R32 Rb20Det Doesnt Start Please Help

[r32skid]

Hi guys,

so i brought this r32 rb20det skyline which doesnt start,

- it turns over but doesnt start,

- it has fuel pressure and the fuel lines are on the right way. so fuel is fine.. however the spark plugs are dry.

- i pulled out one of the coilpacks and sat the sparkplug on the strut bar and there is spark at the plug.

- there is power to the injectors, but they are not pulsing when i crank it.

- i took the cam angle sensor into the auto sparky for testing, it works fine.

the next thing i was going to do is replace ecu but ive read a few other forums where they say they have the same problem and replacing the ecu doesnt make a difference.

any help would be much appreciated, thanks in advance

[Bl4cK32]

i would have thought the next thing to look @ would be the injectors themselves? Pull em out, are they squirting?

here is power to the injectors, but they are not pulsing when i crank it.

[r32skid]

i could do that, good idea but was told it was highly unlikely that all 6 would have crapped out. i will try thou. thanks 4 advice

[blind_elk]

How long since the engine actually started? It may be that the injectors are gummed up. While you have them out, get them sonic cleaned.

[r32skid]

it hasnt been started for ages id say at least 6 months, so they could be , but the mechanic said they arnt channging polarity from + to - so they dont open to let fuel through, wouldnt this mean its a electrical problem?

[DVS JEZ]

Get a noid light to check if there is actually a pulse.

Check all fuses etc.

[mr031]

is the crank angle sensor plugged in lol, check fuses as said. check earth points near the temp sender aswell

[r32skid]

got a test light, shows power at the injector but no pulse just constant on both wires. this is at all times even when not cranking. yes the cam angle sensor is plugged in lol, what fuses should i check? main fuse is fine and air con and anti skid have been removed. thats all i know from memory

[blind_elk]

is the crank angle sensor plugged in lol

Spark wouldn't work if the CAS wasn't plugged in & working.

Try connecting one side of the injector to earth, and apply 12V to the other side - you should get the injector to open. If it doesn't, then either the injector needle is gummed shut, or the injector is cactus.

[r32skid]

thats cool will try it, but that wont make it pylse will it? will it just be constantly open?

[Bl4cK32]

thats cool will try it, but that wont make it pylse will it? will it just be constantly open?

bingo. your testing that it opens, if it doesnt then its either gummed or stuffed, and yes i have heard that all 6 injectors can get clogged and stuck

[r32skid]

ok cool, but i have power to both wires already so

shud i just earth 1 of them?

[blind_elk]

You have power to both wires because the injector is simply a part of the circuit. To open the injector, the ECU switches one of the pins on the injector to earth. That provides the current flow necessary to cause the injector solenoid to activate the injector needle. You probably won't be able to tell which wire is the one being switched to earth by the ECU. If you earth the incorrect one, you risk popping the fuse.

[r32skid]

every injector has a white wire with a black stripe

injector 1s second wire is a solid white wire

injector 2s second wire is a white wire with green stripe

injector 3s second wire is a white wire with a red stripe

injector 4s second wire is a white wire with a black stripe

injector 5s second wire is a solid blue wire

injector 6s second wire is a white wire with blue stripe

so im guessing the earth in each injector is the common one between them beingthe white 1 with a black stripe..

anyway i pulled the earth out of one of them and temporarily replaced it with an independent earth and it pulsed and the car almost started,

so what does this mean and what could i do to fix it?

note, i also swapped the ecu today so that cant be the problem

[mr031]

you say you a test light, is it a led test light? A 12v globe in a test light will not pick up switching to a injector. if you have spark and no injector pulse, i would think its a ecu problem

[DVS JEZ]

Exactly ^^^

u need to get a noid light or LED test light to check for the pulse.

Take off the return line from the fuel rail and sit in a bottle. Then crank to see if fuel flow out.

Refit

Try crimping the return line to up the pressure and rule out the fuel pressure reg.

If it still doesnt start try some start ya bastard or carby cleaner etc, spray it into the intake and see if it kicks over at all.

Let me know

[r32skid]

tried spraying into intake and it just blew back when turning over, like a backfire. so it looks like it might be timing??

[mr031]

Did you ever hear it running before? You said it ran 6months ago, did anything ever happen to in between?

hard to say its timming, if you need to be sure you dont have fuel spark or injection pulse 1st. If your in brisbane pm me, im a mobile auto sparkie. Really think you need to get someone to look at your car mate.

[Dose Pipe Sutututu]

You sure the fuel lines are the right way? I fked up before and couldnt start the car.

[Dose Pipe Sutututu]

Fuel filter to rail, to reg to return line.