Oil pressure drops low, check gauge light on, the goes back to normal - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

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  #1  
Old 02-10-2014, 08:16 PM
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tdiraq tdiraq is offline
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2003 Chevy TrailBlazer LT
Summit White 4.2L I6 4X4
Join Date: Feb 2009
Location: Westminster, CO
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Exclamation Oil pressure drops low, check gauge light on, the goes back to normal

I know there are several threads about the low oil pressure problem but i haven't quite seen mine....When at a stop, i will accelerate then when it shifts gears the oil pressure drops to around 10, check gauges light comes on, then not even a second later oil pressure goes back to normal and check gauge light goes off. The rpm's are normal the entire time, i never noticed it under 600rpm at idle or rough or high idling. I've looked at other threads and am kind of confused to the main solution...

Ive read some people replace their oil pressure switch, the oil pressure switch connector, fuel pressure regulator, camshaft position sensor. Or simply cleaning the oil pump screen in the pan...any ideas guys? Thanks..

i have a 03 LT with 147k miles. No other previous problems that could be related to this. When this problem first started my serpentine belt was shot, belt tensioner was shot. I replaced both of them this am, but my oil pressure still drops randomly after accelerating from a stop.
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  #2  
Old 02-10-2014, 09:33 PM
Raymond Raymond is online now
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2003 Chevy TrailBlazer LTZ
Two-tone 4.2L I6 2WD
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I'm in the same boat as you with my 03 LTZ w/167,000. Mine started really acting up yesterday doing the exact same thing as yours. From reading through the post I'm going the route of replacing the camshaft position actuator solenoid this weekend which a number of other members have mentioned. Still considering rather I'm going to do the oil pump screen or not. This in addition to what I'd already planned on doing before the low oil pressure started yesterday.

Oil change
Fuel filter replacement
Replacement air filter
Throttle body cleaning

In the past two months I've thrown code p0014 twice which I'd received back in 2012 which was either low oil or it was really time for an oil change.
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  #3  
Old 02-10-2014, 10:32 PM
freddyboy61 freddyboy61 is offline
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2004 GMC Envoy SLE XL
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The oil pressure gauge on the I6 equipped vehicles is not a true indication of actual oil pressure. The sensor is only a switch (on/off), the PCM creates a displayed oil pressure based on the switch condition, which usually makes the gauge display about 40 - 50 Lbs. The only way to read actual oil pressure is to use a mechanical gauge.
As a first step, I would replace the oil pressure switch.
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Old 02-10-2014, 10:59 PM
Raymond Raymond is online now
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I did read earlier about it not being a true reflection of actual oil pressure. I will take your advice though and replace the oil pressure switch in addition to the things I was already planning on doing. Located the part on Amazon for $24 and some change which is about $17 cheaper than my local auto parts store.

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  #5  
Old 02-17-2014, 08:42 AM
mesprime mesprime is offline
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2002 GMC Envoy SLT
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Not sure if this is your issue, but my '02 is extremely sensitive to the type of oil filter used, even when it was new. Fram and some off brand filters will cause this exact set of symptoms. If the shop does not offer AC/Delco filter, I will bring my own to avoid this issue.
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  #6  
Old 02-17-2014, 08:52 AM
Raymond Raymond is online now
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I've actually used a Fram filter and never had an issue with it before. I have some time today so I'm replacing the CPAS and the oil switch today so we'll see what happens.
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  #7  
Old 02-18-2014, 07:51 AM
Raymond Raymond is online now
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Thank you freddieboy61 for the heads up on replacing the switch as that seems as if it was the issue. I'd already uad the cpas on order so I went ahead and replaced both of them in addition to everything else I'd already planned on doing. I'd say that the switch certainly failed by the amount of oil which looks to have came from it along with what was in the plug area.

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  #8  
Old 02-20-2014, 01:30 PM
Scott61663 Scott61663 is offline
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I have to had a problem with oil pressure on my daughters 02 envoy I changed the oil pressure sensor and still had the problem then I talked to mechanic and he said that he thought it was an oil pickup problem so I drained the oil and with the plug out I started flushing it with diesel fuel with each flush I was getting all kinds of crap. Changed filter and filled it back up and oil pressure stayed in normal operating range. Hope this helps


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  #9  
Old 02-20-2014, 01:47 PM
Scott61663 Scott61663 is offline
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2002 GMC Envoy SLT
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I forgot to mention that I ran some sea foam with the oil and ran it for a while then drained it out and put fresh oil in it and the oil pressure still fluctuated so that's when I started flushing it my only problem now is the oil filter is collecting all of the small partials so I have to replace the oil filter till I get the system totally clean


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