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HybridZ

My car is running to rich.


Guest dammit

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Guest dammit

I am having trouble with my 280zx.I rebuilt a motor for it and I used a '75 head with an '80 block.My problem is when I start it up it runs fine'but if I try to go above 3000 rpms or so.The motor gets to much gas and it stalls.It was suggested to me that it might be the cold start valve.If anyone has a suggestion.Please let me know.Also I am using a big bore throttlebody.

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  • 3 weeks later...

I just bought a z that was running really rich and went through alot of trouble to find the problem. Unfortunately, the problem was the last thing that I checked. I finally pulled out the fuel pressure gauge and found my fuel pressure was at 55 psi. It turned out to be the fuel pressure regulator which was stuck shut and needed to be replaced.

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