Lots of sludge in intake manifold

[90coug]

It's only because these guys keep saying things about the engine that is wrong. I thought it might be me but then I came here and realized it wasn't.

[bszopi]

I take it you've never worked on one

You just won't give it up, will you?

Why is it the same thing, forum to forum? Some moderator controls everything you say.

Did you ever think that it is you, and not the moderators/site owners?

[90coug]

I don't remember any part of the TB arm fitting into the lower intake. I don't have any arms laying around though, just a couple 96 lowers.

I take it you've never worked on one

[SappySE107]

I don't remember any part of the TB arm fitting into the lower intake. I don't have any arms laying around though, just a couple 96 lowers.

[90coug]

I will be honest, I forgot that the coolant passage rested against the arm on the 96'+ intake arm.

Thats close to the 3800 SC TB gasket.

90coug IF you live in a warm climate, just by-pass the TB and run the heater hose and join the two hoses together to elimanate it.

But, still replace the gasket, cause it must be rough to be leaking coolant into the TB.

It's been replaced for some time now, and no you can't bypass it because part of the arm fits into the lower intake manifold.

[camgrinder]

Today I replaced to MAP and noticed a lot of build up on the inside of the peice the MAP mounts to. I could also see it on the inside of the manifold. So I stuck my finger in and pulled out a bunch of black, sticky, chunky sludge. I'm not sure if it's coming from something internal and being sucked back into the manifold through the MAP vac lines from some where else

The rough idle has gotten to the point where the tach and the oil pressure gauge bounce together. Four beats and revs up like "put put put put rev up, put put put put rev up".

I'm gonna open her up in the morning and clean it. See if I can't find where it's coming from. Don't know if I should try sea foaming the vac lines or not.

If anyone's got some input. Please, let me know. Thanx

ditto previous posts, that is either EGR exhaust buildup in the intake, and/or PCV buildup/oil film- the DOHC has 2 vacuum hoses that route crankcase vapors to the intake to be burned- it you have an engine with loose valve guides/seals and worn rings, it will push a lot of oil/crank vapors into the intake manifold, and will build up and actually start closing up the port passages- thats one thing I dont like about EGR and PCV systems, they are a 2 edged sword

[HayesPerformance]

I will be honest, I forgot that the coolant passage rested against the arm on the 96'+ intake arm.

Thats close to the 3800 SC TB gasket.

90coug IF you live in a warm climate, just by-pass the TB and run the heater hose and join the two hoses together to elimanate it.

But, still replace the gasket, cause it must be rough to be leaking coolant into the TB.

[SappySE107]

thanks for the gasket, that clears it up. Like I said, I have only done one.

Fuel is not in the upper intake or TB. Oil is there from the PCV and EGR is on so those 2 things equal the culprit. Coolant wouldn't help but it wouldn't be black.

I removed your post with attitude because im sick of newbies talking shit. If I wanted to control what was said, it would be simple. I co-own the site. To you its about being right. To me its about having the facts.

[90coug]

You wanna edit posts, ill do the same. I have about had enough of the newbie DOHC owners giving me attitude.

If there is coolant going through the 96-97 TB, then I am sorry. I only tore mine off once but I don't recall coolant going through the arm anywhere. Im not tearing it off my car again to check. Regardless, how does ingesting coolant equal black sticky chunks?

Coolant + dirt + oil + gas, I'm assuming can cause black sticky goo. I'm sure the coolant isn't the only culprit.

[SappySE107]

You wanna edit posts, ill do the same. I have about had enough of the newbie DOHC owners giving me attitude.

If there is coolant going through the 96-97 TB, then I am sorry. I only tore mine off once but I don't recall coolant going through the arm anywhere. Im not tearing it off my car again to check. Regardless, how does ingesting coolant equal black sticky chunks?

[90coug]

Sappy, you can edit my posts all day if you want. IMO you only did that beacuse you knew you were wrong. Why is it the same thing, forum to forum? Some moderator controls everything you say.

Anyway, here is the picture of the throttle body gasket, you will see the pocket below the big hole where the coolant flows.

[SappySE107]

There isn't a throttle body gasket on 91-95 and there is no coolant going through the gasket on the 96-97. The motor wouldn't have black sludge from coolant anyway.

[90coug]

my 3.4dohc contained a lot of sludge, I found out that the throttle body gasket had gone and the car was eating coolant (why there was so much sludge in the intake) Once fixed the sludge stopped forming and the car didn't smoke white

[HayesPerformance]

As a side point,

One way to REALLY cut the sludge down I have found on ANY vehicle is installing a oil catch can/oil seperator. I empty the one in my car at least once a month and you would not believe the crap that it catches from going into your intake. I'll take picture and post them next time I empty it.

I have it installed before the PCV valve and it stays perfect! Where I live it can get VERY cold and I found that when it is around -15 (and way lower) for awhile, it catches EACH WEEK a huge amount of oily condensation in the catch can.

I use them in my vehicles and the intakes, etc stay SO CLEAN!!!

By the way, BE VERY CAREFULLY if you buy the cheap ones cause they often DON'T hold vacuum, you need to "seal" the joints, etc with silicone and check with a vacuum gauge.

[LifefulDeath]

Found it! The rear vac line to the MAP. I found a patch in it and followed it back. Sure enough, it was melted. Replaced it and took her out. Cruise works. Vents work. Still a little bit of dancing in the tach. I'll reset the ECM in the morning. To cold out now lol

Thanx again guys