xwilliams

Hello gents. I just got a 92 LS400 from a friend recently. It had about a 1/4 tank of gas so i decided to run that out before I put i put new fuel inside. When the time came to refuel, i used premium and added a bottle of gas treatment. As soon as i pull off the car dies. After a few tries it cranks and enters "limp mode". So far I replaced the fuel filtet only. Wanted advice before I started throwing money at it. Also Im leaning towards it being a MAF problem because thats the code that came back and I unplugged it a little while ago and it started running a bit smoother but still no power really when I push the gas. Any help would be appreciated.

sha4000

iTrader: (1)

Why don't you trying cleaning the MAF and unhooking the battery for a about 30 minutes. Then put everything back together and see how it runs.

cobalt91

From what I have read you dont want to clean MAF sensor on pre 95 ls400. These older models use a different kind of sensor that is really sensitive to cleaners.

xwilliams

What about soaking it in alcohol.and let it dry for awhile

PureDrifter

iTrader: (10)

no. it uses plastic in it that is sensitive to most all solvents.

sounds like the gas treatment may have been the cause. what did you use? I would try to get some fresh gas in it.

xwilliams

I drained all the old gas because i thought the same thing. (A full damn tank. Smh) and put in about a quarter tank of fresh gas and still the same thing.

bgalarpe

What about replacing the spark plugs...maybe it got fouled by the old gas and the treatment.

xwilliams

Im going to change the plugs, but what about canned air on the maf?

sha4000

iTrader: (1)

I apologize for recommending to clean the MAF which is actually an AFM ( Air Flow Meter ) of the Karman Vortex kind which can't be cleaned. All you can try to do is spray some compressed air in there and hope it fixes it. I would look for a known good one on Ebay or somewhere else if it is in fact that part that is having issues. Maybe a junkyard.

xwilliams

I took the cover off to change spark plugs and notice part of the timing belt is frayed. So im going to sit it up until i get someone to change it. Thank you for your help gents.