5.9 V8 - Low Oil Pressure? What's yours? - DodgeTalk : Dodge Car Forums, Dodge Truck Forums and Ram Forums
DodgeTalk : Dodge Car Forums, Dodge Truck Forums and Ram Forums
 HOME  FORUMS  GALLERY  GARAGE  TECH  CLASSIFIEDS  LINKS  MEMBER MAP  ARCHIVE  SPONSORS
INFO SITE HELP ARCADE TELL-A-FRIEND STAFF CONTACT US AUTO LOANS


DodgeTalk.com is the premier Dodge forum on the internet. Registered Users do not see the above ads.Please Register - It's Free!
Go Back   DodgeTalk : Dodge Car Forums, Dodge Truck Forums and Ram Forums > Dodge Truck, SUV and Van Forums > Dodge Ram Truck 2nd Gen (94 01) Forums > 2G Dodge RAM - General Talk

Closed Thread
 
Thread Tools

Two60s98
 
  5.9 V8 - Low Oil Pressure? What's yours? - Posted: 11-14-2005, 09:53 AM
Two60s98's Avatar
Registered User
Joined: Nov 2005
Posts: 104
City: Diego Garcia, BIOT
State: AK
Status: Offline
Post #1

.
The '98 Ram we recently purchased (5.9 V8; auto; 2500 4x4), seems to have low oil pressure, according to the gauge. With the engine off, the needle's pegged down below zero, which is normal. With the key in "On" position, it moves up to the zero, like it should. I fire it up, and at a cold start-up, pressure reads about 50 psi. Then, as the engine temp slowly rises to operating temp, the oil pressure slowly lowers to about 22psi. I'm glad it's not a quick drop, but still concerned that it drops at all. I'm not yet familiar with the Rams, but I thought that the pressure would increase with rpms. At least with every other vehicle that I've ever owned. But this truck, the pressure sits in one spot, and doesn't fluctuate at all. Stays steady. If I stop somewhere, and go to drive again, if the engine is still warm, the pressure reads 22psi. Only after sitting a few hours will is start out up around 50 again. And then the drop starts all over again.

I did my usual background check, as I do with all my vehicles, and checked the dealer service department visits, so that I know what work has been done in the past. Interesting enough, I found out that around '99, it was in for low oil pressure, and they finally replaced the heads to cure the oil flow problem. Our fear is that it may be acting up again, and that we may be screwed $ wise. No more warranty left. It only has 52K miles, which is why we bought it. On the DodgeForum site, I had one interesting reply:

"There is no possible way for the heads to be at fault. I consulted my repair manual for this problem and the oil pressure should read 6psi at idle and 30-80psi @3000rpm. Personally, my engine runs between 35-45psi all of the time, even at high rpms. Another possibility is the oil line plug located in the vertical passage at the rear of the block between the oil to filter and oil from filter passages. It is mechanically seated and if improper mounting depth is present a dowel drift can be used to reseat it to correct dimensions. Accordingly, this can cause low, high, or erratic oil pressure signals to the sending unit. Unfortunately, a certified mechanic is probably the best solution to have this checked. I could see this being bad and the tech's that changed the heads out missing it or believing the heads weren't allowing proper oil flow, instead of it being improper flow to the heads. I really hope you understand all of this, tended to ramble a bit. Any questions, hope I can be of further help."

Just wondering what others have for running oil pressure, so we know if we have to look at it closer. I swapped out the oil sender, and it still acts the same. It has 40+ psi at startup, and then drops down to about 20-25psi after the first mile or so of driving and just sits there for the rest of the drive. My next thought, is to install a mechanical gauge to eliminate the dash one.


