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 Backfire 
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Firing on two.
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Joined: February 17th, 2009, 8:43 pm
Posts: 485
Location: NOrWAY
Post Backfire
Hello Folks

The engine backfires up the carb, one of 5 times when hot starting.
It never backfires when cold. Valves adjusted and it has a DG-nition.

It's been doing this for 11000km. Doesn't get better, but doesn't get worse either. The engine runs great once started, hot and cold. The airfilter is in bad shape though, because of all the backfiring.

Something with the valves, even though they are checked? Only one exhaust valve needed a little adjusting. Intake valves was good.
Or may it be the DG-nition? Anyone had issues like this with an electronic ignition?

Regards Eirik

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Vennlig hilsen, Eirik
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Five 2CV's, DS 21 ieh Pallas -70, DS 23 h Pallas -75, CX 25 GTi automatic -89, XM 2,0i -90


January 17th, 2020, 8:41 am
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Firing on two.
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Joined: March 24th, 2009, 9:18 pm
Posts: 223
Location: 15340 Mourjou France
Post Re: Backfire
Never with 1-2-3, and I have it on all three vehicles (and the H-Van). Mostly because it's hard to find reliable condensors, and they always fail when it's raining or snowing or both....

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Dennis usually in the Cantal

1964 HY 72 (Type H, campervan)
1969 AZU 250 (formerly French Post Office van)
1982 Red Special
1983 Burgundy/Black Charleston
2017 Skoda Octavia Estate 1.4 DSG


January 18th, 2020, 2:01 pm
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Firing on two.
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Joined: March 21st, 2013, 12:04 am
Posts: 937
Location: Exeter, Devon
Post Re: Backfire
Greetings :D

Possibly electrical, in that a connection is expanding when warm and causing a bad contact.

Probably running weak when hot. Poor condition air filter won't help. Also check air filter unit isn't rattling around in the air box.

Check float height and test for air leaks at carb and cylinder head.

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If you can't fix it with a hammer, it's probably electrical (or, an electric fuel pump!) ....


January 18th, 2020, 3:13 pm
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Firing on two.
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Joined: February 17th, 2009, 8:43 pm
Posts: 485
Location: NOrWAY
Post Re: Backfire
Thanks guys. I have been thinking it might be the ignition unit, but maybe it is a weak mixture. I don't think there's any leaks at the manifold but I'll check. I'll have a look at the carburettor too.

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Vennlig hilsen, Eirik
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Five 2CV's, DS 21 ieh Pallas -70, DS 23 h Pallas -75, CX 25 GTi automatic -89, XM 2,0i -90


January 21st, 2020, 7:15 am
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