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Old 07-28-2010, 07:23 PM   #1
04gsxrJustin
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oil light issue after warmup ('04 750)

bike is a 2004 gsxr 750 with about 14,500 miles. I just picked up the bike about 2 months ago and since buying it, the oil pressure light keeps coming on. The light only comes on when I'm at idle and only after the bike has warmed up. If I bump up the throttle above idle (which is roughly 1200 rpm) the light will turn off, but letting it go back down to idle will turn the light back on. I had the bike checked for fault codes and there are none along with no FI showing on the gauges. From a cold start, it takes about 3 seconds for the red light on the gauge to turn off which is the same light that comes back on. Since picking up the bike I have done 2 oil changes with factory oil and filters and have also changed out the oil pressure switch since it was decently cheap and easy to access (and yes I made sure not to over-tighten the filter). It was also suggested that I check the oil pump pickup screen which I checked tonight and there was no debris clogging up the screen or laying in the bottom of the oil pan. Lastly, I raised the fuel tank and checked the small section of wiring from the main harness down to the oil pressure switch for continuity and making sure it wasn't shorted to ground or broken.

Thanks for any help
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Old 07-28-2010, 07:47 PM   #2
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The pickup was my first though. I see that you checked it already.
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Old 07-28-2010, 08:57 PM   #3
04gsxrJustin
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yeah, i was going to wait until the weekend but got home early and was bored.. really just wanting to get this issue situated so i can confidently get the bike out to the track and have fun without worrying about this in the back of my head..
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Old 07-28-2010, 09:23 PM   #4
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No Clue
But for what its worth.
I have seen high mileage cars have low oil pressure indication at idle
a few revs higher the indicator light goes out.
Reason worn oil pump cannot keep pressure at idle.
it does not happen until warmed up because the cold oil is thicker allowing the pump to make sufficient pressure at the lower RPM.

Not sure if your bike suffers for the same
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Old 07-28-2010, 09:26 PM   #5
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It could be as simple as your oil pressure switch is bad or your oil pump might have some damage that is allowing it to not push as hard as it needs to. Yhe unit has a trachodial oil pump so unless it has been ran very low on oil the pump should be ok. Trachodial oil pumps are very reliable but do sometimes fail.
I would do an oil pressure test, and check the operation of the pressure switch to start.

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Old 07-28-2010, 09:27 PM   #6
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^^^
If so maybe just turn up the Idle and forget it.
I would not run heavier oil than the manual recommends.
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Old 07-28-2010, 09:29 PM   #7
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sounds like cajun 315 knows more than I
my bump up the idel was meant againts my earlier commet not his
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Old 07-28-2010, 09:33 PM   #8
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First you need to check oil pressure with a mechanical gauge. Confirm proper pressure as per manufacturer specification. Then go from there. Don't run the engine till you test pressure.
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Old 07-28-2010, 09:34 PM   #9
04gsxrJustin
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I put the factory 10w/40 in it with an oem filter both times.. As for the oil pressure switch, I already changed that out this past weekend.. After I put it back together soon with new o-rings, if it still does it I'll have Suzuki check the oil pressure after it's warmed up and then go from there.

I haven't seen any bearing like material come out in the oil so I wouldn't think one of those is going out and I'm also not getting any odd noises out of the engine so my next guess is the pump. Anyone think the oil relief valve could be sticking or is that highly unlikely?
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Old 07-28-2010, 09:35 PM   #10
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Or should I say till you're ready to test pressure
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Old 07-28-2010, 09:44 PM   #11
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The few times I have seen the Oil pressure relief valve go bad, the cause the oil filter to expand when the throttle is applied. The pressue will increase the higher the rpm's go, that's one of a trachodial pumps characteristics. As for the oil you should be using, go with a good 5w whatever synthetic. R4 is my personal favorite, lots of dyno testing led me to believe it's the best.
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Old 07-28-2010, 09:51 PM   #12
04gsxrJustin
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well, I greatly appreciate the help. I'll update the thread in the next day or so when I get everything back together and get a chance to test it out again.
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Old 08-17-2010, 07:48 PM   #13
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Quote:
Originally Posted by burnboy View Post
First you need to check oil pressure with a mechanical gauge. Confirm proper pressure as per manufacturer specification. Then go from there. Don't run the engine till you test pressure.
Thank you....My 1st step after checking the oil level would have been to check the oil pressure. There should be a spec in the service manual.

Oil starvation is Mui bad.
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