.
View Public ProfileSend a private message to %1$sSend email to %1$sFind all posts by %1$sAdd %1$s to Your Buddy List Reply Reply With Quote
Sponsored Links
Advertisement
 

BVRmonger
 
 Posted: 11-14-2005, 11:16 AM
Registered User
Joined: Apr 2004
Posts: 291
State: GA
Status: Offline
Post #2

I don't see how the heads can limit oil pressure. Just maybe oil drainback (I still don't see how)but that is not what you talking about. I believe these engines oil the valvetrain through the pushrods. Don't they?
You need a mechanical or elect aftermarket gauge to test the oil pressure. I would only trust the OEM gauge to give me the most vague idea of what the pressure really is. In my opinion that is the first to do.
View Public ProfileSend a private message to %1$sSend email to %1$sFind all posts by %1$sAdd %1$s to Your Buddy List Reply Reply With Quote

Buzzbass
 
 Posted: 11-14-2005, 12:21 PM
Buzzbass's Avatar
02 R/T & 05 Ram
Joined: May 2003
Posts: 2,201
City: Island of Mis-Fit Toys
State: NJ
Status: Offline
Post #3

the sending units on those go bad all the time. I'd try that along with a good can of motor flush. Then refill with at least a 40w synthetic. If you still have problems, then I'd suspect a clogged pickup in the pan. They all do vary in pressure somewhat between idle and cruising, that's normal.
__________________
My other truck is an R/T

2005 Hemi Ram Sport RC 2wd Yellow. 340RWHP, 350RWTQ
Comp 268 cam, P.I.E. Milled & Ported Heads with 2.02/1.65 Manley backcut valves, Compression bumped to 10.5:1, 6.1 Springs & Pushrods, Pacesetter Longtubes, 2800-Edge Convertor, Sonnax Line Pressure Booster, Diablo Tuned by P.I.E., Dual 3" Exhaust w/ Magnaflow X-Pipe Muffler, Taylor Shorties, Spindle & Flip 3/5 drop, Energy Suspension Urethane bushings F & R, SRT 20s, Cal-Tracs, Belltech Street Perfomance Shocks......this shit all started as an exhaust replacement/upgrade & new tires project. WTF !?

2002 CC Silver
2bbl M-1 w/large turtle
55 MM F&B TB
Spintech Headers
Full Spintech 3" True Dual system w/gutted hi-flow cats & x-pipe
1.6 HS Roller Rockers
Powder Coated GSM Fabbed Aluminum Valve Covers
Comp Cam .544/.544, 235*/240*, 114 LSA
2.02/1.65 EQ Ported Magnum Iron Heads
Smith Bros. Hardened 7.00" pushrods
B&G Chrysler M-1 Flash
Cal-Tracs
PowerTrax Locker
MSD 6A w/11mm Taylors & NGK 4291s
Full Custom Interior....Featuring SRT4 seats, custom stitching/embroidery on all seating surfaces & a Pistol Grip Hurst 1/4 Stick II shifter
IAT & MAP relocation mods
Full Hotchkis TVS Suspension Upgrade. featuring; new coils, leafs & sways.
Nitto 450s 275/50/17
View Public ProfileSend a private message to %1$sSend email to %1$sFind all posts by %1$sAdd %1$s to Your Buddy List Reply Reply With Quote

Two60s98
 
 Posted: 11-14-2005, 12:28 PM
Two60s98's Avatar
Registered User
Joined: Nov 2005
Posts: 104
City: Diego Garcia, BIOT
State: AK
Status: Offline
Post #4

.
Changed the sender, ran flush through it, and refilled with Mobil 1 Syn. No change.

.
__________________
.
__________________________________
'06 Ram 2500 CTD SLT 4x4
Grey-Silver
Mopar Step Bars
OEM Splash Guards
Rear Wheel-Well Liners
Tekonsha Brake Controller
Spray-in Bed Liner
High Idle Enabled

'98 Ram 2500 4x4 Club-Cab (Traded In)
.
View Public ProfileSend a private message to %1$sSend email to %1$sFind all posts by %1$sAdd %1$s to Your Buddy List Reply Reply With Quote

Buzzbass
 
 Posted: 11-14-2005, 12:45 PM
Buzzbass's Avatar
02 R/T & 05 Ram
Joined: May 2003
Posts: 2,201
City: Island of Mis-Fit Toys
State: NJ
Status: Offline
Post #5

ok, the needle doesn't drop out of the "normal" range, does it ? If not, I wouldn't worry about it. If it does, I'd suspect an oil pump. Thicker oil will help too, what are you using ? My R/T stays pegged at the high side of the range, but I'm also using 15w50 Mobil one. My hunch is that you're just fine though, considering the actions you've taken already.
__________________
My other truck is an R/T

