Author Topic: AFR problem  (Read 809 times)

Offline sergio_daq

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AFR problem
« on: July 12, 2012, 10:01:31 am »
Hi guys.

I fully rebuild my car. Engine, gearbox, transmissions etc etc.

Before this, the car was good, AFR ratio a little poor (work made in G-lader), so, after I finished the car, I upgraded the fuel pump, and change filter and pressure fuel valve. Even before I made this change, the AFR was already too poor. When I say too poor, I'm refering to values between 30 - 110 AFR! The ECU just can't put the AFR ratio right, it's to much unstable.

I already made all changes I remember, so, I don't know what can I do more.

I already change the next parts:
-Throttle body
-All the injection system
-Fuel pressure valve
-Water temperature sensor
-Air temperature sensor (CO2 potenciometer)
-"ralenti" valve
-Vacuum tubes
-ECU
-ECU cables
-Fuel pump
-Fuel filter

But the ECU still can't put the AFR right..
Any ideas?

Thanks for your attention.

Regards

Offline hayesey

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Re: AFR problem
« Reply #1 on: July 12, 2012, 11:01:16 am »
is the engine standard?  Does it have an aftermarket chip in the ECU?

I don't understand what you mean by "values between 30 - 110 AFR".  Values of what?  Surely you can't mean 30:1 - 110:1 ratios as that's mental, it surely wouldn't even start with such little fuel in it.

Is the AFR ever stable?  Does it stay stable at full-throttle?  Are you aware that at idle it is supposed to fluctuate?  At part throttle it'll move about a bit as the ECU reacts to the readings it's getting from the lambda.

What are you using to determine that the AFR isn't right?

Offline sergio_daq

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Re: AFR problem
« Reply #2 on: July 12, 2012, 08:39:24 pm »
Happens that I found a leak in the exhaust...
Only today.

Anyway, thanks for help.
And I'm using the LM2 device from innovate.