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Misfiring when hot.

 
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Old 07-07-2014, 06:31 PM
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Misfiring when hot.

Ok, so i swapped out the ECU on my 00 prelude and it fired right up and idled smooth. Took it for a drive and it started missing and barely idling. Let it cool off, fired it up and it ran fine again, until it warms up.

Getting a flashing check engine light with codes P0301, P0302, P0300. The codes mix and match depending on the mood. Live data shows fuel trims to be normal. Fuel injectors aren't dirty or leaking, compression is fine. Took the EGR off and it was pretty dirty, so I cleaned it and it seemed to help a little bit. Swapped out the coil to no effect, crank/tdc are new, MAP sensor is new. Any ideas?

Edit:

It doesn't seem to do it over 3K RPM.
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Old 07-07-2014, 06:51 PM
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Re: Misfiring when hot.

Think I found it. EGR solenoid is applying vaccum at idle. Unplugged it and it smoothed right out.
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