Hi all
I've got a holden lj torana with a 202 and a 350 Holley. One day i started the car up and it just kept backfiring through the exhaust, nonstop. The spark plugs are new, the leads are new and the dizzy cap is new. The RAA told me to replace the points and check the timing so i did. Still not fixed. I got my mechanic to look at it, he tuned the carby, got the timing right and it seemed to be running fine. The next day i went to start it up and it was back to the way it was, backfiring out the exhaust...HELP!
Urgent Help! completely stumped..
Started by
_TORRY6_
, Oct 14 2006 03:15 PM
22 replies to this topic
#2
_DocDamage_
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Posted 14 October 2006 - 04:49 PM
Sounds like intermitant power. If it came good for a bit after the timing was done I'd check the wire from coil to points. If it's not that try hotwiring it, run power from battery to positive on the coil if it comes good then your problem is probably somewhere in the wiring before the coil.
#3
rodomo
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Posted 14 October 2006 - 05:21 PM
Is the backfiring happening on decelleration?
#4
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Posted 14 October 2006 - 05:52 PM
Also check that the roll pin on the base of the distributor shaft that holds the drive gear on hasn't sheared. If it does, it can allow the dizzy drive gear to rotate on the shaft, which will really screw up your timing. If it does break, quite often it will still catch in a prticular position for a while before moving again - this might have been why readjusting the timing fixed the problem for a while.
Could also possibly be a stuck valve - a compression check will find out.
Could also possibly be a stuck valve - a compression check will find out.
#5
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Posted 14 October 2006 - 06:42 PM
Make sure you can turn the rotor by and and that it springs back.
#6
_TORRY6_
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Posted 16 October 2006 - 12:52 PM
Thanks guys! Gonna have another look at it then send it to the mechanic..
#7
makka
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Posted 16 October 2006 - 01:03 PM
the balancer hasnt spun? giving a false timing reading?
checked the condenser in the dizzy?
checked the condenser in the dizzy?
#8
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Posted 16 October 2006 - 05:39 PM
Again I ask if it is backfiring on decelleration?
#9
_TORRY6_
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Posted 16 October 2006 - 06:35 PM
Yes, also when idling...running the worst ive heard!
#10
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Posted 16 October 2006 - 08:27 PM
Check the dizzy cap for cracks or carbon tracking under the cap.
#11
_willo_
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Posted 16 October 2006 - 08:37 PM
try another coil if you got one. these can give inconsistent spark when on the way out
#12
makka
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Posted 17 October 2006 - 02:29 PM
what do your plugs look like? tan, black or blistered ect. are they new?
#13
_devilsadvocate_
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Posted 17 October 2006 - 03:52 PM
exhaust and inlet manifold sealing properly, is it firing out the carby or just the exhaust
#14
_DocDamage_
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Posted 17 October 2006 - 04:02 PM
Just fixed a car with the same prob as devil specifies not 10 mins ago. Same symptoms as you describe too.
#15
_TORRY6_
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Posted 31 October 2006 - 09:30 AM
hey guys, problem solved...Mechanics had a look at it and i gave him my twin dizzy carby, he put that on n got the carby overhauled. Should be all running good when i get it back today 
#16
makka
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Posted 31 October 2006 - 11:01 AM
your twin dizzy carby? WTF?hey guys, problem solved...Mechanics had a look at it and i gave him my twin dizzy carby, he put that on n got the carby overhauled. Should be all running good when i get it back today
#17
LX2DR
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Posted 01 November 2006 - 08:39 PM
I agree, whats a twin dizzy carbyyour twin dizzy carby? WTF?hey guys, problem solved...Mechanics had a look at it and i gave him my twin dizzy carby, he put that on n got the carby overhauled. Should be all running good when i get it back today
Some new high performance doo-dad we haven't heard of before?
Edited by LX2DR, 01 November 2006 - 08:40 PM.
#18
rodomo
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Posted 01 November 2006 - 10:58 PM
Must be rice. See associated thread.
#19
TerrA LX
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Posted 01 November 2006 - 11:01 PM
nah sounds like something off eBayMust be rice. See associated thread.
#20
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Posted 02 November 2006 - 02:31 PM
^Correct, my apologies 
#21
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Posted 02 November 2006 - 07:32 PM
sounds like something out of The Newcastle Song to me!
#22
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Posted 02 November 2006 - 11:10 PM
Or "greased lightning" from grease.
#23
_Keithy's_UC_
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Posted 19 November 2006 - 10:32 PM
The twin dizzy carby? I think the problem was not in the carburettor, but in the fuel tank. I had a problem with my motor about 2months ago which turned out to be stale fuel. Once i put a fresh tank of fuel in and a couple of kms on it, it all came good!
Cheers
Keith
Cheers
Keith
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