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LQ4 leaking at the rear of the engine

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Old Nov 7, 2022 | 11:13 AM
  #11  
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I mean hypothetically yes the throttle body can leak coolant into the intake but I doubt it, you'd have to have an internal crack.
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Old Nov 8, 2022 | 09:24 AM
  #12  
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Well last night when I got home I bypassed the throttle body coolant hoses with a barb fitting coupling. I hooked up that Lisle coolant reservoir and filled it halfway with water. I definitely had a lot of bubbles in the beginning, but eventually no bubbles even after revving the engine. I temporarily unhooked the PCV valve and blocked the hose and ran the engine for 2k-3k RPM. The smoking stopped. I reconnected the PCV valve before calling a day. I think I'll go ahead and replace the PCV.

I drove it to work this morning and all seems back to normal. Weird.

Last edited by strutaeng; Nov 8, 2022 at 02:14 PM. Reason: clarification
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Old Nov 8, 2022 | 09:25 AM
  #13  
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Strange
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Old Nov 8, 2022 | 01:55 PM
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Originally Posted by strutaeng
Well last night when I got home... and ran the engine for 2k-3k
You drove 3000 miles in less than 24hr's



Wonder if the new designed valve cover with the baffle would help keep the PCV out of the oil vapor?
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Old Nov 8, 2022 | 03:12 PM
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New valve cover and valley cover perhaps
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Old Nov 8, 2022 | 09:17 PM
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Originally Posted by shakenfake
New valve cover and valley cover perhaps

There's a newer (updated?) valve covers? I did put a valley cover gasket.

I went to take a peek from the wheel well and still see the oil in the same spot. My daughter had a volleyball game in the finals and they lost, so I'll crawl under there tomorrow, but I think you are right! I'll order that rear main alignment tool and and seal.

I was hoping to change the R&P on my 99 'cause it's been leaking for a while over Thanksgiving... guess I'll do two jobs for the price of one. :-)

Thank you all for your input. I'll keep y'all updated.
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Old Nov 9, 2022 | 07:42 AM
  #17  
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Yes there are updated valve and valley covers. Been out for years now, I never really see anyone swap valley covers though.

Sometimes I just got dat knowledge, sucks though
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Old Nov 12, 2022 | 10:03 PM
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Originally Posted by shakenfake
Yes there are updated valve and valley covers. Been out for years now, I never really see anyone swap valley covers though.

Sometimes I just got dat knowledge, sucks though

Good to know! I got the alignment tool in the mail. Thanks! I ordered the Felpro rear seal/gasket. I think it'll be here on Wednesday. My Suburban doesn't fit inside my garage, so I'll have to do this in my driveway. Of course, now it got cold....😒

Since I really didn't have anything to do I decided to keep working on cleanup on the 4L80e I'm rebuilding for my brother's truck 90 C1500. Kinda tedious job.

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Old Nov 13, 2022 | 12:51 PM
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That last picture almost frightens me lol

Hat's off to those that can rebuild automatic transmissions
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Old Nov 13, 2022 | 04:56 PM
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If it makes you feel better I also did this job in the cold. Buy a tail shaft plug. I spilt ATF all over my working area so I got to lay in ATF

Also that’s how I blew my trans lol
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