Question

there's a misfire or similar when the car is in low revs or the accelerator is pushed down hard (at higher speeds). It also occurs when the fuel tank is less than half full and around corners.
JA: Has the vehicle turned into a gas hog? And how does it start -- same as usual?
Customer: same as usual start and no on the gas.
JA: What is the model/year of your Mitsubishi?
Customer: 98 mirage CE 1.5l
JA: Are you fixing your Mirage yourself? What have you tried so far?
Customer: the following has been done;
JA: Anything else you want the mechanic to know before I connect you?
Customer: new spark plugs, new oil filter, fuel filter, air filter, fuel cleaner put through it, new oil, new tappa gasket
Submitted: 8 months ago.
Category: Mitsubishi
Expert:  Amedee replied 8 months ago.

Hello and welcome!

My name isCustomerand I can assist you with your question.

Expert:  Amedee replied 8 months ago.

Can I get the code number or numbers in the computer?

What is the fuel pressure at when this happens?

Customer: replied 8 months ago.
I I have no ideaCustomer I don't have anything attached at those points.
Expert:  Amedee replied 8 months ago.

Hello and thank you for being honest. NO problem.

The reason I ask is because the fuel pressure is going to need to be checked especially based on your description. The engine bogs down or misfires under a load and or when turning and the fuel tank is less than half full.

The fuel pressure spes on this vehicle are 38 psi at idle and 47 to 50 psi under a load.

If the fuel pressure is low when this condition occurs, this is likley caused by a bad/weak fuel pump