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Joined: Apr 2011
Posts: 77
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Apr 2011
Posts: 77 |
Before I road tested my vehicle I had it tuned,adj.tappets,new points, new plugs.
When I decelerate,ie. lift my foot off the gas the engine backfires several times.
It does not happen all the time, but frequently.
Any ideas?
Regards,
John.
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Joined: Feb 2011
Posts: 292
Backyard Mechanic
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Backyard Mechanic
Joined: Feb 2011
Posts: 292 |
did you change the condenser they some times are at fault and cause back fire.
Al
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Joined: Apr 2011
Posts: 77
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Apr 2011
Posts: 77 |
Hi Al,
No I think he thought it was a bit tricky with the electrolock.
I do have one, is there anything tricky about replacing it .
Regards,
John
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Joined: Sep 2005
Posts: 558
Oil Can Mechanic
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Oil Can Mechanic
Joined: Sep 2005
Posts: 558 |
Hi John,
The idle mixture may be too lean. Try enriching the idle mixture by turning the idle screw in a bit.
Happy Motoring,
Dan
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Joined: Jul 2002
Posts: 205
Backyard Mechanic
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Backyard Mechanic
Joined: Jul 2002
Posts: 205 |
might be a slight vacuum leak
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Joined: Feb 2011
Posts: 3,136
ChatMaster - 3,000
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ChatMaster - 3,000
Joined: Feb 2011
Posts: 3,136 |
I once had my timing to far advanced and it would do that...
1947 Fleetmaster Sport Coupe VCCA # 47475
If it's not wearing a Bowtie...It's not properly dressed...!
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Joined: Feb 2011
Posts: 292
Backyard Mechanic
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Backyard Mechanic
Joined: Feb 2011
Posts: 292 |
Not really just have to be careful.
Al
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Joined: Nov 2002
Posts: 7,472 Likes: 26
ChatMaster - 7,000
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ChatMaster - 7,000
Joined: Nov 2002
Posts: 7,472 Likes: 26 |
If it backfires thru the exhaust system you may have a leak at the connection of the exh. pipe to the manifold.When you decellarate it will draw in a little air (oxygen) and combined with the unburned fuel give you the backfire.
Steve D
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Joined: Dec 2007
Posts: 255
Backyard Mechanic
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Backyard Mechanic
Joined: Dec 2007
Posts: 255 |
 This is a very common cause of backfire. If there is a manifold leak or exhaust pipe leak close to the valves it will back fire and quite impressively at that!!! 
Those who would give up essential liberty to purchase a little temporary safety deserve neither liberty nor safety. B.F.
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Joined: Apr 2011
Posts: 77
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Apr 2011
Posts: 77 |
Thanks guys,
I have changed the condenser.
I soaped up the doughnut at the exhaust/manifold connection and noticed there was a small leak, hope this is source of the prob, will test drive in a couple of days.
Thanks,
Regards,
John
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Joined: Apr 2011
Posts: 77
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Apr 2011
Posts: 77 |
Those couple of things seem to have solved problem.
Thanks.
Regards,
John
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