2005 Hemi Ram Sport RC 2wd Yellow. 340RWHP, 350RWTQ
Comp 268 cam, P.I.E. Milled & Ported Heads with 2.02/1.65 Manley backcut valves, Compression bumped to 10.5:1, 6.1 Springs & Pushrods, Pacesetter Longtubes, 2800-Edge Convertor, Sonnax Line Pressure Booster, Diablo Tuned by P.I.E., Dual 3" Exhaust w/ Magnaflow X-Pipe Muffler, Taylor Shorties, Spindle & Flip 3/5 drop, Energy Suspension Urethane bushings F & R, SRT 20s, Cal-Tracs, Belltech Street Perfomance Shocks......this shit all started as an exhaust replacement/upgrade & new tires project. WTF !?

2002 CC Silver
2bbl M-1 w/large turtle
55 MM F&B TB
Spintech Headers
Full Spintech 3" True Dual system w/gutted hi-flow cats & x-pipe
1.6 HS Roller Rockers
Powder Coated GSM Fabbed Aluminum Valve Covers
Comp Cam .544/.544, 235*/240*, 114 LSA
2.02/1.65 EQ Ported Magnum Iron Heads
Smith Bros. Hardened 7.00" pushrods
B&G Chrysler M-1 Flash
Cal-Tracs
PowerTrax Locker
MSD 6A w/11mm Taylors & NGK 4291s
Full Custom Interior....Featuring SRT4 seats, custom stitching/embroidery on all seating surfaces & a Pistol Grip Hurst 1/4 Stick II shifter
IAT & MAP relocation mods
Full Hotchkis TVS Suspension Upgrade. featuring; new coils, leafs & sways.
Nitto 450s 275/50/17
View Public ProfileSend a private message to %1$sSend email to %1$sFind all posts by %1$sAdd %1$s to Your Buddy List Reply Reply With Quote

Two60s98
 
 Posted: 11-14-2005, 05:20 PM
Two60s98's Avatar
Registered User
Joined: Nov 2005
Posts: 104
City: Diego Garcia, BIOT
State: AK
Status: Offline
Post #6

.
Went by the stealership, and had two different techs say that our pressure is fine. Must just be a Ram thing. I'm going to get a mechanical gauge anyway, to get a better idea of what's going on.

.
View Public ProfileSend a private message to %1$sSend email to %1$sFind all posts by %1$sAdd %1$s to Your Buddy List Reply Reply With Quote

hot2k1ram
 
 Posted: 11-14-2005, 05:25 PM
hot2k1ram's Avatar
hot2k1ram
Joined: May 2005
Posts: 756
City: Metairie (new orleans) LA
Status: Offline
View This User's Gallery
Post #7

mine hits the very end of the "normal" range on cold starts and drops to the half way point when the truck warms up and is at idle, then back to the end of the "normal" range when driving

all these trucks vary
__________________
2001 Ram 1500 ex-cab 318 auto w/ 3.55s
Forest green pearl
-EXTERIOR-Cervinis SS hood, sport front conversion,diamond back euro headlights, chrome sport grill w/ speed grill inserts, shaved tailgate handle, 3rd gen ram emblems
-INTERIOR-dark tint, pioneer 8500MP head unit, DEI EXTREME series speakers and subs, new carpet kit, gray dash cover,black w/ gray insert neosupreme seat covers
-ENGINE-(318)volant ram-air intake, 52mm tb, pacesetter shorty headers, DH ignition system, 180 stat, custom quickflow exhaust exitting infront the rear tire, superchips programmer, under-drive pulley kit.
*SUSPENSION* custom 3/6 drop, nitro-drop shocks, hellwig rear anti-sway bar, 22" centerline polished rims wrapped in Nitto NT555 EXTREME ZR 285/35/ZR22, SSBC Rear Disc Brakes
View Public ProfileSend a private message to %1$sSend email to %1$sFind all posts by %1$sAdd %1$s to Your Buddy List Reply Reply With Quote

Dodge_Ram98
 
 Posted: 11-14-2005, 05:43 PM
Dodge_Ram98's Avatar
Dodge_ram98
Joined: Nov 2005
Posts: 3
City: Northern Minnesota
Status: Offline
Post #8

