Hesitation while acceleration, short term and long term fuel

FAHAD ANWAR

MEMBER
2011 DAIHATSU MOVE
0.6L
3 CYL
2WD
AUTOMATIC
132,000 MILES

I have a hesitation while acceleration. Can you please check the o2 and fuel term reading in a video? Is there any abnormality? There video is while I am driving 0to100km/h.
In morning it take just a little more cranking to start in this car have eco idle function.

Video (Click to make bigger)

7 Replies

ASEMASTER6371

MECHANIC
52,797 POSTS

Good morning,

The readings look good. The long term is the key. It should be close to 0. It may roam around 0 plus or minus about 3%.

I would check the fuel pressure. The pump may be draining down overnight losing its prime.

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

https://www.2carpros.com/articles/how-to-replace-an-electric-fuel-pump

Roy

SPONSORED LINKS

Was this

answer

helpful?

Yes

Friday, November 6th, 2020 AT 4:20 AM

FAHAD ANWAR

MEMBER
10 POSTS

How to check this type of fuel pressure regulator? It does not have any vacuum connection. And yes fuel pump does not hold pressure. Can a one way valve can do some? And at idle ltft stays -4.7 and sometimes -6.0. If fuel pressure isn't good then my ltft should be positive I guess.

Image (Click to make bigger)

Was this

answer

helpful?

Yes

Wednesday, November 11th, 2020 AT 11:16 PM

ASEMASTER6371

MECHANIC
52,797 POSTS

Okay, if the fuel pressure drops off, it could be either one of the injectors leaking down bleeding off the fuel pressure or it could be the check valve in the pump itself.

The injector rail off as in the picture you see, pressure up the pump with the key on and see if any of the injectors are leaking fuel.

Roy

Was this

answer

helpful?

Yes

Thursday, November 12th, 2020 AT 1:20 AM

FAHAD ANWAR