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Intermittent “FISHBITE” type misfire or chuggle in the 1994-1995 GM 6.5

BigArt

BigArt

In for the long haul
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Location
Winnipeg, MB, Canada
Last week I had the infamous fishbite described above in my title. I searched and checked and came up with just as Heath discribed in; http://blog.heathdiesel.com/2005/06/intermittent-fishbite-type-misfire-or.html

So I took the intake plenum off, took the existing harness out pic below;

106394_1.jpg


Then went to the stealer with it. They did not have it in stock and no one in the city did either. So ordered one that came in yesterday. In the mean time I put everthing back together after cleaning and dielectric grease applied, on as many connections I could get to and you know what, NO MORE FISHBITE!

And I reinstalled the Turbo Diesel cover on top of the motor at the time as well. It's been taking up space in the garage for years. It looks good!

So what do you think? Should I spend the $135.00 at the stealer for a new one and install it anyway? I know Heath sells it for $95.00 USD, but with the exchange to CAD, shipping, customs, etc. I don't think I would much ahead.

Cheers,
Art
 
If you're worried about using your radio on AM then you should put it back in, otherwise leave it out. Later models didn't even come with one as GM realized it wasn't neccesary for the engine to function.
 
Are you saying I just take it out and connect directly to the top of the IP? I know it will connect, I tried. But put the old one bcak in anyway.

Art
 
Lots of people just took 'em right out. The filter really was to keep the RF strays from interfering with the operation of the IP timing, but the PCM handles most of that, and for most people, it's not necessary. The OBD-IIs had a supression circuit built-in, and some of the early ones still came with a harness (which made NO sense, but...)

My thoughts: if the fishbite is gone, you're golden. It ain't broke, so don't fix it.

If the fishbite comes back, try running it without the filter harness. I bet you'll be fine.
Jim
 
Thanks guys. That's what I'll do. I'll save my $ for a bottle of scotch or 2. (I like good single malt scotch) :thumbsup:

Regards,
Art
 
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If it worries you enough a substitute that is supposed to work is getting a few pieces of ferrite core from radio shack and cable tying the halves of the core around each of the 3 wires of the OS harness.

The ferrite core is supposed to do the same RF absorbing job that the OS filter harness did.

I have not had a need to try this but have read reports of it being a satisfactory option.

In most cases though the OS filter harness is completely omitted with no problems.
 
Is this part required for the OBD I 1995-94 systems? OBDII is said to have it built in per above.
 
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