13 replies to this topic

[tango'd]

1275gt
year unown
cant get it to run smooth and with out back firing
road race cam, make and model unown





ok ill go over what has been tryed and tested to date.

oil pressure tested and fine

compression tested and good

timing set and advance waits checked all spot on

firing config 1342 fine

carb and manifold taken off carb cleaned and gasket replaced, all fine and no leeks



tryed almost everything but cant stop the back firing and runs lumpy, the only think i can think of is the cam and valve set up, but if any one has any other things i can check please feel free to post it up, the more help the better


thanks guys

Edited by tango'd, 25 August 2008 - 07:48 PM.

[Rosslin Racing]

try 1342

[Retro_10s]

firing config 1243 fine

BONG!... 1342 is the firing order, rosslin you beat me to it you banana

Edited by Retro_10s, 25 August 2008 - 07:44 PM.

[tango'd]

try 1342

why is that, i was shore that the firing set up was 1243 or am i confused??


nope im confused its been a long day and i have put it down rong twice so ignore the 1243 guys im tyrd lol

Edited by tango'd, 25 August 2008 - 07:47 PM.

[Retro_10s]

You are wrong and confused Firing order on an A-series engine is 1342.

Edited by Retro_10s, 25 August 2008 - 07:47 PM.

[Rosslin Racing]

firing config 1243 fine

BONG!... 1342 is the firing order, rosslin you beat me to it you banana

and i had to check to make sure even after the 1000th time!
was listening a bit of yello today must of rubbed of a bit

[tango'd]

firing config 1243 fine

BONG!... 1342 is the firing order, rosslin you beat me to it you banana

and i had to check to make sure even after the 1000th time!
was listening a bit of yello today must of rubbed of a bit

i no how you feel, we have been working on the car most of the day and nothing seems to have changed since we started working on it last week even tho we have tryed soooooo much and acheaved so little

[tango'd]

bump

[Rosslin Racing]

so how dose a back fire come about? you have petrol in the exhaust that is firing? so is the cam timing correct? if you have lined up the dots the chances are it might not be correct? remove the rocker cover to see what the valve are doing take out the plugs and the dizzy cap line up to fire on number 1 and see what the rotor arms doing are the points open look to see if the exhaust is still open. maybe the problem will show its self.

[tango'd]

so how dose a back fire come about? you have petrol in the exhaust that is firing? so is the cam timing correct? if you have lined up the dots the chances are it might not be correct? remove the rocker cover to see what the valve are doing take out the plugs and the dizzy cap line up to fire on number 1 and see what the rotor arms doing are the points open look to see if the exhaust is still open. maybe the problem will show its self.

will give that a go tomoz but as the post sez, it the one thing we havet checked so its next on the list. thanks again

[Rosslin Racing]

lets us know how you get on. some times it makes it all clear after a cupper or a nights sleep

[Retro_10s]

have you check the firing order then?

backfiring also often caused by under fuelling by the way...

Edited by Retro_10s, 25 August 2008 - 08:19 PM.

[tango'd]

have you check the firing order then?

backfiring also often caused by under fuelling by the way...

when we took the carb off for cleaning there was puddles of fual sitting at the top of the inlets on the head and the carb has been striped, cleaned and rebuilt so i think fual is fine, the firing order is fine and has always been fine i just had a moment of crazyness when i 1st posted and i put it down rong

[mk1leg]

Hi try checking dizzy leads on cap 1-3-4-2 in anticlockwise order starting with No1 @ 1o'clock..............