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  #1  
Old 08-26-2016, 09:17 PM
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Dieseldiehard
 
Join Date: Oct 2002
Location: Bay Area No Calif.
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M112 INTAKE MANIFOLD FAILURE

OK, well I have a gasser, or make that two gassers, old DieselDieHard is in love with the 210 as I have been driving my wife's '99 E300 turbodiesel but she wanted a nicer car, after all the diesel was kept in the desert area where winds sandblasted the clear coat off it and the sun oxidized the silver paint.
So, I found a local E320, a 2001 sitting at a lot and as I had met the owner before he seemed a nice fellow and all so I asked if he was going to sell it, it basically had just arrived. He had $5900 and wouldn't budge but it had 92K miles and NO door dents, NO dings, NO body damage so I took it for a drive and it ran great I could detect a slight shake in the steering due to an unbalanced tire I presumed O/W it was a kick and I fell in love with the Lumbar seats! The only option I found missing was tilt mirrors when you select reverse.
OK he agreed to store it for a month while my wife was traveling so I bought it and had him store it. Flash forward a month I received the new plates and bought insurance and took possession. Well, within the first 15 miles a Check Engine light appeared. I stopped at my mechanic friend's shop and he said it had a string of resets and probably the EGR or switchover valve. But suggested a new MAF as one code showed a lean mixture and he knew the original MAF would need to be replaced eventually and this was as good time as any to install a new one.
OK, he reset the ECU put a new MAF and it was fine, I took it home and before I got home (6 miles away) the Check Engine light pops on.
I am thinking this is thermally related so back to his shop and he said I he needed time to dig into this one, the egr might be plugged or hanging up and the valve was cheap anyhow so he ordered a new one.
Pick up the car, no light and again about the time I get home ANOTHER Check Engine light!
So now he is really puzzled, as am I. I left it for him to ponder and knew my Indy was the right guy because he didn't want to charge labor for the return trip, he said this was a real puzzle and so on.
2 days later he calls me, saying I better come down and see what he found "on the manifold" so I drive over and he points a flashlight at the corners of the intake manifold and sprays some carb cleaner while the engine is idling and the RPM drops and it gets rough. So I have a corrosion or layering going on in the metal at the flanges where the 2-part manifold is bolted to the head.
I have a load of pics and hope someone can tell me WTF caused the metal to fail like it did?
There is no salt on the engine, it was sold out of Bakersfield CA, in the valley where the sun and sandstorms wold be the worst enemy of a car.
Its too late for factory recall anyhow the PO had the harmonic balancer repaired or replaced under an open campaign, as well as a few small things associated with locks etc.
I performed a careful search for anything related before preparing this thread but I could find nothing.
I wonder if this is a first?
This variable intake manifold is a stranger to me, gimme a M104 anytime. The V6 was supposed to be reliable, provided the harmonic balancer was addressed by the factory which this was so what am I going to find next?
BTW a new manifold set me back close to $1200 plus about 3 hours labor.
Maybe I should have stuck with Diesels!!?
DDH
Attached Thumbnails
M112 INTAKE MANIFOLD FAILURE-intake_crack1a.jpg   M112 INTAKE MANIFOLD FAILURE-intake_crack2a.jpg   M112 INTAKE MANIFOLD FAILURE-intake_crack2c.jpg   M112 INTAKE MANIFOLD FAILURE-intakemanifold.jpg   M112 INTAKE MANIFOLD FAILURE-intake_crack2.jpg  

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Last edited by dieseldiehard; 08-26-2016 at 09:28 PM.
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Old 08-30-2016, 03:35 PM
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ouch.. a new manifold is about 1200 or so, but Im sure you could have found a reliable used one for 20% of the price. They are not supposed to be took apart as you cannot find their center gasket.

btw - its the first time I have seen one broken like this.
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Old 08-30-2016, 10:43 PM
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I've never seen an M112 manifold fail like this, I think you could have found a good used one for $50. Did you really pay $1200 for a replacement manifold? You can buy a complete M112 junkyard engine for $400-$600 these days...
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Old 08-31-2016, 07:01 AM
Hirnbeiss's Avatar
ich fahre, also bin ich
 
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Location: South Florida
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This metal problem looks like what was happening to the valve covers on my '99 M112. It never broke through - just looked ugly.
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Old 08-31-2016, 11:07 AM
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Dieseldiehard
 
Join Date: Oct 2002
Location: Bay Area No Calif.
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Quote:
Originally Posted by TimFreeh View Post
I've never seen an M112 manifold fail like this, I think you could have found a good used one for $50. Did you really pay $1200 for a replacement manifold? You can buy a complete M112 junkyard engine for $400-$600 these days...
my error The manifold was $700 something the labor $500 Didn't want a used manifold considering all the labor if it too was bad (internally flaps) but if a clean manifold was available off a used engine I might have considered it. No time to hunt pick n pulls there are none around here anyways.
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  #6  
Old 03-20-2017, 04:55 PM
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Can anyone explain to me what is the role of the black plug from picture 4?
I am referring to the one above and to the left of the throttle plate location.
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Old 03-21-2017, 12:44 PM
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Quote:
Originally Posted by sharky View Post
Can anyone explain to me what is the role of the black plug from picture 4?
I am referring to the one above and to the left of the throttle plate location.
thats the connection for the vacuum line to the brake booster servo.
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  #8  
Old 03-21-2017, 05:31 PM
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Aha! And since i have the w211 version with SBC, then it means that the connection has to be plugged up, right?
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