top dead center?

Question

I have a 1965 international school bus and its miss fireing after i put new plugs and wires why?

Answer 1

Ok now that you have had all the crap from the know nothings, here is something you can use.
First find the #1 sparkplug. Next remove the coil wire
Now remove the cap. With cap off crank engine to see what way the dist is going clock wise or counter clock wise.
The firing order is 1-8-4-3-6-5-7-2.
To get the engine on tdc, put your finger over the #1 sparkplug hole and bump the engine. When you feel compression look at the timing marks and turn engine over by hand( this means you need a wrench and a scoket to turn the big nut on the bottom pully)
Turn it untill the timing mark says 0
At this point the moter is on top dead center and all you have to do next is look at where the rotor is pointing in the cap.
Now put the #1 plug wire in that cap
Next just go around eather cw or ccw depending on the engine rotation ,
so next comes 8 the 4 the 3 and so on.
Now you have the wires in the cap correctly and just put #1 plug back in and crank it up.
If it still missess the you have a bad wire or a bad plug.

NOTE just because the plug is new in the box does not mean it is a working one.
Hope this helps and if you need more info, just drop me a email at [e-mail]
Dons Auto

Answer 2

To add some possible help; most engines have the firing order somewhere on the intake manifold, or try pulling one wire at a time from the dist. cap with the motor runing, the ones that make little or no change are your "problem". You may get shocked doing this, but it's the surest way to locate which cyl.(s) is missing, If two of them make little or no change in the idle; then, try swaping them. I'm afraid that if these things don't resolve the problem it's time for a compression test, but that's a whole differant can of worms. I was just reading some of the other answers, and that '65 corn-binder uses #8 cyl. for all timing function instead of #1 like everyone else!

Answer 3

you put the wires on in the wrong order.
Top Dead Center is when Piston number one is at the top of its stroke. There is generally a mark on the Harmonic balancer indicating when the engine is at this point. I do not know the firing order for that vehicle though without knowing what motor is in it. Hope I have been helpful though.

Answer 4

Don is right about new plugs. Awhile back I dropped a new set of Autolites in my 305 (GM , 5Lt V8) because my usual Champions were not in stock.

2 (!!) plugs were bad. With the engine running I pulled plug wires one at a time to locate the misfires and reinstalled the OLD Champs. in their place and ran great! I never tried Autolites again and the Champions have never failed me.

Otherwise your firing order is out of wack and follow Don's advice.

(I'm also a Goldwinger, btw)

Answer 5

Whats TDC have to do with this?????

Probably misfiring because you changed the firing order.....next time, only replace one plug wire at a time, that way you dont cross wires. Now, you need to make sure you get a manual that tellls you the correct firing order...

Answer 6

Assuming you put the wires on one by one, so as not to mix them up, the problem will be in the distributor, i.e. faulty points/condensor, or the timing has been changed (accidently, i am sure) and now you need to use a timing light and dwell meter to set all the ignition specs correctly. As for TDC, the above answers this rather well. Thanks!

Answer 7

Was it miss firing before you fitted plugs and leads?If not it is somthing you have done installing them have you got the firing order correct.Possibly you have damaged a plug insulator hope this helps Mike

Answer 8

Could be you have crossed a wire. Or if you moved the distributor in any way it could cause a mis-fire.

Answer 9

changing the timing belt? There are timing marks on the case, crank, and camshaft(s). in any different case, pull the plug out of #a million cylinder(first one interior the front of the motor vehicle) positioned a protracted screwdriver interior the hollow and turn the engine over manually till finally the screwdriver stands out the main

Answer 10

perhaps you put in the wrong plug wires, which could cause misfirings...put in the olds ones...and see if it stops...also jsut compare the length of the old to the new...