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upgrading to LS coils?


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#1 CGraves

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Posted A week ago

I'm having trouble with my car misfiring really bad about about 2 hours of driving and pulling over for about 15 minutes always fixes the problem so I'm assuming it's the coilpacks can't handle the heat and they start to misfire.

The problem I'm having is I don't want to hang LS coils somewhere in the engine bay so I was going to modify them to be a coil on plug but my question is would that defeat the purpose of the LS coils since they are still in between the valve covers? Or do the heat sinks help them dissipate enough heat to where this isn't a problem?

#2 NewZed

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Posted A week ago

Modern coilpacks (actually all engine bay components) are designed to handle very high engine bay temperatures for 100,000+ miles.  Seems unlikely that they would be overheating.  Might be in the same boat when you're done. 

 

Forgot to say that another reason for overheating might be bad ignition settings.  Too much "dwell".


Edited by NewZed, A week ago.


#3 CGraves

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Posted A week ago

@NewZed

I'm not sure what dwell is or how I would even check that. I'm running a stock RB25 with stock ECU,turbo,boost everything. Timing was set before I left on my trip. If it was timing I don't see why it would happen after 2 hours then stop after it cools down.

Also RB25 coils are notorious for getting hot and the plastic will crack and they will spark off the valve covers.

#4 NewZed

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Posted A week ago

If you're running stock engine control then you'll want to match specs on the the coil so the ECU can handle it correctly.  Thought you might be running Megasquirt.



#5 flatrate

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Posted 6 days ago

make sure engine is grounded well and voltage at coil packs is appropriate when the problem occurs..

 

Those coil pack harnesses are generally pretty brittle if they havent been replaced.






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