Annoying intermittent misfire

 Intermittent issue.

For some time now I have been chasing an issue where, after a long run, I would slow to a stop or a roundabout and the engine would start to misfire and stall.

I had checked the carb to ensure it was not leaking fuel.

I checked the plugs and plug leads with no obvious issue.

I checked the voltage on the Pertronix electronic points to make sure that the coil and points were getting the right voltage. I did find an issue here and rewired the ignition system to use a relay to supply full 12v to the Pertronix coil and made it look factory.

I checked the timing and vacuum levels.

The issue was impossible to "make" happen and was intermittent.

I installed an O2 sensor on the exhaust to see what was happening.

When it happened the car would run mega rich and stall but would rev no problem.

Last week the issue happened again and this time with the O2 sensor I could see it want from a slightly lean 15.9 when driving at 100KM/h to 10 and would not move from 10 no matter what I did.

I was able to limp the car home and set about diagnosing the issue.

In talking to my great mate Nev, we determined that the issue must be timing and probably the distributor as this is the only thing I had not changed. Other than going from stock mechanical points to the Pertronix.

I gave the internals a good squirt of WD40 and checked the vacuum advance was working.

We determined that the distributor needed to come out and he would loan me one while I get this original one serviced.

The following are pictures of the distributor when I pulled it out. YUK is all I can say..

On the surface all looks ok.. Right.??

Well no, I pulled the distributor and thought that the base had been broken. It looked that bad!

After a quick wipe, the crud came away to find that all was well at it was just 170,000km of crud!

I then removed the Pertronix to find that vacuum advance plate to be very rough and caked in crud!

This is the underside of the vacuum advance plate.

This is the top of the vacuum advance pate. I was actually able to make it stick while still in the distributor. So I think we have found the problem.

Here is the distributor with out the vacuum advance plate. The liquid in the bottom is just excess WD40. I then cleaned this out.

I ahve reassembled the unit and taken it to Nev who will take it to Performance Ignitions in Nunawading to be rebuilt and adjusted to make better use of modern fuels.

Nev has loaned me a Bosh unit that were used in Australian built Clevelands while mine is repaired.

I could have cleaned it out myself, but figured it is better to get it serviced and retuned.

Looking forward to getting it back.

Window winder handles

 Finally found the right knobs

For a while I have been looking to find the correct colour for the window winder knobs in the Mustang and then once I found the right colour, the next challenge was to find replacements.

Per this pic, the original clear knobs had got rather warm over time and had discoloured.

I found the follow line item at Custom Mustangs

So I ordered a a pair to find that the handle is correct but the knob is from an earlier model and does not have the star burst in the centre.

After a bit of discussion with the guys at Custom Mustangs, the also stock a '73 winder with the correct knob but the door end of the winder is not correct for a '72 as the disk that covers the screw will not fit.

So I decided to roll the dice and get a pair of '73 handles with the knobs that are riveted on to the incorrect handles and see if I could remove the knobs and use them on the new correct handles I purchased.

Once I removed the new knobs of the '73 handle I found that the knob end of the handle is the same as the original handles and wont fit the reproduction ones.

Here is a picture of the 3 types.

Both the original and the '73 knobs have been removed from the handle by drilling out the rivet.

The one on the right is the earlier version that the knob is not exactly correct.

So the only option I had was to use the original handle with the new knob from the '73 handle.

So I drilled out the centre of the new knob and cut a screw to length and used the pressure washer to enable the knob to spin

Here is the original handle with the new knob attached.

Here is the before and after knob on the handle.

Here is the winder installed.

I now have 2 x '73 handles with no knobs and a set of  '70 handles and knobs unused that I will look to return to Custom Mustangs.

Job Done!

Now to the next task.