Forums/Z31P/z31-repairs-forums engine-mechanical/Running lean?

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Shutokou561: (2015-10-15 19:27:16)

Hi everyone. I've recently been chasing down and fixing issues with my 86T. I've replaced all the broken or brittle vacuume lines thinking that maybe causing my car to run lean as well as the chts and harness. The previous owner installed a aftermarket fpr with a pressure gauge and the fuel pressure was set to 38psi. Just wanted to get everyone's take on what could potentially be causing this issue.

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Shutokou561: (2015-10-15 19:50:07)

[IMG][URL=http://s781.photobucket.com/user/duhast721/media/Converted_file_04196e1e_zpsmeek7rcl.jpg.html][/IMG]

[archived image: Converted_file_04196e1e_zpsmeek7rcl.jpg]

Here is a picture of the plugs I removed that are barely a month old.

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ralph50: (2015-10-19 17:52:50)

It could be anything. Check fuel pressure at wot and take it from there.

In gas tank fuel filter or mesh?

Fuel filter?

Pump wiring?

Any ecu codes?

Just because you are getting 38 psi at idle does not mean you are getting good pressure at wot where your injector duty cycle is closer to 100%