by lambaj » Tue May 23, 2006 10:38 am
Yeah, I'd give it a flush, just don't go mad on the revs on flushing oil - its very thin..... Then a nice new filter and drop of decent 20-50 or at a push 10-40 and hopefully the ol girl will be happy.
If it still does not want to start, pull the Centre HT lead off the cap and stick a sparkplug in the end, then earth the body of the plug. Get somebody to crank the engine over on the starter whilst you watch the plug. You should get a stream of nice healthy sparks.
If you do, then good. Refit the centre lead and remove an engine plug. Check you get sparks the same way as before from the appopriate HT lead. If course, there will be fewer sparks, but they should still be healthy. From this point, the ignition system is working, but the timing may be well out, or even have the HT leads going to the wrong cylinders. Firing order is 1-3-4-2 (I think!) so you need to find out which cylinder is on compression and make sure the rotor arm is pointing at the correct HT lead in the cap.
Back to the coil.....If the centre lead does not spark, then you need to look at the low tension side of the ignition. Check that the voltage on the + teminal of the coil is 12V when the ignition is on. If ok, then remove the - teminal connection and measure the voltage on the - terminal of the coil with the ignition on. It should be 12V on both terminals of the coil now. If this is OK, then the chances are the coil is OK. Next measure the resistance between the lead going from the - teminal of the coil dowm to chassis. This should be either a short circuit, or an open circuit depending on the position of the contact breaker. If it is a short, the points should be closed. This is the only time there should be a short. Turn the engine over by hand and make sure the contact breaker is acting like a switch. If you do not have a multimeter to measure these things, the same checks can be done using a small 12V bulb with one wire connected to a 12V supply (the battery) and the other wire as the test point. IF the test point is short to chassis, then the bulb will light, if open circuit then bulb stays off. If the bulb glows dimly then there is a measured resistance rather than a short. In the case of the contact breaker , you want either fully on or completely off.
Still with me ??
Anyway, after these checks, you "should" have a functioning ignition circuit. Timing will be the next thing to check if she still will not play, then back to the fuel. The easy-start will work. Apparently a Lynx aerosol will also work just as well, and makes you exhaust very attractive to the opposite sex too....... Ummmm....
If it runs on an aerosol, then the problem will be down to the fuel/carb etc
Back to you.... good luck
Tony (HA21)
"Ere look - thats one of them Mk2 Vauxhall Cortinas....!!"