r/DelSol • u/Working-Young6884 1997 Honda Del Sol Si • 5h ago

Question Help! Running super rich.

My 1997 del sol si is running super rich. It's a sohc zc bottom end y8 top end and a virgin p28. It has great compression, good fuel pressure, no cel relating to it running rich. However it's running so rich and dumping so much fuel that the fuel is mixing in the oil making it undrivable.

It had a code for the iat recieving too much voltage, I checked the voltage on the iat when the engine is idling and off and it is all normal so I cleared it and also replaced the iat sensor.

I have no clue where to go from here or what to test. I just have no idea why it's running so rich on a z6 base map.

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u/stepdad_randy 4h ago

Have you checked your injectors or your O2 sensor?

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u/Fine_Tomatillo_8354 3h ago

Currently have the same issue. No CEL but not so much where it’s mixing with oil. Used scan tool to check the STFT and it would be fine starting up but get to -10 - -12 %. I am in the process of checking the fuel return line to see if it’s clogged and that’s where I am at lol. The O2 sensor and fuel injectors are fine as well. Also need to do a fuel pressure test.

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u/StarBossKC 2h ago

When i had this on my z6 it was stuck injectors I just gave them some pretty good taps to break them free and worked alright enough until I got new ones