engine smoke?

[Dave1288]

my 2g eclipse is smoking bad when i get on the gas, but at idle it still smokes alittle at start up, its blue ish smoke by the way and i was wondering what u guys think is the problem

 

[numlock666]

blueish smoke is burning oil. So if you're talking about smoke comming out of your exhaust you have oil in you're A/F mixture also. Try checking your intercooler to see if its full of oil and is getting blown into your combustion. Or if you mean theres actually smoke comming from under your hood then oil is leaking somwhere onto something hot. Good luck!

 

[Dave1288]

thanks its got 128000 one it so ill clean out the intcooler

 

[kenamond]

I've answered this about 6 times in the past few days, but here goes again.

It might be your turbo. With a cool engine, pull the intake pipe from the compressor inlet and check for in/out and side/side shaft play. A bit of side/side is okay, but you shouldn't have any in/out. Excess shaft play means your turbo is fading.

Pull the LICP from the compressor outlet, clean the pipe and compressor out (oil will probably be there, but that's normal). Replace the LICP and intake pipe. Pull the valve cover breather hose off of your intake pipe and cap the nipple on the intake pipe (this removes the source of the oil you just cleaned up). Go for a drive and get on it enough to hit full boost and full oil pressure for a few seconds. Park it and check the LICP for more oil. If there is new oil in there, your turbo is leaking oil through the seals and is probably not far from death.

If it's not that, do a compression test. Cylinder pressures should be above 133psi (low end) and 178psi (perfect), and no two cylinders should be more than 15psi different.

If you have low compression, have a leak down test done to see if it's rings, valves, or head gasket. Go from those results.

I can't think of other oil smoke causers, but others will surely fill in the gaps.

 

[Dave1288]

i checked fer shaft play and it seams to be fine and nothing is movin around and the turbo spins, i didnt have time to take out the LICP ill get to that tomarrow night

 

[No_Skillz]

Rings. If they're going bad your cylinder walls aren't sealing and you're building lots of crankcase pressure. Time to look into a rebuild.

 

[andymoraitis]

Rings. If they're going bad your cylinder walls aren't sealing and you're building lots of crankcase pressure. Time to look into a rebuild.

Blue smoke under acceleration can certainly be rings. Forget about oil in the LICP since that's not combusted and instead run a compression test as mentioned above. If the compression test comes out OK, drop the downpipe and look for oily residue inside. Either way, a compression test should be your next step.

Let us know what you find,

Andy

 

[kenamond]

Blue smoke under acceleration can certainly be rings. Forget about oil in the LICP since that's not combusted and instead run a compression test as mentioned above. If the compression test comes out OK, drop the downpipe and look for oily residue inside. Either way, a compression test should be your next step.

Let us know what you find,

Andy

If he's blowing oil out of his compressor into the intake it can easily make it to the intake and generate pretty blue smoke. I have a question, though. If he has no excess shaft play, can he still have blown seals? If so, he could have a quart of oil in his intercooler bubbling into the intake. I did when my T25 died . If no shaft play = good seals, then I agree with the compression test (as I stated above).

 

[fastass59]

There be a chance of valve stem seal wear.

 

[oldman]

1. Turbo, check for shaft play and signs of leakage on both hot and cold side. If you find the turbo leaking with shaft play, you may have either crankcase ventilation or oil feed/return issues.

2. Piston rings, compression test both dry and wet, make sure you follow directions exactly as stated in the link.

3. Valve seals, in a severe case like this, both of your intake and exhaust valve seals are probably shot which explains smoking both under boost (oil drawn out of the exhaust seals) and vacuum (oil pull out of the intake seals), question is why are they shot.

Since all of the above are closely tied through your crankcase, do not assume that there is only one cause to your problem. Finding oil in the turbo area doesn't necessarily mean the turbo is bad nor does it mean you don't need to check 2 and 3.

 

[oldman]

3. Valve seals, in a severe case like this, both of your intake and exhaust valve seals are probably shot which explains smoking both under boost (oil drawn out of the exhaust seals) and vacuum (oil pull out of the intake seals), question is why are they shot.

Just to add, boost leak testing with the valve cover off will reveal leaky intake valve seals real fast, right Andy?

 

[Dave1288]

thanks you guys are a ton of help this had me stuck fer a week

 

[oldman]

thanks you guys are a ton of help this had me stuck fer a week

You're welcome Dave. Just one more thing, please use proper grammar, capitalization and punctuation in your future tech posts, thank you.

 

[Dave1288]

I will, I just can't get the spell check to work on my house comp.

 

[Dave1288]

Bad news the intercooler is oil free and it has to be the rings. Im going to do a compression test saterday , if can you recommend any piston/ ring combos and rods. this motor is going to be rebuilt for high boost. if you have any recommendations let me know thanks Dave