98 Grand Prix coolant leak around UIM - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 12-04-2009, 09:05 AM   #11
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Make sure that you replace those valve cover gaskets. When you go to purchase them buy the fel-pro brand, these should come with new rubber gromets for the bolts. If you buy a set without the grommets the old grommets will eventually leak.
There has been much debate about the recall that affected these cars. Us supergharged cars were recalled because the 'valve covers were leaking' but the non supercharged cars were only replacing the sparkplug wire clip. In eathier case it is not worth taking a change of the car catching fire. Replace the gaskets.
The engine mounts can safey be removed. The GP comes with 4 engine mounts, 2 on the top, 2 on the bottom. Just make sure that you don't start the car with them removed. The easiest way is to rock the engine forward and take out the bolt between the actuall dog bone and the bracket. This will then allow you to unbolt the bracket down by the vavle cover. When putting this all back togeather it is alot easier because then you only have to rock the engine forward and put in one bolt. If you have anyother questions let me know. I am over here visiting from clubgp.com trying to pick up some parts for my custom build on my GTP.
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Old 12-04-2009, 09:29 AM   #12
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Hey thanks for the tips.

I only have a GT - does this all still apply?
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Old 12-04-2009, 09:37 AM   #13
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Yup,

The vavle covers leak on all of them. Gm recalled the GTPs (supercharged cars) they replaced the FRONT valve covers and the plastic clip for the sparkplug wires. Then awhile later they recalled the GT'* and just replaced the plastic clip, they didn't do the valve cover.
From what I have seen on clubgp most of the gt guys still has issues with leaking valve covers, and went ahead and replaced them.
I have owned a bunch of GTPs over the years and replaced them all. On my last one I ordered valve cover gaskets that didn't come with new rubber gromets, and the oil still leaked out of there. That is why I told you to make sure you replaced those. The sets that come with them are arround the same price as the sets that don't.
If you are having trouble locating the gaskets for your job go to zzperformance.com They have all the gaskets there. They do not have valve cover gaskets with the gromets though.
Also, you can check out glubgp.com for more info about the fire recall, iirc it is under the general section. You should be able to view the pages without joining.
If you have anyother questions lmk
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Old 12-04-2009, 09:40 AM   #14
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What happens in the oil leaks out of the valve covers and goes down on the hot manifold, it will catch on fire. There has been ,uch debate if this is really the problem or not.
Some people think its the o-rings in the fuel injectors, other think it is the vavle covers, others think it is aliens, what ever the problem is you might as well take car of those valve covers while you got them off.
If you are confident you can replace the injector orings too, (they sell those at zzp) There is a write up on changing them on clubgp.
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Old 12-04-2009, 09:42 AM   #15
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Thanks for all the info!

One last question - how hard is it to change the rear valve cover? Unfortunately I already did the LIM - so I will have to tear down again. Hoping it won't be too bad.
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Old 12-04-2009, 09:45 AM   #16
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The rear valve cover is harder than the front, but not real bad. you can wratchet the engine forward using a wratchet strap and that will allow you to get in there fairly easily.

You already changed the lower intake gasket? And now you are just going to replace the valvecovers? Just so I know what you are planning on doing?
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Old 12-04-2009, 09:50 AM   #17
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Thats correct, I already replaced the lim gasket and the actual UIM with all the gaskets, pcv etc.

So now I'm just looking to replace the valve cover gaskets. Does the alt bracket need to come off or anything?
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Old 12-04-2009, 09:51 AM   #18
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The car is fully put back together - did all that stuff a few weeks back btw.
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Old 12-04-2009, 09:54 AM   #19
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http://www.cpaclubgp.com/misc/lim-gasket.html

This is a video of some guys doing a lim job on a GTP. In the video it shows how they take off the motor mounts, the bracket that is left and be then used to help wratchet the car forward to get at the back valve cover.
I would look arround your vavle covers and see if you have any crud build up under them, if you don't then you may just leave them alone. I personally would just keep an eye on it unless the oil buildup was really bad.
I didn't think you already did your lim job , and if that was the case it is really easy to do the valve covers when you have that appart.
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Old 12-04-2009, 09:56 AM   #20
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Yeah i know I probably should have done them when I did the LIM, but I wasn't feeling that confident about it. Oh well.

I have a slight oil leak - not sure exactly where its coming from so I figured valve covers would be a good start. Might also be the oil pan gasket but I doubt I'll be able to tackle that.
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