SanDiego928

I will contact you if I get into a pickle on this. That is very thoughtful of you to offer your time and assistance. This forum reminds me of the Yamaha FJR forum. So many people willing to help. I am off on an off-road trip this weekend at the Salton Sea and the 928 is not my daily driver so I have some time to mull this over. Thanks very much.

SanDiego928

For the past month I have spent some weekends working on the 928. I have found a few vacuum leaks and the decel valve was just barely hanging on. Idle is more stable now and I feel rather good about doing this myself. Also this month I needed to replace the return power steering hose since it was not routed correctly and was brushing against another hose and wore a hole in it.
Yesterday found 2 gas leaks, 1 at the fuel pump (need new copper washers) and one above but need to drop the tank for that one. I am getting a huge education working on this car. I wanted to post my progress and feelings thus far. The 928 is everything, everyone says it is.........including the maintenance and I understand what a project car is now. I am as happy as a pig in slop as the saying goes. I am still a newbie but I am learning. Thanks for all the responses to my posts.

James Bailey

The fuel leak on top of the tank may be around the level sender. You can access it from inside the car. Lift the carpet locate the plastic disc and pop it up. You are then looking at the sender and fuel return line. The large outer nut unscrews. Also note if anyone has mounted speakers or amps to the deck they easily may have drilled holes in the plastic tank....

SanDiego928

I am going to use these factory caps as suggested - Great idea to pass visual. Thanks.

Randy V

I deleted the decel valve from my previous '79.

Resulted in much improved throttle response and no negative effects.

SanDiego928

Thank you so much James. I would not have looked for an opening there without this precious piece of advice.

SanDiego928

Well then, that is what I am going to do. Thanks Randy. 928 intl does not carry the plugs but Pelican Parts does so ordering them tonight. I was a little hesitant to do this but this cinches it for me.

SanDiego928

Exactly correct. Return line was original and started to fall apart just unhooking it. 2 gas leaks fixed and I am feeling good. Next issue - delete decel valve.......

hacker-pschorr

High vacuum is also a great way to suck oil past valve guides / seals.

General rule of thumb, if you don't know if the guides / seals have been replaced in your car, they are probably original.

There was most likely something wrong with the valve itself or something else was broken / leaking and removing the valve inadvertently fixed or masked the real problem.

The valve is only supposed to be open at very high vacuum conditions under decel. At 16-17 inHg the valve closes.

It's currently disabled on my 81 (with EuroS brains) and the "glass-pack" pick-up truck deceleration pop is getting annoying. Unlike with L-Jet, I cannot simply remove the idle switch unless I feel like changing both LH & EZK maps to control idle without the idle maps in play. Not a big deal but I fail to see the advantage.

SanDiego928

I deleted the decel valve tonight and replaced with the caps as mentioned in this thread.

I was in there already fixing coolant leaks in the back and decided to give it a try.

I hope this works out okay. The parts guru at oops, it was Pelican Parts and that guru said it was okay to delete decel since he also did it.

Randy V

They hired JB back?

SanDiego928

Sorry dont remember his name. Was back in April late April. I checked and it was Pelican Parts. intl. did not have them at the time. my bad