Oil Pressure sending unit
06-13-2011, 11:24 AM
#1
Senior Member
Thread Starter
Join Date: Mar 2011
Location: Louisville, KY
Posts: 503
Likes: 0
Received 0 Likes
on
0 Posts
Year: 2000
Model: Cherokee
Engine: 4.0
Oil Pressure sending unit
When an oil pressure sending unit goes bad is it possible to get erratic pressures? My oil pressure drops to zero when hot and at idle. I can rev the engine and the pressure comes up some. It's been like this for the last 2000 miles and the engine is still smooth with no knocks.
06-13-2011, 11:37 AM
#2
CF Veteran
Join Date: Nov 2009
Location: Manahawkin New Jersey
Posts: 1,291
Likes: 0
Received 1 Like
on
1 Post
Year: 96'
Model: Cherokee
Engine: 4.0 160k banks header dumping after the cat
theres a good chance it the sending unit... swap it out for a new one (usually between 25 and 40 bucks) and if your oil pressure is still acting weird like that get back to us.
06-13-2011, 11:50 AM
#3
CF Veteran
Join Date: Mar 2009
Location: Visalia, Kalifornia, ussa
Posts: 2,750
Likes: 0
Received 2 Likes
on
2 Posts
Year: 1996
Model: Cherokee
Engine: 4.0
Sending unit is like $15 and is probably the problem. BUT it would be a good idea to test the oil pressure when you change the sender.....
06-13-2011, 04:58 PM
#4
CF Veteran
Join Date: Nov 2010
Location: In the middle of Minnesota!
Posts: 5,804
Received 99 Likes
on
88 Posts
Year: 1999
Model: Cherokee
Engine: 4.0
You can either check it with a "mechanical" oil pressure gauge (some parts stores rent them) or you can just take a chance and replace the sending unit.
I buy the oil pressure sending units from Jeep. Way too many issues with some (not all) aftermarket oil pressure sending units. Well worth the extra money.
I buy the oil pressure sending units from Jeep. Way too many issues with some (not all) aftermarket oil pressure sending units. Well worth the extra money.
Trending Topics
07-05-2011, 09:50 AM
#8
Seasoned Member
Join Date: Jun 2011
Location: Garden Prairie
Posts: 281
Likes: 0
Received 1 Like
on
1 Post
Year: 2000, (1957 Willys)
Model: Cherokee
Engine: 4.0L
I hope your issue is the sending unit.
My 2000 cherokee did the same thing. low to NO oil pressure at idle when warm. The lack of oil pressure was a result of worn out crank and rod bearings. My head (a 0331 head) cracked, like soooo many 2000's did, and small amounts of coolant kept getting into the oil. Coolant=sand. Sand=bad bearings. $1000 later and I'm back in the good.
($1000 was for new head from Clearwater cylinder, oil pump, water pump, thermostat, various gaskets, and the new bearings. Oh, and I bought myself a new torque wrench
)
My 2000 cherokee did the same thing. low to NO oil pressure at idle when warm. The lack of oil pressure was a result of worn out crank and rod bearings. My head (a 0331 head) cracked, like soooo many 2000's did, and small amounts of coolant kept getting into the oil. Coolant=sand. Sand=bad bearings. $1000 later and I'm back in the good.
($1000 was for new head from Clearwater cylinder, oil pump, water pump, thermostat, various gaskets, and the new bearings. Oh, and I bought myself a new torque wrench
)
07-19-2011, 04:21 PM
#9
Newbie
Join Date: Jun 2011
Posts: 3
Likes: 0
Received 0 Likes
on
0 Posts
Model: Cherokee
Well naturally I just busted my OP sending unit removing the filter...Wish I would have read the earlier post before I did the work...Any ideas how to replace the thing, since it is broke off flush.
Thread
Thread Starter
Forum
Replies
Last Post
Blackxj51
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
22
09-13-2015 06:06 PM
15XJ
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
7
09-10-2015 11:17 PM
Ricardo Siqueiros
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
2
09-03-2015 09:17 PM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)