Still Missing - HELP

[adam 32]

its usually the ignition module (from personal experience) if the car develops a misfire, not if its always there...

did you check all the valves when you had the head off? do a compression test again, please

[46n2]

Adam : I'll try and find an open Workshop tomorrow and get a compression test done anyway - this is really frustrating. All of the valves looked OK when the head was off. Do you need to do any more than a visual check on the valves?

CMS : I phoned Nissan and they don't want anything to do with my car It's imported...They actually referred me to a place in Wooloongabba :confused:

If I can find somewhere open this weekend that's open I might try and get the knock sensor checked out. That is provided the Ignition module test doesn't give positive results...

PS - Since I've run the ECU Diagnostic, my HICAS light doesn't come on after 5 minutes of idling (which it used to do frequently). Since then I've had 4 or 5 runs idling for 5-10 minutes with no HICAS light - wierd...

Michael

[adam 32]

mike; yeh you need to make sure theyre all sealing properly. you cant tell a bent valve just by looking at it as all you see if the seat and the bend is normally in the shaft.

[46n2]

How do I check if the valve shafts are bent???

I'm going to guess that the head needs to come off again, but now that I've got a good idea of how it's done (and where all of the f&*k!ng finnicy bits are), it shouldn't be too difficult (as long as I get an engine crane & a 10 mm ratchet spanner - a direct reference to those two screws at the back of the head supporting the brackets for the turbo's water line)

Michael

[adam 32]

my turbo aint water cooled. those two hoses are coolant hoses arent they?

the only way to tell if a valve is bent is by pulling them out or running a comp test. if a valve is bent then it wont get a good seal on the valve-seat and therefore compression will be low

[46n2]

HOORAY!

I Got sick of all the F**king about, so I took it to Gavin Woods. Now I know that the problem is with the only gasket I didn't replace when I changed the head gasket! - the intake manifold to head gasket! Causing a huge vaccum leak in cyl 6...

Parts have arrived from Nissan, so now I guess I'll see how goes *fingers crossed*

:shake: :shake: :shake:

46n2

PS - Also got my new pads put in while I was there! RB74 are awesome!

[adam 32]

good news mate

its been a struggle hasnt it

im still gettin air in the coolant so possibly the head gasket has gone again... doh

[46n2]

Thanks Adam,

It has been a giant pain in the :shake: for so long... I haven't got the gasket in yet, but I'm going to organise it soon. I'm going to take it into them to do, because it'll take them 4 hours, and me at least 8

Sorry to hear that you're having dramas... Try a copper gasket, they don't cost too much, but on the down side I think you'll need to get your head and block machined... Keep me posted...

46n2

[adam 32]

did you re-tension your head bolts down?

im thinkin i may have to do that, might fix the leak

[46n2]

I did after 20 - 30 minutes of running, but I haven't done the 100K re-tension yet. Maybe I should do that tonight... But the retension seemed to fix my leaking coolant problem when it first occurred after putting the head back on... Good Luck

[46n2]

Summary: Order to check things in (or at least the order I should have followed)...

1. Plugs

2. Coils (note - even if resistance is OK they can still spark internally and cause problems. I don't know how to check for this though)

3. Ignition module (borrow someone's healthy one - but be warned - it's fragile)

4. Injectors

5. Gaskets (Intake - both to the head from the manifold, and the collector box to the runners)

6. Head Gasket

And if all else fails, or you want to know straight away, take it to a professional with experience with your model Skyline

I'll post (hopefully) final results once the new intake gasket is in.

46n2

[ix9]

I have an issue of my car misfiring while on boost.

The plugs are new'ish and look fine. The car isn't running lean as all the plugs are blackish.. gapped to 0.78mm too.

Coil packs are all fine, had them disconnected from the plug and they're all making sparks..

I also have a "psssssst" noice coming from near the intake manifold while idling and was wondering if that's normal and if it could affect the misfiring on boost issue.

[adam 32]

vacuum leak

fix that first then re-assess the problem