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Rb25det Kicks But Won't Run.

Pauly The R33

By Pauly The R33,
in Engines & Forced Induction

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Pauly The R33 Contributor

Pauly The R33

Posted
Posted

Hey guys having trouble with my R33 series 1 skyline. Since replacing all heater hoses and fuel hoses in the engine bay the bloody thing wont run .

Since it has been down i have changed the cat to a 100cell 5" body with 3" flanges , fitted a new optima battery and It had a safc which i removed, i did reset the ecu while battery was out.

I have tested the following:

Cas and injectors

Has a brand new walbro fuel pump hard wired with a relay

New Coil packs and spark plugs gapped at 1.1mm and tested spark.

It will run and idle but puffs a bit of black smoke with Afm and ecu coolant temp sensor disconnected, it will run for approx 3-5min before cutting off.

Replaced the Ecu coolant temp sensor and will kick and start with Afm connected but will die after 15 seconds or so.

Boost leak checked.

When slowly accelerating it seems to miss and splutter and if continued will shut off even with Afm connected and wont even make boost.

Has not been comp tested yet.

Anything else to look before i tow it to the mechanics.

Located in Port Macquarie.

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https://www.sau.com.au/forums/topic/461823-rb25det-kicks-but-wont-run/
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GTRPSI Mentor

GTRPSI

Posted
Posted

So you went back to stock by removing the SAFC.

Did you reconnect everything back to stock after removing it?

So whats left thats modded and not original in the car that is connected to fueling and reading air flow?

Sounds like its running pig rich....

Pauly The R33 Contributor

Pauly The R33

Posted
  • Author
Posted

Is it possible that you have mixed up the fuel hoses?

Thought this, not the case though it idles for 3/5mins in limp mode without afm and ecu temp sensor before i think the ecu shuts the car down.

Pauly The R33 Contributor

Pauly The R33

Posted
  • Author
Posted

So you went back to stock by removing the SAFC.

Did you reconnect everything back to stock after removing it?

So whats left thats modded and not original in the car that is connected to fueling and reading air flow?

Sounds like its running pig rich....

Yeah went back to stock and just followed the tutorial on install just in reverse, i have had the car running without it previously before changing the hoses etc.

The fuel pump is modded walbro 255, afm is factory have a z32 but didnt really want to splice in as i have a adaptronic with map that will be going in soon.

Im thinking timing and possibly ecu?

Pauly The R33 Contributor

Pauly The R33

Posted
  • Author
Posted (edited)

Why was there a SAFC - do you have upgraded parts? Correct coils (not S2 coils)? Can you swap out the AFM with a known good one? Plug ok? Changed engine bay fuel filter?

Safc was installed when i purchased the car . Coil packs are S1 have two sets bought a 2nd to test with. Other then a front mount thats the only upgraded parts other then those mentioned above. Stock turbo & injectors , Did have a bleed valve running 10 psi with the safc and have put a greddy boost controller on it and tested with both while the engine was running no issue previously making boost.

Changed the fuel filter when the hoses were done.

Edited by Pauly The R33
tridentt150v Grand Master

tridentt150v

Posted
Posted

Is the fuel pump running, can you hear it prime when you turn the key? Does it sound right/ Sounds like a fuel starvation thing, fuel filter, regulator, pump thing to me??

Check you have fuel getting to the motor.

Pauly The R33 Contributor

Pauly The R33

Posted
  • Author
Posted

Is the fuel pump running, can you hear it prime when you turn the key? Does it sound right/ Sounds like a fuel starvation thing, fuel filter, regulator, pump thing to me??

Check you have fuel getting to the motor.

Fuel pump primes . heaps of pressure actual reason i replaced the hose is because the were starting to leak due to the new pump .

Fuel filter is replaced , have not tested reg but shouldn't the car not run with ecu sensor and afm disconnected.

Afm for ecu air flow & ecu coolant sensor for fuel injection lead me to think it was ecu after getting a new sensor. Put the esel15 in and was doing the same thing and it runs a map instead of afm to rule the afm out.

Pauly The R33 Contributor

Pauly The R33

Posted
  • Author
Posted

If you hook it up the wrong way it will still get fuel but not enough. Not having a go but plenty of people have hooked the lines up the wrong way.

All good man i know what im looking at but thanks anyway. Also the fuel filter does have an arrow pointing out which way it flows aswell.

Pauly The R33 Contributor

Pauly The R33

Posted
  • Author
Posted

It's more about putting fuel in wrong end of the rail that gets people.

Ok sweet lets establish that the fuel system is correct and we have fuel to the cyclinders with spark. It will run without the Afm And ecu coolant sensor but not with them. Anyone had any experience with an issue such as this?

KiwiRS4T Grand Master

KiwiRS4T

Posted
Posted

If it runs without the coolant sensor then you need a new one. If you unplug the coolant sensor the ecu provides a start-up map to get you going.

But as above try plugging the safc back in and see what happens.

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