navii

hey, i dont know where to turn guys... i bought a lexus sc300 back in october and its been perfectly fine, other than a shakey engine, just recently has my car been spewing white smoke through the exhaust and shaking alot more, so i take it to the repair shop to see if it could be the spark plugs, injectors, or just the oil change, so i had them put in new ones... ive been getting 60, yes 60 miles to the tank, i cant for the like of me tell what the problem is. all i can tell you is this car rinks of gasoline.

meangreen1

iTrader: (13)

Any check engine lights? Also, what is the color of the oil, milky?

navii

thankfully nothing was wrong with the oil, one thing i think i should mention, when i first got my car, the speedometer was toping at 20, and the rpms were working fine, after a while the speedometer stayed at 0. once white smoke started spewing from the exhuast, i noticed the rpms started to stay at 0, could this be that it's the computer?

Bflatsharp

iTrader: (18)

If it smells like gas it is a good chance it is your ecu.
When i had this trouble it was my ecu. I had it rebuilt
and I have put over 6000 miles on it with no trouble.
Hope this helps and good luck.

navii

how much would a replacement ecu or ecu repair cost?

Bflatsharp

iTrader: (18)

Mine was 100.00 auto & truck electronics 866-983-6688
autoecu.com not sure but I think they charge more now.
I did this 8-10-09.

abounly

iTrader: (27)

make some SC friends and ask to swap out ECU before you might waste $100

imDementeD

iTrader: (7)

where in fl are you navii...i have a spare ecu that everything was perfectly fine except a small issue with over drive engaging..usually had to speed up and let off the gas..at least thats what i was told when i bought my car and i replaced the ecu within a week ..i personally didnt have any problems with it but..the car ran fine...if you're close to tampa i could definitely let you try it to see if the ecu is your problem.

hawkti

hopefully it's your ecu like you suspect. I know from past history, white smoke in the exhaust also can be coolant getting in your chambers. That would definately be a BAD thing. Hopefully it's not that.

navii

wow thank you imDementeD i live in miami, im going to take my car to the shop first thing tomorrow morning and see if this "japanese car care" place could find out the problem, would an ecu really impact this significantly?

imDementeD

iTrader: (7)

simple answer, yes, they can easily impact a car this much.
one of the known issues with the ecu going bad is making the car run very rich..you problem seems worse then what ive read on the forums before but can still be the culprit of a very bad ecu.

anyway good luck and report what the mechanic tells you and if you find out what it is etc.