Jump to content

Ignition problems

Ken Young

Recommended Posts

I have a 67 GT6 and it has suddenly developed a knocking problem with ignition.  The problem literally started in between me parking to go to a shop and then starting the car again.  The problem is most severe when accelerating or loading the car.  I have done some diagnostics on the car as follows.  

The ignition vacuum advance / retard seems to be working alright.  I can see the mechanism pulling in when I rev the car in the garage.      However, there was a small, unidentified piece of spherical black plastic in the distributor.  I couldn't find where it came from so may be related?

The idle setting of the car increased and I noticed the linkage to the accelerator pedal on the entrance to the first carb needed tightening.  As far as I could see this only seemed to affect the idle RPM, but it could be an indication of a carb problem and the mixture being too weak.  

Does anyone have any simple diagnostics I can try to work out what the problem is?



Link to comment
Share on other sites

Quoted from RobPearce
Check the advance at idle. I've had distributors "stick" with mechanical advance on, which would leave you over-advanced at low speed. Normally repairable with a bit of wiggling and lube, but might need a strip-down and clean-up.

I thing Rob has nailed it here.  Advance mechanism has stuck in the advanced condition, which explains both the faster idle and pinking (if that's what you meant).  My PI did this.....


Link to comment
Share on other sites

Quoted from Jonny-Jimbo
The spherical black plastic, might not be plastic and could be the spring loaded contact from the central connection on the dizzy cap.

Not too sure about this. If a GT6 Delco dizzy cap is like a Spitfire cap the center contact is fixed. The spring loading is built into the rotor.
                                                                  All the best,

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...