S2000 Under The Hood S2000 Technical and Mechanical discussions.

Misfire Thread

 
Old 03-25-2009, 11:01 AM
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GOD!!!!!!!...I'm having this issue now...hopefully its not bent valves...roughly how much would changing my valves cost me...any input would be great...THX

-Chris
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Old 03-25-2009, 11:20 AM
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Originally Posted by 9KGHOST,Mar 25 2009, 11:01 AM
GOD!!!!!!!...I'm having this issue now...hopefully its not bent valves...roughly how much would changing my valves cost me...any input would be great...THX

-Chris
I was worried about my random misfire -- So I got my engine checked yesterday (valve adjustment) and everything was fine.

The best thing to do is to start small and go from there.
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Old 03-28-2009, 07:08 AM
  #13  
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how the hell does this happen at 20k miles? i have p0300, p0301 and p0302. i put over 500 mi on the car last weekend and it ran perfectly...now all of a sudden i get this crap...here goes my saturday.
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Old 03-28-2009, 08:08 AM
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awesome i reset the ecu and it doesnt even go off
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Old 03-28-2009, 04:19 PM
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I'm having the same problem right now. My mechanic found that my fuel pressure was low so I'm gonna replace the fuel filter to see if that does anything. My compression came out ok and I already changed spark plugs so we'll see what happens.
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Old 03-28-2009, 06:01 PM
  #16  
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^^ If you didn't know...the fuel "filter" is about like a cheese cloth sock on the fuel pick-up in the fuel tank. It's not likely that it is the problem.

[EDIT] I'll retract the above statement. We have found that low fuel pressure can be a misfire cause. See reason #1 for the clogged fuel pump or fuel filter.
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Old 04-04-2009, 07:06 PM
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any other solutions? just changed injectors and still on!

so far, plugs/coils changed, injector cleaner, injector changed, no compression test yet though...
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Old 04-05-2009, 04:39 AM
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My 2002 started having misfires across all cylinders about 2 years ago. I took it to a local mechanic and he tried everything stated in the OP as well as a valve adjustment. None of that fixed it. He gave up and I gave in and took it to a Honda dealership.

They immediately diagnosed it with a faulty throttle body sensor; at idle it was sending a incorrect voltage to the ECU. Once the TB was replaced, everything ran smoothly. Have not had a problem since.
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Old 04-05-2009, 06:05 AM
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Originally Posted by IlleztImportz,Apr 4 2009, 10:06 PM
so far, plugs/coils changed, injector cleaner, injector changed, no compression test yet though...
Compression should have been tested before trying the coils & injectors. Get it checked and report back.
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Old 04-05-2009, 06:07 AM
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Originally Posted by Tom_B,Apr 5 2009, 07:39 AM
They immediately diagnosed it with a faulty throttle body sensor; at idle it was sending a incorrect voltage to the ECU. Once the TB was replaced, everything ran smoothly. Have not had a problem since.
Interesting...haven't heard that one before. The symptom I've generally seen from a bad TPS has been that the RPMs just fall flat at around 3k.

But I'll add this to the list since it is easy to check.
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