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Oh Dear, engine is backfiring...
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72VWSB Premium Member
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PostPosted: Tue Feb 18, 2020 7:35 am    Post subject: Oh Dear, engine is backfiring... Reply with quote

Been working on my 72 VW SB, new inside carpet, upholstery, padded dash. No seats but have a milk crate, took car for a spin and noticed it backfiring...I've done no changes to the engine but of course I have wires all over the place in the dash because I'm waiting for vents for my new dash pad. Can't see this causing backfiring but perhaps I'll take a drive again when I get the dash back in and wires connected...jeesh!
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vwoldbug
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PostPosted: Tue Feb 18, 2020 12:43 pm    Post subject: Re: Oh Dear, engine is backfiring... Reply with quote

If it backfires on deceleration it's probably an exhaust leak.
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PostPosted: Tue Feb 18, 2020 12:54 pm    Post subject: Re: Oh Dear, engine is backfiring... Reply with quote

Idles fine, doesn't backfire on deceleration...only on acceleration... I did find some loose wires to the distributor...we'll see if that fixes it.
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PostPosted: Tue Feb 18, 2020 2:42 pm    Post subject: Re: Oh Dear, engine is backfiring... Reply with quote

Check the points!
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PostPosted: Tue Feb 18, 2020 2:57 pm    Post subject: Re: Oh Dear, engine is backfiring... Reply with quote

X2, check the point gap and then the timing. I have seen points slip out of adjustment, causing those symptoms. There is supposed to be a 4 mm inner diameter flat washer and toothed washer (toothed one on top) under the screw that holds down the points.
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Tim Donahoe
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PostPosted: Tue Feb 18, 2020 3:35 pm    Post subject: Re: Oh Dear, engine is backfiring... Reply with quote

Iíve also found a bum condenser can cause backfiring.

Tim
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PostPosted: Tue Feb 18, 2020 6:29 pm    Post subject: Re: Oh Dear, engine is backfiring... Reply with quote

Ok, discovered my problem or not...lol. I called my son, he built my motor...I'm running a Delorto 40 single carb. Sorry I didn't add that when posting! I also have the petronix flame thrower distributor. Seeing as the backfire was below about 3000 rpm, he suggested I take out the idle jets, blow them out which I did. Car ran fine after that! Delortos run on idle circuit till about 3000 rpm.
Must have been a little dirt in there, have a good gas filter on the bug...
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