tintin Posted February 18, 2016 Share Posted February 18, 2016 Can anyone help I have had a problem with getting constant spark. With a timing light attached the light does not have a constant pulse, it pulses well then stops and then hit and miss and carry on occurs. I have replaced leads, plugs, cap, points, condenser and coil and can't figure out what else to do. This is on an Toyota 18r (the vehicle I'm trying to sell) and has just suddenly started doing it, it will strart when cold and runs well then dies and won't start again if it does start it has a really bad miss. Vehicle was running well last week the only new thing i have done is the coil I put on today to try and fix it Quote Link to comment Share on other sites More sharing options...
h4nd Posted February 18, 2016 Share Posted February 18, 2016 Check ballast resistor and switching circuit? Quote Link to comment Share on other sites More sharing options...
Ned Posted February 18, 2016 Share Posted February 18, 2016 How do the plugs look? Maybe its running rich somehow and fouling the plugs, but runs fine when cold because that's when it loves extra fuel? Maybe check (auto) choke? Quote Link to comment Share on other sites More sharing options...
KKtrips Posted February 18, 2016 Share Posted February 18, 2016 Did you wipe clean the points surface before installing them? Â The two contact points will have anti-corrosion coating on them and it needs to be wiped off before installing them. Â I always used to open them up with my thumb and then clamp them down onto the collar of my overalls and rub them back and forth half a dozen times before installing them. 1 Quote Link to comment Share on other sites More sharing options...
tintin Posted February 18, 2016 Author Share Posted February 18, 2016 Everything was replaced probably 6weeks ago and has been going fine, this miss fire is new so I replaced the coil today with no change It's not a fuel problem it is a electrical problem getting constant spark to the spark plugs, have had them out and earthed them, don't know where or what the problem would be, do I start replacing stuff again Quote Link to comment Share on other sites More sharing options...
subgy Posted February 18, 2016 Share Posted February 18, 2016 Sounds like you've gone through everything just re check again .  I would suspect the new HT leads could be of poor quality and are breaking down when get warm.   Have had this happen on an HJ Holden 173.  Did you replace the HT lead between the coil and distributor as well? also check low voltage connections  in distributor between points condenser  earth if anythings loose - not conneced up correctly Quote Link to comment Share on other sites More sharing options...
EFI_LC Posted February 18, 2016 Share Posted February 18, 2016 Dizzy could be fluttering. Too much play in the shaft. Bad earth can cause all sorts of dramas. Â hmm can't think of much else than already done Quote Link to comment Share on other sites More sharing options...
tintin Posted February 18, 2016 Author Share Posted February 18, 2016 Sounds like you've gone through everything just re check again . I would suspect the new HT leads could be of poor quality and are breaking down when get warm. Have had this happen on an HJ Holden 173. Did you replace the HT lead between the coil and distributor as well? also check low voltage connections in distributor between points condenser earth if anythings loose - not conneced up correctly All leads were replacedWill check leads tomorrow Quote Link to comment Share on other sites More sharing options...
tintin Posted February 18, 2016 Author Share Posted February 18, 2016 Dizzy could be fluttering. Too much play in the shaft.This has crossed my mind but can't feel any play from the top,how can I check to make sure? Quote Link to comment Share on other sites More sharing options...
tortron Posted February 18, 2016 Share Posted February 18, 2016 Do you still have the old components? Quote Link to comment Share on other sites More sharing options...
tim13 Posted February 18, 2016 Share Posted February 18, 2016 hey buddy , pretty sure it will be the condenser , new ones are often useless , put old one back or try another new one ...... maybe even genuine or different suplier if possible . good luck 1 Quote Link to comment Share on other sites More sharing options...
tim13 Posted February 18, 2016 Share Posted February 18, 2016 almost worth repeating ! Quote Link to comment Share on other sites More sharing options...
tintin Posted February 18, 2016 Author Share Posted February 18, 2016 Cheers guys will try a few things over the next few days and update how it turns out Quote Link to comment Share on other sites More sharing options...
Seedy Al Posted February 18, 2016 Share Posted February 18, 2016 check your points gap while your at it, I assume you had grease on the shaft lobes that the points run on? not that should really cause the problems you speak of...... Quote Link to comment Share on other sites More sharing options...
tintin Posted February 19, 2016 Author Share Posted February 19, 2016 hey buddy , pretty sure it will be the condenser , new ones are often useless , put old one back or try another new one ...... maybe even genuine or different suplier if possible . good luckMate you are a legend, Put an old one in I found in the shed and purrs like a kitten again. Thanks 1 Quote Link to comment Share on other sites More sharing options...
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