Thread: High Long Term Fuel Trims - why?

Originally Posted by benji

Your water temp on the pic being 85 is too cold. I know the GEMS system starts richening the mixture up at 87 to get the motor back to temperature.
Does it heat up to where it should be?

Thanks for this. The thor thermostat opens at 84, so on a cold day the engine coolant it may not get any warmer than this.

Originally Posted by glenhendry

This is a screen shot of my Torque app after about a 20km drive. As you can see my LTFTs are both up high and are staying there. They have been there for days. I believe that means that fuel is being added to the default fual map, and fuel consumption figures agree.

What I dont know is which sensor is out of true. No fault codes are being thrown. The minimum value on the MAF looks slightly low? I know the O2 sensors are good, and they are staying 0.0-0.8 for a long time, rarely getting to 0.9, which I believe they are supposed to.

If they MAF is reading low, would that result is less fuel injected and then a lean reading on the O2 sensor which causes the high LTFT? The MAF is only a few months old, and is genuine.

Note: she is running very well on all other accounts.

Which torque app do you use?

It's the Android app;

https://play.google.com/store/apps/d...owl.torquefree

I use it too & it's great

Thanks - just downloaded myself to a new level of geekery. Incredible. Bluetooth DIP II ordered. Just need to learn how not to scare myself interpreting the readings. Or more importantly, when I should take note.

Purchased the ELM couple of months back & now have the android tablet nice to know which app works well on P38 will put it all together
over the weekend if I get time.
Thanks Cannon

ps Cant help myself when it comes to Gadgets!

Hi

According to DashCommand on my iPhone i too have pretty high long term fuel trims.

I will be interested to see what happens to them after my service and tuneup.

Steve

Originally Posted by SteveFarmer

Hi

According to DashCommand on my iPhone i too have pretty high long term fuel trims.

I will be interested to see what happens to them after my service and tuneup.

Steve

Any change SteveFarmer? I still have this issue, and I suspect low fuel pump or inlet manifold gasket leak. I will be measuring the fuel pump output today.

For reference, the D2 Thor, both 4.0 and 4.6 cuts out cold fuelling at 55degC. Found this out when I was testing the Freelander 82deg thermostat and had consumption issues that turned out to be unrelated.