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Rb20Det Wont Start Help!

asus

By asus,
in Engines & Forced Induction

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asus Explorer

asus

Posted
Posted

I bought a 1993 r32 4 door with a factory rb25de but it was blown so I replaced it with rb20det which was a straight swap. I used the rb20det engine loom which plugged straight into the r32 all was good so far, then it came to starting it. it cranks over like a champ and compression is good its getting spark and it gets fuel but its to much then it floods the first 3 cylinders and wont fire.

But if u leave it to dry out and unplug the fuel pump and use start ya bastard it fires straight away then while its running plug the fuel pump back in fuels up abit but then comes good and runs fine until i turn it off and try to start it again with the pump plugged in so it floods it again.

Now I changed the injectors that didn't help, i changed the reg that didn't help and the ECU is showing codes for coolant sensor which has broken wire on it and the other is knock system but i plugged the knock sensors in and that cleared that code but it still wont start. I'm out of ideas and getting very pissed off. Any help would be awsome

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rob82 Mentor

rob82

Posted
Posted

I bought a 1993 r32 4 door with a factory rb25de but it was blown so I replaced it with rb20det which was a straight swap. I used the rb20det engine loom which plugged straight into the r32 all was good so far, then it came to starting it. it cranks over like a champ and compression is good its getting spark and it gets fuel but its to much then it floods the first 3 cylinders and wont fire.

But if u leave it to dry out and unplug the fuel pump and use start ya bastard it fires straight away then while its running plug the fuel pump back in fuels up abit but then comes good and runs fine until i turn it off and try to start it again with the pump plugged in so it floods it again.

Now I changed the injectors that didn't help, i changed the reg that didn't help and the ECU is showing codes for coolant sensor which has broken wire on it and the other is knock system but i plugged the knock sensors in and that cleared that code but it still wont start. I'm out of ideas and getting very pissed off. Any help would be awsome

So did you fix the coolant temp sensor?

asus Explorer

asus

Posted
  • Author
Posted

You sure because it is one of the main influences on fuel adjustment - including cranking injector on time.

Are you sure its only flooding the front three cylinder?

oh ok will do that 2morrow then. yea its the first 3 pulled all the plugs out and rear 3 were fine and front 3 were swimmin in fuel

asus Explorer

asus

Posted
  • Author
Posted

You say you changed injectors. Same rail or different rail with seated injectors? I'm going to say leaky injector seals whether it be rail to plenum or injectors to rail. They aren't really a reusable item.

yea i changed the first 3 injectors and used the same rail that was on the engine. its strange that 3 different injectors did the same thing and theres no sign of leaking from rail to injector. why cant they be reused?

blind_elk Grand Master

blind_elk

Posted
Posted

Have you considered that the ECU is delivering enough fuel to run a 2.5l engine, and you only have a 2l engine?

It may also be affected by a possibly different set of pinouts to drive the injectors, ie only injectors on 1/2/3 are the same between RB20DET/RB25DE, and 4/5/6 are totally different pins, so 4/5/6 never get injection.

SargeRX8 Grand Master

SargeRX8

Posted
Posted

Surely he couldn't be silly enough to run the r32 ecu...

most sealing components used to seal fuel components will pretty much shit it once they are exposed to air. those rubbers are old and brittle.

Blind_elk if that was case (no fuel in 4 5 6) surely the car wouldn't be ruining fine after he started it...

SargeRX8 Grand Master

SargeRX8

Posted
Posted (edited)

Get new O rings dude. Or try swap injectors 1 2 3 with 4 5 6 and see if that wets cylinder 4 5 6. Make sure you swap ALL seals over too, so which ever injector seats you have in 1 2 3 put them in 4 5 6.

Edited by SargeRX8
asus Explorer

asus

Posted
  • Author
Posted

Repace all the o rings mine where leaking in my 20 but the car would still run no problems. Did you clean the injectors before running the car

nah trying to keep cost down. on another note i took the rail off the plenum and left the injectors in the rail then I pressurised the system and no fuel leaked out of the injectors

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