10 replies to this topic

[Ross mini 30]

car turns over has spark and fuel on plugs,engine sounds like it turns over fast enough but just wont fire,engine bin out to fit new head gearbox clutch and electronic dizzy and coil,think the plugs are on in the right order but it wont start all i get is a back fire through carbs hope some 1 can help...

[Ethel]

The timing is out,

A regular topic on here - search using dizzy, timing etc.

[Retro_10s]

As Ethel sais, it sounds as if the Timing on the Dizzy is way out causing the Back firing into the carb... do a TMF search for 'carb back firing' etc.. and it should shed some light on the problem.

If you still want to check the Firing order,... here's a pic to help. The numbers indicate which cylinder to connect the Ht lead to (number one being at the radiator end of the car.) moves anti clockwise.

P.S> picture ammended, i made a big booboo!

Attached Files

•  CAP108.jpg   10.72K   3 downloads

Edited by Retro_10s, 02 August 2007 - 12:06 PM.

[Ethel]

As Ethel sais, it sounds as if the Timing on the Dizzy is way out causing the Back firing into the carb... do a TMF search for 'carb back firing' etc.. and it should shed some light on the problem.

If you still want to check the Firing order,... here's a pic to help. The numbers indicate which cylinder to connect the Ht lead to (number one being at the radiator end of the car.)

Sorry, but I think the pic's the wrong way round the rotor arm goes anti clockwise with 2 under 1

[Retro_10s]

yes you are right, 1342 anti clockwise, sorry

the dizzy cap should be pointing roughly at 2'oclock when firing cylinder number one.
(picture now ammended) (oh my god i can't believe what a rookie mistake that was, i'm so sorry.)

Edited by Retro_10s, 02 August 2007 - 12:07 PM.

[Ross mini 30]

how do i know that the dizzy is on the right wayround,i cant turn the engine over by hand as i have no drive shafts in,as far as i can c its all lined up in right way and leads are 1 at 2 oclock and so on anti clock wise,little bit stuck

[Retro_10s]

It is possible the dizzy has been installed 180 degrees out...

[Ross mini 30]

iv moved the dizzy round and started to get a popping from the exhuast is this good or bad lol im charging the bat now as iv drained the power outa it.

[Retro_10s]

car turns over has spark and fuel on plugs,engine sounds like it turns over fast enough but just wont fire,engine bin out to fit new head gearbox clutch and electronic dizzy and coil,think the plugs are on in the right order but it wont start all i get is a back fire through carbs hope some 1 can help...

so it could be either>

head, dizzy or coil, all of these are crucial when set up,

have you got the right kind of coil for your electronic dizzy? sounds like the back firing could be caused by the dizzy firing at the wrong time,...

[Ross mini 30]

its a new dizzy and coil to match the dizzy its had a newish head fitted thats only done 900 miles and a new head gasket.could it be the dizzy drive from the cam could this be in the rong place<i had some 1 check it all b 4 i put engine back in so im hoping that its not rong...
where should the vacume pipe nipple be when a electronic ignition is fitted?

Edited by Ross mini 30, 02 August 2007 - 02:37 PM.

[dklawson]

You'll need to set the static timing, then if necessary, re-order the spark plug wires. It doesn't matter where the rotor button happens to be pointing as long as the plug wires are installed sequentially to match.

See this recent thread:
http://www.theminifo...x...1&hl=static
where I discussed static timing. Since your driveshafts are removed, pull your engine over using the fan belt with the plugs removed.

In the earlier thread I discussed how to set the timing by watching when the points open and create a spark. With your electronic ignition this won't work. Instead, make up a 12V test lamp with two wires and a turn signal bulb. Connect your test lamp between the coil (-) terminal and chassis ground. During the static timing procedure as described in the earlier thread, watch for your test lamp to go "on" instead of looking for a spark.

If once you've set the static timing (and put the spark plug wires on in the correct order) things don't improve, further backfiring through the carbs indicates a seriously lean condition and you'll need to make sure your carb(s) are getting gas, that the float valve(s) are set correctly, and that the jet tube/needle are not blocked. Don't forget to check the oil in the carb dashpot either.