1990 ZR-1 Issues

[frantinoro]

So, I took off the air setup, and noticed one seemed to leak slightly when sucking, and had a faint taste of gas. Can I just remove the diverter and connect the two together, or do I need to block them individually to delete the air setup?

[XfireZ51]

Originally Posted by frantinoro

So, I took off the air setup, and noticed one seemed to leak slightly when sucking, and had a faint taste of gas. Can I just remove the diverter and connect the two together, or do I need to block them individually to delete the air setup?

If u disable the A.I.R., u also need to tell the ECM u r doing that. So a minor change in the calibration is called for.

[frantinoro]

I was told that this wouldn't affect anything. Either way, I removed the diverter and connected the two together, and it honestly made the right bank more lean, or maybe I'm crazy. I'm open on what to test next. I noticed the cross counts for the left bank were like 10-15, vs the right bank was 0-2.

[richarde]

You said originally that 'I got my zr-1 and it never ran right, but after sitting for a few months it's a lot worse'.
I guess that you purchased it earlier this year. Did you get any history with the car that could point to a resolution? Could it be a mechanical issue that is 'tricking' the sensors?

[frantinoro]

I did not get any history with the car no. I did notice that the INT creeps up ONLY at idle. I changed what I thought was my leaky check valve with a new one and no fix. Although I JUST found out both my resonators are cracked.

[A26B]

Originally Posted by frantinoro

I did not get any history with the car no. I did notice that the INT creeps up ONLY at idle. I changed what I thought was my leaky check valve with a new one and no fix. Although I JUST found out both my resonators are cracked.

BOTH??? resonsators Only one resonator (in the middle) & 2 mufflers @ rear. Are you perhaps referring to the catalytic converters, welded into the exhaust manifolds?

[frantinoro]

Hi, yes both. I have a Corsa cat back. I doubt that would cause my issues though. What should I test next? I'm really stumped.

[XfireZ51]

If resonators are leaking they could suck fresh sir into the exhaust which could impact the operation of the O2s.

[frantinoro]

Even though they're like 3 feet downstream?

[XfireZ51]

Originally Posted by frantinoro

Even though they're like 3 feet downstream?

Its happened to me with a leak at the muffler. Idle and Decel are two pointa where engine vacuum is at its highest. It can pull fresh air past the O2s creating a “false lean” condition. That in turn will cause the ECM to richen the AFR.