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Re: misfiring? plz help |
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Home away from home  
Joined:
2004/6/9 12:01
From sutho shire, NSW, AUS
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Quote:
I put a set of new spark plugs on and they fouled up real quick and were running #### within hours or driving. It really lost power and when we pulled the plugs out they were terribly fouled black.
Quote:
to me this means that the performace is deteriorating, and swapped leads is not the problem
Posted on: 2004/9/8 6:29
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Re: misfiring? plz help |
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Home away from home 
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2001/2/12 12:02
From Stone Age somewhere in U.S.A.
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more to the point cyls 1 and 4 are directly across from each other on the cap:
1 2
3 4
swap any two across and it will still run, just not too well
remember the firing order is 1-3-4-2
not 1-2-4-3
Posted on: 2004/9/8 6:14
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Re: misfiring? plz help |
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Moderator  
Joined:
2001/5/3 7:04
From 48 North
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Hey Low1000, go out and switch your stock A10 # 1 and # 4 spark plug leads, then startup the engine and see if it misfires or not ... I think you'll find that it will.
Now if it was a wasted spark ignition, maybe not (?), but the Datsun ignition doesn't fire twice per cycle like some of the modern ignition systems.
Posted on: 2004/9/8 6:06
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Re: misfiring? plz help |
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Home away from home 
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2004/3/3 23:53
From Toowoomba QLD
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Quote: hmm if leads #1 and #4 were swapped the performance wouldnt deteriorate ????????????????????? 
Posted on: 2004/9/8 6:01
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Re: misfiring? plz help |
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Home away from home Joined:
2004/6/9 12:01
From sutho shire, NSW, AUS
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hmm if leads #1 and #4 were swapped the performance wouldnt deteriorate. Usually i would say this would be a comppression problem, ie. somthing stopping one of the valves makeing a clean seal with the head, BUT because it is on 2 cyl..... it should be electric. Although a comp. test could save you a lot of mucking around.
Posted on: 2004/9/8 5:53
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Re: misfiring? plz help |
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Home away from home Joined:
2001/2/12 12:02
From Stone Age somewhere in U.S.A.
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another possable scenerio is that you could have mixed up#1 and #4 plug wires and they are not firing in the correct order.
or it could be that your cap needs to be replaced because it's leaking electricly
Posted on: 2004/9/8 5:34
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Re: misfiring? plz help |
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Just can't stay away  Joined:
2003/9/19 10:04
From Sydney
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It pretty much started after i changed the spark plugs and changed the oil. I did nothing else.
I did find heaps of gunk (im assuming ferous oxide) on the inside of the distributor cap on the metal bits. I cleaned them off yesterday.
Posted on: 2004/9/8 5:16
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Re: misfiring? plz help |
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Moderator Joined:
2001/5/3 7:04
From 48 North
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When did it start? Here's a possible scenario: vacuum leak on 2 & 3 (two separate leaks). To compensate, you adjust the idle mixture richer, which smooths out the idle, but now 1 & 4 are way overrich (2 & 3 are happy though).
Or maybe it's an ignition problem. Check the distributor cap throughly for tracking, and check the cam lobe to ensure the points are opening the same amount on all four lobes.
Posted on: 2004/9/8 3:54
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Re: misfiring? plz help |
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Just can't stay away Joined:
2003/9/19 10:04
From Sydney
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Its definately dry black so i doubt the head gasket is toast.
I just drove to uni and in 25 minutes i can tell its chocked up again ill have to clean it:P
Posted on: 2004/9/8 3:29
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Re: misfiring? plz help |
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Moderator Joined:
2001/5/3 7:04
From 48 North
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Is it dry black or wet oily black?
Posted on: 2004/9/8 3:26
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