2000 Taurus P0301 Misfire

Daniel Mechanic Congers, New York Posted   Latest  
Question
Driveability
2000 Ford Taurus SEL 3.0L (S) 4-spd (AX4N)
P0301 - Cylinder 1 Misfire Detected
Cylinder 1 Misfire

i switched coil and plug miss didn't follow. my fuel injectors are spraying good and got the right amount of compression i took the upper intake off to put alittle oil into the cylinder to see if it would bypass the valve and the oil stayed didnt leak pass the valves. need some help from here

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Robert Mobile Technician
Newark, Delaware
Robert
 

Can you duplicate the misfire? what scan tools do you have to what scan tools do you have to work with here? If you have Factory Ford or and Alltel have you ran the Power Balance test to verify the misfire? I have I have seen many technicians get burned on these older Ford's by diagnosing the effect and not the cause. I have seen these things shut off fuel to save the cat with just a very slight

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Daniel Owner
Long Beach, California
Daniel
 

Have u check running compression

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Ray Diagnostician
North York, Ontario
Ray
 

Do you have a scope? In the first waveform The blue CH A is a pressure transducer in the tailpipe while cranking and 1 cylinder has a higher exhaust pressure pulse. The red CH B is the relative compression The tan CH D is a pressure transducer in the intake manifold and 1 cylinder has a low pressure pulse In the second waveform, If you scope the secondary and do a brake torque, you could

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Bob Diagnostician
East Longmeadow, Massachusetts
Bob
 

The first thing I would suggest is to verify that cylinder 1 is really the cylinder that's misfiring. On some of the older stuff, cylinders would sometimes be reported incorrectly. You could be chasing your tail.

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Patrick Owner
Baxter, Tennessee
Patrick
 

Check the valve springs, they break often. Surprisingly they will pass a cranking compression test.

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Thomas Diagnostician
Saint Petersburg, Florida
Thomas
 

exactly. using a lab scope or Vantage to check relative compression with a synch will lead the way, then an in-cylinder test for more information...I have run into broken valve springs as well. A compression gauge may look just fine, meanwhile there is a sealing issue that can be detected with a scope.

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Albin Diagnostician
Leavenworth, Washington
Albin
 

Over the years, I have watched many people struggle finding the cause of a misfire. Back to the basics, we need the proper amount of compression, the proper amount of spark at the proper time, the proper amount of fuel injected, at the proper time, and the ability of the cylinder to pump air. In reading your post, I don't see where you addressed any of these much needed things, except the

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James Owner/Technician
Pike, Pennsylvania
James
 

I'm with Daniel here, I would do a running compression test. Best way to check for broken valve spring outside of visual test or using a pressure transducer.

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Ray Diagnostician
North York, Ontario
Ray
 

Daniel, read Albin Moore's post, it is excellent! Ray

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Brin Diagnostician
Melbourne, Florida
Brin
 

I can appreciate you reaching out for help on this one. It can be uncomfortable to do so, but asking for help can be the catalyst for change and bettering yourself. Anyone that knows me knows how passionate I am about training. For me, training helps to remove the pain in the service bays. I found, early on, that there was no tree branch that I could touch after a hard day in the bay that would

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Brian Diagnostician
Seneca, South Carolina
Brian
 

Brin, The points you made are very necessary. If a tech doesn't know how to analyze the data they are seeing, that fine. If they will at least post all the info ( VIN, ALL Codes not just the ones in the module controlling the "problem system", Freeze Frame data , actual results from tests completed eg, voltages, pressures, scan tool used, scan tools available to use), here many top level guys

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Vince Technical Support Specialist
Commack, New York
Vince
 

Daniel are you still at it with this car?

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