Oil pressure - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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  #1  
Old 10-25-2017, 10:50 PM
jvmra jvmra is offline
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2007 Chevy TrailBlazer LS
Summit White 4.2L I6 2WD
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Exclamation Oil pressure

I have a 2007 Trailbazer. Has an problen that nobody has been able to solve. It has a complete rebuilt engine, oil pump, oil pressure switch, new spark plugs, new Fuel Injection Throttle Body Control Actuator Module, timing chain and accessories.
Buts since long ago, it keeps having problems with an oil pressure warning, as soon as the engine is hot and running the car, the oil pressure goes to zero suddenly and a yellow sign in the dashboard lights, so I step on the accelerator a bit and recovers oil pressure and warning light goes off, also noted that when RPM's are below 600 that happens. If the car is stopped that never happens, only if the car is moving.

Can someone have an answer on this?
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  #2  
Old 10-26-2017, 04:00 PM
EnvoyBoy2004's Avatar
EnvoyBoy2004 EnvoyBoy2004 is offline
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2004 GMC Envoy SLT
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Bad oil pressure sensor. Be aware that the oil pressure sensor on the 6 cylinder engine is just a on/off switch, ir does not actually read oil pressure. The PCM creates the reading on the oil pwessure gauge.

Replace the sensor and I am sure your problem will be gone.
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Old 10-27-2017, 08:57 AM
jvmra jvmra is offline
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2007 Chevy TrailBlazer LS
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Thank you EnvoyBoy2004. I gve to the mechanic a new oil pressure sensor when the engine was rebuilt, will check if that was done.

Regards

JVMRA
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Old 11-17-2017, 11:06 AM
micost micost is offline
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2005 GMC Envoy SLT
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Have the same problem so I shouldn't be worried?

Envoy 2005 4.2 pressure dips at red light not all the time but it's freaking me out so you mean it's probably a wrong reading (on/off)?
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  #5  
Old 11-17-2017, 02:11 PM
Redtblazer Redtblazer is offline
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Quote:
Originally Posted by micost View Post
Envoy 2005 4.2 pressure dips at red light not all the time but it's freaking me out so you mean it's probably a wrong reading (on/off)?
That happened to me and fixed with a new censor/switch.
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Old 01-07-2018, 09:46 AM
sniperwolf1988 sniperwolf1988 is offline
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2005 Chevy TrailBlazer LT
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oil pressure

Quote:
Originally Posted by jvmra View Post
I have a 2007 Trailbazer. Has an problen that nobody has been able to solve. It has a complete rebuilt engine, oil pump, oil pressure switch, new spark plugs, new Fuel Injection Throttle Body Control Actuator Module, timing chain and accessories.
Buts since long ago, it keeps having problems with an oil pressure warning, as soon as the engine is hot and running the car, the oil pressure goes to zero suddenly and a yellow sign in the dashboard lights, so I step on the accelerator a bit and recovers oil pressure and warning light goes off, also noted that when RPM's are below 600 that happens. If the car is stopped that never happens, only if the car is moving.

Can someone have an answer on this?
When the engine was rebuilt. Can you find out if it was a Melling oil pump.
If so and the original pick up tube was used it will not get the right oil pressure. Look at mellingoilpumps.com
And here is another thing we have found on the trailblazer's
THE DASH CLUSTER.. you may have a bad step motor for the oil pressure.
even it you put a manual Gage to make sure you have the right oil pressure but the Gage on the dash is saying 0 it would mean that the ECM is getting the signal reading of 0 pressure and the engine will shut down.
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