Freelander TD4 06 clicks, and misfires when pushing accelerator too quickly!

I've recently purchased a Freelander TD4 and I am hoping that somebody out there may have had and solved this issue in the past, as all my reading up on similar issues so far has led me to a dead end!

The previous owner explained to me that the MAF sensor needed replacing. Symptoms: when MAF plugged in, you push the accelerator, and its takes around 4 seconds for revs to reach past 2k. When MAF unplugged, revs act as normal and engine pulls as normal.....however when I push the accelerator too quickly, there is a loud clicking sound in the engine, followed by a misfire, followed by a huge plume of blue smoke out of the back.

After spending hours reading through the forums, I decided to replace the MAF/MAP and air intake sensor in the hope of solving this issue.

Turned the key after replacing all three, and the engine started as normal and revved as normal. Tried this about 5 minutes later and I was back to square one. Barely any response from the accelerator.

After tinkering about, I decided to pull the MAF from its housing - still connected, and started her again. Hey presto.

Now for the 1 million dollar question....why would the MAF function out of it's plastic housing, but not in?

Is this an air flow issue maybe? or some kind of electrical fault. This so far has been a dry Jan, but as I write this, after the messing about today, I already feel like reaching for a cold one!!

Any help or insight would be more than appreciated.

Yer would be betterer to ask questions about Freelanders int Freelander section over ere:

https://www.landyzone.co.uk/forum/land-rover-freelander.9/

I have reported this post for yer. The mods will move it to the Freelander section when they're back from the pub.

Welcome to the forum.

I'd be putting it on diagnostics - an 06 TD4 should be ODBII compliant so any cheap dongle should work. I'd be checking for air flow and pressure but also for low and high pressure fuel levels. There are figures on here on various threads that say what they should be.

There could be an intermittent problem completely unrelated to the parts you're testing - eg low pressure fuel pump, O ring in the injector pump pressure regulator or fuel rail pressure seonsor (harness).

A Diagnostics Data sticky would be good.

Fuel rail sensor or wiring would be a good place to start. Was the new MAF a genuine Bosch part? Cheap MAFs are generally junk tbh.

Thanks all. I guess I’ve fallen into the trap of assuming it’s a sensor fault. I’ll get it on the diagnostics this week and let you know how I get on. Cheers

Could also be a break in the MAF wiring or something nearby - think what you’re disturbing when getting to the MAF plug. Air filter box, which holds the rail sensor loom amongst other things, vac pipes...

It would be worth your while giving the various harnesses and pipes a wiggle to see if the fault recurs - MAF might be a red herring.