Random Misfire
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Joined: Dec 2002
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From: Savannah USA
Random Misfire
Hello,I am having a rondom misfire on a 99 f250 v10.I have had the dealership run the tests,and all they can come up with is a random misfire...so my question is, Is there any way to test these! Can i buy just one and put it on and have it tested if it corrects it I would leave it, But if not can I put the org.one back on and move to the next one to try and determine which one it is.seeing that i have ten of these this is gonna cost me if you tell me i have to replace all of them! Anyone got any advice on this problem?????
Fleet Mechanic
Joined: Aug 2005
Posts: 1,339
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From: NJ
That is real fun to find without the right equipment, any good dealer should be able to scope it with wds or pds/vcm and find the cylinder. Just running a simple eec test will not help you with this.
Post Fiend
Joined: Jan 2002
Posts: 5,859
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From: USA
Originally Posted by NsaneSider
Hello,I am having a rondom misfire on a 99 f250 v10.I have had the dealership run the tests,and all they can come up with is a random misfire...so my question is, Is there any way to test these! Can i buy just one and put it on and have it tested if it corrects it I would leave it, But if not can I put the org.one back on and move to the next one to try and determine which one it is.seeing that i have ten of these this is gonna cost me if you tell me i have to replace all of them! Anyone got any advice on this problem?????
If you have a DVM(digatal volt ohm meter ) you can measure the resistance of the coil.Best to do it when its hot,this is when they break down.
You may also have a bad sparkplugboot that is alowing the secondary ignition to short to ground or even a sparkplug itself.
Have the sparkplugs ever been changed?
You could have a dirty fuel filter or a bad injecter or dirty injecter
If you can't do any of this find a different dealer or an independent mechanic.
Rich
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