Exhaust fumes - Alfa Romeo Bulletin Board & Forums
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post #1 of 16 (permalink) Old 06-22-2019, 05:57 PM Thread Starter
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Exhaust fumes

New member new to area have heard this is common problem but haven't heard of definitive solutions and don't know which forum to post to - 89spider getting exhaust fumes in cabin when driving top up or down have just finished engine / trains rebuild and paint- can't find any openings under car -second spider never had this prob with 87 spider - 89 has always done this - read factory bulletin about tailpipe have stinger on and no difference it is shorter than stock pipe - any ideas ?
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post #2 of 16 (permalink) Old 06-23-2019, 05:04 AM
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I have a new magnaflow exhaust on my '74 Spider. The tailpipe is straight. However, it is probably longer than most, extending 8.5" from the body app. 5.75" from the rear bumper. I have not had any issues with exhaust gas. Is it because of the length of the pipe? I don't know. I would check for exhaust leakage from all exhaust manifold gaskets as well as for manifold cracks.

Joe G.
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post #3 of 16 (permalink) Old 06-23-2019, 10:33 AM Thread Starter
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Exhaust is good all new except manifold - good no cracks - I've been told body change with spoiler is problem on spiders - tailpipe on my 87 stuck out good ways and never had this- centerline pipe barely reaches bumper and has slight upturn - wish I had a wind tunnel ! Someone posted factory bulletin about not shorting pipe - just wanted to know if anyone else had this prob and found solution before I start cutting pipe to extend it
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post #4 of 16 (permalink) Old 06-23-2019, 11:25 AM
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My tailpipe only sticks out approx. 3 inches past body skirt cut out. Never had an exhaust fume problem. Maybe there is a "window" of length that that catches the air flow just right to bring it back into the car.
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post #5 of 16 (permalink) Old 06-24-2019, 10:49 AM Thread Starter
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That's what I was thinking and wondered if anyone found that window before I start cutting and guessing
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post #6 of 16 (permalink) Old 06-24-2019, 10:52 AM Thread Starter
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Saw old posts about same issue but never any real definitive solutions
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post #7 of 16 (permalink) Old 06-24-2019, 11:07 AM
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You sure your mixture is right? An EFI car shouldn't have much exhaust smell to start with.

I'd measure voltage output from your oxygen sensor, make sure the car isn't running rich.

Tom

1963 Giulia Spider (1750 engine)
1974 GTV
1991 Spider
Former: 1987 Milano Gold
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post #8 of 16 (permalink) Old 06-24-2019, 11:39 AM
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I suggest you replace the hood seal, the rubber seal strip along the back edge of the hood.

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post #9 of 16 (permalink) Old 06-24-2019, 11:57 AM
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Quote:
Originally Posted by Mauricedean View Post
That's what I was thinking and wondered if anyone found that window before I start cutting and guessing
I'm not sure what you're cure might be but Gubi does make a good point. If you find your mixture is correct maybe get a scalloped stinger and try directing exhaust in different directions? Like I said, my straight pipe ends under the bumper and I never even get a whiff of exhaust.
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post #10 of 16 (permalink) Old 06-25-2019, 04:15 PM Thread Starter
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Good thing I can smell them - bad that I am breathing them- mixture is good runs great entire rev range - plug readings look good ( old school tuner ) I think it's aerodynamic problem - don't want to extend pipe too far out and look strange - have done every thing can think of checked trunk taillight gaskets etc -- thanks for input every one - you never know when someone else might think of something I missed
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post #11 of 16 (permalink) Old 06-25-2019, 04:19 PM Thread Starter
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Centerline stinger pipe doesn't make it to bumper but stock muffler wasn't much longer and still same problem - put straight pipe on to reduce back pressure and possibly speakup gas flow out pipe to get away from car quicker but didn't help
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post #12 of 16 (permalink) Old 06-25-2019, 04:33 PM
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Contrary to some popular beliefs, in this instance I am not sure longer is necessarily better. I do know if an 89 has the same spoiler/bumper/aerodynamics of an 86, but like I said, mine is really short( my exhaust) and fumes are not an issue. I am not sure anybody is going to be able to give you a definitive answer on this one.....
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post #13 of 16 (permalink) Old 06-25-2019, 08:05 PM
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I was told that the end of the tail pipe must have a down turn.


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post #14 of 16 (permalink) Old 06-27-2019, 04:24 PM
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I had this problem in spades. My clothing would reek of tail pipe fumes. My car is a 69 spider and my mechanical fuel injection was the culprit. Even though the car functioned perfectly there was wear that created tail pipe mixture poison. I replaced the spice pump and had it set up perfectly and the heavy smelly tail pipe problem went away. FYI I tried all the sealing and plugging ideas none worked
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post #15 of 16 (permalink) Old 06-27-2019, 08:57 PM
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I asked this same question when I started driving my 78 spider. I could also smell gas driving top up or down. The trunk smelled of gas and my garage as well after driving. There is a very well done You tube video addressing checking the sending unit in the gas tank for leaking seals. I never went that far because I found a leaking, cracked hose in the trunk. Replaced it with compression tubing and no more fumes. Here's a picture. I don't know the real name of the part but the plastic connector needs to be in an upright position.
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