Gulp Valve

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ghoztdawg
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Gulp Valve

Post by ghoztdawg » Sun Oct 30, 2005 10:23 pm

My 80 Spider ran like crap until I clamped off the air hose to the gulp valve. Now it idles and runs great except for the backfiring problem that occurs if I really accelerate and then shift. I know that the gulp valve is designed to prevent this, but it evidently is allowing a vacuum leak that makes the engine idle rough and run rough at RPMs below 1800. Is there a way around this problem without replacing the hard to find gulp valve?
Thanks for any help-ghoztdawg

kevinboyd
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Joined: Wed Jul 06, 2005 5:55 pm
Location: USA

Post by kevinboyd » Wed Nov 02, 2005 6:56 pm

I disconnected the hose that connects to the intake manifold and then pluged it with a rubber stopper. As long as you don't have to pass an emmissions test, you should be ok. I had to do the same thing. My 79 Spider would not idle until I disconnected the hose. It's a huge vacuum leak.

Kevin W. Boyd
1979 Fiat Spider 2000

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ghoztdawg
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Post by ghoztdawg » Wed Nov 02, 2005 10:23 pm

Thanks-I'll certainly try your advice. If I don't remedy the backfiring I'll soon be replacing the muffler.
-ghoztdawg

mbouse
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Location: Coldwater, Michigan, USA

Post by mbouse » Thu Nov 03, 2005 2:09 pm

I used an oil drain plug w/ 18 mm threads, available for under $2 at Auto Zone to fill the hole left by the removed valve.

Looks a lot cleaner !!

Car runs great w/out the air pump draining the hp at the crank.

Mike Bouse
Coldwater, Michigan
1980 Fiat Spider, stock

kevinboyd
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Location: USA

Post by kevinboyd » Thu Nov 03, 2005 11:10 pm

I used the stopper and pushed it far enough inside the hose , so I could reconnect the hose to the gulp valve. It looks as though it's all in order.

Kevin W. Boyd
1979 Fiat Spider 2000

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ghoztdawg
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Post by ghoztdawg » Thu Nov 03, 2005 11:18 pm

I will definitely disconnect the air pump. I plugged the the air line connection at its exit port on the manifold, disconneted the electro valve and plugged the two vacuum lines going to it. That seems to have helped with the backfiring some; however, it still occurs primarily when shifting from 4th gear to 5th during high acceleration. I don't know what else to do to remedy this. Am I missing something?
Thanks for any response-
-ghoztdawg-
-1980 Fiat Spider-

mbouse
Posts: 1972
Joined: Mon Dec 20, 2004 10:26 am
Location: Coldwater, Michigan, USA

Post by mbouse » Fri Nov 04, 2005 1:46 pm

checked your timing lately?

Mike Bouse
Coldwater, Michigan
1980 Fiat Spider, stock

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ghoztdawg
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Post by ghoztdawg » Fri Nov 04, 2005 6:43 pm

I considered the timing, but I thought that would only have an effect on intake backfiring problems not exhaust. Nevertheless, it's certainly worth a try.
Thanks-
-ghoztdawg-
-1980 Fiat Spider-

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