Pre ignition problems.

[twincab75]

Hi guys i have a 77 5 door and just took out the 1600 and put an 8v 1800 from a mk2.as i was pulling the 1800 out of the Doner car i broke the vacuum chamber on the dizzy so i put the dizzy from the 1600 in the 1800 and now i cant stop the engine from pinging like mad!.what i want to know is there a difference in the dizzys? and if so what should i use? any help whould be great.thanks

---------- Post added 10-11-2011 at 12:10 PM ---------- Previous post was 09-11-2011 at 10:39 AM ----------

please help!

[GRN_VAGN]

no difference as far as i can tell.
Double check timing, points, leads ect.

PS, im running a 1600 dizzy in a 1800 engine ;

[twincab75]

Thanks for the reply.im running electronic ignition.dont know if this makes any differance .ill check everything again

[GRN_VAGN]

Not sure, should still be fine. maybe something is faulty??

[roccodingo]

What static timing position have you set the distributor to ??

Does the vacuum canister have advance only or advance & retard ??

Try sucking on the vacuum line to the canister ( engine not running) to see if you have perforated the diaphram in the canister, check and mnake sure its moving the timing plate inside the dizzy as well...