Low idle

[garner]

Ok so yesterday morning I was getting some food in the drive thru and noticed my truck was quieter than normal(I took off the exhaust from the muffler back) and when I looked at my gauges I was idling at 500. Normally I idle around 750 when up to temp and 1300ish on start up. No codes or anything. Any ideas?

 

[quietpeen]

moved this to engine and performance.

 

[LB3711]

i idle around 500 all the time. Only time its higher is when i first start it. Fluctuates too at times.

 

[garner]

Interesting. Today it was around 750 like normal

But I did notice this


The oil gauge seems a little higher than normal. Temps in the evic were around 160 I wanna say and pressure was in the 50s

 

[LB3711]

in the evic at idle my oil pressure is about 25 and driving about 65ish its about 47-50

 

[countryboy92]

I have the same idle speed as yours does generally but then my oil pressure is slightly high on the gauge and the truck runs fine. Be interested if you find anything with yours.

 

[garner]

Ok so last night the oil gauge was at the 3/4 mark. Evic said oil pressure was 53 and oil temp was 194. When I got home and put it in park, gauge dropped to middle mark and pressure was 33 but oil temp was still 190. It was around 80 degrees outside. Should I be worried about the high oil temp?

 

[TRCM]

Might have a bad sending unit.

If oil temp is highs, pres should be low, as the engine is still tunring the same RPM.

Cold oil will give a higher press than hot oil @ the same engine RPM.

 

[LB3711]

my oil temp gets to around 200 deg. with normal driving. Temp wont change with pressure. Getting air moving around will. When mine is cold I have seen up to 65 psi. Once its warmed about 50ish with acceleration and at idle about 25ish. I have noticed idle especially with the AC off its at or below 500. I have almost 30k on mine now

 

[Trupiano]

Might have a bad sending unit.

If oil temp is highs, pres should be low, as the engine is still tunring the same RPM.

Cold oil will give a higher press than hot oil @ the same engine RPM.

You sure about that? I work on aircraft and the way it works for us is engine oil pressure, and prop gearbox oil pressure is low until it engine warms the oil up. Higher temp oil causes expansion, and raises the oil pressure.

 

[PostalTwo]

he is right oil pressure will be lower due to the fact that the oil gets thinner as it heats up

 

[jlb]

There are some interesting ideas being tossed around here lol.

I would agree that as conventional dino oil heats up, the viscosity in turn decreases, which would result in lower pressures as it would be easier to push the oil through the system. However we don't use conventional dino oil, not that the dino part really matters lol, that is just for fun .

The important part I think is that we use multi-weight oil... I can't remember what we use (only changed my oil once so far), but let's say it is 10W-30.

That means, if I remember correctly that at a standard "cold" measurement (like 30 degrees fahrenheit or 60, whatever, the **** is "cold") the oil will have the viscosity of a standard 10W oil as defined by the SAE. This aids in easy oiling on start-up because of the low viscosity when your engine would normally run dry until the system is primed with a higher viscosity oil. In turn, when measured at a high temp (operating temp) the oil has a weight of 30 as defined by the SAE to provide better oiling coverage during operation when initial viscosity is not as much of an issue.

Now I lost track of how I was going to end this, but I hope what I said above aids the discussion lol.