newRX-7

I have been having trouble with my car since rebuild. Not really specific enough I know but here we go, The black "spacer?" between my dynamic chamber and my TB has oil in it. it is not suppose to is it?

I have herd that NZ Convertible knows his cars what do you have to say?

nillahcaz

iTrader: (2)

is there a problem with the car other than this? I have no clue how oil would get there, the only fluid near the upper intake is coolant. how much oil was it?

Craiger

iTrader: (1)

You need to post more info. Kind of car (ie. turbo/non-turbo and S4/S5), mod's, mileage since rebuild, and any other stuff you've done to it that could be useful.

The only thing I can think of off the top of my head that would leave oil in that area is if the motor was prepped for storage using fogging oil. I would expect a small amount of oil to pool in that area after it is sprayed in and left to sit.

No crankcase oil comes anywhere close to your tb though.

newRX-7

sorry about that guys it is an 89 NA and it has been 900 miles since rebuild. after car has reached opperating temp and i turn it off it wont start untill after about a half an hour after it has cooled a little. and even on start up it is hard to start.

Craiger

iTrader: (1)

hmmm... no hot start can suggest low compression, which is normal right after a rebuild, but after 900 miles I would have expected that problem to have been minimal if not completly gone. No idea how oil is ending up in your TB. You may want to contact whoever built your engine and talk to them about your problems. Could have been a bad build (I'm not saying it is, just that because of the symptoms you are discribing that possibility is there).

wvumtnbkr

do you still have your emmisions system hooked up? On an S4, the evaporative system will discharge into the intake and could cause a slimy, oily mess inside the or near the TB. I am not sure about an S5.

Aaron Cake

iTrader: (1)

It's normal to find a bit of oil in the intake manifold. It's from intake reversion and the purge system.

The starting issue will be there until you get some runtime on the engine. Used housings often end up with low compression on rebuilds. It could take several thousand miles before it starts every time. Depends a bit on the quality of the rebuild.

You did have your injectors professionally tested and cleaned while the engine was being rebuilt, right?

newRX-7

what about if my 5th and 6th ports arent oppening up on high revs? i know that that should produce about 2 pounds of pressure right? if that pressure isnt venting correctly then would that puch iol places? no injectors have not been cleaned. emissions are still hooked up.

a real puzzler for me.

wvumtnbkr

well, like I said, (And Aaron Cake more accurately stated) there will be oil in there from the purge system.

DO a compression check.

Get your injectors cleaned! It sounds like it is flooding a lil bit. I bet if you get all 4 of the injectors cleaned (professionally) it will start up fine every time!

newRX-7

good times I appreciate all the help and I will get on cleaning the injectors when i get off work, prob take it to The Spyder for help doing so. oh and the compression tested like this when i did it earlier
Checked compression cold, no throttle open. (Crappy tester)
90-90-90
85-90-92

Good enough numbers.

jackhild59

iTrader: (7)

I am not picking on you, it's just that if you are going to accuratly diagnose the problem, you must have good data. You do not have good data. You have no idea what the real compression is.

Here is why your information is bad:

Compression should be tested engine warm-you tested cold. Cold tends to test low but also the results can be erratic.

Compression should be tested throttle wide open, you tested throttle plates closed. Closed tends to test low.

Do a good compression test and you will have better information.

Here is my 'The Compression Testing Post to End all Compression Testing Posts'

https://www.rx7club.com/showpost.php...65&postcount=3

Good Luck!

Craiger

iTrader: (1)

D'oh!!!! I feel like a dumbass because I completly forgot about that!!! Sorry about the mis-information.

Craiger

iTrader: (1)

Like the other guy said, do the test properly hot and that will give you useable information.