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  #11  
Old 01-25-2010, 07:33 PM
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rrufast rrufast is offline
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2002 Chevy TrailBlazer LS
Summit White 4.2L I6 4X4
Join Date: Feb 2008
Location: Myrtle Beach, SC
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Thanks for letting me know...
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  #12  
Old 05-09-2012, 12:36 PM
juniortj juniortj is offline
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2002 Olds Bravada
Graystone Metallic 4.2L I6 AWD
Join Date: May 2012
Location: San Diego, CA.
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oil pressure low

Hello mbergh,
can you tell me if the part that you replaced is only the flat ended cap, or the whole part where the cap is located.
thank you so much
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  #13  
Old 05-30-2012, 09:11 AM
Tatonka Tatonka is offline
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2002 GMC Envoy SLT
Custom 4.2L I6 2WD
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Location: Florida
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Juniortj,

I can't figure out where the vacuum cap is on the intake manifold. If you found it can you take a picture and post it here? I pulled air intake out this past weekend, as mentioned above, but couldn't find a flat ended cap. I'm perplexed.

Thanks.
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  #14  
Old 11-03-2012, 09:55 AM
Rhoadesman Rhoadesman is offline
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2002 Olds Bravada
Monterey Maroon Metallic 4.2L I6 AWD
Join Date: Nov 2012
Location: Tulsa, OK
Posts: 0
Please Help

Mbergh, Juniortj or Tatonka,
My oil pressure is doing the exact thing that mbergh described. However, I am not very wise when it comes to motors. Could one of you please describe in great detail or even take pictures of this vacuum cap on the intake manifold and how to get to it?
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  #15  
Old 02-20-2013, 07:47 AM
Craig Moore Craig Moore is offline
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2002 GMC Envoy SLT
Black 4.2L I6 4X4
Join Date: Feb 2013
Location: Rome, GA
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Question about this Problem:

Quote:
Originally Posted by mbergh View Post
Unfortunately I put everything back together so I do not have a photo. On my Bravada the top of the engine has an airbox which is attached to the throttle body. if you take this off it exposes the intake manifold (a large oblong metal cannister on the drivers side of the engine. On the top of the intake manifold is a vacuum fitting with a flat ended cap. it is the only one there so it's easy to locate- it is towards the front of the intake manifold. Anyway. it gets old, hard and cracks due to its location on the top of the engine. I'm sure it did not help that I lived in Las Vegas from 2002-2008 and the dry heat contributed to its dryrot. i did not notice it before because the crak was on the bottom of the cap. Only when I rotated it did I see it was cracked and leaking. When replaced, the engine ran smoother and no oil pressure drop.
Hi mbergh, my name is Craig and i was wondering if you can tell me where this item is located so i can fix I have 2002 GMC Envoy that is doing the same thing.
thanks, Craig
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  #16  
Old 02-20-2013, 08:43 AM
mbergh mbergh is offline
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2002 Olds Bravada
Pewter Metallic 4.2L I6 4X4
Join Date: May 2009
Location: Aurora, IL
Posts: 38
Oil Pressure drops off

First- I have the In-Line 6 engine. I'm assuming you do too. Well, I've been told it's because the main bearing is worn and I still will have a problem with it when it's warm outside and I run the AC compressor, so they may be right. However, without the compressor on and good oil & a treatment added, I have no problems. It all started when I moved back to Illinois from Las Vegas. Out there, it's hot and very dry. The biggest problems is dry rot of rubber components. Had motor mount issues, suspension issues (including having to replace both rear air springs (self-leveling system) and other things. Anyway, when I came back, it got to 5 degrees F and one day I went to start the truck and it ran like a bag of worms. Knocking, surging and having trouble idling. That's when the oil pressure would drop when it was warmed up and I pulled to a light and it went to idle. It would drop off, warn of "oil pressure low" and "stop engine". If I gave it a little RPM, it was fine. Ended driving with two feet for awhile. One mechanic said it was a bad oil pump or oil pressure sending unit. A dealer said I needed a new engine. That's when I researched it more thoroughly. The air filter box is the wrong place to look. If you face the engine, there's a black plastic box on top of the engine (usually with the brand symbol on it). In the rear it's in-line with the intake to the throttle body. Just to the right, is an oblong black intake manifold. You do not need to remove anything. Just take your hand (while the car is not running) and feel on left side of the intake manifold towards the front of your vehicle. You can even see it. It's a black rubber cap sticking out horizontally. It covers a small test port for the intake manifold). It so a mechanic can hook up a tester to check vacuum. When that little cap gets old & cracks (gets exposed to alot of heat so it usually cracks underneath on the engine side), you lose vacuum. The effect is when your vacuum drops off at idle, it's signaling your vehicle it's shutting down. Hope that helps.
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  #17  
Old 02-20-2013, 09:12 AM
Craig Moore Craig Moore is offline
New Member
 
2002 GMC Envoy SLT
Black 4.2L I6 4X4
Join Date: Feb 2013
Location: Rome, GA
Posts: 0
Ok Thanks:

Quote:
Originally Posted by mbergh View Post
First- I have the In-Line 6 engine. I'm assuming you do too. Well, I've been told it's because the main bearing is worn and I still will have a problem with it when it's warm outside and I run the AC compressor, so they may be right. However, without the compressor on and good oil & a treatment added, I have no problems. It all started when I moved back to Illinois from Las Vegas. Out there, it's hot and very dry. The biggest problems is dry rot of rubber components. Had motor mount issues, suspension issues (including having to replace both rear air springs (self-leveling system) and other things. Anyway, when I came back, it got to 5 degrees F and one day I went to start the truck and it ran like a bag of worms. Knocking, surging and having trouble idling. That's when the oil pressure would drop when it was warmed up and I pulled to a light and it went to idle. It would drop off, warn of "oil pressure low" and "stop engine". If I gave it a little RPM, it was fine. Ended driving with two feet for awhile. One mechanic said it was a bad oil pump or oil pressure sending unit. A dealer said I needed a new engine. That's when I researched it more thoroughly. The air filter box is the wrong place to look. If you face the engine, there's a black plastic box on top of the engine (usually with the brand symbol on it). In the rear it's in-line with the intake to the throttle body. Just to the right, is an oblong black intake manifold. You do not need to remove anything. Just take your hand (while the car is not running) and feel on left side of the intake manifold towards the front of your vehicle. You can even see it. It's a black rubber cap sticking out horizontally. It covers a small test port for the intake manifold). It so a mechanic can hook up a tester to check vacuum. When that little cap gets old & cracks (gets exposed to alot of heat so it usually cracks underneath on the engine side), you lose vacuum. The effect is when your vacuum drops off at idle, it's signaling your vehicle it's shutting down. Hope that helps.
Ok thanks man that helps me out alot and thank you again all the things you said the mechanic told you. He told me the same thing so thanks again.
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