smoke in 3rd....alot

[Shimy87]

Been tuning car. It has had a chug/surge in third gear starting about 75ish. Thought maybe fuel pump was getting weak as I was also getting a bit of knock in third also ( .7 to 1.2) it varied but my O2's were 790ish so I was checking fuel pressure and at 23 lbs of boost I was putting 70 lbs of fuel pressure to her so that wasnt it. Happened to look in mirror during a run and had a cloud of smoke behind me. Made another pass and 1st and 2nd no smoke, in 3rd it does the chug/surge/hesitation thing and the smoke starts coming on. Checked the up pipe and its bone dry so its not pushing oil out the turbo. I have breathers on both valve covers. I did notice that it is also spitting out a little oil thru the dip stick tube.
.

[Steve Wood]

what did you say the compression is?

[Shimy87]

Solved the smoke show. The vacuum line that went into the solinoid that then goes to the egr blew out of the end. I stick a pin thru the rubber coupler that the hose pushes into and made a few passes....no smoke.  As soon as it cools down ill be doing a comp test, its back to only pushing  20 lbs of boost. What should I have for compression? If compression checks out im going to pull the headers and check for cracks or signs of leaks at the block. Did a smoke test before and didnt see any but something is causing my lack of boost?

[Steve Wood]

Not sure what that has to do with smoke, but...TT chip does not use the egr so you can remove that solenoid and the vacuum lines associated with it.

Compression should be about 145-150 psi.  Be sure to hold the throttle wide open when checking.  I usually unplug the cam sensor to prevent the engine from running or activating the injectors while testing.

[Steve Wood]

Test the check valves on the rest of the stuff

[Shimy87]

Comp test dont know cylinder numbers so starting by the turbo and going clockwise 162 162 162 150 162 160. The back cylinder by the driverside firewall is the low one. Is that too far out? I know on a sled 10 lbs is the most you should vary before a rebuild but I dont know about cars??

Of course one of the plug wire ends broke off while doing this......I think the car hates me

[Steve Wood]

Close enuf,  I think

1 3 5 from front on drivers side, 2 4 6 passenger

[Shimy87]

So no rebuild yet? How far apart is to much with these? I did find a bad check valve, the one going to the charcol canister. I also elininated the vacuum to the egr control.

[Steve Wood]

May be a bad valve leaking pressure out of the cylinder. As the others are close,  I don't think it's a big problem yet. I was wondering why it was blowing oil.  Thought you might find 120psi.  Thought that might explain the low boost, too.

Somewhere between 10% and 10 psi,  I guess. 10% variation between cylinders.

I still don't understand why it smoked

[Shimy87]

Could a bad valve, under 20lbs of boost, push oil in thru the valve. The motor has had a "tick" ever since I got the car, maybe its a valve I hear? This winter could I get the drivers side head off while motor Is in the car?  Or does the motor need to come out for that?


Tommorow night im going to pull the headers and check for leaks/ cracks. Gotta solve this lack of boost.

Thanks!!

[Steve Wood]

boost would push oil out of the cylinder, not suck it in.  No problems pulling the heads with the engine in the car

[Shimy87]

Been to 4 auto parts stores to get a replacement check valve. The one that is going to the charcol canister, so where can you get one. I cant even order one thru a parts store. What if I dont have a check valve in that line??

[Steve Wood]

Help section should have them. Used on many cars. Boost blows into the cannisyer

[Steve Wood]

And back to the tank... Not sure if the solenoid on the cannister stops it,  or not

[Shimy87]

Could that bad valve be causing my lack of boost?