The oil pressure on my 98 will register fine (above 40) will driving but after you warm her up it will drop to 0 at stops or idling. The truck has been doing this for a year know and over 15000 miles but has never knocked or pinged during the time it has supposidly had no oil pressure I even replaced the sending unit and nothing so I tried running thicker oil,Very thick oil 2quarts of lucas and 3 of 10 30valvoline and everything reads good but we will have to see if that combo is thin enough for cold stars this winter. I dont know just my findings no one else had a suggestion except new motor and the thing runs like a champ.-BROBERG-
View Public ProfileSend a private message to %1$sSend email to %1$sFind all posts by %1$sAdd %1$s to Your Buddy List Reply Reply With Quote

Dodge_Ram98
 
 Posted: 11-14-2005, 05:44 PM
Dodge_Ram98's Avatar
Dodge_ram98
Joined: Nov 2005
Posts: 3
City: Northern Minnesota
Status: Offline
Post #9

I replaced the pickup in the pan also no change.
View Public ProfileSend a private message to %1$sSend email to %1$sFind all posts by %1$sAdd %1$s to Your Buddy List Reply Reply With Quote

hot2k1ram
 
 Posted: 11-14-2005, 06:27 PM
hot2k1ram's Avatar
hot2k1ram
Joined: May 2005
Posts: 756
City: Metairie (new orleans) LA
Status: Offline
View This User's Gallery
Post #10

come to think of it, my gauge is wrong, i think the oil gauges on these trucks go out really easy, b/c my oil pressure used to never go above 40psi no matter what, then one day i had to get the truck jumped and for no reason at all it went up to the end of the normal line and has been ever since

maybe the gauges are just screwy
__________________
2001 Ram 1500 ex-cab 318 auto w/ 3.55s
Forest green pearl
-EXTERIOR-Cervinis SS hood, sport front conversion,diamond back euro headlights, chrome sport grill w/ speed grill inserts, shaved tailgate handle, 3rd gen ram emblems
-INTERIOR-dark tint, pioneer 8500MP head unit, DEI EXTREME series speakers and subs, new carpet kit, gray dash cover,black w/ gray insert neosupreme seat covers
-ENGINE-(318)volant ram-air intake, 52mm tb, pacesetter shorty headers, DH ignition system, 180 stat, custom quickflow exhaust exitting infront the rear tire, superchips programmer, under-drive pulley kit.
*SUSPENSION* custom 3/6 drop, nitro-drop shocks, hellwig rear anti-sway bar, 22" centerline polished rims wrapped in Nitto NT555 EXTREME ZR 285/35/ZR22, SSBC Rear Disc Brakes
View Public ProfileSend a private message to %1$sSend email to %1$sFind all posts by %1$sAdd %1$s to Your Buddy List Reply Reply With Quote

BVRmonger
 
 Posted: 11-14-2005, 09:43 PM
Registered User
Joined: Apr 2004
Posts: 291
State: GA
Status: Offline
Post #11

My oil pressure gauge never goes down to zero as long as the key is turned on. Even if it isn't running. Hows that for accuracy!
Before I went changing parts I'd pull the oil sensor sender unit and attach the tubing for a mechanical gauge or aftermarket elect gauge. Absent that you really don't know what the pressure is.
The OEM pressure gauge will alert to a problem you if it all of a sudden reads much lower than it normally does.
View Public ProfileSend a private message to %1$sSend email to %1$sFind all posts by %1$sAdd %1$s to Your Buddy List Reply Reply With Quote

mike54
 
 Posted: 11-15-2005, 09:41 AM
mike54's Avatar
Registered User
Joined: Aug 2005
Posts: 69
Status: Offline
View This User's Garage
Post #12

my '99 1500 5.9 ram the gauge drifts between 30 and 60 psi I don't worry about it because my brothers chevy suburban stays at 30 psi and my explorer I traded in for this truck stayed at 50 psi

so I figure if it ain't knocking it at broke.
__________________
Mike
2005 Ram 3500 4x4 5.9 turbo diesel
View Public ProfileSend a private message to %1$sSend email to %1$sFind all posts by %1$sAdd %1$s to Your Buddy List Reply Reply With Quote

