Confirm poor idle and low rpm conditions?

[Gary S.]

Re: Confirm poor idle and low rpm conditions?

I got back this afternoon after a chapter Tech session (first one in YEARS because of my job) so I haven't checked anything. While driving, the car ran very well. With a slightly increased idle, it was smoother off the line. I hooked the TCS back up using a diagram provided by the good doctor via Patrick and it seemed to make a difference. I have not checked the power valve nor any of the vacuum related items.

Right now, I am checking out significant gas smells even with the gas level at less than 1/4 and reading from the Search function. The smell is enough that two members approached me at the meet and asked if I knew where it was coming from. Everything is only hold while I investigate the vapor canister and the fuel vapor doohickey on the tank. No visible leaks, btw. Stay tuned.

[Terry M.]

Re: Confirm poor idle and low rpm conditions?

I got back this afternoon after a chapter Tech session (first one in YEARS because of my job) so I haven't checked anything. While driving, the car ran very well. With a slightly increased idle, it was smoother off the line. I hooked the TCS back up using a diagram provided by the good doctor via Patrick and it seemed to make a difference. I have not checked the power valve nor any of the vacuum related items.

Right now, I am checking out significant gas smells even with the gas level at less than 1/4 and reading from the Search function. The smell is enough that two members approached me at the meet and asked if I knew where it was coming from. Everything is only hold while I investigate the vapor canister and the fuel vapor doohickey on the tank. No visible leaks, btw. Stay tuned.

It is pretty common for the fuel vapor doohickey on the tank (known in some circles as a vapor separator) to crack with age and begin to leak. Its function is to separate liquid fuel from vapors. With enough fuel in the tank liquid will leak from fuel vapor doohickey onto the driver's side muffler. It is possible for bad things to result from that. The doohickey is hard to see, but I would encourage you to do your best to inspect it. There is a reproduction available from all the usual suspects.

[Patrick H.]

Re: Confirm poor idle and low rpm conditions?

It is pretty common for the fuel vapor doohickey on the tank (known in some circles as a vapor separator) to crack with age and begin to leak. Its function is to separate liquid fuel from vapors. With enough fuel in the tank liquid will leak from fuel vapor doohickey onto the driver's side muffler. It is possible for bad things to result from that. The doohickey is hard to see, but I would encourage you to do your best to inspect it. There is a reproduction available from all the usual suspects.

Gary and I talked about that yesterday too. As he's already had a crack in it I'd say it is high on his list of suspects.

[Gary S.]

Re: Confirm poor idle and low rpm conditions?

I will be dropping the spare tire tub this morning and pulling out the vapor separator as well as checking out the rubber fuel lines that I can see. Searching here gives lots of possibilities for fuel smell but many are eliminated because I came home with less than 3 to 4 gallons of fuel. That eliminates fuel sloshing out the neck to tank seal and other areas. Since the smell is only there after driving, it must be related to fuel delivery or usage.

Thanks for the advice. I will continue to address one problem at a time.

Gary

[Duke W.]

Re: Confirm poor idle and low rpm conditions?

Check all the hoses that connect the various pipes on the evap system between the tank, carb, and cannister. If one cracks you will definitely get fuel smell. Replace any deteriorated hoses with SAE 30R7 hose. Given age, all should probably be replaced.

Duke