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Rb20det-r Dropped To 3 Cyl. Ideas? Need Help.

31GUN

By 31GUN,
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31GUN Proficient

31GUN

Posted
Posted

My car is running an RB20DET-R redtop ECCS.

It is stock with all the -R bits (tubular manifold, TO4, specific ECU, etc)

Driving down the freeway and it dropped a couple of cylinders, no mechanical noises, and got a ride home on a tilt tray.

1st tried swapping the crank angle sensor, no change.

next swapped the igniter, no change.

next started unplugging coil packs.

The engine is running on cylinders 2,4,and 6.

1,3, and 5 are dead.

Any ideas anyone?

I've got plenty of coil packs, plugs, 3 igniters, 4 crank angle sensors, but it seemed a bit strange 1,3,5 out and 2,4,6, in.

Every 2nd cylinder out

Need help.

Hooks

lagperformance Contributor

lagperformance

Posted
Posted
My car is running an RB20DET-R redtop ECCS.

It is stock with all the -R bits (tubular manifold, TO4, specific ECU, etc)

Driving down the freeway and it dropped a couple of cylinders, no mechanical noises, and got a ride home on a tilt tray.

1st tried swapping the crank angle sensor, no change.

next swapped the igniter, no change.

next started unplugging coil packs.

The engine is running on cylinders 2,4,and 6.

1,3, and 5 are dead.

Any ideas anyone?

I've got plenty of coil packs, plugs, 3 igniters, 4 crank angle sensors, but it seemed a bit strange 1,3,5 out and 2,4,6, in.

Every 2nd cylinder out

Need help.

Hooks

hey man.

just so you know in general when coilpacks go the car still idles on 6cylinders its when under load it will normally start detonating and misfiring dropping cylinders etc

on one of my past engines was only running on 5 cylinders changed coilpacks ignitor crank angle sensor etc.. none of them were a problem so decided to do a compression test tells all tales took the spark plug out of cylinder 6 to find the end broken off run a compression test no compression on 6cylinder sounded like a hotted up subaru and a gtr with the old foot down all cylinders make some compression under full load anyways couple weeks later after some text book thrashing pulled it out and to pieces that bit of spark plug took a nice chunk out of an exhaust valve

anyways advice for you

- check coil and injector loom replace if necessary

- remove spark plugs check for missing bits

- run a compression test these engines originally came out with 180psi per cylinder. yours will more than likely have less if all cylinders are even or within 10 percent of the highest reading cylinder algud otherwise some problems with valve seals, piston rings or head gasket depending!!!

- also check near the fuse box and all earths on the vehicle

- find another standard ecu

- get it on the diognostic tester local mechanical shop

- use the red and green lights on the ecu to manually check for fault codes if possible on this model

- look for hole in engine lol

anyways if all this doesnt work or you would like some furthur information feel free to ask

31GUN Proficient

31GUN

Posted
  • Author
Posted

I did the screwdriver to ear thing on the injectors and they are all firing

(I pretty much guessed that anyway because of the unburnt fuel coming out the rear)

I tested all the leads with a multimeter and all are good including earths.

So I tried a coilpack and plug on each cylinder. No spark 1, 3, and 5.

It's got to be between the igniter and this guy

newblack050.jpg

Actually, I'm starting to think that it may be an earth problem, but whoever did the GTS-R engine swap needs their arse kicked.

When I took the kick panel off, the ECU just fell out. It wasn't bolted in, just floating around behind there. :D

Hooks

MoogLe Community Regular

MoogLe

Posted
Posted

have you had any luck with this?

im having this EXACT same problem with my RB25 but im running a powerfc

cylinders 1,3 and 5 are dead.....

we're fearing it might be the ecu since the ignitors are built into my coil packs

it's definately getting fuel since i pretty much had a huge puddle of fuel on the ground after testing

  • 3 weeks later...
31GUN Proficient

31GUN

Posted
  • Author
Posted

Made another discovery.

newblack012.jpg

That looks to me like a removeable Eprom.

So It's definitely been fiddled with at some stage.

At the moment I am leaning towards the ecu being cactus.

It would be strange to have 1,3, and 5 out from the wiring.

I have another red cam cover ECCS ecu coming next week so I'll plug that in and start her up.

3 cylinders:- it's the wiring.

6 cylinders:- it's the ecu.

I'll post the results.

Lucky this car is my hobby car and not the everyday.

Hooks

31GUN Proficient

31GUN

Posted
  • Author
Posted

Actually think I may have found the problem

Looks to me like the board has seen a bit of heat, bit hard to see here....

DSC01001.jpg

Here it is a little closer

DSC01002.jpg

And this is the culprit on the other side

DSC01003.jpg

And with the retainer plate removed

DSC01004.jpg

I don't know if it can be fixed, but I'll be making enquiries before it ends up here

DSC01007.jpg

Hooks

  • 9 months later...

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