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1. Backfire (score: 1): Author: RETWIZBANG@aol.com; Date: Mon, 28 Aug 2000 09:53:56 EDT; I've been patiently trying to get a 1969 MGB to run for about a month. So far, I have cleaned and sealed the gas tank, installed all new fuel hoses, filter, tune-up, and I switched the Weber which ca; /html/mgs/2000-08/msg01589.html (7,025 bytes)
2. Re: Backfire (score: 1): Author: Tab Julius <tab@penworks.com>; Date: Mon, 28 Aug 2000 09:57:08 -0400; Is the timing set properly?; /html/mgs/2000-08/msg01590.html (7,311 bytes)
3. RE: Backfire (score: 1): Author: Gordon Bird <gb@the-bdc.com>; Date: Mon, 28 Aug 2000 10:55:13 -0400; Agree with Tab to double check your timing. Also, is your vacuum advance; /html/mgs/2000-08/msg01593.html (7,510 bytes)
4. Re: Backfire (score: 1): Author: Ajhsys@aol.com; Date: Mon, 28 Aug 2000 13:07:16 EDT; << I have the same symptoms as before - BACKFIRE - through the exhaust and carbs. The car idles fine, but as soon as I rev, it backfires like crazy >> - - - - - - - - - - - - - - - It could also be v; /html/mgs/2000-08/msg01600.html (7,145 bytes)
5. Re: Backfire (score: 1): Author: David Ambrose <stargazer1@home.com>; Date: Mon, 28 Aug 2000 10:31:40 -0700; Does you '69 still have its emission controls? If so, I would check the glup valve on the intake manifold, air pump, and the check valve on the air injection manifold. If necessary, the original gulp; /html/mgs/2000-08/msg01602.html (7,602 bytes)
6. Re: Backfire (score: 1): Author: Max Heim <mvheim@studiolimage.com>; Date: Mon, 28 Aug 2000 10:40:37 -0700; Have you confirmed that the spark plug wires are attached in the correct firing order, and all are functioning? It might idle on 3 cylinders, but revving it floods the exhaust with fuel. Just a guess; /html/mgs/2000-08/msg01603.html (7,598 bytes)
7. Re: Backfire (score: 1): Author: Bullwinkle <yd3@nvc.net>; Date: Tue, 29 Aug 2000 21:45:29 -0700; In regards to the distributor, also check to see if both the vacuum and centrifugal advance is working correctly and aren't stuck. Another possibility is an out of time camshaft caused by improper a; /html/mgs/2000-08/msg01680.html (6,750 bytes)
8. backfire (score: 1): Author: Larry Pitts <FUZZY95687@YAHOO.COM>; Date: Thu, 15 Jun 2000 02:30:42 -0700 (PDT); Two questions for the list. As I related in my last post "76b Lives (mostly)", my 76B exhibits some backfiring during engine deceleration and gear change. I'm currently running a Lucas electronic ign; /html/mgs/2000-06/msg00884.html (6,931 bytes)
9. backfire (score: 1): Author: Bill Saidel <saidel@crab.rutgers.edu>; Date: Sat, 08 Apr 2000 09:57:50 -0400; Here's another ignorant (albeint not unlearnable) tuning-beginner's question: What does backfire mean? The details are Not under load, the car in neutral runs up to 4000-4500 purringly. But take it o; /html/mgs/2000-04/msg00283.html (6,545 bytes)
10. Re: backfire (score: 1): Author: Bob Howard <mgbob@juno.com>; Date: Sat, 8 Apr 2000 13:15:50 -0400; Backfiring can mean a couple of things. In the owner's handbook, (English english) it means "banging in the silencer". That is when unburned gas/air from the cylinders gets through the engine and in; /html/mgs/2000-04/msg00288.html (7,864 bytes)
11. Re: backfire (score: 1): Author: "Paul Hunt" <paul.hunt1@virgin.net>; Date: Sun, 9 Apr 2000 14:52:11 +0100; Explosions in the exhaust i.e. audible at the 'back' of the car? Explosions in the inlet i.e. going 'back'wards through the engine? Who knows? Maybe it would be easier to say 'explosions in the inlet; /html/mgs/2000-04/msg00299.html (7,341 bytes)
