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04-27-2007, 09:33 PM
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#1 | |
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AF Newbie
 Join Date: Apr 2006
Location: french camp, California
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mis fire problem
 Check engine light comes on so i read the code ,misfire 4 and 6 ,also had a slight miss ...put new wires on cause i saw where 4 and 6 had been rubbing .thought for sure that was it .nope ,still got a mis .replaced 4 and 6 fuel injecter .replaced 4 -5 -6 plugs . Still got a miss ,...any suggestions please. |
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04-27-2007, 10:08 PM
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#2 | |
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SHO No Mo
 
Join Date: Jun 2004
Location: Cedar Rapids, Iowa
Posts: 10,996
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Re: mis fire problem
What year and which engine? Do cylinders 4 and 6 share a coil?
-Rod |
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04-28-2007, 12:05 AM
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#3 | |
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AF Newbie
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Re: mis fire problem
96 4.0 pushrod -and no 4 and 6 do not share same coil
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04-29-2007, 01:10 AM
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#4 | |
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SHO No Mo
Join Date: Jun 2004
Location: Cedar Rapids, Iowa
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Re: mis fire problem
You may want to check the compression of the cylinders to see how similar 4 and 6 are to the rest of the cylinders. As you are probably aware, you need 3 things for the cylinder to fire properly, good compression, proper air/fuel ratio, and good spark in proper timing.
Also, did the plugs from cylinders 4 and 6 look different from 5? Were they moist? -Rod |
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04-29-2007, 02:07 PM
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#5 | |
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AF Newbie
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Re: mis fire problem
the cylnder 5 plug looked new and 4 was a little rusty colord and 6 was dry like it was nt getting fuel .so anyway i found a fuel leak ,i had mashed a couple o rings on the rail to injector ,fixed that and the check engine went out but still have a rough idle.
Last edited by procrstinator; 05-18-2007 at 05:07 PM. |
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05-18-2007, 05:09 PM
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#6 | |
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AF Newbie
Join Date: Apr 2006
Location: french camp, California
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Re: mis fire problem
ok, its still has a rough idle only everything else is ok .the code reader isnt reading a mis fire anymore it now reads a code for lean bank ,any help?
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05-18-2007, 05:40 PM
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#7 | |
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SHO No Mo
Join Date: Jun 2004
Location: Cedar Rapids, Iowa
Posts: 10,996
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Re: mis fire problem
Sounds like you probably have a vacuum leak, air entering after the MAF sensor, or an EGR issue (DPFE maybe).
-Rod |
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05-19-2007, 07:18 PM
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#8 | |
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AF Newbie
Join Date: Apr 2006
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Re: mis fire problem
isnt there a code for faulty EGR?Ill check for leaks i guess.Ill let you know what comes up .Thank you for your help,oh and BTW what is DPFE?
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05-20-2007, 11:40 AM
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#9 | |
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SHO No Mo
Join Date: Jun 2004
Location: Cedar Rapids, Iowa
Posts: 10,996
Thanks: 105
Thanked 358 Times in 349 Posts
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Re: mis fire problem
There are some codes for EGR issues, but the code will only be set if the problem is gross enough.
DPFE is Differential Pressure Feedback EGR. This sensor monitors the position of the EGR valve with respect to where it thinks it should be. Some of the parts stores refer to it as the EGR position sensor. -Rod |
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