S111 2 1/4 engine 'popping' on deceleration

I had the same problem with mine. I noticed that with a quick tap of the throttle it stopped for a few seconds. I increased the idle speed slightly as it was a bit low anyway and all is now fine.

I don't know if I have cured the problem or the symptoms but it worked for me.

S3 109 Petrol

Seconded. Most likely on the flange connection, but just maybe on the head-manifold gasket. Try dropping the front pipe of the manifold and resealing it with a new gasket first.

on the overun making the popping. steve the grease

Hi all,

Just returned from holiday towing a trailer tent for the first time. S111,

When going down hill the engine started 'popping'. Only happens on deceleration and engine breaking. Never noticed this on local running (ie without the trailer). Seemed to be from the engine rather than the baxk end of the exhaust.

Is this due to incorrect timing ? What should I do, advance the timing ??

Otherwise all well - 23.6 MPG !!!

Thanks

Andrew

Cheers Guys!

My S3 has been popping on over-run since I did an engine swap last weekend. I assumed it was a timing advance/retard problem with the replacement dissi', but couldn't find anything wrong. I'll try re-sealing the down pipe onto the manifold and see if that stops the noise.

Thanks again,

Neil.

As a general rule of thumb it would be timing/air/fuel in any combination. Have you strobed it up? and is the auto advance/retard springs ok? and weights working correctly? contact plate not seated correctly? No air leaks and or fuel getting through on the overrun? air/fuel mixture correct? asuming you've checked all else. Dave

manifold and works ok now problem was the exhaust to manifold joint one of the bolts had snapped .

Adrian Ford

its running lean. richen up the idle mixture