1995 Honda Prelude Too RICH!

TRENT94

MEMBER
1995 HONDA PRELUDE
4 CYL
FWD
MANUAL
150,000 MILES

Well, its a 95 si prelude that came with h23 in it. The guy blew it, and swapped it with a jdm h22a. The car has a blown main relay I think because the fuel pump will not turn on. But he said when it was running, it was so rich it wouldnt hardly even idle!It has a chipped h22 ecu in it running single-wire vtec, and h23 wire harness. He said the h23 had a coolant sensor I believe somewhere on radiator or something, and h22 has one on motor. So instead of jus running the one he is supposed to, he is running both of them at the same time! Which sounds like a big problem! The ecu however uses the check engine light as a shift light now, so im not sure is the engine light still works for normal operation or not! Anyway, I really need to get this thing running as quickly as possible, so I hope its not in any wiring somewhere! Please help!

1 Reply

KHLOW2008

MECHANIC
41,814 POSTS

When replying please use the reply to question in post so that notification can be sent to the person attending to you and a history of what had transpired is in the same thread for reference. Posting a new thread might get missed and not replied to due to the overhelming amount of questions coming in.

No matter what, the engine would recognise a signal from the ECT any if you rig 2 to the same circuit, it would get conflicting results and if the result is of a cold engine, the response would be a rich running operation.

ECT is located on cylinder head just below the distributor. The sensor on the radiaotr is the fan switch and that cannot be linked to the ECM as the sensor is not a resistance type but an ON/OFF switch. It operates the the radiator fan relays.

How did they rig the MIL to be the shift indicator
light?

Without the MIL to diagnose, how are you to know what component/system is malfunctioning?

It definitely is a wiring problem that you need to sort out. The worst thing to do is to get someone who does not follow procedures to do modifications. If he were to leave you high and dry, there would be nobody to help you.