Rb30Det Wont Start

[mcholden1]

ive recently put a rb30det into my vl commodore and ive wired it all up. the engine cranks it sputters but just wont fire ive checked the compression which is around 150psi per cylinder and checked that each coil is giving a spark which it is and each injector is injecting. if some one could help me out that would be greatly appreciated

[r32-25t]

Check fuel pressure and make sure the plugs are new and make sure the fuel lines are on the right way around (seen that done before)

[Blackkers]

Got your AFM hooked up and grounded properly? hard to say without seeing the car really

[mcholden1]

i made sure the fuel lines where around the right way and the spark plugs are brand new. ive hooked up the afm but im not sure if its grounded or not when i wired the computer into my vl i wired in the two constant positives and the one ignition wire

[Ben C34]

As this is really a conversion it doesn't have much to do with the fact is an rb2530. .

Wiring can be a nightmare.

And extremely hard to find a mistake online.

What ecu and injectors?

[mcholden1]

i have a feeling its a vacuum leak im running some 850cc injectors high imp i do have other injectors that are smaller cc rating and running a r32 rb20det ecu i have two ecus as well\

[Ben C34]

Well I seriously hope your ecu is tuned for those injectors. ....

[mcholden1]

yea one of the ecus have been tuned for the injectors all i want is to run it in with the standard ecu other wise i have a aftermarket ecu that i can wire in and try that straight of the mark

[scotty nm35]

It will run a little rich with the stock ecu I am guessing.

[mcholden1]

yea a little so frustrating tho the engine doesn't sound like its sucking any air in but hoping i dont have to pull everything apart again

[portaz]

Not sucking air? How do u mean? If it's got compression it must be but put your hand over throttle body while crankng if your not sure

[mcholden1]

yea thats why im confused it has compression and ive put my hand over the throttle body and i cant feel it suck which leads me to think theres a vacuum leak

[Ben C34]

Hmm

Good luck.

[scotty nm35]

Pull the plugs, I am guessing they are well fouled.

Once you realise we are correct, you will need to re-fit the stock injectors and replace the plugs to get it started.

[mcholden1]

yea they were soaked in fuel and black ill change the injectors tomorrow and the spark plugs ill buy some more then ill tell you the results cheers

[mcholden1]

yaaaaaaay it started for the first time wooohhoooo so happy. had my mechanic mate come round he was mind boggled couldnt work out why it wasnt starting ether. so when he left i got some new sparkplugs and put in the smaller factory injectors in and boom it started cheers for your help guys

[Ben C34]

That's hardly surprising it wouldn't start with huge injectors on an untuned ecu........

[PSI086]

I was thinking the exact same thing. I've seen one with a set of 440's in it and a factory rb20 ecu and that only just ran

[Dose Pipe Sutututu]

isn't it just common sense?

bigger injectors on a factory ECU programmed to control factory sized injectors.. a simple analogy could be a garden hose water gun

Mist Setting (factory injectors) - press trigger half way, just the right amount of water for plants

Retard Jet Setting (larger injectors) - press trigger half way, water sprays everywhere hits neighbour and her shirt is now see through.

[Ben C34]

Neighbour is old and fat.

Fail.