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5th Gear Harmonics and P0300 - Does it Get Worse over Time?

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Old Apr 16, 2008, 01:48 PM
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5th Gear Harmonics and P0300 - Does it Get Worse over Time?

Gooood afternoon,

After digging through pages of awesome threads on P0300, which I should say answered 90% of my questions, I am left with one thing to decide.


I rarely get the P0300 code in 5th, which according to research is the Harmonics falesly sending the misfire code and has the car pull timing, etc.

Rarely is.. maybe once every other week. Usually only happens when i'm driving a little too fast on the highway.



Now, I just dropped thousands on suspension and a new transfercase. Should I bother having my shop fix the 5th gear (which, along with labor and replacing some synchros & forks will cost me around $1000)?

The tranny itself gives me NO other problems. Will this problem get substantially worse? Should I suck it up and spend more money?

Last edited by Solo II Evo; Apr 16, 2008 at 02:53 PM.
Old Apr 16, 2008, 06:50 PM
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Anyone?
Old Apr 17, 2008, 07:16 AM
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*crickets*
Old Apr 17, 2008, 07:25 AM
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you only get P0300 when are you are IN 5th? I thought the output shaft from 5th vibrated and could cause P0300 even when out of gear too.
Old Apr 17, 2008, 07:26 AM
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I don't believe spending 1K to possibly prevent the 0300 code form coming back is a good idea. It isn't guaranteed to actually fix the issue.
Old Apr 17, 2008, 10:51 AM
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Really...

Pretty good suggestion then. Considering I have it so infrequently.. hmmmmmmmmmmmmmmmmmmmmmmmmmmmm


Thanks for the post man.
Old Apr 17, 2008, 10:53 AM
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Originally Posted by hokiruu
you only get P0300 when are you are IN 5th? I thought the output shaft from 5th vibrated and could cause P0300 even when out of gear too.


Yep, it only happens in 5th, and when I'm usually driving pretty hard (not even every time, at that..). I went all over the place yesterday and stabbed the gas in 5th at 40mph, 50, 60, 90, etc. Could not get it to vibrate. I also eased into the throttle at those speeds and again, couldn't get it to throw the code.




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