Mew to this site, havent read many previous posts but am needing some information ASAP. I have just have my motor built up (turbo, forged internals, minor fuel upgrades;FMU, and other small things) Anyways, got it built up, guy gave it back to me smoking a REALLY white smoke, and lots of it. Am trying to see if it's burning extremely rich and am needing some info on getting a wideband O2 sensor and if it can be placed in place of the factory 02 sensor, hooked back up to ecu for ecu reading, and then the guage too. The plugs foul out after 2 hours of idling, then hard acceleration. Am thinking too much fuel is being dumped in. Oil is not burning, compression test shows 215 all the way across. Water is staying at same level and holds pressure. Plugs are coming out black, very black, but it's not oil, not wet at all. Mainly, I am needing the info on the wideband more than anything..but any other help as well would be GREAT!

Maybe the person who put your built motor together put the head gasket on backwards. :7 If its smoking that bad pull the motor apart again to find where in the motor is leaking.

Well for starters you need to do some reading on Wideband sites. Depending on the type of wideband you are looking for, you can run a wideband and use a simulated NB output to the ECU. Only 1 or 2 people have tried to do tis and not had much luck. for some reason the simulated output does not work as well with our ECU. I know one such member was ExtremeRS and he was using the AEM UEGO system. I have the techedge but no desire to remove the factory o2.

If you would have looked into the wideband sites you would find all this info so I am not sure what you are looking for. If you use our search function you would also see that this was discussed not more than 2 days ago. Your not going to earn much respect if you dont take advantage of the search function.

That should cover your question.

If your burning rich enough to blacken the plugs....post more info.....what fuel system do you have and what fuel pressure are youi running. we can probably get in the ballpark with out the wideband. if you want to buy one then go for it...its worth it.

Now also keep in mind....white smoke is more than likely coolant even though your tests look good. get the engine good and hot then do a leakdown test. it is possible to have a crack in the block that doesnt open up until the engine is hot.

Terry

Fuel System: Walbro 255lph fuel pump, Holley FMU 12:1

Stock injectors? Take a reading on your fuel pressure make sure the pump is not over-running the regulator and the pressure is not too high.

Run the car and smell the exhaust...if its a sweet smell you have problems. if its really that white then you will smell it right away. the black plugs could be from more than just fuel. Do you have some sort of datalogger or scanner? you can get the fuel trims from a scanner quite easily to see where the ECU is at.

The bottom line is i hate to see you buy a Wideband hoping it points you in the right direction when it may not. If your burning coolant it may very well throw the reading of the wideband off.

Is it blowing white smoke when cold at idle? only when hot? only on acceleration? what kind of turo do you have? is it water and oil cooled?

give me you entire setup and we can go from there.
Terry

Well it's always smoking white, even from cold start. But it gets much worse when throttle is applied. The idle is extremely rough, the entire engine shakes, i guess that's from misfire tho... when a little throttle is applied the engine seems to smooth out a little. The turbo is super 16G from Hahn Racecraft, and it's water and oil cooled. The guy who did the work said he thought the seals were screwed in the turbo, letting water leak through and burn. I checked Hahn's site recently and I think i recall seeing that their turbos have a zero percent failure rate, which makes me think it's not the turbo. I'm not exactly sure tho.

Ok we are getting somewhere...:)

0% failure rate is nonsense. no such thing. you either have the turbine section leaking into the DP and getting burned by the cat or the compressor is leaking into your IC pipes. Start with the elbow on the turbo. remove the rubber elbow and start the car. you are looking for coolant seeping out the compressor outlet. if that all looks ok and it is still smoking at idle you may be leaking out the turbine section.

You can remove the Downpipe to check for coolant and if its leaking you should see some traces of coolant in the turbo. Remember it doesnt take much coolant to create the steam comming out the tailpipe. If the coolant/steam is causeing the o2 to read lean the ECU may be adding fuel to compensate and cause the idle to be crappy.

I have to look into how the coolant lines run the the Hahn kit but you may be able to clamp off the coolant feedline to remove the water cooling aspect of the turbo.....This is ok water cooling is not required for the turbo...oil is obviously.


At this point i dont think a wideband is your best choice till you know what you have going on.

I am on all night at work so feel free to keep this going or i can call you.
Terry

I agree with Terry on this one, if the guy said he thought the seals were bad, there was likely a reason he said it.

The hahn kit does not come with coolant lines.The turbo DOES have a spot for it though. Most guys don't use them, they just time thier turbo. I have a 14B right now and it also has the coolant lines, but I opted to not use them. I just let it cool to about 950 degrees then shut her off. Been doing that for a couple of years now with no problems to my 14B.

Ok, well I guess it's a good possibility that it is the turbo. I'm at college right now and my car is at home on a trailer, haha, so i can't try to diagnose the problem right now, but on friday i will be there and i'll have most of the weekend to look at what's going on. If you want to leave me your number or email it to me (casey.thomas@murraystate.edu) I can call you when i have a look at things and see what's going on. One thing I can't figure out is this, if i put in a new set of plugs, they foul out after a short time (1-2 hours). I could understand this happening potentially if coolant was leaking through the intake side of the turbo. But if there's a seal leak on the exhaust housing of turbine then coolant would never reach the engine. Also, I can't remember exactly, but i think the car was smoking a little right away from start.... and if coolant was leaking through the intake side ofthe turbo, wouldn't it take a little time to go through all the IC piping and the rest of the system?

It is the turbo. Your seals are gone and its burning oil and or water. It just happened to my 20g. Cost is around $350 for a complete rebuild kit from HRC.

you could try unhooking the coolant lines to the turbo and just splicing them together

no more white smoke then the
culprit is found

Well as far as your fouling plug......

the o2 senser measures the a/f mixture to help the ECU determine the correct trim level. if you have something foreign in the A/F mixture liek steam then the o2 reading may seriously be compromised. the 02 may be reading very leanwhen in fact it is not. now the ECU is going to dump fuel to try and zero out the fuel trims. your plugs become fouled because the ECU is adding so much fuel because the o2 signal is inaccurate due to other circumstances.


In that case just adding a wideband wont help you at all only cost your 45.00 for another sensor when it becomes ruined.

Terry