[Davebeiler]

1981 911sc-Long post alert and a Newbie to the CIS system.

Never had an issue with backfire up until yesterday. After car sitting for only 2days, On cold start I got 1 immediate loud backfire and then the engine would only crank and not turn over. I immediately inspected the air box and confirmed the pop-up valve has “popped off.” Another words instead of the flap just opening there was enough force to break the adhesive securing the valve to the airbox and it was just sitting inside under the filter. I never had an issue with backfire or my air box/valve for the 5 years I’ve owned this car until now and no visible cracks upon inspection of the airbox.

My question is can I clean the the area around the hole for the valve and reinstall it? since there’s no other cracks in the airbox or valve itself? Or should I look into a whole new airbox/maintenance that comes with that project. The 2” hole for the valve is perfectly intact just the adhesive gave way allowing it to pop off from the airbox as mentioned before.

Thanks for anyone’s help with this.