on removing the lower plenum, is it just the 3 bolts and the hexxed heads that you see or is there more hidden ? on the hexxed, i tried with an allen set and theyre quite hard to get off, an easier way to get em off ?

 

braker bars usually help.

 

Yes, there's much more.

It's actually 6 hex head and 2 nuts. The nuts are at the back in front of the EGR. There are two bolts that affix the EGR valve to the back of the lower plenum. Also, the stud for the upper idler pulley of the timing belt is threaded into the front of the lower plenum. You have to remove the timing belt and everything around it to get the lower plenum out. It's a major b*tch.

You want to replace the two lower intake manifold - to - head gaskets. They're quite pricey.

 

man... sounds like a bigger job than i expected. much unlike the upper plenum. is there no work around to getting to the det senor ?

my ecu is reading off the code for the det. so im guessing it'd retard the timing

EDIT: also another thing 91zxtt, the only reason why im replacing the det sensor is because im considering the fact that it retards the timing and also the ecu is reading it. should this be a major concern mentioning my symptons of my z - hesitation under normal conditions and rough idle. but im hoping that when my injectors come in, that should be the cure. but im also looking into buying the det sensor to see if thats another cause of my symptoms.

 

dont; half *** the job. just get it done. it's gonna have to be done sooner or later.

 

There's no round about to get to the det sensor.

You're right about it retarding the timing. Did you check your timing before you tore it apart? If you're above 15, then that could be causing it. Also, if you have a faulty injector, or two that are not injecting enough fuel into the combustion chamber, then it could ping; which could throw the code through the eco.

Notice how I said could. No guarantees.

If I were you and I didn't posess the know-how to get this job done, then I would put it all back together with the new injectors, check the timing and run it. If it still doesn't run right, then take it to a shop. The lower plenum removal sucks. It's by far the most difficult part I've replaced. I have a Craftsman 3/8" drive ratchet shaped hole in the wall in my garage to proove it. I haven't thrown anything that hard since Senior year high school baseball.

 

1/2 *** ? man, i wouldnt even know if i tried. ermmm... hence the fact im asking 91 how all these procedures go, and i dont want to end up taking all these various parts off to find out i dont know how to put it back

 

........ uhm. is it gonna be just as hard to pull out the lower plenum when i have the motor just sitting in the garage?

 

NO. It'll be much easier. The hardest part was the EGR valve. With the engine out of the car then the EGR should be a snap. I assume you're planning on doing the 60k service, so you'll already have the front of the engine apart.

 

lol, i can kinda sense ur anguish. as i know i went through tons of hell just trying to remove all the hoses >.<

 

yeah the 60K service, 02 sensors, Engine rebuild gasket kit. spark plugs, R34 turbos, DP, , ceramic coat the upper plenum black, polish the valve covers, hoen the upper and lower plenums, new EGR, replace all fuel lines, vacum lines, and waterbypass hoses. heater hoses. Flywheel and clutch. polish the throttle bodies. clean out the IACV, paint soem parts. and that should allow me to pass emisiions right?

 

ROFL!!
that sounds like overkill for just emissions
funny though.

 

WTF are R34 turbos?????

 

i'm guessing he means the turbos off of an r34 skyline.

 

thnx for hijacking my thread bard.

 

sorry dood. and yeah skyline R34 GT-R NuR turbos.

 

If that doesn't bring out NISMO, then I don't know what will. He was always talking about the NUR.

If I remeber correctly, the NUR turbos are no different than the other Skyline turbos. The NUR was significantly lighter and had gold plated something or another in the engine. I can't remember what though.

 

I think we'll starta a thread on the NuR skyline. casue we aitn wanna Hijack this guys thread. oh and yes. Golden Sparkplug thing.

 

The Nür Turbochargers were built by Mines... Definately better than stock.

Damn 91... You were right, haha.

 

HEY NISMO!!! where ya been? long time man.

 

Haha, I've been around. Thought I'd stop by and see how the guys have been.

 

not to Hijack the thread or anithign btu I'm clsoe to the front clip nismo. I got's 2700 on my pocket right now. should have full 3075 by next week. hti me up about that clip i need to see some pictures of my product.

 

Like I reminded someone earlier bardabe, there's a personal message system in place for that sorta thing.

 

He's just bragging, Riz. Haha

bardabe... You better hurry up, my contact in the Importation Business is getting out for Realestate VERY soon. Better get that last bit quick man.

Just to let the rest of you know... I wont be able to supply JDM Engines, or Clips anymore. Reason is stated in the sentence above