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Discussion Starter #1
Dear Alfisti,

My '88 Spider has developed a 'jumpy' run when pushing it a bit on the first gear, like on a green light. It completely disappears as soon as I change to 2nd gear.

Had a very similar problem before and turned out that the black rubber hose running across the top of the engine head was not properly connected, so I checked that as well as for any cracks but could not find anything.
If anybody can share some knowledge on that I will appreciate it very much.

Cheers,
InBoccaAlLuppo
 

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What you experienced is false air, i.e. air entering the intake without being measured by the fuel injection system. Check all the hoses, even the rubber tubes that connect the plenum to the engine. Check that large intake hose first, they do work loose, usually at the AFM/air filter end. If this continues to happen (hose comming loose) check the engine mounts.
 

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Discussion Starter #3
Thank you very much, John. I will make sure to do that.

My spider is the same avorio color as yours, my favorite as it really highlights the body shape.
 

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Failing engine mounts can aggravate the problem. They let the engine move too much under torque which stresses the intake duct, can twist/bind the throttle rod, etc. When they get really bad the cooling fan can hit the shroud breaking both. When they get really, really bad the engine can move up enough to dent the hood!
 

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Discussion Starter #5
Eric, thank you very much for your input. I had some engine work done last year and the mounts were ok so I hope it is not so bad, but it is good to keep that in mind.

I am always amazed at the knowledge and speediness to answer in this forum, you guys rule!

Thanks again and cheers,
Marc
 

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Be careful of the advice from those who have black or red Spiders. While usually sound of mind, they operate under the delusion that those colors are faster.
 

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Discussion Starter #7
Ha, ha, ha!!!
That is hilarious!

Another related quick question: I noticed the car has been having a gas stink. is it possible that, due to the extra air coming into the engine, the mix does not burn properly and thus some gas is not burnt?
I was looking into that as a separate issue but then I thought it may have the same origin.

Thank you very much and a great weekend,
Marc
 

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Another related quick question: I noticed the car has been having a gas stink. is it possible that, due to the extra air coming into the engine, the mix does not burn properly and thus some gas is not burnt?
I was looking into that as a separate issue but then I thought it may have the same origin.
It's possible. If the leak is in one of the intake runners, for example, that cylinder will go lean. This will drive the mixture rich in the other three cylinders.

So be sure to check those runners. These are the four short tubes under the intake manifold that connect to the head, and they're a bad place to have an air leak.
 

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Well, gas fumes can be one (or both) of two possibilites - raw fuel vapors or rich mixture. There is a fuel vapor recovery system. If that isn't working right then vapors won't get recovered and you'll smell raw gas.

If there is too much fuel going into the engine then there'll be the smell of unburned fuel out the exhaust.

The 'fix' depends on the problem.
 

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Well, gas fumes can be one (or both) of two possibilites - raw fuel vapors or rich mixture. There is a fuel vapor recovery system. If that isn't working right then vapors won't get recovered and you'll smell raw gas.

If there is too much fuel going into the engine then there'll be the smell of unburned fuel out the exhaust.

The 'fix' depends on the problem.
Then, a lucid response.
 

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Discussion Starter #13
Thank you very much, guys. I really appreciate your advice.

Having your input and the BB's technical forum is very valuable to me.
I moved to South Korea a couple of years ago and, of course, brought the spider along.
But there is nobody here with Alfa Romeo expertise at all, so sometimes I get stuck.

Best regards,
Marc
 
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