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

plissken97 · 15 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 · 11 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

plissken97 · 3 Hours Ago

Hi Crabs, and all the members,

Thanks for your reply.

I double-checked all these hoses, and they are okay. I noticed that when I turn the ignition on without starting the V8, the vacuum pump on the passenger side, near the front right wheel, keeps running continuously; it does not stop.

However, I decided to start the engine, and it runs very well. There?s no SES light, and the car seems to be in great condition, although I haven?t driven it on the road yet due to the bad weather in Paris. I ran another diagnostic test, and there are no more codes.

I am a bit worried about the vacuum pump running continuously.

If anyone has any input, I?d appreciate it.

Thanks a lot et thank you all.

Julien

15 Hours Ago	#1
plissken97 Join Date: Jan 2020 Location: France Posts: 2	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

11 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; 10 Hours Ago at 09:23 PM.

3 Hours Ago	#3
plissken97 Join Date: Jan 2020 Location: France Posts: 2	Re: My first (and last I hope !) backfire Hi Crabs, and all the members, Thanks for your reply. I double-checked all these hoses, and they are okay. I noticed that when I turn the ignition on without starting the V8, the vacuum pump on the passenger side, near the front right wheel, keeps running continuously; it does not stop. However, I decided to start the engine, and it runs very well. There?s no SES light, and the car seems to be in great condition, although I haven?t driven it on the road yet due to the bad weather in Paris. I ran another diagnostic test, and there are no more codes. I am a bit worried about the vacuum pump running continuously. If anyone has any input, I?d appreciate it. Thanks a lot et thank you all. Julien Last edited by plissken97; 13 Minutes Ago at 08:09 AM.