Leaking Intake manifold gasket, 2002 S-10, 4.3L - S-10 Forum
 
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post #1 of 27 Old 11-28-2007, 05:11 PM Thread Starter
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Leaking Intake manifold gasket, 2002 S-10, 4.3L

How many of you guys had to replace the intake manifold gasket on your S-10's due to it leaking?

I had to do mine on my S-10, 4.3L at 61,000

I've read on the web that Dexcool caused gasket problems.

Thank you,....marc

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post #2 of 27 Old 11-28-2007, 05:34 PM
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Re: Leaking Intake manifold gasket, 2002 S-10, 4.3L

My brother-in-law and I replaced mine on my 2000 back in February. Not too difficult of a job.

I don't know if dexcool was the problem or not. I was just driving to work one day and the engine started feeling sluggish and then died. I had it towed home after work and started checking it out and saw the sludge on the dipstick. I knew what it was immediately.

When we took the intake manifold off this is what we found...

By the time you realize this doesn't say anything it's too late for you to stop reading it.
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post #3 of 27 Old 11-28-2007, 07:06 PM
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Re: Leaking Intake manifold gasket, 2002 S-10, 4.3L

I replaced mine at about 81,000mi, it was leaking at the front just behind the A/C compressor, it had the factory gasket and I used a Fel-Pro gasket, it's a strong metal base with big rubber openings, and I will say use that one, because alot of people do without any problems.

Make sure you torque up the bolts in 3 steps to the proper torque and don't mess up the sealant you have to use on the ends when you place the manifold back on because it will leak if it is not a good seal.

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post #4 of 27 Old 11-30-2007, 08:32 AM
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Re: Leaking Intake manifold gasket, 2002 S-10, 4.3L

Its a very common problem on these motors. Just did mine at 49,000 miles. Dont know if its the dexcool that does it or just a poor choice in the material that the gasket is made out of. But the replacement upgraded fel-pro gaskets should last alot longer. But i would recommend if anyone does replace anything cooling system wise to flush out the dexcool and put in regular green antifreeze cause gm did find out that dexcool promotes corrosion to aluminum parts. Thats y they dont use it anymore. So ive been told by a gm tech.

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post #5 of 27 Old 11-17-2010, 02:08 PM
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Re: Leaking Intake manifold gasket, 2002 S-10, 4.3L

I'm looking at buying a 2002 with the intake manifold gasket leak and bad cats.

If there was a leak would that cause major problems with the rest of the engine?
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post #6 of 27 Old 11-17-2010, 04:08 PM
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Re: Leaking Intake manifold gasket, 2002 S-10, 4.3L

Sorry to jack your thread but I think im about to tackle the same repair.. I just had a question

Is it possible for the coolant to leak inside the engine, and not mix with the oil? I have disappearing coolant and my oil looks fine but the level is very high.. What are the chances that this is a cracked head and not a lower intake manifold gasket? Thanks and sorry again

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post #7 of 27 Old 11-19-2010, 04:17 PM
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Re: Leaking Intake manifold gasket, 2002 S-10, 4.3L

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Sorry to jack your thread but I think im about to tackle the same repair.. I just had a question
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Is it possible for the coolant to leak inside the engine, and not mix with the oil? I have disappearing coolant and my oil looks fine but the level is very high.. What are the chances that this is a cracked head and not a lower intake manifold gasket? Thanks and sorry again



I had the same problem at 40,000 miles in a 2000 sonoma 4.3. Turns out it was the bolt in the intake behind the a/c compressor. When it came loose somehow it caused the plastic intake gasket to melt and eventually crack. I lost about a gallon and a half before i noticed and water in the oil, but when i did the oil looked like butterscotch pudding.
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post #8 of 27 Old 04-15-2011, 11:59 AM
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Re: Leaking Intake manifold gasket, 2002 S-10, 4.3L

I'm looking at buying another S10 and the owner said that at 110k miles he developed an intake manifold leak and there was a ticking sound too.

