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misfire compression issue


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marcus31
New User

Apr 5, 2012, 12:13 PM

Post #1 of 8 (1600 views)
misfire compression issue Sign In

I have 2002 ford Taurus 3.0 lx. Misfire on 3 and low compression on 2 .. . heater is acting like a/c when I turn on heat normal a/c water comes out where it supposed to for a/c. Are the two connected? what's wrong?


Hammer Time
Ultimate Carjunky / Moderator
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Apr 5, 2012, 12:24 PM

Post #2 of 8 (1587 views)
Re: misfire compression issue Sign In

The compressor runs in defrost so that condensation is normal.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



marcus31
New User

Apr 5, 2012, 12:35 PM

Post #3 of 8 (1580 views)
Re: misfire compression issue Sign In

Ok so does that explain why I'm getting low compression on cyl. 2 and misfire on 3? I thought they might have a relation. The car is sluggish and misfire light keeps flashing

(This post was edited by marcus31 on Apr 5, 2012, 12:40 PM)


Hammer Time
Ultimate Carjunky / Moderator
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Apr 5, 2012, 12:40 PM

Post #4 of 8 (1576 views)
Re: misfire compression issue Sign In

No it doesn't. Totally different problem that needs to be diagnosed though additional testing starting with a leakdown test.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



marcus31
New User

Apr 5, 2012, 12:45 PM

Post #5 of 8 (1569 views)
Re: misfire compression issue Sign In

Did compression test cyl. 2 is 90 all other cylinders read 150. Not sure what leak down test is. Have replaced spark plugs coil spark plug wires.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Apr 5, 2012, 1:35 PM

Post #6 of 8 (1544 views)
Re: misfire compression issue Sign In


Quote
Not sure what leak down test is


Then you need to take it to a shop for further diagnosis.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Discretesignals
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Apr 5, 2012, 6:45 PM

Post #7 of 8 (1514 views)
Re: misfire compression issue Sign In

Squirt a little bit of motor oil into number 2 cylinder and retest. See if the compression reading comes up.





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on Apr 5, 2012, 6:46 PM)


Tom Greenleaf
Ultimate Carjunky / Moderator
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Apr 8, 2012, 5:40 AM

Post #8 of 8 (1465 views)
Re: misfire compression issue Sign In

Yes, yes, yes. Leak Down: Have subject cylinder on TDC, spark plug out the apply air pressure noting where it comes out like thru oil fill cap or throttle body. It's not 100% but leads to the diagnosis of the problem. If you don't have a clue on this you need to send it out for diagnosis,

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