Main PFI relay location

ALEXANDER KOVER

MEMBER
1993 HONDA DEL SOL
4 CYL
FWD
MANUAL
11,000 MILES

Several years ago I became aware of a common issue with Honda starter relays in hot weather. The engine turns over just fine but it fails to fire. I believe that I developed this problem when I moved to Philadelphia from Buffalo. Where is this relay under the dash, so that I can spray it with a CO2 fire extinguisher to cool it down the next time it happens?

1 Reply

KHLOW2008

MECHANIC
41,814 POSTS

Hi Alexander Kover,

What you are referring to is no the starter relay. It is the Main PFI relay

It should be the PGM-FI main relay that you are referring to. The problem with the relay is that some soldered circuits are cracked and intermittently fails due to the weather.

Here is a guide to help test it with the location below.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.

Image (Click to make bigger)