First job was to sort out a misfire that has got worse recently, especially above 3500-4000rpm. I was thinking it was a fuel issue but thought it was worth checking the other basics like ignition. Poking around the engine I noticed the points gap looked too small so thought it was worth adjusting them, but I had forgotten how much of a pain that is on a standard TR7 with the AC Delco distributor. Having got the points set up better (or so I thought) I found the misfire was now much worse, despite checking the timing was spot, on so I decided to bite the bullet and fit the Lumenition set that was on the shelf. I also had a spare Delco distributor already made up with the Lumenition inside.
This was when I discovered the distributor was held in by the wrong bolts. All the bolts in the TR7 engine are UNF unless they are into aluminium in which case they are UNC. As you can see from the picture some idiot had used the wong ones.
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| Correct UNF bolt on the left, wong UNC bolt on the right. |
