A4 2.0 Auto Petrol "Hunting Issue"

[Ski_haggis]

Hi,

I have had this problem since buying this A4 but after one garage saying it was MAF sensor and replaing that and another garage finding 2 leaks in pipes and fixing them the problem is still there. NEED HELP!

Only just found out yesterday that this can be called "Hunting".

Only when warm and only between 1-2k revs there is a "hunting" "little rev" issue every 2-3 seconds. More noticeable when driving up hill and doesn't do it if you're in neutral.

Some help and suggestion would be great as I want to put it right asap.

Many Thanks in advance

Ski

[Ski_haggis]

anyone?

[drpellypo]

When your Maf was replaced was it from main dealer?

[Ski_haggis]

When your Maf was replaced was it from main dealer?

No. Just bought replacement and got it fitted.

[drpellypo]

I meant was the part an OEM one, or a cheaper alternative? I say this because if it was the latter it might still be a maf issue. I wouldn't rule that out until you had a genuine Bosch maf fitted.

[Ski_haggis]

It was an original Bosch.
Also I was told by someone after I changed it that it was stupid to do so as it can't be the Maf for some reason.
Before changing it I unplugged it and drove the car. The car drove just the same which made me believe that it was the cause but again I was told no that means it's not that.
Why do you think it's the Maf?

[drpellypo]

Because what you describe matches perfectly with elsawin's description of symptoms of a faulty maf. But if you've changed it for a genuine one, it's obviously not that. I'm out of ideas! Hopefully someone more knowledgable than me will be along soon

[Sam]

Faulty coolant temperature sensor = hunting idle.

A code read would help to diagnose any other issues.

[Ski_haggis]

It's not hunting on idle. Only whilst driving under load between 1-2k revs.
Is this still a possibility as I've noticed my temp gauge has been all over the place lately?

[Sam]

Does it drive as if (if it had one!) you'd forgotten to put the choke in?

Does it stutter/judder when you let off the accelerator?

Does the temp gauge climb/fall as your altitude changes?

Without getting the car scanned for faults, you're clutching at ideas, but to me, it sounds like the temperature sensor or stat.