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spaded1

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misfire?????
« on: Jul 15, 2009, 06:43:20 AM »
my 85 efi has a little misfire,, what can i do to track it down??? or does anybody have any suggestions on what to do,,, i did just change my plugs???
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jimbo74

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Re: misfire?????
« Reply #1 on: Jul 15, 2009, 06:58:55 AM »
did it have the misfire before you changed the plugs?
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spaded1 [OP]

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Re: misfire?????
« Reply #2 on: Jul 15, 2009, 12:54:44 PM »
yes,, but it wasnt as noticable
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jimbo74

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Re: misfire?????
« Reply #3 on: Jul 15, 2009, 12:57:43 PM »
Quote from: spaded1 on Jul 15, 2009, 12:54:44 PM
yes,, but it wasnt as noticable


then my bet would be bad grounding or bad spark plug wires.... also, check your valves, at oeprating temp, intake @ .008 and exhaust @ .012
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emsvitil

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Re: misfire?????
« Reply #4 on: Jul 15, 2009, 02:01:49 PM »
Bad spark plug wire.    Removing it for the new plugs made it even worse.........

Get out you ohmmeter and check them.
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Ed
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86 SR5 XtraCab
22RE  W56B
31x10.50R15

jimbo74

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Re: misfire?????
« Reply #5 on: Jul 15, 2009, 02:26:30 PM »
Quote from: emsvitil on Jul 15, 2009, 02:01:49 PM
Bad spark plug wire.    Removing it for the new plugs made it even worse.........

Get out you ohmmeter and check them.

that was my initial though, thats why i asked if it was there to begin with..... i did that before :gap:
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:usa:

The cost of freedom is always high, but Americans have always paid it. And one path we shall never choose, and that is the path of surrender, or submission.

~ John F. Kennedy ~

spaded1 [OP]

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Re: misfire?????
« Reply #6 on: Jul 16, 2009, 01:39:37 PM »
how do i check them,, with the ohmmeter
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emsvitil

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Re: misfire?????
« Reply #7 on: Jul 16, 2009, 11:05:45 PM »
Yep, the ohmmeter.

Post what you find
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Ed
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86 SR5 XtraCab
22RE  W56B
31x10.50R15

spaded1 [OP]

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Re: misfire?????
« Reply #8 on: Jul 17, 2009, 06:23:57 AM »
well i really didnt find anything,,there was resistance in all the wires so i went and bought new ones,, but that didnt change anything. im starting to think its valves, because it doesnt misfire when the engine is cold,, it does it when it warms up. am i correct???
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spaded1 [OP]

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Re: misfire?????
« Reply #9 on: Jul 17, 2009, 06:24:37 AM »
also what should my plug gap be ??
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Tim

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Re: misfire?????
« Reply #10 on: Jul 19, 2009, 05:08:36 PM »
google plug gap, but i can remember when i had an EFI i would have that problem once in a while.  i would take off the distributor cap and very lightly remove the white corrosion built up from all the contacts on the 1-4 output and the rotor contact as well.  if might do a lot of good to get a new cap and rotor if all your wires check good but you also should do something about the plug gap. 
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Toydanota

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Re: misfire?????
« Reply #11 on: Jul 19, 2009, 05:39:02 PM »
My 85 efi is doing exactly the same thing as yours. Its driving me nuts!!  I dont know what it is. Did the plug wire thing, spark plugs, ignitor,o2 sensor. Im also starting to think i need a valve job or that it has something to with the injectors. Good luck man, let you know if i get it figuered out
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spaded1 [OP]

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Re: misfire?????
« Reply #12 on: Jul 19, 2009, 06:10:15 PM »
yea i got it figured out,,, my plug gap was too small,, i set the gap to .035 and its running like a dream now
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