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Six Cylinder Coil

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#26 threeblindmice

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Posted 29 November 2017 - 06:25 PM

So what's next , I have changed coil , condenser , plugs , points , coil lead , plugs , cap,  rotor button , distributor and carburetor , but the miss is still there most days , some days it's almost gone and other days it's worse . the plugs are a nice light colour , I have run it at several advanced settings , and tried three different sets of main jets . It will drive all day never miss a beat until full throttle at most revs , lift the foot of a little and the miss goes away .



#27 rodomo

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Posted 29 November 2017 - 09:04 PM

Plug lead.

#28 threeblindmice

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Posted 30 November 2017 - 07:04 AM

It feels more like a total miss more than one lead unless they all went at the same time , been thinking them next then a jumper lead to cut out the normal wiring . I think I tried a set of leads when it first started but that was a long time ago , then I was too busy to look at it for six months .

#29 RallyRed

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Posted 30 November 2017 - 07:20 AM

loose engine earth ?



#30 threeblindmice

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Posted 30 November 2017 - 01:52 PM

Just checked it Col ,  It's tight and the linkage is clear of all wiring .



#31 frash da bucket

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Posted 02 December 2017 - 01:23 AM

Hi Bruce,

Have you still got the original coil off it?
My LJ gtr used a GT-40R,Resistor coil.
My Xu-1 uses the same GT-40R.
All torana's from 69 to 73,ran the resistor coil.

Regards John.

#32 Cook

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Posted 02 December 2017 - 06:45 AM

Gents, take my advice with a grain of salt as I have little knowledge of such things but, is it possible it isn't the coil and possibly a fuel issue.  I recently had problems with a dead spot on acceleration through all gears and was  told my carby accelerator pump was faulty only allowing a small amount of fuel to trickle through.  Just a thought.  Cheers Ron



#33 threeblindmice

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Posted 02 December 2017 - 10:59 AM

The new coil didn't fix it , John , I didn't put the old one back on . I bought a new carbie Cook  just in case it was fuel . With all the new parts now  I'll go back to the start and as rodomo said try a new set of leads .



#34 SableMet7/73

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Posted 10 December 2017 - 12:16 AM

Got a multi-meter?

Could try a resistance test on your leads. Set to ohms & record each reading longest to shortest.

Longest will be higher reading than shortest, if you've got a reading that don't fit in the graduation from

high to low that could be your problem lead.

Give them a twist &/or wiggle while connected & see if fluctuating or open reading to check for a dodgy lead too.

My meter has screw-on alligator clips for the probes so makes this a little easier. 



#35 threeblindmice

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Posted 11 December 2017 - 10:02 AM

I put a new set of wire leads on the other day , still the same , I don't think it is the ignition switch it starts easy and will pull well up to 7/8 th throttle and never backfires .

It might be though the range a bit , not as a miss just as not going 100pecent  ,it is a bit hard to tell as the old head on it collapsed the combustion chamber and a less worked head was fitted , that's about when the trouble started .



#36 S pack

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Posted 11 December 2017 - 07:50 PM

I put a new set of wire leads on the other day , still the same , I don't think it is the ignition switch it starts easy and will pull well up to 7/8 th throttle and never backfires .

It might be though the range a bit , not as a miss just as not going 100pecent  ,it is a bit hard to tell as the old head on it collapsed the combustion chamber and a less worked head was fitted , that's about when the trouble started .

Perhaps the head gasket is leaking between two cylinders or you have a dud new spark plug. I once had a set of new Bosch plugs that lasted about 30 or 40km before one or two of them gave up.



#37 RallyRed

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Posted 11 December 2017 - 07:57 PM

hmmm...

wonder if you could do 6 test drives. Wouldnt be glamourous, but....
Each drive, remove 1 (different) plug lead, and reconnect the one you had off last time.
If the problem goes away with plug lead ""X"" disconnected...there's your problem.(lead/plug)
If the problem is still there with all combinations of leads/plugs  tested, then you can probably rule the lead/plug idea out .?

Just an idea.

Assumes you can replicate the issue on 5 cyl.



#38 grumpy xu1

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Posted 11 December 2017 - 08:08 PM

Maybe a comp test is needed, if you're sus on the head or gasket & maybe some more plugs.

#39 grumpy xu1

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Posted 11 December 2017 - 08:17 PM

Theoretically if the plug or lead is the only item with a problem, then pulling the lead off whilst running should drop the revs anyway.

#40 threeblindmice

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Posted 11 December 2017 - 11:51 PM

It was the same stutter before and after the new coil plugs leads cap condenser rotor button , I even put another distributor in because shaft had a small bit of play . It doesn't miss like one it's a single pot , no water in the oil and it doesn't overheat or use water and all the plugs look like they are working all a nice dry grey/brown , no fuel filter , and  it will pull up to 5K RPM smooth at 7/8 throttle , I am going to do 200 km tomorrow to get a Christmas tree and counter lunch , maybe something may show up , I might try and check the plugs after a long full throttle  hill .



#41 S pack

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Posted 12 December 2017 - 08:10 AM

What fuel are you using?



#42 threeblindmice

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Posted 12 December 2017 - 06:16 PM

Attached File  DSCF0075.JPG   153.74K   0 downloadsAttached File  DSCF0099.JPG   208.9K   0 downloadsAttached File  DSCF0193 (2).JPG   178.11K   0 downloadsI only use 98 Dave  , I found a nice long full throttle hill today and checked the plugs at the top  , it looks like three pots down maybe cracked rings I'll give it a compression test next . The picture shows it was almost cleaned up by the time I got home .

#43 rodomo

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Posted 12 December 2017 - 08:20 PM

Are the plugs layed out in order? 1 to the right and 6 to the left?



#44 threeblindmice

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Posted 12 December 2017 - 08:37 PM

yes 



#45 threeblindmice

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Posted 08 January 2018 - 11:09 PM

I finally got it booked in for a compression test next week , the mechanic is thinking valve damage from running unleaded , any thoughts on that ?



#46 frash da bucket

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Posted 11 January 2018 - 04:50 PM

Hi Bruce,

 

Have you done your compression test?

Do you use genuine bosch parts,rotor button,and cap? when you replaced them?

I noticed you have your plates off the Brown UC,the one we got from Temora?

Nice touch the plates give it the old style look...

 

Regards John.



#47 threeblindmice

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Posted 12 January 2018 - 06:46 PM

Booked in for one next week , that will sort it out John 



#48 frash da bucket

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Posted 12 January 2018 - 10:36 PM

No worries Bruce,hope you get it sorted out and diagnosed...






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