My 93 SC400 is dying, please help me diagnost the prob
 

I have a '93 SC400 with about 162,000 miles on it. and it's just running like crap. I'm scared to drive it.

When I start the car, it idles around 800 RPM, but once I put it in drive, it drops all the way to like 200 RPM... Look:

http://i112.photobucket.com/albums/n..._0373Small.jpg

Yep, thats how low this car idles when in drive. I'm so scared to drive it. I almost died out on the road because it was idling so low. When I was at a stop it was at 200, and when I pressed the gas the car tugged and it felt like it turned off but I throttled it enough for it to rev up and change gears so it kept going.

Also, I hear this weird WHINING noise coming from the engine like my car has a blower. What could this be? A belt going bad perhaps?

I know my alternator can't be going bad because I started the car up and removed one of the battery terminal and the car still ran. Should I do an oil change? Is there a way I can adjust the idle with a screwdriver in the engine?

Bump..

ClubLexus doesn't have any ideas? I've cleaned the air filter and throttle body, cleaned around the throttle. Still the same. I drove it all around fine last night but I had to ease on the throttle while at a stop so it didn't jerk down to 0 RPM and die out. Any tutorial on how to adjust the IAC so it idles higher?

check out your TPS, MAF sensor, and any and all vacuum lines. spray some carb cleaner over the engine... if it revs up you have a vacuum leak someplace....

also check the condition of the spark plugs, wires, and coil....whichever you have..could also be a failing distributor......


try searching next time....

It may likely be the TPS. Search it up or if you already know how to adjust it, turn it clockwise just a little bit.

the same thing happend with my buddies vehicle. it was the MAF sensor.

Thanks guys ill check that out..

I tried to do a little searching as well.. but for the love of god i have no idea where the TPS screw is to turn clockwise to try that first... can you help me locate it?

I sprayed carb cleaner over the engine and didn't hear anything, so scratch that. also maybe it could be my MAF so if everything isn't normal after I adjust the TPS then I'll probably get a new MAF.

https://www.clublexus.com/forums/per...-shifting.html

the thread to adjust the tps.

peace out

clean the maf before you shell out to buy a new one...or switch it out with a friend..