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In need of some expertise...

 
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Old 08-26-2016, 10:47 PM
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Icon5 In need of some expertise...

Hey guys, I'm new to the forum as a member yet have been using this forum for a while now to find answers I so desperately seek. However I have not been able to find out the answer to the issues I'm having.

I have a 97 Prelude Base with 200k+ miles on it, however youd never think that if you sat in the car as the engine is silent at idle with no shaking whatsoever. Here's the issue. When I first start up the car and have it in neutral the Oil pressure low light with flicker on and off (Its not flashing on and off like it normally should) It simply is flickering, and when I move the vehicle it will go out up until I have to stop at a red light again in which case it will start to flicker again and sometimes it flickers faster and faster until it starts flashing like it should do if there is an issue with oil pressure. Now I have an Oil pressure gauge hooked up and it usually runs at about 20PSI at idle when the engine is cool, and around 5PSI when hot(Which Ive read might be a little low? Maybe due to the oil I put in it 5w30. I was told 10w40 would be a better idea due to milage and the previous owner I bought the lude from told me that's all he ever put into it. The car ran great when I first grabbed it from him) It just seems ever since I took the car in for an oil change this has been an issue. The mechanic also informed that the oil pan release nut has been stripped at some point and someone had put a plug in its place to fix, which works great apparently because there are no oil leaks anywhere. Does anyone have a clue why my oil pressure Low indicator is doing this crazy flickering when the vehicle isn't moving and then goes off when it is moving? Could it be a bad sensor? Also should I change my oil back to 10W40 Castrol GTX like when I originally purchased the car? Exactly what is the benefit of going from 5W30 back to 10W40 that was in it when I bought the car? It seemed my oil pressure was much higher before than it is now...any suggestions or answers would be most appreciated!
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Old 08-26-2016, 11:59 PM
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Re: In need of some expertise...

Pressure: hopefully 5 psi is a typo -- spec minimums warm are 10 psi at idle, and 50 psi at 3000 rpm. Pressure dropping at higher rpms means something's not right! If your pressures are good on the gauge, then suspect the oil pressure sensor -- they don't go bad often, but it happens.

5W30 is OK if you're not living in 90+ degree weather. Otherwise, try swapping to 10W30. (Those are the factory choices.)
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Old 08-27-2016, 02:59 AM
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Re: In need of some expertise...

nope not a typo, its at 5psi when engine is warm after driving it around, and sometimes it even gets to almost 2psi, and I notive sometimes the gauge needle will bounce like as if the pressures are changing. I'm not sure where this gauge is tapped into in the oil system...but maybe theres a pressure leak somewhere? I don't know the gauge was installed when I got the car and seemed to be fine at 10psi-15psi warm with the 10w40 in it....could the oil pump be going? Also I live in Maine and the past month its been 90 degrees almost constantly, and my poor car hates the hot weather...Id like to also add that currently my downstream o2 sensor is not plugged into my car as I had the cat converter replaced and apparently the old 02 sensor disintegrated....so I ordered a new one today. Could a simple 02 sensor cause sluggishness when accelerating? As far as oil pressures at high rpms, I'm not losing any pressure at higher RPMs in fact at around 5k RPM I'm almost at 80psi(Which I believe is the point at which the pressure release valve opens so it doesn't go over 80 am I right?) cuz when I hit 80psi the needle instantly drops back down as if pressure was released somewhere quickly, and then it goes back up.

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Old 08-27-2016, 09:54 PM
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Re: In need of some expertise...

So today, just to update you on what Ive done to maybe narrow down what the cause could be, I got my oil changed. I purchased Castrol gtx 10W40 oil and an Oil filter at Advanced Auto parts that was on sale from 15$ to 5$. Anyway after the oil change was done, I noticed that the oil pressure light no longer comes on or flickers whatsoever(Even when I come to a stop at a light or sign) and my oil Pressure Gauge is now reading a steady 15-20psi at idle and reads 50psi at 2.5k RPM's.....The car is also running MUCH better now, aside from the fact that I still need to put a downstream o2 sensor in so the ECM isn't set to a fixed fuel ratio ( which I think is causing the hesitations of acceleration in 4th and 5th gear. I would just like to know your thoughts on this as changing the oil back to the 10w40 that was in it when I bought the car seems to be what the car wants...not the 5W30....Could it simply be because of the 220k+ miles on my car?...
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Old 08-28-2016, 10:19 AM
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Re: In need of some expertise...

I just had the same issue on the prelude I just bought. The oil light was flickering when the car was at full operating temperature at a idle. Changed the oil and it has not came back sense.
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Old 08-28-2016, 02:47 PM
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Re: In need of some expertise...

sounds like you should take it to Honda
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Old 08-28-2016, 05:57 PM
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Re: In need of some expertise...

If you were really driving around with effectively no oil pressure for any length of time, you wouldn't still be driving around, so something wasn't right about those sensor readings. Can't even begin to guess what, though.

If the car likes 10W40, use it.
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Old 12-09-2016, 02:06 AM
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Re: In need of some expertise...

I suspect the flickering is being caused by worn out motor and possibly a failing oil pump. The pressure is corrected with the thicker oil because it doesn't pass through the passages and around the bearings as easy (thicker). As the motor wears all of the tolerances in the motor start to open up and you start losing oil pressure.

A low oil condition can also cause this to happen, if the car is burning oil and it runs low it will cause the light to flicker when coming to a stop... This happened to me on a 97 Prelude SH and once the oil level was corrected it went away.

Last edited by H22TURBO; 12-09-2016 at 02:08 AM.
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