Any ideas if what that might be?
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post #9 of 27 Old 04-15-2011, 02:51 PM
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Re: Leaking Intake manifold gasket, 2002 S-10, 4.3L

I just changed mine at 253,000. It was leaking at the corners, but never got into the oil. The plastic around the water passages crumbled. I haven't used Dexcool since '99.
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post #10 of 27 Old 04-16-2011, 07:56 PM
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Re: Leaking Intake manifold gasket, 2002 S-10, 4.3L

Changed mine at 95K. It was leaking into the oil, and down the tranny bellhousing. Its not that bad if your mechanically inclined....its just time consuming.

And its not totally the Dexcool. Its part dexcool, part faulty plastic that makes up the gaskets. GM has since redone there gaskets with a new metal frame to deal with the degrading plastic issue.

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post #11 of 27 Old 04-21-2011, 01:05 AM
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Re: Leaking Intake manifold gasket, 2002 S-10, 4.3L

notorious s10 problem. i replaced mine at 100xxx miles on my 98. leaked in front as well. took me 4 hours.
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post #12 of 27 Old 04-21-2011, 04:10 AM
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Re: Leaking Intake manifold gasket, 2002 S-10, 4.3L

coolant CAN leak straight into the intake chambers and mix with the fuel. you'd prob see some smoke though... one way to tell. pull your plugs. if they look "clean" instead of carboned/burned/used, you prob have coolant leaking into the combustion chamber.

if coolant is in the oil, it will mix, and you'll def be able to see it.

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post #13 of 27 Old 08-14-2011, 08:31 PM
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Re: Leaking Intake manifold gasket, 2002 S-10, 4.3L

My coolant is leaking somehow into my motor. But it doesnt mix with the oil to create the "milkshake" like most have. when i remove the drain plug, the oil comes out first, but then suddenly turns into coolant. can anyone explain why they dont mix together?

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post #14 of 27 Old 08-15-2011, 02:16 AM
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Re: Leaking Intake manifold gasket, 2002 S-10, 4.3L

probably just has to do with the type/brand of coolant you are using. if ANY coolant is coming out of the oil pan, you have a major problem (intake gaskets and/or head gaskets) that needs to be fixed asap. i wouldnt drive it until it is fixed.

how do you know coolant is in the oil. is it obvious when you drain the oil. can you give us a pic, or a better description of what you're seeing?

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post #15 of 27 Old 08-22-2011, 08:52 PM
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Re: Leaking Intake manifold gasket, 2002 S-10, 4.3L

Its obvious. As in... Oil comes out... then brand new coolant like its being poured out of a jug, lol. And im not driving it. Its just sitting. Probably just going to sell it how it is to get it out of my garage.

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post #16 of 27 Old 09-20-2011, 02:49 PM
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Re: Leaking Intake manifold gasket, 2002 S-10, 4.3L

I just did mine at 160,000. Wasn't too bad, the worst part was cleaning out all the butterscotch oil from everything. All four corners were shot. I ended up doing 2 oil changes within an hour of getting it back together. Everything seems fine now.
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post #17 of 27 Old 09-20-2011, 05:45 PM
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Re: Leaking Intake manifold gasket, 2002 S-10, 4.3L

This issue is typical with almost all GM motors from this period. Changing the gasket and using green antifreeze is the suggested repair. Dex-Cool was known for causing premature failure of intake gaskets by dissolving the gasket material. Supposedly the formula was changed but, I would not trust it with an enemies motor. Let alone my own. I have had three motors with this same issue and the suggested fix has been holding up just fine. More than 100000 miles later.

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post #18 of 27 Old 09-22-2011, 12:26 AM
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Re: Leaking Intake manifold gasket, 2002 S-10, 4.3L

Quote:
I replaced mine at about 81,000mi, it was leaking at the front just behind the A/C compressor, it had the factory gasket and I used a Fel-Pro gasket, it's a strong metal base with big rubber openings, and I will say use that one, because alot of people do without any problems.

Make sure you torque up the bolts in 3 steps to the proper torque and don't mess up the sealant you have to use on the ends when you place the manifold back on because it will leak if it is not a good seal.
exactly like mine, (same spot for the leak) but mine made it to 140k

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post #19 of 27 Old 11-21-2011, 04:03 PM
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Re: Leaking Intake manifold gasket, 2002 S-10, 4.3L

yeah mine is leaking at 122,000 but i am doing my manifold and value cover gaskets to at the same time. it just seem to be easier
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post #20 of 27 Old 11-21-2011, 05:58 PM
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Re: Leaking Intake manifold gasket, 2002 S-10, 4.3L

Felpro Gaskets for the win.

its a normal problem with the 4.3's and the 5.7's. did the tahoe a few months back. pretty straight forward.


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post #21 of 27 Old 11-25-2011, 12:05 AM
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Re: Leaking Intake manifold gasket, 2002 S-10, 4.3L

My 2000 s10 zr2 stutters at low rpm and more so when it is cold and gradually getsw better throughout the day. i know i need an intake gasket repair. the CMP retards to -14, shouldnt this be around 0 ? Would that make the engine stutter? the service engine light all the cyclinders are misfiring. can anyone help? thanks
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post #22 of 27 Old 11-26-2011, 10:11 AM
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Re: Leaking Intake manifold gasket, 2002 S-10, 4.3L

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Originally Posted by BATMAN View Post
I'm looking at buying another S10 and the owner said that at 110k miles he developed an intake manifold leak and there was a ticking sound too.

Any ideas if what that might be?

i have a 1997 s10 with a 2.2 liter and its ticked ever since ive had it, i bought it with 94,000 miles and its got 137,900 now runs as good as ever
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post #23 of 27 Old 07-04-2013, 03:35 AM
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Re: Leaking Intake manifold gasket, 2002 S-10, 4.3L

For my 2002 S10 2.2L vortec, I got the Volant intake for $170. Very happy with it. Nice sound and seemed to add a little extra HP. Also did the Taurus fan mod. well worth it. Considering upgrading the alternator to an AD244 and doing the big 3 upgrade
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post #24 of 27 Old 01-25-2016, 09:27 PM
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Re: Leaking Intake manifold gasket, 2002 S-10, 4.3L

I have a 2001 S-10 with 4.3. Replaced the water pump but wasnt the problem. It appears to be leaking behind the altenator. Could this also be the intake gasket? Please help. My brother is going to take off altenator tomorrow.
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post #25 of 27 Old 01-26-2016, 12:16 AM
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Re: Leaking Intake manifold gasket, 2002 S-10, 4.3L

That is what mine looked like. Coolant seeps from the corners of the intake manifold showing up as drips, or leaks into the motor oil, causing damage.
2003 sonoma 4.3l.
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post #26 of 27 Old 01-26-2016, 11:05 PM
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Re: Leaking Intake manifold gasket, 2002 S-10, 4.3L

Same here, 2002 w/130k before she started leaking behind the alt at the corner of the manifold, it was about to start leaking onto the cam, at two different points..... It's a combo of a really crappy gasket and dexcool. Def spring for the Fel-Pro upgrade, you'll clearly see the difference in quality! Pretty straight forward, I had a hard time getting the damn wiring harness out of the way, other than that easy. Take your time and torque everything correctly!
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post #27 of 27 Old 02-01-2016, 02:32 PM
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Re: Leaking Intake manifold gasket, 2002 S-10, 4.3L

Quote:
Originally Posted by vinster888 View Post
This issue is typical with almost all GM motors from this period. Changing the gasket and using green antifreeze is the suggested repair. Dex-Cool was known for causing premature failure of intake gaskets by dissolving the gasket material. Supposedly the formula was changed but, I would not trust it with an enemies motor. Let alone my own. I have had three motors with this same issue and the suggested fix has been holding up just fine. More than 100000 miles later.
Dexcool has changed it's formula, it no longer carries a plasticizer in it. Be careful though, the Prestone formula last I checked still carried the plasticizer in both their Dexcool and universal replacement version. At a local dealer they had both versions of Dexcool on the shelf.

I use a long life mixed fleet diesel/gas HD antifreeze that works really well for me.

An important thing to do is to check the 'warning' label if it has anything but ethylene glycol listed, and it's a salt(can't remember the name at the moment), it's got the plasticizer and you should not use it.
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