i need some help.

[highimeric]

i have a 1995 240sx with a redtop sr20 it has a t25 turbo, intercooler and 3" exhaust. ive driven it about 2000 miles sense i bought it but now its smoking white out the tailpipe. i did my searching and i was thinking it was a headgasket but the oil doesnt smell like gas or coolant and its not murky. also the coolant is norml. im not sure what the problem is. it smokes alot sometimes alot not alot other times. also, i have a narrowband A/F gauge and it jumps all over the place sometimes and reads normal sometimes. im not sure if the problem could be that im running lean because the sensor is messed up?

and if your going to be an a hole and tell me something mean idc dont tell me.

thanks

[idahotuner]

narrow band A/F gauges do that i am told... i was going to say headgasket but now i dont know. still could be.

[highimeric]

ya i heard the narrow band gauges cant tell you too much.

[ILikeMy240sx]

does it blow out smoke when you are standing still or rolling to a stop?

During part load operation, your ECU uses the narrowband O2 sensor to stay close to stoich ratio... that's why you will see it dance back and forth.

During WOT, heavy load operation, your ECU will take the O2 sensor out of the loop and run a closed-loop control to purposely run your car run rich.

In anycase, if its smoking while you are stopped or slowing down, its possible that your turbo is blown out. T25s tend to go band esp with people pushing the boost.

[highimeric]

it blows smoke all the time its just a matter of how much. but it hasnt been donig it real long it just started yeaterday. it used to do it every so often at start up only tho

[IanS]

what does the smoke smell like, if it is slightly sweet, then it is most likely coolant, but if its acrid and burnt smelling it is more likely your turbo seals.

[highimeric]

mm i thik its more like a burnt smell. im not 100% sure tho....

[IanS]

Do you notice the smoke more at idle than while driving? Is the color pure white, or is it more greyish?

[highimeric]

ya it does smoke more idling. it was its more of a bluish white. and i think it smells more "sweet" actually.

[adrianfromthecastle]

hows your idle like?

I kinda had the same symptoms; smoking like crazy at idle and while going, it also backfired like crazy. I found out it was my mafs.

[highimeric]

ehh its never liked idling. i have to baby it down to idle after i drive for a while. my car hasnt backfired ever. but i did just clean my maf maybe i f'ed something up.

[adrianfromthecastle]

ehh its never liked idling. i have to baby it down to idle after i drive for a while. my car hasnt backfired ever. but i did just clean my maf maybe i f'ed something up.

what you could do is while your car is stopped and at idle (and still smoking), pop your hood and unplug your mafs, and see if the idle corrects itself and the smoking stops. if it does, then you know its your mafs.

[highimeric]

i unplugged my maf and my car just died...

[IanS]

Do you have any overheating issues, and have you noticed any coolant loss?

If no then it is most likely oil burning, lost likely causes would be worn turbo seals, or worn valve seals.

[highimeric]

ya theres no overheating or loss of coolant. how do you suppose i go about fixing this? thanks for all the help too!

[adrianfromthecastle]

i unplugged my maf and my car just died...

really? haha... dam that sucks... my car doesn't do that

[deuce_40]

sounds like a blown turbo seal

[Hijacker]

I'm agreeing with the turbo idea. Best thing to do is to pull the intake piping and see if the turbo's compressor wheel has any play in it and to check for excessive blowby.

[highimeric]

ok thank you. should i get new turbo gaskets?

[Mistaken]

You will either have to rebuild it... or replace it. I suggest replace it, either upgrade or just find a better condition t25. I got my second one for 25 bucks and a case of beer , but usually they are more expensive. If you need a t25 desperatly im pretty shure ive a decent one sitting around, its got some shaft play but the seals are still good, i dont want much for it, just need to get some of these parts out of my garage.

[IanS]

Just rebuild the one you have, all said and done it will cost about $120 and then you have the piece of mind that your turbo is essentially brand new.

[highimeric]

hmm this might be an opportunity to upgrade... haha

[idahotuner]

yeai havea t25 with ZERO shaft play, that i need to get rid of to make some money, if yo uare are interested hit me up.

[Mistaken]

Anyone know where i could pick up rebuild kits for my t25's i have sitting around? It would be nice to get them fixed up and either sold or kept around for spares.