ZR-1 Net Registry Forums  

Go Back   ZR-1 Net Registry Forums > C4 ZR-1 > C4 ZR-1 Technical Postings

Reply
 
Thread Tools Display Modes
Old 12-08-2006   #1
8upZR1
 
8upZR1's Avatar
 
Join Date: Jun 2006
Location: Thunderbolt, Ga.
Posts: 253
Default High Oil Pressure

Hello all, I hope you are enoying life. I have recently put my ZR1 back on the road after having replaced the head gaskets and lifters and just about everything else. I have noticed that my oil pressure gauge is reading high. It is off the scale in fact when the motor is cold and at idle. When the motor is revved up the needle goes way off scale. When the engine is hot and at idle the oil pressure will go down to the very top of the mark, I think its 80 or 90 PSI. I am not sure if the gauge is reading correctly but I do know that before my head gasket problem it read normally. I replaced the oil filter thinking that it may be clogged but it looked good inside and the new one made no difference. Anybody have any ideas? Earlier this year the motor would not start because the lifters were pumping up and keeping the valves open. Perhaps the high oil pressure caused the old lifters to fail? I dunno, but any help would be appreciated.
__________________
IT IS THE FATE OF THE INNOCENT TO MEET WITH DEATH!!!
8upZR1 is offline   Reply With Quote
Old 12-08-2006   #2
guinnessdood
 
guinnessdood's Avatar
 
Join Date: Oct 2004
Location: Woods Cross, UT
Posts: 389
Default Re: High Oil Pressure

Look at the oil pressure sending unit and see if the oil has leaked into the connector side of the sending unit. Oil sending units can be purchased at nearly any auto parts store...ours isn't special. If the oil leaks into the connector you get all kinds of weird readings on the gauge.
__________________
Uly
Past OWNER 90 ZR-1 #0120 Red/Saddle
UT Plate: EZR1DER
guinnessdood is offline   Reply With Quote
Old 12-08-2006   #3
tccrab
 
tccrab's Avatar
 
Join Date: Oct 2004
Location: Folsom CA
Posts: 1,656
Default Re: High Oil Pressure

Quote:
Originally Posted by 8upZR1
Hello all, I hope you are enoying life. I have recently put my ZR1 back on the road after having replaced the head gaskets and lifters and just about everything else. I have noticed that my oil pressure gauge is reading high. It is off the scale in fact when the motor is cold and at idle. When the motor is revved up the needle goes way off scale. When the engine is hot and at idle the oil pressure will go down to the very top of the mark, I think its 80 or 90 PSI. I am not sure if the gauge is reading correctly but I do know that before my head gasket problem it read normally. I replaced the oil filter thinking that it may be clogged but it looked good inside and the new one made no difference. Anybody have any ideas? Earlier this year the motor would not start because the lifters were pumping up and keeping the valves open. Perhaps the high oil pressure caused the old lifters to fail? I dunno, but any help would be appreciated.
The oil pressure sending unit is a common failure in the early ZR1's.
http://www.zr1netregistry.com/ZR1_issues.htm#4

Pop in a new sending unit before you start ripping the heads off again!

TomC
'90ZR1 #792
__________________
TomC
'90ZR1 #792
Honorary Pirate


[B]If it ain't FUN, you're doing something terribly WRONG.
[/B]
tccrab is offline   Reply With Quote
Old 12-10-2006   #4
8upZR1
 
8upZR1's Avatar
 
Join Date: Jun 2006
Location: Thunderbolt, Ga.
Posts: 253
Default Re: High Oil Pressure

Thanks for the advice, I will try the sender tonight. I sure hope it is something that easy. Lately not much has. I could have definetely gotten oil on the connector as a tried starting the motor sans filter a few times and did the same with the valvecover. Quite messy.

On another note, this probably doesn't belong here, but my tach is dead and I'm lazy so my solution has been this great new shift light from Auto Meter. It has like 8 super bright LED's, a digital readout of engine RPM, progressive shift light, 10 variable light colors, launch rpm light, an excellent mounting system, 80 seconds of memory, max rpm. It has solved so many of my problems, I almost feel happy.

Bye all.
__________________
IT IS THE FATE OF THE INNOCENT TO MEET WITH DEATH!!!
8upZR1 is offline   Reply With Quote
Old 12-15-2006   #5
Hib Halverson
 
Join Date: Jun 2005
Location: CenCoast California
Posts: 899
Default Re: High Oil Pressure

Not only do the engines have occasional trouble with oil pressure senders but the analog gauge are horribly inaccurate.

First thing I'd do if you suspect excessive or (gawd forbid) not enough oil pressure. Is install a known-good gauge and read the pressure from that.
__________________
Hib Halverson
Technical Writer
former owner 95 VIN 0140
current owner 19 VIN 1878
Hib Halverson is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 03:08 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright ZR-1 Net Registry 2020