purdueranger
 
 Posted: 11-15-2005, 10:01 AM
Registered User
Joined: Mar 2005
Posts: 217
City: West Lafayette/Noblesvill
Status: Offline
Post #13

mine reads high since I put the M1 on there and also a oil pressure sending unit from autozone. it will read 70 cold and 40 hot. when idling and it's hot it will drop down to 30. the coolest thing is, is that the gauge will like to dance around too. been doing this for over 10k and it runs like a champ except for the richness condition.
__________________
DodgeTalk.com 318 Enthusiast Member #(8)


1994 Grand Cherokee

5.2L V8
K&N FIPK
Fastman 50mm TB
Mopar Performance PCM
M1 intake manifold
Thorley Headers
3" magnaflow exhaust
transgo shift kit
KRC 210x Cam
Comp 1.6 Al Roller Rockers

2000 Z28 Camaro
enough mods to stop, turn, and go. Plus 400 RWHP
View Public ProfileSend a private message to %1$sSend email to %1$sFind all posts by %1$sAdd %1$s to Your Buddy List Reply Reply With Quote

Dodge318
 
 Posted: 11-15-2005, 11:15 PM
Registered User
Joined: Jun 2005
Posts: 502
City: Minneapolis
State: MN
Status: Offline
Post #14

Mine swings around like a friggen metronome. Cold it's at like 55psi, When in warms up it's like 30-40. Certain RPM ranges produce weird oil pressures For instance, It idles at 40 psi but upon accelarating it dips to 30 or so until it gets past 1600 RPM. At 60mph (About 1600 RPM) Its just below 40 but jumps right up to just over 40 if I go 62. (about 1700 RPMS). These Dodges had mega problems with gauge cluster and body control modules so I think it's probably electrical and I ingone it.
__________________
1995 Club Cab 1500 4x4 SLT laramie 5.2 Auto

297,000 miles and one theft under it's belt.


1997 Club Cab 1500 Sport 4x4 5.9L Auto

143,000 and doesn't run as good as the 1995
View Public ProfileSend a private message to %1$sSend email to %1$sFind all posts by %1$sAdd %1$s to Your Buddy List Reply Reply With Quote

bobem12
 
 Posted: 11-18-2005, 03:13 PM
bobem12's Avatar
4x4, Straight pipe roar!
Joined: Feb 2005
Posts: 2,549
City: Bargersville
State: IN
Status: Offline
View This User's Gallery View This User's Garage
Post #15

mines right at 40 after startup then gradually moves to about 65 and stays there.
__________________
'01.5 Dodge Ram 2500 CTD 4x4
QC Long Bed Auto 4.10 gears and GREEN!
Rebuilt trans, Edge EZ, 5" stacks, BHAF, no silencer ring, mechanical fp gauge, autometer pyro, boost, trans temp, Holley Blue lift pump, 2" leveling kit w/ 285 BFGs, Cobra CB, and a toolbox with a bunch of lights on it!

Gone but not forgotten>>>1998 Dodge Ram 1500 4X4 Laramie SLT Quad Cab 5.9l v8
View Public ProfileSend a private message to %1$sSend email to %1$sFind all posts by %1$sAdd %1$s to Your Buddy List Reply Reply With Quote
Closed Thread


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
OIL SENDING UNIT & OIL PRESSURE GAUGE HELP NEEDED redsoxwonit 2G Dodge Intrepid - General Talk 0 06-21-2005 07:48 PM
HELP!!! Code P0132 SHADOW QUAD CAB 2G Dodge Dakota General Talk 4 04-30-2005 09:00 PM
Code P0203-HELP rudegirl 1G Dodge Durango General Talk 3 03-31-2005 12:07 PM
Key Sequence for Codes on 04s scapegoat047 3G Dodge RAM - General Talk 10 03-05-2005 08:29 PM
low oil pressure rus 2.5L, 3.9L, 5.2L, 5.9L, V10 Tech 1 05-01-2004 08:33 PM



All times are GMT -5. The time now is 05:44 PM.





Privacy Statement