exhaust vacuum pipe

I wish I could provide some insight. I've been considering doing the same but may hold off until someone weighs in. Hopefully someone who has done this mod will reply.

 

Are you 100% sure the vacuum hose is airtight where you plugged it? Unmetered air getting into the intake system can play havoc with the fuelling and can cause idling problems.

 

Personally, I wouldn’t use those, they are dust covers, at best. I plug flexible vac hoses by sticking an appropriate diameter bolt in there and using a zip tie on the flexible hose to squeeze the rubber down onto the bolt.

 

Agree. I only used the caps on the nipple coming off the valve. I used a small bolt and a small clamp on the hose itself to ensure an airtight seal. I then zip tied the hose up and out of the way. I have never had an issue.

 

You’re probably right and it’s probably sealed. But you’re getting good advice — vacuum lines get plugged not capped, always. This will eliminate this potential cause for your idle problem. (As will reconnecting the line to the exhaust valve as a test, I say at the risk of sounding like captain obvious!)

 

You’re welcome