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 .
#26 _threeblindmice_
Posted 29 November 2017 - 06:25 PM
#27
Posted 29 November 2017 - 09:04 PM
#28 _threeblindmice_
Posted 30 November 2017 - 07:04 AM
#29
Posted 30 November 2017 - 07:20 AM
loose engine earth ?
#30 _threeblindmice_
Posted 30 November 2017 - 01:52 PM
Just checked it Col , It's tight and the linkage is clear of all wiring .
#31
Posted 02 December 2017 - 01:23 AM
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
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_
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_
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_
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
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
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
Posted 11 December 2017 - 08:08 PM
#39
Posted 11 December 2017 - 08:17 PM
#40 _threeblindmice_
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
Posted 12 December 2017 - 08:10 AM
What fuel are you using?
#42 _threeblindmice_
Posted 12 December 2017 - 06:16 PM
#43
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_
Posted 12 December 2017 - 08:37 PM
yes
#45 _threeblindmice_
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
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_
Posted 12 January 2018 - 06:46 PM
Booked in for one next week , that will sort it out John
#48
Posted 12 January 2018 - 10:36 PM
No worries Bruce,hope you get it sorted out and diagnosed...
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