Air flow meter - I know, bear with me

[rubjonny]

do you have any blows in the exhaust? mine popped when my 4branch wasnt sealed properly.  as above I'd be on the lookout down the scrappy for a 2.0 8v afm

[dadrathers]

OK RJ I will see if I can arrange an AFM swap to see if it cures - will it run Bodga if it is unplugged?? I am not sure what colour the plugs are but they were only renewed at end of October. How do I know if I am dribbling (it happens when you get to my age - lol)? No pinking and timing is spot on.

Excellent service on the forum as per.

[rubjonny]

no it wont run at all with the afm unplugged. to check the injectors need to have the rail off and in a container, but digis dont often suffer from this.  Injector rail can be a pin to remove so I'd leave that for now,i guess you could have a sniff for fuel with the plugs out, but hardly a conclusive test

[Ben Lessani]

Are you talking exhaust popping on deceleration or backfiring?

If its just popping on deceleration then its almost definitely a leaky exhaust/dead baffle.

[dadrathers]

As I say it is running so well otherwise. Ben, on straightforward decelertaion i.e. just lifting your foot off the go-faster pedal, it does NOT pop. It is only when I change down say from 4th to 3rd as I approach a roundabout for example. No backfiring just a pop, poppity!! (possibly even one more pop). It has always done it since I have had the car (nearly 3 years) although it is not on every change down. There are no other giveaways with the exhaust leaking - might be good idea to get the exhaust to manifold connection checked out by the experts.

Cheers.

[Alec]

Mine used to pop whilst engine braking or on the over-run when I had a longlife stainless with single silencer. It still does it now with a standard gti exhaust but not as much as it used to. Wouldnt worry about it matey

[Ben Lessani]

Sounds exactly like a damaged baffle or air leak.

When I had a straight through backbox (literally just a piece of straight tin pipe) it did the exact same thing.

[dadrathers]

So, Ben, is the air leak likely to be at the connection to the manifold? Or anywhere in the system? If it is a baffle then the only cure is to replace I guess? I am not worried about Sir Digby just being a bit of an anorak and trying ot get it as near perfect as poss.

[Alec]

I know what ya mean. Have a listen underneath the car and see if you can hear any farty noises 

[dadrathers]

Do farty noises in the car count??

It is quiet on tickover.