08-14-2018, 03:14 PM | #1 |
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Back fire
Probably a simple answer ? What is causing my engine to backfire through the carburetor . Newly installed dist. and not wanting to mess with setting.
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08-14-2018, 03:16 PM | #2 |
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Re: Back fire
Need more info??? What engine and what distributor.......????
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08-14-2018, 03:21 PM | #3 |
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Re: Back fire
Could be a stuck valve or a lean condition or...
More info as suggested. |
08-14-2018, 03:31 PM | #4 |
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Re: Back fire
newly installe ddistributor?? if early style, wrong firing order, if late style 180 out or wrong firing order...
and an entire list of others but those two are the most common. |
08-14-2018, 03:45 PM | #5 |
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Re: Back fire
Check that you reconnected the spark plug wires correctly after you installed the distributor....
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08-14-2018, 04:44 PM | #6 |
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Re: Back fire
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08-15-2018, 10:14 AM | #7 |
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Re: Back fire
Still wrong. Went down and checked the crab cap to see if I missed anything with the wires and found nothing . Someone suggested you may be 180 0ff ? Not likely to happen without breaking the housing when tightening bolts. Idles quite smooth, but still popping back for whatever reason ? I'll bet this is a fun truck to drive if it ever runs right !
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08-15-2018, 10:52 AM | #8 | |
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Re: Back fire
Quote:
why was the distributor replaced? run fine before that?? stuck intake valve bad coil/condensor |
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08-15-2018, 11:15 AM | #9 |
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Re: Back fire
Pretty badly worn and time for a do over. That is why it got reworked.
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08-15-2018, 12:15 PM | #10 |
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Re: Back fire
Try a different condenser.
Also do a compression check to see if a intake valve is hanging up. Or better... put a vacuum gauge on it to get a reading. |
08-16-2018, 04:11 PM | #11 |
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Re: Back fire
Many, if not most, backfiring is caused by a vacuum leak. Check the carb base gasket, and any hoses or taps on the intake manifold. It may be due to a breached intake manifold gasket or a warped gasket surface on the manifold itself. The above suggestion to try a manifold vacuum gauge is a good one.
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08-22-2018, 12:06 PM | #12 |
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Re: Back fire
Getting closer to being a street rod with a small block by the minute ! Two plugs (drivers side #1 and pass. side #3) are not firing,new dist rebuild, two new caps,different plugs, blue spark jumping a good 3/8 " even to my finger and block. Idles great on six cyl. Is it maybe time to change over to GM's 8-6-4 system when not needing full power ? This is a real head scratcher. Anybody on here want to make a paid house call ? Frustrated to say the least.
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08-22-2018, 12:38 PM | #13 |
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Re: Back fire
Check the compression on those two cylinders
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08-22-2018, 01:09 PM | #14 |
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Re: Back fire
Compression is better than 100 lb. all 8 cyl.
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08-22-2018, 01:16 PM | #15 |
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Re: Back fire
Vac line to the crab advance?
Bruce
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Works good Lasts long time Last edited by cmbrucew; 08-22-2018 at 03:43 PM. |
08-22-2018, 01:28 PM | #16 |
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Re: Back fire
something amiss here:
! Two plugs (drivers side #1 and pass. side #3) are not firing,new dist rebuild, #1 is not on drivers side. |
08-22-2018, 01:54 PM | #17 |
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Re: Back fire
From the driver's seat it is. I know on the cap it is the second one down on the left viewed from the front.
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08-22-2018, 02:35 PM | #18 |
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Re: Back fire
Bob ,
Feel free to ship me that distributor ( and cap etc) , will check and return the day i receive it . ( no charge). Might make ya feel better ????? |
08-22-2018, 02:55 PM | #19 |
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Re: Back fire
No blame directed at you Jim, I think what you did is fine. Just a quick question though, is the little rubber (gasket) on back around the brass plug of the dissy important to seal the vacuum line from leaks ?
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08-22-2018, 03:10 PM | #20 |
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Re: Back fire
On the crab the wires cross over ,# 1 on is the left and #5on the right facing the Radiator ,do a compression check ,could be blocked idol jets
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