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Need Help UIM LIM repair squeal and smoke

 
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2001Ls
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PostPosted: Sat Apr 12, 2014 9:02 pm    Post subject:  Need Help UIM LIM repair squeal and smoke Reply with quote

I took off the UIM and LIM today. Installed new gaskets and reassembled. The first problem was a LOUD squeal at idle. I though it was a pulley but I read up on crank pressure issues and somebody suggested removing the dipstick. The noise went away immediately. I put in a new pcv valve because I thought maybe it was the problem but no. I ran the car for a while and now its still squealing unless I take the dipstick out. However, after a few drives with the new gaskets its started smoking fairly profusely out the tail pipe, cant tell if its oil or coolant. I can make the noise stop still by removing the dipstick but then the car smokes with it removed. I think this is crankcase pressure related obviously but I cant think about what would cause the pressure to be so wacky with a new pcv valve...im thinking maybe I screwed something up with the LIM UIM gaskets or my other idea is I connected a vacuum line wrong somewhere. I spent all day on this and its night time here in NJ so im sitting on it for the night, but any help would be appreciated.

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Frank
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PostPosted: Sat Apr 12, 2014 10:34 pm    Post subject:   Reply with quote

Did you use an AC Delco PCV valve? There are also one or two o-rings (I forget which) and a spring that need to be reinstalled when you put the PCV valve back in under the MAP sensor.

It's been about eight years since I pulled my UIM and LIM apart so I don't remember how everything goes together. You replaced the coolant elbows and torqued the tensioner and throttle body on properly and didn't forget the TB gasket, right?

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PostPosted: Sat Apr 12, 2014 10:52 pm    Post subject:   Reply with quote

Oil is dark, dirty smelling smoke. Coolant is white or light grey, sweet smelling smoke.


Are there any hidden cracks on any vacuum lines? They will often crack at 90 degree bends or right at connection points.

I can't help you beyond that with troubleshooting.

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2001Ls
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PostPosted: Sun Apr 13, 2014 5:12 am    Post subject:   Reply with quote

I pulled off the UIM again today and found this.







It looks like its coming mostly from the egr area. The pcv area looks dry which I would imagine would be the place where oil could be coming from. Need help here.


Frank : Yes I used a delco pcv and the o ring is intact as well as the spring, tb gasket is there and only one coolant elbow was replaced as I didnt remove the tensioner only the LIM. Is there any way I can find the leak location, If I can figure out what it is I can fix it. Its just wierd how the pressure in the engine is squealing.

LING: Its really difficult to tell if its coolant or oil, it kinda light grey but not sweet and not too sooty. Im just hoping its not a problem internally with the new LIM gaskets.

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PostPosted: Sun Apr 13, 2014 8:31 am    Post subject:   Reply with quote

Also, it looks like the rear bank is full of oil in the lower intake. Did you you use a thread locker/sealer on the thru bolts? I also had a problem with a defective gasket/new UIM that I had purchased.
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2001Ls
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PostPosted: Sun Apr 13, 2014 9:48 am    Post subject:   Reply with quote

yes I used thread lock. I took the lower off again and im using rtv this time. Going to take my time and make sure the lower intake gasket seats properly then put the top back on. Im hoping its just something wasnt seated correctly and it will be fixed with a more presise install. IDK what else to do, I cant think of any other reason except for a gap somewhere so my best idea is just to redo it and do it more thouroughly

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PostPosted: Sun Apr 13, 2014 12:12 pm    Post subject:   Reply with quote

There is a thread sealer, use that and not RTV. It smells just like caulk but when it dries it is not flexible. If you used the aluminum gaskets just suck all the oil out and pull the thru bolts out 1 by 1 and clean the hole out and use the sealant. Retorque the whole LIM.
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PostPosted: Sun Apr 13, 2014 2:40 pm    Post subject:   Reply with quote

Thanks 98. I just did the job over basically, pulled manifolds resealed everything and torqued in order. Bleeding the cooling system now but no smoke and no whine so far. I'll post again a little later, this 36 hour nightmare im hoping is over so im taking a break.

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PostPosted: Sun Apr 13, 2014 11:15 pm    Post subject:   Reply with quote

2001Ls wrote:
yes I used thread lock. I took the lower off again and im using rtv this time.


Did you not use RTV the first go around?

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PostPosted: Mon Apr 14, 2014 7:40 pm    Post subject:   Reply with quote

Bah, s**t happens with cars. I hydrolocked the motor overnight because of a bad gasket (upper intake)
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PostPosted: Mon Apr 14, 2014 10:04 pm    Post subject:   Reply with quote

Iffy- I did use RTV just not as much and my torque job wasnt too great


It seems to be fine now. I basically RTVd everything on the upper and lower and torqued in the right order and did a thorough tightening job. On a side not I somehow cracked my radiator at the upper hose during this job so now a TYC radiator is in the mail from rock auto....another "Oh this will take 3 hours" job like I thought the gaskets would be that turns into a weekend long night mare most likely.

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PostPosted: Mon Apr 14, 2014 11:42 pm    Post subject:   Reply with quote

2001Ls wrote:
Iffy- I did use RTV just not as much and my torque job wasnt too great


Yeah, torquing those suckers down is critical. At least you caught the problem relatively quickly and don't have a blown engine.

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