testing the ALCL. poor cold start running
 

What are the pins and their location on the ALCL to test for trouble codes? I am referring to the paper clip method. If I remember correctly they are the slots in the upper right corner but I am may be wrong.

I started my z yesterday and not more than 100 feet later the car began to stumble and almost cut off. After warming up it went away and began to drive fine except for a slight bog in 2nd gear under load.

The car has about 68K on the clock and there seem to be a lot of original parts on the car. I have replaced the coils and wires. The prior owner installed new FIC injectors that are ethanol compliant.

Thanks ahead of time!

Re: testing the ALCL. poor cold start running
 

Did you get a Set light? If not, you may not see any codes

Re: testing the ALCL. poor cold start running
 

No SES light.

Re: testing the ALCL. poor cold start running
 

That's where they are on my 82, and I would imagine that they are the same for our Z's....
Not being too familiar with the LT5, I would assume that you start from the beginning. Such as, fuel delivery, spark (ignition), grounds, etc.,etc. If the engine doesn't have a code, you would need to go through each system to narrow down the source of the problem....JMO

Re: testing the ALCL. poor cold start running
 

The ZR-1 is an OBD-1 car. Pins and pulling codes is the same across all vehicles.

Re: testing the ALCL. poor cold start running
 

I assume they are the top two right pin holes, pin A & B?

FEDCBA
G

Re: testing the ALCL. poor cold start running
 

Never mind, I just tested the ALCL and it threw no codes.

Re: testing the ALCL. poor cold start running
 

I am beginning to think I may have a fuel problem

Is there anything specific about the ZR-1 fuel system any care to share?

In particular how the fuel pumps work?

I just connected a fuel pressure gauge and it would not move past 20 psi at idle and it bounced maybe to 25 psi while driving the car.

I think either my fuel filter is clogged or the problem lies within the fuel pumps and or assembly.

I put the gauge on my daily driver Malibu and it held 30 psi so I know the gauge is working.

Is this normal fuel pressure for the LT-5?

Re: testing the ALCL. poor cold start running
 

Karl,

The FP should be in the 43+# range. If you haven't changed the filter, you should do it anyway. You may want to check the pumps. If they are original, it can also be an issue w the plastic clamps in the tank. They may be loose enough so that they lose pressure sort of like a leaky blood vessel. If not that, could be time to change the pumps

Re: testing the ALCL. poor cold start running
 

What XfireZ51 said plus I am surprised that it runs with that low of a fuel pressure. Interesting.:confused: