Intake Manifold Suggestions... - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


2000-2005 Discuss your 2000-2005 Bonneville SE, SLE, and SSEi Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Reply
 
 
 
Thread Tools Search this Thread
Old 03-22-2006, 02:10 AM   #1
Senior Member
Posts like a Camaro
Thread Starter
 
Join Date: Apr 2004
Location: Sioux Falls, SD. Member #2387
Posts: 907
Thanks: 0
Thanked 0 Times in 0 Posts
ten_gigahertz is on a distinguished road
Default Intake Manifold Suggestions...

As my car is creeping up in the miles, I'm getting more and more nervous about my lovely plastic intake. I feel like I'm driving a time bomb that is waiting to go off. My car has about 62k on it. Not exactly high miles, but getting up there in the range where the intakes start having problems (as far as I know).

Is it almost a better idea to start thinking about getting it changed now while I haven't been showing signs of it being bad?

I have been watching the coolant level pretty closely over the past year or so, just to make sure I'm not losing a ton all of a sudden. I have noticed that over the past year that I've lost about half an inch in the reservoir tank, maybe a shade more. I'm not sure if that'* normal, or signs of it starting to go. Or what are signs of it starting to go?

My question is, should I just bite the bullet and take it to the shop and say hell with it? Just tell them to replace the upper intake now? If I have them do it, should I have them replace the lower intake gasket as well (since they are big problems, and they'll be pretty close to it anyways)? Or am I just getting paranoid on the issue?

I'd just prefer to have my car last a good long time yet, and would rather pay $$$ now, instead of $$$$$$$$$ later. Just looking for your guys opinions on this, and to see what you guys have done with these issues. Thanks a ton.
ten_gigahertz is offline   Reply With Quote
Old 03-22-2006, 08:27 AM   #2
Senior Member
True Car Nut
 
toastedoats's Avatar
 
Join Date: Sep 2004
Location: Fitchburg Ma _ToastedRice_
Posts: 6,837
Thanks: 0
Thanked 0 Times in 0 Posts
toastedoats is on a distinguished road
Default

how many miles do you have on the car? There has not been a large percentage or 00+ with intake failures, nowhere near the extent that the pre-2000 have shown to suffer. Half an inch in six months in the resivior is NOTHING to be concerned about whatsoever
toastedoats is offline   Reply With Quote
Old 03-22-2006, 08:49 AM   #3
Senior Member
True Car Nut
 
Join Date: Oct 2005
Location: Central Florida
Posts: 7,030
Thanks: 0
Thanked 0 Times in 0 Posts
lash is on a distinguished road
Default

Mine actually went 120+K miles before failing, though I know that is higher than the average for the '96-99 intake failures. You have only 62K (again about average for the pre-'2000 failures), so I would suggest you just keep a good eye on things. Your car will tell you when it'* time, especially since you obviously DO keep a close eye on things.

If you were one that rarely to never opened the hood yourself, I might advise otherwise. When you do decide to do the UIM, I suggest you spend the extra and get those LIM gaskets replaced. I don't personally know how well they are holding up in the 2000+ 3.8Ls, but as far as I know the new improved GM LIM gasket didn't show up until 2005.
lash is offline   Reply With Quote
Old 03-22-2006, 11:44 AM   #4
DINOSAURUS BOOSTUS

Expert Gearhead
 
BillBoost37's Avatar
 
Join Date: Mar 2005
Location: Enfield, CT
Posts: 41,391
Thanks: 0
Thanked 0 Times in 0 Posts
BillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of light
Default

62K is not at the normal average replacement mileage yet. I think most see issues 80-120K. Most likely you have some time on the clock and that is good.

Doing it before it is required is the best way. Then you know water never got into the bottom end. Yes, there is no doubt in my mind after seeing an L36 with 75K on it that the lower intake gaskets should be changed. And the suggestion would be to get the lower intake gaskets from the dealer. Dealers are now stocking an aluminum frame gasket that superceded the original plastic frame gasket.

Bob Dillion is providing a good low cost sleeved UIM and the other choice to consider would be the Dorman/Motormite UIM
BillBoost37 is offline   Reply With Quote
Old 03-22-2006, 07:54 PM   #5
Senior Member
Posts like a Camaro
Thread Starter
 
Join Date: Apr 2004
Location: Sioux Falls, SD. Member #2387
Posts: 907
Thanks: 0
Thanked 0 Times in 0 Posts
ten_gigahertz is on a distinguished road
Default

Alright, sounds like I'm jumping the gun a bit.

If I'm still not losing much coolant come 75k or so, I'll probably start looking into getting at least the LIM gasket replaced, and maybe the UIM depending on what they say at the shop. Plus I would definitely take it to a dealer for something major like this, as they've probably changed a 1000 of them already.

Thanks for all the info on this.
ten_gigahertz is offline   Reply With Quote
Old 03-23-2006, 08:18 PM   #6
Mark Fahey
Guest
 
Posts: n/a
Default

I wasn't sure if I should start a new thread or just continue this one. On the L67, is there a consensus that the LIM should be changed before there'* trouble? If so, what would be a good mileage estimate?
Somehow I thought these engines were virtually bulletproof but apparently not judging by the bearing failures recently discussed.
  Reply With Quote
Old 03-24-2006, 08:40 AM   #7
DINOSAURUS BOOSTUS

Expert Gearhead
 
BillBoost37's Avatar
 
Join Date: Mar 2005
Location: Enfield, CT
Posts: 41,391
Thanks: 0
Thanked 0 Times in 0 Posts
BillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of light
Default

It'* actually the lower intake gaskets that degrade over time and the dex cool doesn't help. All the engines seem to have the lower intake gaskets degrade over enough time and mileage.

I changed mine at 140,000miles, while they looked bad, they weren't really leaking. There is a new aluminium frame gasket that GM superceded the old part with and we are hoping this fixes a good part of the issue.
BillBoost37 is offline   Reply With Quote
Old 03-24-2006, 08:59 AM   #8
Member
Posts like a V-Tak
 
Join Date: Oct 2004
Location: Cleveland to Hotlanta
Posts: 89
Thanks: 0
Thanked 0 Times in 0 Posts
Bonnie is on a distinguished road
Default

I just had mine changed at 82K miles. It was leaking pretty badly.
Bonnie is offline   Reply With Quote
Old 03-25-2006, 01:43 AM   #9
Senior Member
Posts like a Northstar
 
bonnevillemac's Avatar
 
Join Date: Sep 2004
Location: The Bluegrass State
Posts: 522
Thanks: 0
Thanked 0 Times in 0 Posts
bonnevillemac is on a distinguished road
Default

Some people may argue this, but this is what steps I have taken to help hold off this problem.

1. Added a 180* T-stat.

2. I took my car to a mechanic and had them do a complete flush and fill. It flushed out the entire block as well as hoses and radiatior. And then I had them fill it with green antifreeze. I use the Prestone that runs with any color. I just said Bye Bye to the dexcool.

Maybe this helps, I hope so,

Tim
bonnevillemac is offline   Reply With Quote
Old 03-25-2006, 01:53 AM   #10
Senior Member
True Car Nut
 
Join Date: May 2003
Location: Holt, MI & Lima, OH
Posts: 3,022
Thanks: 0
Thanked 0 Times in 0 Posts
dbtk2 is on a distinguished road
Default

I did a coolant flush on my '99 GP and I put in a 180* tstat, but I'm pretty sure my LIM gasket is already gone. I hope its been replaced before with the miles that are on it (205k), but if not that explains why it is bad. I am going to try the new revised plenum or maybe even the L26 plenum and see if that does anything.

But with 65k I wouldn't be worried. Like was said just watch your coolant like you said you do and if it starts losing more than normal then be worried. There is no sense in replacing something that doesn't leak now because replacing it now might cause it to leak. Just my $.02 though.

Shawn
dbtk2 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Series 2 Intake manifold for a Series 1(supercharged) S1ofDSS Performance, Brainstorming & Tuning 11 03-02-2003 05:53 PM
installed timing chain and intake manifold RZJNVB 1992-1999 5 02-12-2003 01:01 PM
USING SEALER ON INTAKE MANIFOLD? RZJNVB 1992-1999 22 02-08-2003 05:42 PM
Custom Intake Manifold Sol 1992-1999 6 02-08-2003 02:12 PM
3800 Series II intake manifold Custom88 General GM Chat 17 09-08-2002 10:58 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 10:06 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.