ECU code 42

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Jun 22, 2003 | 05:27 PM

busterray

Thread Starter

Joined: May 2003

Posts: 5

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From: Conway, AR, USA

ECU code 42

I have an 86 CRX Si, 1.5 that has been fuel fouling the plugs. Finally figured out today how to check the ECU codes. The code it is giving is 42: engine coolant temp sensor. Will this sensor make it foul the plugs? Sometimes it will start and run like a champ, other times it will run like shimp. Also, the PGM-FI light on the dash is on. What does this mean?
Thanks guys.

Jun 23, 2003 | 12:03 PM

JimBlake

Honda-Tech Member

Joined: Jan 2003

Posts: 8,132

Likes: 5

Re: ECU code 42 (busterray)

If the ECT is bad, it might run rich all the time if the ECU thinks the engine is cold. If the ECT failed in a way that makes the ECU think it's hot, then the car wouldn't start real easily.