2G Just bolted on a head gasket it is running horribly.

[rustedgst]

I had a lifter tick on my 1999 GST, so I unbolted the head, and intake, and turbo. I replaced the turbo with a big 16g. with a cosmic head gasket, and new lifters. I bolted everything up then still had a ton of ticking, I assume my lifters haven't gotten oil pressure in it yet. But the Car runs absolutely horribly, I cant get going over 20mph and stumbling very bad, and a lot of times dies at idle. My AFR would refuse to run a lot of the time but when it did, it was running very lean. I unplugged my Wideband and plugged my original O2 sensor back in thinking that might help. IT did absolutely nothing. Could this be a result of Vacuum hoses not in the right places? or the new 16g needs tuning?

 

[dwb]

Are you sure you got the mechanical timing set properly when you reinstalled the head?

 

[99dsmer4g63]

I would do a leak down test. This will ensure your valves are sealing properly and that your head gasket is sealed near the combustion chamber. This will also ensure your timing is accurate as you need to be at tdc to perform half the test.

I would also do a boost leak test to check for any vacuum/boost leaks. This doesn’t mean stare at your engine bay and say yeah clamps are tight and the hoses are hooked up.

If you have no supporting mods for your 16g just routine driving will not show any issues. However at WOT depending on the psi your at yes, you may experience issues. Even if don’t see any issues at WOT I almost guarantee your still running leaner than I would want to.

I would do the BLT first and check the timing and if it passes, which I’m doubting it does, perform the leak down test to make sure everything is sealing properly.

What kind of lifters did you put in? Using an oem based lifter will probably provide oem results which is ticking lifters mainly at idling cold start.

When I tackled the lifter issues with these motors I got a set of “revised” GSC’s and picked up a Kiggly HLA regulator and haven’t heard them since under any conditions.

-Daniel

 

[chrysler kid]

Sounds like you didn't install the timing belt correctly and now the timing is off

 

[Thecarfixerguy]

If it ran good before the work was done go over the job again in your head and inspect under the hood. This happens all the time after disassembly/assembly. It’s probably something silly, but might be something that’s a lot of work. Start with checking timing. Check all electrical connections. Check for vacuum leaks at intake gaskets, injector seals, and hoses. A quick spray of brakleen on a suspected vacuum leak should cause an idle change if there’s a leak.

You said “bolted on a head gasket”. What condition were the surfaces? Did you have the cylinder head milled? If you used an MLS gasket the surfaces need to be in very good condition. Proper torque sequence and spec matter too. If you have a head gasket issue you should have other symptoms. If you constantly have air pockets appearing in the coolant and a seemingly endless stream of gases burping out if you take off the radiator cap after running it you probably have a head gasket issue.

Don’t forget the basics. What condition are your plugs and wires? Did you unknowingly damage any of them in the repair process or maybe not fully install?

Good luck. I hope you find the problem and it is just a simple fix.

 

[rustedgst]

Thanks for all the info guys, I really appreciate it. I just found out my whole motor is trash through a very bad knock and a ton of leaking oil, I don't want to deal with it, I'm going to get a junkyard 4g63, see how long that lasts . Also My 16g never got any oil when it was running due to a small kink in my feed line which I never saw, and now it is completely seized. what's the best way of saving a turbo like this?

 

[motomattx]

If its a real Mitsubishi 16G send it out to have it rebuilt, if its a knockoff 16G toss it.

 

[JusMX141]

If the turbo is worth rebuilding, I can service it...but typically a complete lack of oil on a journal bearing unit isn't promising in the sense that the oil itself *is* the bearing.