Bombsquad Posted August 13, 2009 Share Posted August 13, 2009 Hoping someone on here might be able to help me out before i end up going insane... The car i need help with is an 86 rwd 323 wagon. 1300cc piston motor. The car was originally a 1500 however that motor lost compression so has been replaced with a good 1300. Heres the problem... The engine is fitted and cranks over fine, has good compession and vacume through the carb. Its getting fuel fine. It has good spark at the plugs however its backfiring (fuel vapour, not a flame etc) up through the carby, Ive checked the timing, seeing i thought it must be firing on the upward stroke in order for backfires to occur, but timing seems perfect Ive checked the firing order of the leads like a million times and they are correct Anyone wanna help get this thing going?? Quote Link to comment Share on other sites More sharing options...
Steelies Posted August 13, 2009 Share Posted August 13, 2009 would it do that if timing was perfect but 180deg out perhaps? my falcon backfires vapour and smoke about 3 times for every cold start, so i'm actually the wrong person to try and help. mint. Quote Link to comment Share on other sites More sharing options...
shizzl Posted August 13, 2009 Share Posted August 13, 2009 thats what id be trying....or, spray in some "start ya bastard"... Quote Link to comment Share on other sites More sharing options...
Bombsquad Posted August 13, 2009 Author Share Posted August 13, 2009 tried spraying in engine start, makes no differnce timing cant be 180 out as the rotor lines up with the correct plug lead on the dizzy cap Quote Link to comment Share on other sites More sharing options...
FuzzayD Posted August 13, 2009 Share Posted August 13, 2009 have you checked that piston 1 is at the top when dizzy number 1 lead lines up? by taking out spark plug 1 hand turning and waiting till just before it sucks your finger, and then lining up the dizzy contact point to spark plug 1. If its not just undo the 2 bolts on the dizzy pull it out a bit and twist it round till the cog slides in and lines up firing point 1. Or crank the engine and see which way the rotor turns just to make sure the cap is spinning the same way as your firing order. I had the same thing when i got my 1300 323 motor i pulled of the head and found that oil around the pistons looked like varnish and there was about 2 cup fulls of water sitting in there not draining away. Quote Link to comment Share on other sites More sharing options...
Bombsquad Posted August 13, 2009 Author Share Posted August 13, 2009 Done both of those ideas mate, checked both first and third piston (in relation to firing order) and both line up fine. Quote Link to comment Share on other sites More sharing options...
Brock-Lee Posted August 13, 2009 Share Posted August 13, 2009 you sure its on the compression stroke? EDIT: maybe thats what you meant in your last post Quote Link to comment Share on other sites More sharing options...
Crownin_Round Posted August 13, 2009 Share Posted August 13, 2009 Carb problems? give it some compressed air treatment.. Quote Link to comment Share on other sites More sharing options...
Mk1Mad Posted August 13, 2009 Share Posted August 13, 2009 Had same problem on my mini. Lots of head scratching and 'start ya bastard' spray. Took the carb apart and cleaned out good and proper, refitted and now its perfect.. Carb rebuild is my vote. Quote Link to comment Share on other sites More sharing options...
Bombsquad Posted August 13, 2009 Author Share Posted August 13, 2009 Cant be the carb as the plugs are wet when removed (engine is not flooded before anyone goes there! ) so fuel is being delivered to the cylinders and plus i have tried to different carbs and neither make any difference Quote Link to comment Share on other sites More sharing options...
Crownin_Round Posted August 13, 2009 Share Posted August 13, 2009 I had almost the same problems on a car I just sold, carb was pulled apart cleaned and put back on and it improved but turned out it was a fuckt accel pump.... Quote Link to comment Share on other sites More sharing options...
Bombsquad Posted August 13, 2009 Author Share Posted August 13, 2009 Its surely gotta be something to do with the timing??? ive tried to carbs of running motors and neither makes any difference. The next plan of attack is to pull of all the leads from the plugs and put them back on one at a time and try to start it each time, which might in theroy prove which plug is causing the backfire through that carby??? Quote Link to comment Share on other sites More sharing options...
KKtrips Posted August 13, 2009 Share Posted August 13, 2009 I'm sure I put a post up here before about this but it seems to have gone... I would initially check your TDC is correct - remove rocker cover - turn engine over till TDC lines up on the pulley and then check that both rockers have clearance on top of the valve on number one cylinder. (if not - turn engine over 360 degrees and check valve clearances again) After this, check your rotor lines up to the number 1 HT lead on the cap Next check your firing order again - make sure that the firing is in the correct order relative to the distributor rotation, correct firing order is 1-3-4-2 - it could be clockwise or anticlockwise - have someone turn the engine over with the distributor cap off and watch for which is the correct direction. Lastly set the static timing - it should be set to 5 degrees BTDC (to be safe) If all these are fine - check your tappet clearances.. If tappets are fine - you are going to need someone to go a bit more in depth and would be too involved to diagnose over the net... Quote Link to comment Share on other sites More sharing options...
Bombsquad Posted August 13, 2009 Author Share Posted August 13, 2009 Cheers for the input guys but i fixed it now. Was timing issues as i suspected. Quote Link to comment Share on other sites More sharing options...
Requiemk Posted August 13, 2009 Share Posted August 13, 2009 what was the exact issue? leads around wrong or timing incorrect? Quote Link to comment Share on other sites More sharing options...
KKtrips Posted August 13, 2009 Share Posted August 13, 2009 what was the issue? Quote Link to comment Share on other sites More sharing options...
Jase Posted August 13, 2009 Share Posted August 13, 2009 making cock ups makes us smarter i pulled the reversed lead order when i was 16 good ol pop slapped my head and laughed for days especially with me scrutineering a haynes manual until the pages were fraying Quote Link to comment Share on other sites More sharing options...
Bombsquad Posted August 13, 2009 Author Share Posted August 13, 2009 leads were fine, i pulled the dizzy out of the head and retimed it off the front pully (exactly what id done the last 5 times) but for some reason it decided it wanted to live this time Quote Link to comment Share on other sites More sharing options...
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