GTS-T bucking/hesitating before it builds boost

[planrforrobert]

Stock MAF

[planrforrobert]

Just blinked out the codes using the instructions in this link: http://www.gtr.co.uk/forum/123312-reading-ecu-fault-codes.html

5 long blinks, 5 fast blinks: No Malfunction

Time to turn my focus to the fuel system?

 

[planrforrobert]

Am I not able to edit posts after a certain period of time?
 

At any rate, I will be testing fuel pressure at at the rail tonight or tomorrow, how much pressure should I see? 3 kg/cm2 (42psi)?

Edited November 7, 2016 by planrforrobert

[blind_elk]

Stock FP readings should be:

@ ignition switch ON:   approx 3.0 kg/cm2

@ Engine idling:   approx 2.5 kg/cm2

@ idling, disconnect vacuum hose at FPR:   approx 3.0 kg/cm2

[m35stagea]

In for diagnosis. Mines car is hesitating and feeling crap in vaccum. If i jump on accelerator from idle it hesitates at wot its fine to drive.

[planrforrobert]

A known good CAS landed at the shop today, installed it correctly...no change.  Will still crank and crank but no start.  Will be checking fuel pressure as well as testing to see if I have spark going to the coil packs tomorrow night.

[planrforrobert]

So, progress!

Pushed the car into the shop tonight and was set on confirming I had spark and fuel. Started with fuel. Pulled feed line off fuel rail...it's dry. Did some testing of the pump wiring and everything pointed to the fuel pump being bad. To confirm the wiring wasn't the issue we pulled the pump out:



Used a power probe to try and run the pump out of the car, it's dead. I'll get a new pump on order and (hopefully) finally get to enjoy my car.

[admS15]

You may want to flush that tank out too. Rust is a sign of water being in the there at some stage. Probably a good idea to also check its condition, especially if its a steel tank. 

[R33gtst2016]

How is the progress ? Any changes since replacing the pump?

[planrforrobert]

The new pump arrived yesterday and I will be installing it tonight or tomorrow.

[planrforrobert]

So that's how a properly-fed RB should run, haha.

New pump and tank gasket install was a breeze and the car fired up first try. It's like driving a brand new 25-year old car.  Throttle response is there and it pulls pulls pulls.  Thanks all for the help/insight suggestions!

[R33gtst2016]

Good to hear, mine is going they similar stage I started with the coil pack and did plugs too but not really much change, what kind of pump you get? And how much was it ?

[planrforrobert]

Good to hear, mine is going they similar stage I started with the coil pack and did plugs too but not really much change, what kind of pump you get? And how much was it ?

I went with this pump:


Any Walbro 255 or similar pump will work, and wiring is very straightforward. I am by no means a savvy mechanic, but install took me about 45 minutes (and that included cleaning surface rust off the sending unit). Make sure to replace the tank seal if you're in there.

[R33gtst2016]

I've got the pump but struggling to find a gasket anywhere, any ideas?

[planrforrobert]

It's the same as an S13 240sx. I found one here stateside at a local chain parts store.

[planrforrobert]

It's the same as an S13 240sx. I found one here stateside at a local chain parts store.

[R33gtst2016]

Or is it not a gasket just sealant ?

[planrforrobert]

It is a rubber gasket, not sealant.

[planrforrobert]

It is a rubber gasket, not sealant.

[planrforrobert]

To be clear, mine is an R32 GTST. I just realized I never made that distinction.