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Backfire through exhaust after key off 120-130

posted by  someone claiming to be Nozzaamazon on  Tue Mar 16 09:55 CST 2010 [RELATED]

If I go out for a run and get the car up to temp then stop and turn the ignition off I get a rtaher embarrasing bang out the exhaust anything up to a few seconds after switching off.

If I purposly stall the car I can avoid the backfire.

I have a B18 with twin SU's.

Thoughts are -
Worn exhaust valve
Air leak in spindles of carb,or from brake servo
Carb fault
Ignition fault.

any ideas what to check first?

Thanks






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