12. Backfire (score: 1): Author: Wally Teto <monadnoc@wgserv.crystal-mtn.com>; Date: Sun, 17 Aug 1997 23:20:47 -0700; What is the main cause of exhaust backfire? I can't believe how rich I have to adjust my SU's to get rid of it. Adjusting the carbs via the book methods and it just pops back like the blazes. I am ru; /html/mgs/1997-08/msg00945.html (7,604 bytes)
13. Re: Backfire (score: 1): Author: "Christopher G. Moog" <cgmoog@worldnet.att.net>; Date: Sun, 17 Aug 1997 22:31:46 -0400; To get a backfire three things are necessary fuel, oxygen and ignition source. These occur several ways: running lean (doubtful from your description) an exhaust leak (allowing oxygen to enter the ex; /html/mgs/1997-08/msg00951.html (7,770 bytes)
14. Backfire (score: 1): Author: "JedPiper" <JedPiper@earthlink.net>; Date: Sun, 17 Aug 1997 21:50:17 -0500; Regarding your rough running B. Is there a chance that the vacuum advance on your distributor has croaked? The vacuum unit is the round flat object mounted on the side of your distributor and it may; /html/mgs/1997-08/msg00959.html (7,834 bytes)
15. Re: Backfire (score: 1): Author: Wally Teto <monadnoc@wgserv.crystal-mtn.com>; Date: Mon, 18 Aug 1997 02:57:38 -0700; Thanks for the input Chris. I had just installed a new exhaust system with new manifold gaskets all around, so probably not the exhaust. And I tried it without the gulp valve and air pump without a c; /html/mgs/1997-08/msg00961.html (8,193 bytes)
16. Re: Backfire (score: 1): Author: Wally Teto <monadnoc@wgserv.crystal-mtn.com>; Date: Mon, 18 Aug 1997 03:05:54 -0700; Thanks Jed, I had not thought of that. I did advance the timing from the 10 degrees to 15 degrees (both static) with no apparent change. But while doing so (I did it by rotating the dizzy) I noticed; /html/mgs/1997-08/msg00962.html (8,782 bytes)
17. Re: Backfire (score: 1): Author: MLishego@aol.com; Date: Mon, 18 Aug 1997 09:12:25 -0400 (EDT); << Thanks for the input Chris. I had just installed a new exhaust system with new manifold gaskets all around, so probably not the exhaust. And I tried it without the gulp valve and air pump without; /html/mgs/1997-08/msg00989.html (7,483 bytes)
18. Backfire (score: 1): Author: "JedPiper" <JedPiper@earthlink.net>; Date: Mon, 18 Aug 1997 09:17:04 -0500; A few hundred RPM isn't significant enough to indicate a problem with the advance however, I would still swap distributors with your donor as a diagnostic step. If you do try advancing the timimg as; /html/mgs/1997-08/msg00990.html (7,354 bytes)
19. Re: Backfire (score: 1): Author: Wally Teto <monadnoc@wgserv.crystal-mtn.com>; Date: Mon, 18 Aug 1997 14:21:12 -0700; How far past the recommended setting did you advance it Mike? More than 5 degrees? I have heard of people running all kinds of wild advance settings, like 20 degrees more than what the manual advise; /html/mgs/1997-08/msg00991.html (7,479 bytes)
20. Re: Backfire (score: 1): Author: todd@nutria.nrlssc.navy.mil (Todd Mullins); Date: Mon, 18 Aug 1997 09:36:18 -0500 (CDT); How, if the motor is running lean and burning all of the available fuel, do you get fuel into the exhaust system? This is a genuine question; one that I've been pondering for quite some time, as I've; /html/mgs/1997-08/msg00994.html (8,162 bytes)

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