rb25det issues

[armygsrcivic]

ok well i finally got a new head and installed it this weekend on my rb25 that i have installed my s13 . i torqued everything down to the "T" according to the FSM. well now im having idle issues, whining sound coming from the front of the engine and i also have a ticking sound coming from the fire wall area. when i pulled off the head nothing was messed with, etc... mafs or map sensor. well when i finally got it to run (which took a while) i took it for a test drive. occasionally it will die when i come to a stop and the car also sounds like a subaru from idle up to 5k rpm, but still pulls like it should when i get on it. can anyone give me some pointers? this car has been nothing but headaches.

[240z4u]

Your timing belt is too tight. Thats what your whining is.

Guessing vac. leak for the other problems. Your crazy if your making full throttle pulls when the car isn't idling right. Just asking for problems.

Do some searching, your problems aren't uncommon and its likely that we can't figure out what got screwed up over the net anyway.

Evan

[armygsrcivic]

how d

Your timing belt is too tight. Thats what your whining is.

Guessing vac. leak for the other problems. Your crazy if your making full throttle pulls when the car isn't idling right. Just asking for problems.

Do some searching, your problems aren't uncommon and its likely that we can't figure out what got screwed up over the net anyway.

Evan

how do you go about over tightening the timing belt?

[lilskyline240]

its extremely easy to over tighten the belt. Just by turning the tensioner to far will do it

[240z4u]

^ yeah what he said. The tensioner gets set too tight. There is a process in the FSM for getting it "just" right.

Evan

[armygsrcivic]

ok i'll check on that. any ideas about the idleing issue? i mean i didnt mess with anything and all the sensors were working just fine before i removed the head. so im pretty damn sure that the mafs and map sensor are good...and i know the cam angle sensor is good cause it fires up. i sounds like it may be running off of 5 cylinders.

[240z4u]

Well, you did replace the timing belt, is your cam timing right?

Vac. leak comes to mind.

[mello88]

either one of your coilpacks is bad/unhooked or one of your injectors is unhooked. Check all your wiring.. If all the plugs are plugged in, then unhook each coilpack individually. If the idle gets worse, that coilpack was working fine, plug it back in and go to the next one. When you unplug one and the idle speed/sound doesn't change, that pack wasn't firing to begin with.

[lilskyline240]

it does also sound to me like your running on 5 cylinders if it sounds like a subaru. So like already stated check each coil pack and each injector

[Darius]

The engine should purr when it is idling and not sputter or sound like a subaru. Check your spark plugs after you idle it for a while and see if anything looks wrong (i.e. wet plug). Check the coil pack wiring harness for continuity back to the plug to the ignitor. Check the wiring from the ignitor to the ECU for continuity on each pin. If any of those connections are broken, that cylinder won't fire. If all of that checks out, pull the plugs and rest them on the valve cover with the coilpacks connected to check for spark. It is also important to disconnect the injector harness while doing this or you'll be spraying fuel all over the place.

Like 240z4u said, do not make anymore WOT pulls or even drive it if it is not running right. You might create other issues in the process.

Retension your timing belt like others have said. It is an automatic tensioner so you should only have to turn the crank for it to cinch up, then hold the pulley in place with an alley wrench and torque the bolt down to FSM specs. Simpy!

[Bwana]

Fix your timing belt tension NOW. I have a buddy who's head is virtually destroyed due to an over tensioned timing belt breaking the exhaust cam...

[armygsrcivic]

ok well today i tried everything known to man on this issue. we checked continuity from the ecu to the igniter.....and we get continuity from each wire. i also found out that its not running off of 5 cylinders but its ACTUALLY running off of 4 CYLINDERS!!! we first started off by pulling out all the spark plugs and found out that #2 and #3 plugs were black and dry (so we know that we are not getting any fuel) while the rest had normal markings on them. we swapped those darkened plugs into the other cylinders and then pulled them out after letting it run for a few minutes and saw that the plugs then were brown so we know the plugs are good. so next we tried to test the coil-packs to see if they were getting spark which indeed they were. after that we figured it could be the injectors, so we pulled off the fuel rail and left the connectors on them to see if they were all spraying....well they were! so now we figured well everything is working so we put everything back together and tried to fire it up again. when we did that......we were back at square 1.......the #2 and #3 cylinders were still dead. so now im lost as hell where to start from again! cause everything worked normally outside the engine but as soon as it went back together ...nothing changes.

Any other ideas guys? oh yeah we also pulled the connectors off of #2 and #3 coil-packs while the car was running , but nothing changed.

[240z4u]

well if there is no fuel in the cyl. and the injectors are spraying you may be filling up your intake manifold with gas. Be careful, and check that out to see if they are indeed firing when bolted down properly. The lower orings that seat to the head are not leaking are they?

[armygsrcivic]

no there isnt any fuel leaks coming from the rings of the injectors and dry inside the intake manifold except the normal oil

well if there is no fuel in the cyl. and the injectors are spraying you may be filling up your intake manifold with gas. Be careful, and check that out to see if they are indeed firing when bolted down properly. The lower orings that seat to the head are not leaking are they?

[armygsrcivic]

no there isnt any fuel leaks coming from the rings of the injectors and dry inside the intake manifold except the normal oil

the other thing also is that im not getting spark either when everything is plugged in...

[Darius]

Have you tried switching coilpacks #2 and #3 with two coilpacks on cylinders you think are good? If #2 and #3 are still lean, then at least you have eliminated the coilpacks from being bad. If the coilpacks check out, I'm betting on the ignitor being bad.

What are your plugs gapped at BTW? 0.8mm?

[Bwana]

Compression test might not be a bad idea either...

[armygsrcivic]

Have you tried switching coilpacks #2 and #3 with two coilpacks on cylinders you think are good? If #2 and #3 are still lean, then at least you have eliminated the coilpacks from being bad. If the coilpacks check out, I'm betting on the ignitor being bad.

What are your plugs gapped at BTW? 0.8mm?

ill try swapping the coil packs today with 2 of the good cylinders but im pretty sure that the coil-packs are ruled out already......and the injectors for #2 and #3 still arent firing either.oh yeah and the plugs are gaped at 0.8

[Darius]

...and left the connectors on them to see if they were all spraying....well they were!

I thought you said all the injectors were firing? So now #2 and #3 injectors AREN'T firing??

[armygsrcivic]

I thought you said all the injectors were firing? So now #2 and #3 injectors AREN'T firing??

when the injectors are installed for some reason they wont spray.....same deal with the coilpacks......when they are out of the motor they fire up fine but once they are installed i get nothing...just #2 and #3 cylinders are still dead

btw.... isnt my ecu supposed to have a "cel" on it? cuz mine doesnt

[armygsrcivic]

bump

[BoostFab]

connect a 12v light bulb to the injector plug and rotate the CAS for testing the power to the questionable injector