Performance drops after 2000rpm

[Acoris]

Hi all,
Its me again.
I'm going crazy as I couldn't find the reason;
The engine sounds like a vacuum cleaner after 2000rpm and doesn't accelerate as it used to. I thought it was because of the exhaust leak, we change the exhaust but its still not as we first bought.
It is not like stalling or something, it just accelerates slowly, or in other words i feel less tork. There is no problem with the final speed, it can go up to 150-160km per hour, just the acceleration. Where should I check?
Its not fun to drive like it used to.
Thank you for your valuable time.
Best

 

[Ihtisham Rauf]

Air filter? Some blockage in the intake pipe?

 

[frank]

has it got an aftermarket intake ? they can give bad flatspots
and you can monitor the lamba signal to check for leaning out (the voltage of the middle wire, or with obd software)

 

[Acoris]

has it got an aftermarket intake ? they can give bad flatspots
and you can monitor the lamba signal to check for leaning out (the voltage of the middle wire, or with obd software)

Hi Frank,
This is when motor is warm and at idle.

 

[frank]

you need to check it while driving ideally

 

[Acoris]

you need to check it while driving ideally

Its nearly same (i mean lambdas). I know that second one should be more stable. I just dont want to buy lambda unnecessary. How can i know if its broken?

 

[frank]

this is how my precoilpack was when running well, the 1st lambda is the key one

Grr

Right I fitted a 1.3 into my 1.0 and it didn't run right so I put the 1.0 tb and dizzy on it and run ran fine Now it is over fuelling running rich i mean i done 1/4 of a tank in 40 miles :( really smells of fuel also misfiring like a pig when idleing revs drop right down but don't cut out Thanks

www.micra.org.uk

 

[Acoris]

this is how my precoilpack was when running well, the 1st lambda is the key one

Grr

Right I fitted a 1.3 into my 1.0 and it didn't run right so I put the 1.0 tb and dizzy on it and run ran fine Now it is over fuelling running rich i mean i done 1/4 of a tank in 40 miles :( really smells of fuel also misfiring like a pig when idleing revs drop right down but don't cut out Thanks

www.micra.org.uk

Great Frank. You are like a guru.
What is lift? You wrote it should be zero at lift.
I will ride and check with obd. I think i have greater up and downs.

 

[frank]

lifting the accelerator mate

 

[Acoris]

lifting the accelerator mate

Sorry I’m total newbei.
do you mean not pressing gas pedal?

 

[frank]

yes

 

[Acoris]

yes

Ah then i can say it never goes to zero. Always up and downs. Does it mean that lambda needs replacement?

 

[frank]

i doubt if its faulty, the coilpack ecu may be programmed different
my toyota iq has factory wideband lambda and reads 16:1 at idle and lift iirc

 

[Ihtisham Rauf]

View attachment 67586

Hi Frank,
This is when motor is warm and at idle.

What are you using to get this data? I forgot!

 

[Acoris]

What are you using to get this data? I forgot!

Torque app

 

[Acoris]

i doubt if its faulty, the coilpack ecu may be programmed different
my toyota iq has factory wideband lambda and reads 16:1 at idle and lift iirc

Hi Frank
I recorded 2 videos;
Take off and acceleration

Driving


Also the code

 

[frank]

looks like its closed looping ok eh, and no acceleration enrichment

 

[Acoris]

looks like its closed looping ok eh, and no acceleration enrichment

which means? Where is the problem i mean?

 

[frank]

has it got an aftermarket intake ? they can give bad flatspots
and you can monitor the lamba signal to check for leaning out (the voltage of the middle wire, or with obd software)

means the fueling looks ok to me, if it was going lean on acceleration then i would say filter or fuel pressure

 

[Acoris]

My fuel consumptian is around 9LT per 100km. It was around 6LT per 100km.

 

[.Maarten]

Check the MAF. They are quite common to fail

 

[Acoris]

Check the MAF. They are quite common to fail

I found a video in internet how to check MAF. It says if you take out the power cable while the car is running and if the car stops. Then MAF is working. I did it and the car stopped.
But anyway, I found a second hand original MAF and bought it for 25 Euro. It is arriving tomorrow. Hopefully it will fix the problem.
I never cleaned the intake manifold. I didn't know that it is something cleanable. I will try to clean it this weekend.