oil pressure on startup (kpro related?)

sunman · Post by **sunman** » Thu Mar 27, 2008 10:59 am

Hey guys,
Lemme start by saying this issue did not arise until after my turbo was installed and the new turbo calibration was loaded.

The problem is that occasionally, on start-up of the car, the car seems like it's not getting enough oil and idles at ~300 rpm, very roughly with the oil pressure lamp on. After about 2-3 seconds, the light shuts off, idle goes up to 900 and everything is back to normal.

At first, I thought this was just because the car was not cranking long enough so oil was not circulating through the car. I changed cranking fuel trim to -5% in hopes that the car would crank longer before it turned over so that some oil would be circulated. This seems to have worked for completely cold start-ups, but after I drive the car and park it for a bit.. I go back to start it up and the same issue occurs.

I really haven't thought anything about it, but today after class I hoped into the car, started it up and once again, horrible idle with oil lamp on.. but this time i heard grinding noises :noes: until the oil circulated through.

The thing is, when I get the terrible idling with oil lamp, it's because the car barely even cranks before it turns over.. it cranks something like 1 time and turns over immediately, idling like crap.

What's wrong here? I believe it's something in my calibration since my oil level is fine, I've added about 6 quarts since I drained the oil during the install, and it's not leaking. Any solutions would be greatly appreciated before I destroy my motor.

My current calibration is attached.

Post by **Spunkster** » Thu Mar 27, 2008 11:37 am

Oil pressure has nothing to do with the engine management. If the car hasn't been tuned yet that would be the first thing you should do. Once it is starting and running properly, if you still have a oil problem, then you need to start looking at the mechanical aspect of what has to do with oil pressure.

cranny · Post by **cranny** » Fri Mar 28, 2008 4:47 am

daalog while you cold start , see what your AF is and whats going on.

talonxracer · Post by **talonxracer** » Sun Mar 30, 2008 5:03 pm

Make sure you do not have TOO MUCH oil in there.

The reason why the oil pressure light is lit is due to the RPM's being too low and the pump not being able to make pressure at that low of a rpm. The low oil pressure is a symptom not a cause.

Dont run the car when it does that, immediately turn it off and try again.

kommon_sense · Post by **kommon_sense** » Tue Apr 15, 2008 2:19 pm

Remember that on cold start, oil pressure is ridiculously high on most cars because the oil is cold. I see roughly 70psi on start when the car is cold. Once warm is settles out to about 20psi @ idle.

As stated, your tune shouldn't impact oil pressure at all. Oil pressure is all mechanical.

My suspicion is that the problem is in your oil line plumbing and your oil line feed to the turbo.

Simple test would be to disconnect your turbo oil feed and plug it.

Do you have a restrictor in the line? What size is the turbo line feed? (-3? -4? etc.)