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  #1  
Old October 5th, 2014, 09:04 AM
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Jason England
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Misfire mystery

I have a mild misfire ... Bizarrely enough this has coincided with me getting the best gas mileage I've ever got!

Coil is genuine Bosch and new.

Leads, cap coil are all good.

I haven't pulled the plugs yet..

Ideas?
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  #2  
Old October 5th, 2014, 10:23 AM
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What conditions does it misfire?
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  #3  
Old October 5th, 2014, 10:25 AM
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Jason England
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Driving ... You feel it more under load.
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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  #4  
Old October 5th, 2014, 11:41 AM
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aftermarket wires ? if not sticky valve syndrome comes in at 30k-60k intervals
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  #5  
Old October 5th, 2014, 11:45 AM
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There is a bad batch of Bosch coils going around. Me and a local buddy both got one.
If yours is recent it could be one of the bad ones.
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  #6  
Old October 5th, 2014, 04:53 PM
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Got worse today after driving for a while. Definitely seems related to temp.
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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  #7  
Old October 5th, 2014, 08:10 PM
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Will you be around this week? We can take a look at it one night after work.
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  #8  
Old October 5th, 2014, 10:37 PM
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Yeah I'm around all week. Another a set of eyes on it would be great! Let me know what works as traveling to Canada later in the week.
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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  #9  
Old October 7th, 2014, 07:32 PM
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And it's fixed. Thanks Jimmy!
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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  #10  
Old October 7th, 2014, 07:43 PM
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Quote:
Originally Posted by leastonce View Post
And it's fixed. Thanks Jimmy!
Solution?
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  #11  
Old October 7th, 2014, 08:23 PM
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WTH what was it?
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  #12  
Old October 7th, 2014, 08:53 PM
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Dry electrical connection.
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Quote:
Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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  #13  
Old October 7th, 2014, 09:41 PM
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Quote:
Originally Posted by leastonce View Post
Dry electrical connection.
what is a dry connection?
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  #14  
Old October 7th, 2014, 09:43 PM
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Prolly auto corrected version of "dirty"
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  #15  
Old October 7th, 2014, 09:50 PM
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Quote:
Originally Posted by leastonce View Post
Dry electrical connection.
That's typically a good thing! We found some slight corrosion on the connector for the ignition amplifier module. I was watching his scan tool as he was driving and saw some 'glitch' type readings, so he got some contact cleaner a dielectric grease and started pulling connectors. That was the only one with any signs of corrosion, and after cleaning it, the truck ran much smoother.
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  #16  
Old October 7th, 2014, 10:17 PM
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nice job!
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  #17  
Old October 7th, 2014, 11:11 PM
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Using the term dry as in dry solder joint where the connection is bad.

I cleaned TPS, coolant temp, fuel temp, ignition connections at the MAF sensor connectors with electrical cleaner then dolopped a splodge off dielectric grease to keep them clean.

Was surprising how it ran so much smoother.
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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  #18  
Old November 18th, 2014, 08:39 AM
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Jason England
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And it's back ... It's definitely worse when warmer. Appears to disappear at higher revs ... From 3-4k.

I did get a few pops in the exhaust accelerating from slow speeds in high gear.

Coolant temp seems ok but maybe I'm running the engine a bit on the cool side at about 80 Centigrade. Or 176F.

O2 sensors have not been replaced and maybe next on the list.
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Quote:
Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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  #19  
Old November 18th, 2014, 08:58 AM
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Did you ever pull the plugs?

I worked on a P38 that had a misfire on Cyl 8. Ended up being an improperly gapped plug. Brand new OEM plug too.

Dunno, just thought I'd throw out a cheap and easy thing to check.
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  #20  
Old November 18th, 2014, 09:51 AM
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If it's worse when warmer, I blame the ignition amplifier. Especially if it's been replaced with something cheap at some point.
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