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Old 10-24-2012, 12:18 PM   #1 (permalink)
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Default PO306 MISFIRE 3.0L Vulcan

I am having trouble with my 2000 Taurus wagon. If you baby it, you can drive it but it sputters sometimes. It seems to do it under a load like going up a hill or on the throttle hard. Spread out over the past year I have replaced the plugs, then the coil pack and just recently the wires and I only did the wire since the misfire started. It is to the point that the check engine light will flash.
I pulled all the plugs and did a compression test
#1 = 165
#2 = 150
#3 = 165
#4 = 155
#5 = 155
#6 = 170 <-- smelled fuel
I smelled fuel as soon as I pulled the flug out of the # 6 cylinder.
I used a scanned and it says I have a misfire in #6.

What do you think, bad injector?

All of the plugs looked ok, kind of an oranginsh color but they have some miles on them
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Old 10-24-2012, 01:59 PM   #2 (permalink)
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Check long term fuel trims on both banks at idle and at 50 mph cruise, and report back with the numbers. I am thinking a intake gasket vac leak on #6. Could be stuck injector on #6, but bad vac leak causing fuel to not burn because A/F is wacked would also result in unburned fuel / gas smell at #6.

Dont drive it with a flashing CEL unless you want to end up replacing the bank 2 cat for big $$.
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Old 10-24-2012, 02:06 PM   #3 (permalink)
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You can test for a stuck open injector by checking if the fuel pressure drops after turning off the car. It really shouldn't drop at all when you shut the car off. If it drops quickly (within a few minutes, or few hours), that can indicate a stuck open injector.
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Old 10-24-2012, 03:18 PM   #4 (permalink)
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Jeff K, how do I check the long term fuel trims? Will the scan tool give me that? The one I am using is borrowed because it is better than mine so I do not know its capabilities.
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Old 10-24-2012, 04:47 PM   #5 (permalink)
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Scan tool will give you LTFT and STFT if it has the capabilities. My scan tool shows me them. If it shows fuel trims, it will show pressure too! So check for a leaky injector while you have the scan tool on! I don't actually know if it will give you a reading with the engine off though, so I may be wrong there. Could key on the engine off and then wait. Schrader valve on the fuel rail is the other way to do it.
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Old 10-25-2012, 12:10 PM   #6 (permalink)
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Just to give an update, I put a new injector in #6 as a precaution since I have to drive the car every day. That wasn't it. Pulled the # 6 plug wire while it was running and no change. Then I pulled #5 & #4 one at a time and there was an obvious differance. I will read up on this scan tool but I guess its looking like some type of vacuum leak or maybe bad valve?
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Old 10-25-2012, 05:49 PM   #7 (permalink)
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Pull the plug wire off and make sure you're getting a good spark. You should get it to arc about an inch or so or use a spark tester set to 25-30kV. Here's how to do it with a test light.


You have good compression, so it's probably not a bad valve. The extra fuel in the cylinder probably increased the compression a little bit.
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Old 10-25-2012, 05:57 PM   #8 (permalink)
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While #6 was off I stuck an old plug in it and it appeared to get a good spark.

Here is what I got while driving home. The number fluctuated all over the place
ST FTRM1 (%) = 0.0 / -1.6
LT FTRM1 (%) = 0.0 / 1.6
ST FTRM2 (%) = 2.3/5.5/8.0
LT FTRM2 (%) = 17.2 / 15.6 / 16.0

When the CEL started flashing the ST numbers jumped up to 13 for FTRM1 & 15 for FTRM2
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Old 10-25-2012, 06:24 PM   #9 (permalink)
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Quote:
Originally Posted by lightning351 View Post
While #6 was off I stuck an old plug in it and it appeared to get a good spark.
This isn't a sufficient test because it doesn't stress the coil enough. It might spark fine in open air but under compression is a different story. Do the test so you can be sure.

Unfortunately the high fuel trims don't help much in this situation because they could be the result of no ignition, no fuel, or a vacuum leak.

It's interesting the fuel trims on bank 1 come up when it starts misfiring. That might point to a fuel delivery or coil problem.
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Old 10-25-2012, 08:54 PM   #10 (permalink)
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I will do the coil test. I will also double check the trims. Its hard to drive, read the scan tool and write notes all at the same time :-)
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