Rb25 stalls after warmed up (long but needed to give whole story) - Skyline Owners Forum

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Old 07-12-2017, 06:03 AM   #1
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Rb25 stalls after warmed up (long but needed to give whole story)

Ok guys so heres whatsup, this is a long post fair warning.
i have a series 1 rb25det in my 95 s14. I got it a year ago tuned it on a z32 MAF and a z32 na ecu with nismotronics, found out it had a bad turbo, but it was reliable, no hiccups at all.
So i pull motor and trans, planned on building it but didnt, just inspected block without pulling everything out, it had compression. I lapped the valves, new head gasket, rear main seal, thermostat, oil pan, arp head studs, water pump, oil pump, timing belt, cxracing exhaust manifold, freddy intake, q45 throttle body, wiring specialties oem main harness, precision 5858bb, id1050x injectors, precision 38mm wastegate, radium fuel rail, SARD FPR, warlboro 255 wired on its own relay, new fuel return and supply from tank to engine bay, fuel filter, battery in trunk, oem z32 MAF since the original was a knock off replacement.

So with all that said i get it tuned it makes 470whp 350tq. Runs damn good, until its warm.
Once its warmed up it stalls out, on the data log everything looks good with the ecu, the only thing that happens is the MAF voltage drops and the rpms just drop even when throttle is still applied.
You can start it back up and its a 50/50 shot if its running super fat with afr at 9 at idle, or its normal. So i can take back off and lay into it and it does a normal healthy pull and then again it hiccups again. And it constantly will do it.

Ive tested the MAF already its good, TPS is good, VCT is working, ecu is getting VSS signal.

The only thing that drops out on the log is the MAF voltage and rpm like i said. Guys im so lost at this point
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Old 07-12-2017, 08:53 AM   #2
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Vacuum leak?
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Old 07-12-2017, 09:36 AM   #3
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O2 sensor?
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Old 07-12-2017, 02:44 PM   #4
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If you've had it out it may be worth checking all earths again

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Old 07-12-2017, 03:07 PM   #5
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O2 sensor is brand new.

ill boost leak test it but it doesnt do it all the time so unless something's coming undone then going back together i dont believe its a vacuum leak but i will still check.

And okay, ill double check all grounds again just to be sure.

Some people have said coolant temp sensor so im going to try and monitor that on the logs as well.
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