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Another Plenum Bites the dust - opinions, ideas, anyone?

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Old 08-15-2004, 07:28 PM
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Default Another Plenum Bites the dust - opinions, ideas, anyone?

First off I would like to say that this is a great forum, Keep up the good work. I hope to contribute as much as I can.

Now my story, After doing my annual tranny filter change I took it for a test drive - shifting through the gears manually to get the fluid moving I got about 3 blocks down the street when the engine died, I pulled her over and tried to start it again, it turned over a couple times and then locked up. I popped the hood and noticed the antifreeze overfill was empty. I then knew what happened. Got her home and pulled the spark plugs and sure enough yellow juice flowed out. So far I have pulled the the upper and lower intake and am cleaning stuff up. There sure is a nice hole in the upper plenum where the EGR stack sticks up (failure point). I have some nice pictures if anybody is interested.

I just hope that nothig else happined because of the hydolock. Im thinking since it only hydrolocked when I was trying to start it I may be OK. What do ya think?? It may be just hopefull thinking. I know she has a lot of rounds on her but she was running strong (mostly highway miles). I am going to do a compression check on it and see what they are at. Any idea what they should be at?
I am getting ready to buy all the stuff if the compression looks good. I need to decide where I am going to buy from, I have been very happy with gmpartsdirect website. I bought my struts from them last year.

What really pisses me off is that I was going to do the plenum back in Dec when I noticed my antifreeze was about an inch low in the overfill after filling it a couple weeks previous - but then it slipped off my priority list. Oh well if you can only turn back time.
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Old 08-15-2004, 07:34 PM
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Sorry to hear about the troubles.

As long nothing has cracked or broken you should be alright. The compression will help you decide. If its low pump a few shots of oil from a can in the cylinder and try again, this will rule out valves/heads.
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Old 08-15-2004, 08:54 PM
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Default You may be OK

I think you are in good shape. You may look at my message posted on August 5 (Intake failure in Puerto Rico) to see the similarity between your case and mine. Today my friend just finished installing the plastic intake and the car is back to normal.
I bought the Dorman intake from Northern Auto Parts thrue Internet and it cost only $158 delivered on 2nd day to Puerto Rico via UPS. This price included the gaskets. I did not remove the lower intake at all. I did an oil-filter change before starting the car. Also put a new PCV. Had a hard time starting the car, but it seemed to be that the spark plugs I had installed a few days ago were no good. Put a new set of plugs and it started. A lot of white smoke came out the exhaust for a while. Itt even stalled a couple of times but after erstarting and after a few minutes of the engine running (5-10 ???), the white smoke disappeared and it has beed doing fine since. Most probably I will do another oil change in a couple of days, and also may even change plugs again since i used cheap ones to see the engine would run OK. It looks nothing was bent or broken inside the engine. Thanks God.
I think you are even in better shape simce you do not emntion any heating up of your car. Mine heated up pretty bad. So good luck.By the way: my car is a97 SE.
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Old 08-15-2004, 10:29 PM
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Drain your oil immediately. Several of these failures have caused bottom end bearing failures within 6-12 months of the upper plenum failure. Due to rust on the lower block engine components.

I agree that you'll probably be fine, but I'd do at least a dry compression check just for the peace of mind.

Drain your oil TONIGHT.
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Old 08-16-2004, 12:00 AM
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Hey, Thanks for the replys.
I forgot to mention in my post that right after i pulled the plugs I drained the oil, because when i pulled the oil dipstick I seen that there was moisture on it, and yes when I drained it, first out came the oil then the antifreeze came out. It wasnt that much but it was enough for me to decide that i was going to replace the lower intake gaskets. I hope that what you say willwren wont happin to me - cross my fingers.

I think I will put oil in her before doing the comp test, it bothers me turning it over without oil in it. Thanks for the oil tip potiacdad. I recall doing that with my old pickup which i knew had bad valve seats it worked like a charm, finding the bad piston ring.

I am going to replace just about everything including the plug wires, I think they are original. What gives this away is the numbers on them for each cyclinder. I recall when I first bout the car I was going to change them and all I could find were 7mm wires local unless special order. The ones on there are 8mm. So i ddnt get any. Now im am going to buy, anyone know if I can get 8mm wires for this without breaking the bank. Again I think I will check gmpartsdirect. By the way when i bout this car from my boss it had 100,000 rounds on her - he was worried about the engine dying. He regrets it now after I put 70,000 more on her. In that time this is the worst thing that has happined, not counting the water pump last summer(bearing went out - it still pumped but very loud)
My point being she never left me on the side of the road.

Here'* my buy list:

lower Intake gasket kit
Upper plenum+gaskets
Valve cover gaskets
Plugs + wires
Tstat + Cap
PVC valve
EGR gasket

What am I missing, Hmmm.
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Old 08-16-2004, 02:00 AM
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Sorry to hear about the failure.At least yours went longer than some others before happening.------Regarding 8MM plug wires,I bought a set of BORG WARNER SELECT for my last car( 3800 series 1) at Pep Boys. I'm very sure they were 8 mm.Nice quality construction,wire wound center conductors and silicone jackets, and cost about 27 bucks.There was also a lower priced/lower quality Borg Warner wire available but the "SELECT" were real close to the factory wires.Never had a problem.Good luck.
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Old 08-16-2004, 02:11 AM
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To your "buy list" you might want to add : Ultra Black or some other good silicone sealent for the corners of the lower gaskets end seals.Loctite blue for the bolts.New injector o-rings.Any water pump bypass hoses or elbows that might need replacing.Motor manual with torque sequence and torques.---NOTE--- anybody heard about GM issuing new torque sequence and torques for the lower manifold?
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Old 08-16-2004, 12:16 PM
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Default failure

FYI check out my post on the job I did last week.
http://www.bonnevilleclub.com/forum/...ic.php?t=22897
Seriously consider changing the $8 lower intake coolant elbow too.
This little part will get you stuck on the road if it fails.....
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Old 08-17-2004, 05:08 PM
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Default Re: failure

Originally Posted by SSEBONNE4EVA
FYI check out my post on the job I did last week.
http://www.bonnevilleclub.com/forum/...ic.php?t=22897
Seriously consider changing the $8 lower intake coolant elbow too.
This little part will get you stuck on the road if it fails.....
Say, is this a dealer part or would napa have something like that.

I agree to replace that. It would be a bear if it failed. Has anyone had it happin?
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Old 08-18-2004, 09:20 AM
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Default Re: failure

Originally Posted by viton1
Originally Posted by SSEBONNE4EVA
FYI check out my post on the job I did last week.
http://www.bonnevilleclub.com/forum/...ic.php?t=22897
Seriously consider changing the $8 lower intake coolant elbow too.
This little part will get you stuck on the road if it fails.....
Say, is this a dealer part or would napa have something like that.

I agree to replace that. It would be a bear if it failed. Has anyone had it happin?
It'* a dealer part. Or, you could get it from gmpartsdirect.com.
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