Hello all, I have a 1990 TT that recently had a motor swapped. A handful of stuff isn't working right. It is smoking grey, the oil pressure reads a little over zero, when the engine is turned off when it is warm you can hear what sound like water boiling in the turbos, it reads no boost, today both of the turbos sprayed oil up through all of the piping on the compressor side. My only guess is that something wasn't installed correctly when the engine was installed. Any ideas?
1990 300zxTT need help multiple problems
1 - 19 of 19 Posts
Joined
·
2,318 Posts
It sounds like you need to rebuild your motor.
-How many miles?
-What is you compression?
-When is the last time you did maintenance?
-What kind of maintenance did you do?
Grey smoke from the tail pipe sounds like coolant in the engine.
-How many miles?
-What is you compression?
-When is the last time you did maintenance?
-What kind of maintenance did you do?
Grey smoke from the tail pipe sounds like coolant in the engine.
The motor supposidly has 40k mi on it, compression is good on 5 cyclinders and a little out of spec on one of them, I have no idea what all maintaince had been done on the motor. I know that the radiator is good. I am also sure that the smoke is oil because if I take off the intake plumbing I can see oil in it. Another wierd thing about the oil in the intake is that it's black and doesn't seem to be getting hot, while the oil in the engine is fairly new and light brown. The problem is identical on both sides of the engine. I am kinda of leaning to their may be a bunch of oil sitting in the bottom of the intercoolers, but this wouldn't explain the low oil pressure. It would seem weird to me for both turbos to fail the same way and still have no problem building boost.
Joined
·
2,318 Posts
What are your compression numbers for all 6?
My guess is bad turbos or bad cylinder.
My guess is bad turbos or bad cylinder.
Joined
·
60 Posts
Joined
·
60 Posts
ew i jus read the beginning thread.Yeah,sell ur car. Low oil pressure = bad engine. Common problem with that model z too. In the wider fairlady the twinturbos are known for burning out,and jus from pickin up what u were puttin down you have one of these problems or both.Sorry bro
Joined
·
2,318 Posts
I've own a 1992 Z32TT for 17 yrs and I have had no unreliability issues that you are claiming (130K miles, stock motor and turbos). Your opinion is uneducated if your talking about most or all Z32's. Reliability comes down to the owner (motor maintenance) not the Z.
Joined
·
2,318 Posts
It's a common problem? Show me some facts instead of your hear say? Please add useful suggestions instead of irrelevant garble to the poster?
Joined
·
60 Posts
Of the last 2 gens of Z's before the 350,almost everyone that Ive seen has had its share of engine problems and burnt out turbos.I jus call em like I see em.Now mind you Ive never owned a Z,I certainly did consider it before I got into 240s 8years ago,and from all my research and everyone that ive ever known thats had a Z,its always the same story. Most of these problems stem from individuals doing performance upgrades,ofcourse you wouldnt know anything about that having babied your Z for the last 17 years.
Joined
·
2,318 Posts
LOL! My car has been on Sport Compact Mag and has done many trips to the drag strip in Fontana, 12.3 1/4 (stock motor and turbos @125K miles, please.)
HP output in this link
http://www.nissanforums.com/z32-chassis-300zx/40324-please-post-your-dynos.html
My 1/4 mile in this link
Z32racing.com - DRAG LISTS
Like you said you never owned a z32 and don't know what you are talking about. Obviously maintenance plays a big part on the reliability of any engines especially the VG30DeTT.
If you really think the VG30 is bad engine then you really need to look at the history of this engine. Five years IMSA champion and winning a 24hrs Le Mans series. If what I just showed you means nothing to you then you truly don't know what you're talking about.
if the engine cant breath it can cause it to smoke as well also check for blow by or possibly a bad turbo. if it was just that one cylinder that was low then it could smoke out of only one tail pipe compared. Also if one of the breasthers from the valve cover to the intake are hooked up incorrectly it can begin to smoke and blow oil into the intake and intercooler pipes
Thanks all, the oil pump being cooked turned out to be one of the main problems. I decided to go ahead and instead of fixing this engine, pulling it and replacing another engine that I have after I rebuild it. Anyone want to buy a engine that needs some work? Ryancft, I bet you're right about the oil coming from the valve covers. I found a few lines that seemed to be in the wrong place.
That can always do it specialy if the pcv valve is hooked up incorrectly.
Joined
·
2,318 Posts
If your Z has over 100K miles on it it's most likely your valve covers leaking and is a common problem with high mile Z's.
if a valve cover gasket is leaking it would not be putting oil into the intercooler piping it would be putingit on the cylinder heads and the exauhst manifold most times.Oil get's into the intercooler and piping due to incorrect vacum lines,blow buy,and turbos gone bad. valve covers wouldn't do that.
1 - 19 of 19 Posts
