Error code 21, then misfiring and white smoke help

[Cedrock15]

BHG! (please save this for last)

Cliff:
Went 120 mph, got code 11- reset ecu, got code 21 after boosting tonight, changed bad 02 sensor wiring but car now has white smoke, rough idle and slow acceleration from start.

Story
I went 120 mph on Monday (fully test out new turbo thats been in for a few weeks) and check engine light came on after I braked. Got code 11 which is momentary interruption to ECU. I reset ECU and all was well, until tonight. Driving home I was on the highway and boosted pass a car (from 60-75 mph) then check engine light came on again. Once I got in neighborhood I noticed it felt a little weird like it was misfiring, or spark plug was dead. Pulled in driveway and checked code and got 21 which is Oxygen sensor deterioration. I saw that the wiring above thermostat was all brittle and weak so took out the bad piece and re-soldered a new piece in there. Started the car and it was a little worse. There was now a white smoke, and the misfiring/stalling sound, the heat in the car also didn't work as 85 was the same as 65. Then after this test drive after I pulled in temp gauge started to climb, checked coolant and oil and didn't see any mixing (flushed coolant 3 weeks ago when changed turbo and theres been gurgling noise since where each of the three time I burped it, it got better)

To rule out the turbo I took it for a test drive to see if it boosted, it boosted fine but there was a slight stutter when I accelerated from a dead stop. Pulled connectors off of the most accessible spark plugs (1,5,6) and those 3 are working fine. So now i'm left with a few possibities; the oxygen sensor itself must of got damaged from going 120, a spark plug died (2,3, or 4), cylinder dead,...BHG.

Please let me know what you guys think the problem is here as I have limited time to check because this is my daily driver. Thanks,

 

[Cedrock15]

checked spark plugs today number 4, 5 had a very small amount of oil on it (i think from when i took it out). Can the high speed kill the o2 sensor which would lead it to give white smoke, heat not working, and rough idle?

Anyone have an idea whats going on here

 

[rumptis]

White Smoke=Coolant burning
Blue Smoke=Oil Burning
Black Smoke=Running Rich

 

[3p141592654]

white smoke also = cold exhaust

Are you losing coolant?

No heat could be the vacuum operated valve on the firewall or other HVAC issues but is not likely related to O2 sensor

code 21 just says that the O2 sensor is not cross counting, which can be a bad O2 sensor, or other issues affecting the A/F ratio. It could also be a problem with the O2 sensor heater circuit, but your rough idle suggests that's probably not the problem.

Since you have a rough idle + code 21 I would start by checking for a vacuum leak on the intake.

 

[Cedrock15]

No coolant leaking or being lost as far as I can see and based on the ground below car being dry. I just got in from looking around for a 02 sensor where nobody had them in stock except toyota ($150...ha) so you saying I can rule out the o2 sensor because it won't cause rough idle or white smoke?

Thanks for your responses and any more input is welcomed.I'll go double check the vac. lines now, hopefully one popped off at those speeds..

 

[idoke]

White smoke looks bad. Check and see if you are leaking any coolant. leaking coolant and see no leaks, it's leaking from the Headgasket.

 

[hellraiser456]

if you want to rule out a BYHG rigyht away go get a block test and see if there is any carbon in your coolant...that is usually a dead give away...What are your mods and have you gone to a mhg and insured that your surfaces were prepped properly

A old vacuum hose popping off is a good possibility...but i think you are looking as this all wrong.

Also keep in mind its more load that will affect your engine rather than speed..so flat out at 120 is peaking your engine and its capability, meaning that if something were to give...it would show itself very quickly...especially a BHG. you would have almost immediate over heating issues and probably coolant spewing out the overflow tank.

you said you had a code 11. I know you said its not there anymore but you gotta look into why it was caused as that can be directly related to your issues. if you have a short in the harness somewhere or loose grounds...all these can cause just about any symptom. i would start to look into your electrical. more so as to why your ecu is getting its power interuppted. i would start with your grounds and obvious spots (spots exposed to high heat or near moving parts...or anything that can or has had oil on it). It could be possible that your ecu alone is on its way out.

 

[3p141592654]

A code 21 can be caused by things other than the sensor itself. The O2 sensor is one of the most needlessly replaced parts on the car, you can test it yourself easily if you have a propane torch and a voltmeter.

If I were you I would:
1) monitor coolant level and makes sure it is not disappearing. (If it does seem to be disappearing then a block test is the next step). By the way, this leak will not be on the ground, but rather into the combustion chamber and out the exhaust.

2) Check for vacuum leaks on intake. Pull off the ISC hose and plug the ISC with your hand. Engine should stall.

 

[jetjock]

Fwiw the silicates commonly found in some coolants will kill an O2 sensor if they get combusted. Same process as killing one by using non-sensor safe silicone sealent. If it's a blown BGH that may have happened.

Neat trick with the torch

 

[Cedrock15]

Thanks to everyone that had input. I just got in, fingers frozen, back aching and back of knees are done and still nothing. I think it's something to do with the turbo, maybe a seal went or something. I checked all the hoses intake side and found nothing.After engine was on for 20 minutes the coolant actually started to fill up overflow tank (was at max before) then spill out, the coolant is still green with no oil for now. Might of overflowed because I topped off radiator with alot of coolant (about 1 1'2 qt's) b/c of it steaming excessively, then idled for about 30 minutes and reved the engine for about 5 minutes on and off. During that time white smoke came from the muffler and alot from in the engine right at the back of the turbo around the turbo elbow from what I can see. If I stopped reving it would go away almost completely from the engine but when I started again it would come back and have a fun smokeout. It's too cold and rainy for me to be working on it tommorow and the weekend. So i guess I'm going to the expensive dealer (only second time in 3rd year having the car).

I had the time of my life with this car the past 2-3 weeks since I put the turbo in because it was the first time I didnt have one problem, until this.

 

[3p141592654]

Neat trick with the torch

Yeah, where did I pick that up from? :icon_bigg