#3 cylinder problem

[capowered240]

I went to change out the injector today because there was like a little puddle gas on top of #3 piston. So I change the injector out. Put everything back together. I start it back up for alittle while then shut it off. Pull #3 spark plug out and there is still gas on top of the piston.

So what I do is start it up (sounds like it is mising real bad) and pull all the coilpack connectors off one by one with the engine running. All of them except for #3 made a difference.

So I do the same thing with the fuel injector connectors. I pull all of them off one by one with the engine running. All of them except for #3 made a difference.

So I start testing all fuel injector connectors, injectors itself, coilpacks, coilpack connectors. Everything tested good and working properly. All spark plugs are getting fire.

Also did a compression test.

#1- 155#2- 160#3- 160#4- 165

I just can't figure out why when I pull the injector connector and coilpack connector on #3 it doesn't make any difference.

[ceniack]

sounds like your injector may be stuck open, try keeping the injectors out of the manifold but hooked up and cranking the motor with the coil packs disconnected to check for a leak.

[float_6969]

I'll bet you've got a bad ignitor or coil pack. Try moving the #3 coilpack to a different cylnder. The car will still prob run rough. If it does, try pulling the plug off the #3 cylnder again and see if it still doesn't make any difference. If it doesn't then it's the ignitor or the injector. If kills the motor/makes it run worse, plug it back and and pull the plug to the coil pack you moved. If it doesn't get worse now, then it's the coil pack.

If that all tests out OK, then try moving the injector around to another cylnder and see if the fuel puddling moves with it.

I'll still bet it's a bad coilpack though. Next guess would be the ignitor, last would be the injector.

[capowered240]

I also did that, I moved #3 coilpack to #4 and #4 to #3 and pulled #3 and still didn't make a difference. I'll try that next, move the injector around to another cylinder. Ecu is throwing 55. Well I know all the coilpacks are working because all spark plugs are getting fire. I had an extra ignitor that I had gotten along time ago, switched it out and still no difference.

[boost_boy]

I'll bet you've got a bad ignitor or coil pack. Try moving the #3 coilpack to a different cylnder. The car will still prob run rough. If it does, try pulling the plug off the #3 cylnder again and see if it still doesn't make any difference. If it doesn't then it's the ignitor or the injector. If kills the motor/makes it run worse, plug it back and and pull the plug to the coil pack you moved. If it doesn't get worse now, then it's the coil pack.

If that all tests out OK, then try moving the injector around to another cylnder and see if the fuel puddling moves with it.

I'll still bet it's a bad coilpack though. Next guess would be the ignitor, last would be the injector.

I like Ryan's next guess in that it could very well be the ignitor. They are notorious for taking-out one cylinder and it's usually #s 3 or 4 that appears dead. Remember, injectors don't just drop dead unless there's a really good reason like an electrical surge from the alternator or it getting physically destroyed. And though they do go bad, they usually leak instead of completely failing. And besides if you had a bad injector, somewhere along the way you would've toasted that piston. Go for the ignitor!!!!!!!!!!!!

Dee

[float_6969]

Are you sure that the ignitor that you have as a spare is good?

[capowered240]

But I'm getting fire at all spark plugs. i would think that if the ignitor was bad, I wouldn't be getting fire at one of the cylinders.

[capowered240]

Is there any way to test the ignitor?

[boost_boy]

Never tested one, just threw 'em away because they are solid state and not worth screwing around with. There are a wealth of bad parts that people are unloading upon each other, so beware. If you're sure the ignitor is good or suspect that it might be good, check the ignitor's connectors at both ends. And lastly, and though it might pertain to you, on one of my Taurus SHO cars, the #6 injector was being held open by the ecu. After spending days of rinsing down my cylinder walls and running raw fuel through my exhaust, I bought another ecu and the problem was solved.

Dee

[capowered240]

Is there anything else I can test or do to figure this out.

[capowered240]

I'll try that next. Well when I pull #3 spark plug out, It still looks brand new straight out of the box. All the others look normal. It seems like something is blowing out the spark or something. Spark plugs are gapped .032.