I have just installed an LS6 intake on my 98 Z28. I started the car and everything seemed great until I noticed the oil pressure gauge was reading 0. I am hoping that the only thing wrong is that I did not reconnect a wire connector. I have looked over the engine and I do not see anything that is disconnected except for the egr system, but I could be missing something. If anyone has any ideas I would like to hear them.

Thanks,
Darren Rager

 

Sounds like you might have broken your oil pressure sending unit, very common during intake installs. I would suggest getting it fixed soon. It turns out mine wasnt leaking any oil, so I put it off, untill one day, it decided to break off completley, and pour about 3 quarts down my bell housing, oiling down my clutch, had to get a new one. Luckily no engine damage (that ive noticed yet)

BTW, incase you didnt know, the presser sending unit is on the back of the engine block, but the driver side cylinder head, pretty hard to see and get too, you more than likley need to take the intake off (i didnt, since I had the whole transmission out)

<small>[ February 19, 2003, 07:43 PM: Message edited by: BoscoZ28 ]</small>

 

Yep, you broke the sender. When you put the intake on, the brake booster hose snapped the sender. It can be replaced with the intake on. I've replaced mine three times now (and I'm not a skinny guy).

 

Man, so what is the trick for not doing this when installing a manifold? I don't have an LS6 intake, but the info will be nice when I do have the manifold.
<img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />

 

To avoid breaking the oil pressure sending unit:

When removing the intake first remove the vacuum line from the intake manifold to the brake booster (leaving it attached to the intake manifold only). Then remove the intake manifold and be sure the vacuum line does not get hungup on anything.

I did it this way and did not break my oil pressure sending unit.

- Tom

<small>[ February 19, 2003, 08:36 PM: Message edited by: Tom99SS ]</small>

 

Thanks for the quick response. A broke oil sending unit makes perfect sense to me. I did not know their was an oil sending unit by the brake booster line when I removed the intake. It must be relativily delicate as I thought I was very careful when I removed the old intake.

My next question is does anyone have any basic instructions on how to replace the oil sending unit?

Thanks again.
Darren

 

How did you do it? From underneath? I broke mine and really don't want to pull the intake again.


Thanks in advance,

 

IMO.. the only way to replace it is with the intake off...

 

another though.. have you checked to make sure it's plugged in?

 

I start with the sensor in the socket with a 3" extension and no ratchet. Can only fit one arm ontop of the intake, right about where the fuel rail is, and start it threading with my hand. Once its started, I pull my hand out and stick the ratchet onto the extension and finish her off. To find the hole, I just run my fingers down from the map sensor then just keep feeling along until you find it. Once you have done it once, you can get it every time. If the sensor is not plugged in, then the pressure will read all the way HIGH, if its broke (but still plugged in) it will read ZERO.

 

Just bought the sensor from GM was only 33.00 for the 98. Has 2 prong wheras the 99+ were around 44.00. I will attempt to install without removing the intake tonight after work. Thanks for all the advice!