My first (and last I hope !) backfire - ZR-1 Net Registry Forums

plissken97 · 9 Hours Ago

Hi guys,

I'm Julien, I live in France and I owned for 4 years now a beautiful black 1990 ZR-1.

I made this backfire last friday...
My SES light came on.
I got 3 fault codes after my diagnosis : H33 H45 H65.
I solved 2 codes which were the H33 and H65 by putting in place the MAP sensor hose at the back of the plenum.

Unfortunately, it remains my SES light with a H45 code.
It says "Oxygen Sensor (System Rich)".

Can you help me to solve this issue ?

Thanks a lot.

Julien

tccrab · 5 Hours Ago

Julien:

The backfire might have popped off the pvc hoses when it popped off the hose on the Map sensor.
Also check the fuel regulator vacuum hose, it lives on the bottom of the fuel pressure regulator.
And your Map sensor might be still leaking a little, especially if the hose has gotten soft over the years.
If the Map sensor isn't working right, it will cause the motor to run rich will cause the codes you're still seeing.

https://www.jerrysgaskets.com/hose-m...ew-90-95-13d4/

Crabs

9 Hours Ago	#1
plissken97 Join Date: Jan 2020 Location: France Posts: 1	My first (and last I hope !) backfire Hi guys, I'm Julien, I live in France and I owned for 4 years now a beautiful black 1990 ZR-1. I made this backfire last friday... My SES light came on. I got 3 fault codes after my diagnosis : H33 H45 H65. I solved 2 codes which were the H33 and H65 by putting in place the MAP sensor hose at the back of the plenum. Unfortunately, it remains my SES light with a H45 code. It says "Oxygen Sensor (System Rich)". Can you help me to solve this issue ? Thanks a lot. Julien

5 Hours Ago	#2
tccrab Join Date: Oct 2004 Location: Folsom CA Posts: 1,650	Re: My first (and last I hope !) backfire Julien: The backfire might have popped off the pvc hoses when it popped off the hose on the Map sensor. Also check the fuel regulator vacuum hose, it lives on the bottom of the fuel pressure regulator. And your Map sensor might be still leaking a little, especially if the hose has gotten soft over the years. If the Map sensor isn't working right, it will cause the motor to run rich will cause the codes you're still seeing. https://www.jerrysgaskets.com/hose-m...ew-90-95-13d4/ Crabs __________________ TomC '90ZR1 #792 Honorary Pirate [B]If it ain't FUN, you're doing something terribly WRONG. [/B] Last edited by tccrab; 4 Hours Ago at 09:23 PM.