How do I know if UIM has been replaced and manufacturer? - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 03-17-2006, 01:06 PM   #11
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If your intake was replaced in 04, and only has 2 dials for the Date... I will assume that its a Dorman intake...

Does you intake by chance say DelPhi in this area?


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Old 03-17-2006, 01:25 PM   #12
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Thanks for all the GOOD info. Lash, I am sorry but there are NOT three dials. I checked again this AM and it only has TWO. And yes I did read the article. Jr....I don't have the delphi sticker. I guess this means I must have the Dorman intake? Any other thoughts on this? Thanks again for all the help!! Chad

PS: Are the Dorman intakes the best out there? When should I be looking at replacing??
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Old 03-17-2006, 01:36 PM   #13
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Sorry if I gave you a bum lead on the date stamps. I was NOT aware that the Dorman only used year and month.

Anyway, based on that info, you had yours replaced in 2004. As far as how often to replace there are at least two schools of thought. One says to be safe and replace every 60,000 just in case, the other says to keep a good eye on your coolant use and your engine and it will tell you when it'* time.

On the other hand, I don't know if we have any good record of failure on the Dorman intakes yet (if any). They are definitely stronger with more meat at the failure area and more air gap around the EGR tube. I would guess that jr's3800 and or willwren know the most about this aspect.
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Old 03-17-2006, 02:03 PM   #14
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Id say if you make it 5 years its time to replace the intake... It will give you piece of mind at the least...

I had the Delphi unit that was in the Pic... It made it 6 years, At which point I did not trust it any longer... I decided to get the Dorman and replace the lower gaskets while I was there too... After removing the old UIM I was glad that I had decided to do the replacement.. The Delphi unit was degraded, and I don't think i would have made the 1000 mile trip up and 1000 mile trip bac...

Bill Buttermore and Bob Dilion( I hope I got it right this time Bob ) have come up with some very good ideas as to correcting the problem.. I would just about call it a cure..

But in the futuer we are going to see more of these 3800 Series II L36 engines with upper intake issues...

Good Luck

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Old 03-17-2006, 02:07 PM   #15
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Quote:
Originally Posted by lash
.... and more air gap around the EGR tube.
I believe the EGR bore diameter (ID) on the Dorman is the same as the Rochester or Delphi - just a little over .750". The new Dorman kit comes with a reduced diameter stovepipe (.510 pipe, .624 base) that will provide a .125 air gap for 99+ engines. If the stock 99+ GM pipe is re-used, the gap is about .065.

For folks with 95-99 engines, and a stock .750" stovepipe, the gap is just a few thousandths. That is why we recommend a reduced diameter stovepipe - to get some space between the hot pipe and the plastic. I also recommend reaming the bore for a 7/8" sleeve so you won't have to do the job again.

Radchad, Bob Dillon will sell you a sleeved upper. I will sell you a reduced diameter stovepipe for $10. If you want to sleeve your own upper as shown in the link above, I will sell you a sleeve for $5.

Lash, or Don, please correct me if I'm wrong on that Dorman EGR bore size.
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Old 03-17-2006, 02:14 PM   #16
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Quote:
Originally Posted by bill buttermore
Quote:
Originally Posted by lash
.... and more air gap around the EGR tube.
I believe the EGR bore diameter (ID) on the Dorman is the same as the Rochester or Delphi - just a little over .750". The new Dorman kit comes with a reduced diameter stovepipe (.510 pipe, .624 base) that will provide a .125 air gap for 99+ engines. If the stock 99+ GM pipe is re-used, the gap is about .065.

For folks with 95-99 engines, and a stock .750" stovepipe, the gap is just a few thousandths. That is why we recommend a reduced diameter stovepipe - to get some space between the hot pipe and the plastic. I also recommend reaming the bore for a 7/8" sleeve so you won't have to do the job again.

Please correct me if I'm wrong on that Dorman EGR bore.
As far as I know, you are correct and I wasn't careful enough with my post. I should have stated the whole detail as you have above. I meant that the net result of a Dorman kit install is a larger air gap.

Thanks for clearing that up for me, Bill.
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Old 03-17-2006, 02:35 PM   #17
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Thanks everyone for their help, this is great info!! No problem Lash about the info....I just kept wondering where else to look!!! So is it safe to say, I can wait several years and then do the Bob Dilion mod/UIM? I watch my coolant level fairly closely! Thanks again for everyone'* input!! Chad
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Old 03-17-2006, 02:48 PM   #18
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I would think yes.
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Old 03-17-2006, 03:57 PM   #19
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Quote:
Originally Posted by lash
I would think yes.
Agreed I would have to say yes as well...

Check the coolant as much as you chek the oil and you should be ok... Open the hood once a week at the least have a looky loo

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Old 03-17-2006, 05:33 PM   #20
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So when these things go, is it an obvious decrease in coolant level. I notice small fluctuations in the coolant level as it is. Do you just check the level at the same time, all the time, ie. when first starting or after enigine is up to running temp? Thanks again!! Chad
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