R32 Gtr Stalling

[semislickR32]

Hi,

I know this is impossible to diagnose from the comfort of your PC, and it will shortly be going to the workshop to figure out, but I have a stalling problem with my R32 GTR and was hoping someone could say "ah that's the XYZ thing they all do that just do X and it'll be fine"

Symptoms are:

• On cold start, idles mostly fine but drops every 2-5 seconds (sounds like a lost sheep: baaaaaaaaaaaaaaa baaaaaaaaaaa baaaaaa baa baaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa )
  
• Never misses a beat on 20%+ throttle - smooth and still pulls hard on full throttle
  
• When it gets warm (ie 70deg+) it starts occasionally losing power and stalling when idling (eg when clutch-in upon stop). Pumping accelerator before it actually stalls revives it and it keeps on running until the next time
  
• Once it starts, it will quite often do the same on low throttle (eg cruising at 50km/h @ 3000rpm). If throttle position is maintained it will revive itself after 1-2 seconds.
  

Related info

• I've just had new splitfire coils & plugs put in last week as 5 out of the 6 oem ones were cracked.
  
• Mate has suggested possible cracked head gasket with a cylinder sucking in water. Radiator shows no signs of oil though.
  
• When I bought it 5 months ago all cylinders were compression tested and all were exactly 150psi
  
• Since purchase I have done a couple of supersprints and a couple of hillclimbs so any components that were about to fail due to be 15 years old have now been stressed
  

Any help is appreciated.

Thanks.

[Moodles2]

Because of the age, my suspicion is the fuel pump

[semislickR32]

Because of the age, my suspicion is the fuel pump

yeah it does feel like a fuel delivery problem, but if so would it be ok on boost? Must say the fuel pump is pretty loud when pre-priming - it sounds like my walboro in-tank one I had in the S15 so I thought it might be an aftermarket item installed by a previous owner. I guess it's impossible to tell without pulling it out...

Is it likely to be any other part of the fuel delivery system, eg filter, injectors?

Cheers

[The Dan]

List of other mods including ecu type would help

[semislickR32]

List of other mods including ecu type would help

Good point. The car is a stock 1994 R32 GTR with the factory ECU unmodifed, only engine mods are 3" exhaust and splitfires coilpacks. As mentioned above fuel pump *may* be aftermarket but really don't know.