FIXED!! : Rough Idle getting rougher...found Coolant LEAK - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 06-21-2006, 03:39 PM   #21
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Quote:
Originally Posted by singscountry1967
Quote:
Originally Posted by jr's3800
Tracy, at this point I would reccomend just going in and replacing the lower gaskets and the upper intake just for piece of mind...

Using the upgaded alluminum lower gaskets, a new upper intake and new elbow... Hopefully that will give you 5 years of trouble free driving..
Yes, thank you. That'* the game plan - it was running so rough once it got warm that I haven't even been driving it this week (hitching rides to work). Some people here say, "drive it...it can't hurt anything its an external leak...drive it." But I'n not sure...my 6th sense tells me to play it safe."

Once I get the gaskets changed out, we'll see if that takes care of the roughness if it is related, or perhaps we'll accidentally find the vacuum leak. Not sure when I can get this scheduled, but I will update the post when done.
Yes you women have that 6th sense... Just don't know what it is with you ladies... You get a feeling and follw it and it usually works out...

A long time ago my dad was looking at Nissian Maximas... we found a black one loaded... We drove it and first thing she said was she had a bad feeling about that car... Boom.... There went the tire.... Salesman actually ran back to the dealership, got another car and a flatbed...LMAO... He decided that she was right and didn't buy that car...

Later He found a Honda Accord... Brough it home to show her... She got in it and said she liked the car... She said yes to the car, and it was the best car Dad ever owned

I brought my 95 Home and showed it to mom.... She had no ill feelings or reservations about the car... Even said it sounded good... I have had a few problems with the car as it aged, But its been a decent car for the abuse and milage...

Follow your gut... Don't do like us guys and drive it till it dies...lol

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Old 06-22-2006, 06:31 AM   #22
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I'm thinking the engine is sucking in air right where the coolant is leaking out; hence, your vacuum leak. I would change out both the LIM and the UIM gaskets at the same time. Make sure who ever changes out the gaskets doesn't forget to drain the radiator first. Doah!

jr'* 3800, what is this elbow that you are referring to?
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Old 06-22-2006, 08:00 AM   #23
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Great observation! Yes, the rough idle became more evident during the same miles that the coolant loss began to occur (the last 6k miles) - which is why I have that bad feeling about driving it. My local mechanic-guy Randy (actually, I think he'* an engineer for GM by day) said that the rough idle was likely being caused by the plentum (sp?) - another common failure for these engines. I'm taking the car over to him tonight. He knew the symtoms of my car before I even described them. Getting parts from my brother - works for a parts distributor (can you say discount?).

So...will change both UIM and LIM, plentum, thermostat, possibly the hoses depending upon their condition, will clean the MAF and throttle bottle too.

Comment made at the end of the conversation - "...well Tracy, you certainly know a lot about your car!" My comment was "...thanks to the BC Club!" Kudos to the club once again. This time last year I had no clue what a UIM or LIM was. If it were not for this club, I never would have noticed the coolant loss and likey would have run her till she puked.
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Old 06-22-2006, 08:45 AM   #24
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Tra cy....great news.

BTW..UIM = Plenum in his terms.
Make sure when the lower intake gaskets are picked up that they are the new style aluminum frame... (easy to tell..old are black frame, new are silver)
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Old 06-22-2006, 02:04 PM   #25
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Tracy this club has been a godsend for all of us.Looks like your getting somewhere.
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Old 06-22-2006, 02:22 PM   #26
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Quote:
Originally Posted by BillBoost37
Tra cy....great news.

BTW..UIM = Plenum in his terms.
Make sure when the lower intake gaskets are picked up that they are the new style aluminum frame... (easy to tell..old are black frame, new are silver)
Lesson of the Day... thanks! Too bad I didn't read this before talking to my bro when checking on parts.

QUESTIONS:
1) I want the entire Intake Manifold Kit - right? It includes:
Intake Gasket, throttlebody gasket, pcv valve, retianer, and o-ring, Vacuum Tee & O-ring. ....what is a vacuum Tee??? http://www.dormanproducts.com/cgi-bi...rid=0x001d9fda
There'* no pics of the gasket...but a description of the above kit from my bro was "reinforced in failure prone areas."

OR...do I only want to buy the gasket kits?

2) If I get the about kit, do I need to buy the Plenum (UIM gasket) separate? Or should it be included in the above mentioned kit? I don't see it listed in the description.

3) What about that elbow thingy.... what' * the name: intake elbow? Or would that be the vacuum tee thingamajig?

4) Coolant: Go with Prestone'* Universal instead of DexCool?

5) EGR issue: I gather that the reason for continued failures is that the heat from the EGR warps the gasket. Does the newer designed kit (#1 above) correct this issue? Or should I be looking to replace the EGR too? I ask because it looks like the manifold has already been replaced once.

Granted...I'm assuming Randy will know what he is talking about - but I like to know beforehand based upon yous-guys' experiences.
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Old 06-22-2006, 02:33 PM   #27
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1, yes taht looks like the right one... Should come with all gaskets necessary to replace the UIM. (I've always ended up with a few spare plastic pieces when I do an UIM. not really sure where they go.

2. should come with the UIM

3 elbow is between LIM and the acc bracket. if you plan to replace the LIM gaskets also (take off the LIM, then you will need a new one (GM dealer is easiest place to get one)

4 as long as it is dexcool. (it can be made by prestone) you should be fine.

5 I haven't read the thrtead so idk what has been discussed about hte EGR, but you should not have to replace the actual valve unless its bad. (which would throw a CEL)
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Old 06-23-2006, 01:06 AM   #28
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Dropped her off at Randy'* tonight...holy HUGE garage! It was bigger than the house (a ranch) and had lifts and everything! I'm thinking we need to befriend this guy so we can use his garage for mini-meet mods sometime.

So...he listens to the car run and says, "..that'* not a vacuum leak...that'* a misfire". Great... I gave him the lowdown on the maintenance I've done, he'll check her out tomorrow night and let me know what he thinks. He agreed w/Boosty (I think it was Boosty) that the area I found the oil & coolant looking substance was not a normal place for coolant to be... there was more wetness there - and I've only driven it the 20 mins it takes to get to his house.... stay tuned....
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Old 06-25-2006, 11:30 PM   #29
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She'* baaaaaccckk!!!

Rough Idle - cracked spark plug on #6. Ditchboy had trouble with that one...must have cracked it when installing it (back end - tough to get at). Stores were closed when this was found...moved plug to #3 spot - no missing at this time. Will replace asap.

Coolant Leak - LIM was cracked in three places. The UIM was very thin in a few spots as well. Luckily, the coolant leaked out up through the bolt where I could spot it.

Replaced at 59k miles:
LIM kit
UIM (aka Plenum!) gasket
OIl change (drats...too bad I just did it 600 miles ago. )

Preventative Maintenance:
Replaced Thermostat, Serpentine Belt, Top Radiator Hose
Cleaned TB and MAF
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Old 06-26-2006, 12:33 AM   #30
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Glad to hear it all went smooth. Good job with the extra PM stuff too. That should keep you running for a while.
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