Madhatter1
Madeira Beach FL
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Joined: 04/14/2008
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I need to know from 05 Cummins owners where their oil pressure needle sits when truck is fully warmed up at idle. I never paid attention when it was new. I am selling and someone was concerned that it was low at idle. Normal readings vary from year to year, so I am looking for 05 only. Truck runs fine and pressure is way up on the highway where I normally check it. If its the same at idle as everyone else I will know there are no problems. Thanks.
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wayne_tw
South Dakota/Georgia
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Joined: 07/21/2007
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On my 05 the needle would go down at idle and up at higher RPM's. Oil pressure will be lower at idle, that is normal.
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Madhatter1
Madeira Beach FL
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I know that it goes down like any other engine. I am trying to figure out the normal mark. Mine has a short blue line above the 40 and a longer blue line to the right and the left. Cold idle it is just below 40 and hot idle it is just above the left blue line. Running pressure is about the same hot or cold. Someone else thinks it is too low hot, not me. I forgot to write down the readings when new so I do not know if it has changed at all. I sold my 98 to a friend who still has it. It is cranked up to 400HP, has 370K miles, and oil pressure readings are the same as when new.
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camping man
Central Fla.
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Joined: 09/01/2001
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Mines down to 20 at idle, and a hair over 40 when I'm at 1500rpms. I don't know if I trust the factory gauges, I'd like to see a mechanical gauge on it myself. These factory gauges are maybe one step better than an idiot light.
05 Dodge 2500 Quadcab CTD NV5600/3.73rears
97 27ft.Sprinter 5er
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ib516
Up here!
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I can't answer the OPs question as he wants only 2005 numbers, but I can tell you the Dodge factory gauges are very accurate. I constantly conpare them to what the Scangauge2 says, and they are spot on. Just an FYI.
2004 Cougar 301 BHS 6580# Dry, 9000# wet, 9600# GVWR)
2007 Dodge/5.9L Cummins 3500 SRW Megacab 4x4/3.73
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NavyDood
DFW
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ib516 wrote:I can't answer the OPs question as he wants only 2005 numbers, but I can tell you the Dodge factory gauges are very accurate. I constantly conpare them to what the Scangauge2 says, and they are spot on. Just an FYI.
The funny part about that is the oem gauge reads what the computer tells it to read. The computer guesstimates what it should be and shows that as the reading.
- 2004 2500 QC Short Bed, 4x4, 48re, Brite White, HOG 4" T-304 T-Back, Self made PSMBuick style intake, Isspro Pyro/Boost/Tranny Temp sittin on the dash
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mkirsch
Rochester, NY
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What "guesstimate?" There is at least one electronic oil pressure sensor in the engine that the computer reads and forwards on to the gauge.
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Turbo Diesel Dude
Green Mountain, NC
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My 2005 CTD reads just above the 50lbs when idling cold. Running, same area when hot. Idling, just to the right of the low line, hot. 70,000 miles and has never changed a bit. I wouldn't have one concern whatsoever about it.JMHO
charles weidman
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Madhatter1
Madeira Beach FL
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Thanks all. I now know that I am in good shape. I had other trucks that showed higher hot and need the input from other 05 owners. Mine has 162K on it. Now it needs to find a good home. Buyers will nitpick anything and this had me wondering if there was any abnormal wear. As usual the Cummins is still at 100%. Thanks again.
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NavyDood
DFW
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mkirsch wrote:What "guesstimate?" There is at least one electronic oil pressure sensor in the engine that the computer reads and forwards on to the gauge.
Straight from the 2004 Factory Service Manual. Pgs 8j-33 and 8j-34.
Engine Oil Pressure Message - The instrument
cluster circuitry restricts the oil pressure gauge
needle operation in order to provide readings that
are consistent with customer expectations. Each time
the cluster receives a message from the PCM or ECM
indicating the engine oil pressure is above about 41
kPa (6 psi) the cluster holds the gauge needle at a
point near the middle increment within the normal
range on the gauge scale.
Engine Oil Pressure Low Message - Each
time the cluster receives a message from the PCM or
ECM indicating the engine oil pressure is below
about 41 kPa (6 psi), the gauge needle is moved to
the graduation at the far left end of the gauge scale,
the check gauges indicator is illuminated, and a single
chime tone is generated. The gauge needle
remains at the left end of the gauge scale and the
check gauges indicator remains illuminated until the
cluster receives a message from the PCM or ECM
indicating that the engine oil pressure is above about
41 kPa (6 psi), or until the ignition switch is turned
to the Off position, whichever occurs first. The cluster
will only turn the check gauges indicator on in
response to an engine oil pressure low message if the
engine speed message is greater than zero.
So in other words, it is a 6 psi switch. If the pressure is above 6psi, that is all the ECM looks for. If it is below 6psi the ECM give you the low oil pressure light. For the sake of the customer, the gauge is there so the customer thinks all is good and gets a warm and fuzzy feeling because they see "movement" on the guage. This is quite common through out the auto industry anymore.
* This post was
edited 09/03/08 03:40pm by NavyDood *
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