I can't figure this one out. I can pull any of the spark plug wires off and the car starts smoking white out of the exhaust. What could cause this. I have read about HC unburnt fuel. Could this be the case. Does it mean that the fuel is loading up in the cylinder. Any input.
white smoke when pulling plug wires
- Thread starter 89supracrazy
- Start date
i actually did this cus rite now my car runs really rough when the engine's warm. so rough that the car doesn't run on its own until i start it a second time and giv it a little gas. i pulled each wire individually because it sounds like a piston isn't firing. so the plug that i pull that doesn't make any change in the engine is the one that needs replacing. turns out that the 5th plug completely kills the engine and the others dont affect performance at all.......
so that means that the 5th plug is the only one working "correctly" if it actually kills the engine.. sounds like you may need a tune up ;-)
Compton74;1693237 said:
He may be looking for knock or doing what's called called a cylinder power balance test, although the right way to do it is short the plug out.
just remembered, that with my n/a, it would run perfect when cold, then when it warmed up, it'd run like sh*t.. started unplugging injectors, turned out one of my injectors was shot when it got warm.. unplugged it, and nothing changed.. maybe you have an injector dying?
jetjock;1693233 said:
Don't have to worry their jj. I have 3" pipe all the way back. Where I live emissions are not enforced.
Yeah, white smoke is normal with unburned fuel. You have to have some combustion to get it black.
You have to realize too that because it is a waste spark, every time you pull one wire off you are killing that cylinder as well as its companion. If you ground the plug out like JJ mentioned then you will only be killing the one cylinder that you are trying to test.
CyFi6;1693513 said:
I believe you are wrong on the waste spark thing. If you pull one wire off the companion will still fire. All waste spark does is as one cylinder is at tdc it fires and the other companion fires on the exhaust stroke. Anybody can correct me if I am wrong.
What concerns me about my ignition system is I tried the 3 volt off the car and on the car igniter test and could not get the power transistors to turn on. My question is would the car still run without the power transistor not working.
jetjock;1693268 said:
it just seemed odd to me, as the way i always did it was by shorting the plug out.
Then you're doing it correctly. What he is doing risks damage to the coil packs.
No, it wouldn't. And the TSRM igniter test procedure, unless read very carefully, won't work. Probably why you couldn't get the thing to trigger.
89supracrazy;1693687 said:
No, it wouldn't. And the TSRM igniter test procedure, unless read very carefully, won't work. Probably why you couldn't get the thing to trigger.
jetjock;1693715 said:
OK. That answers that question. I was reading ismns post about he could not get the igniter to test right and he was testing it wrong. When he tested it right he said everything showed like the tsrm said.