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Author Topic: Strange miss under 2k RPMS  (Read 937 times)

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czjeeper

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Strange miss under 2k RPMS
« on: April 07, 2009, 08:54:56 PM »
I'm getting a miss and or a backfire through the intake at just about any throttle under 2k rpms.
What would be causing this?
Many times there isn't really any load, IE on a straight flat stretch.
This happens in any gear at any speed.
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Offline Jeffy

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Re: Strange miss under 2k RPMS
« Reply #1 on: April 07, 2009, 09:01:34 PM »
How you eliminated bad gas?
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czjeeper

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Re: Strange miss under 2k RPMS
« Reply #2 on: April 07, 2009, 09:32:32 PM »
I only run Shell, Chevron, or 76.
I also put fuel system cleaner through it every few tanks.
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Offline Jeffy

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Re: Strange miss under 2k RPMS
« Reply #3 on: April 07, 2009, 10:34:38 PM »
Ugh, I haven't had much luck with Shell.  Ping-city the few times I've run it.
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"If the motor car were invented today, there is absolutely no way that any government in the world would let normal members of the public drive one."

czjeeper

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Re: Strange miss under 2k RPMS
« Reply #4 on: April 09, 2009, 11:52:21 AM »
Okay, I just figured something else out.
If it is raining or humid, it gets worse.
On cool, clear days, It barely occurs.
Whatcha got?
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Offline Jeffy

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Re: Strange miss under 2k RPMS
« Reply #5 on: April 09, 2009, 01:19:55 PM »
It's electrical then.  Check all the connections and reseat them.
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"If the motor car were invented today, there is absolutely no way that any government in the world would let normal members of the public drive one."

ClubCreepers

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Re: Strange miss under 2k RPMS
« Reply #6 on: April 12, 2009, 09:37:33 PM »
My Jeep did this... and i got a 90, and i changed the Coil and the Crank sensor... and it was fixed... so really tell ya which was it, but i know it would just die for no reason... and then other times it would run rough... but its all better now...
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Offline Bounty Hunter

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Re: Strange miss under 2k RPMS
« Reply #7 on: April 12, 2009, 10:12:57 PM »
Quote from: czjeeper on April 09, 2009, 11:52:21 AM
Okay, I just figured something else out.
If it is raining or humid, it gets worse.
On cool, clear days, It barely occurs.
Whatcha got?
Can also be a bad coil and/or distributor cap, both are greatly affected by moisture if there are any problems like cracks, etc.
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