kross500

well, I checked the intake pipe one more time for cracks, did not find any. It could possibly be the mass air flow sensor. but, it's not an issue anymore. Was driving the car the other day, lost oil pressure, drove it for about 1/2 mile to get it off the highway, and drained the oil when I got it towed home and found very very small metal particles in the oil. My dad thinks that the engine is toast, hes pretty knowledgeable about this. The car still starts up fine, a little smoke at the start up for about 10 sec. and there is a small knock coming from the engine compartment. I'm about to start tearing down the car and parting it out on eBAY. if anyone thinks that I should hold off for a while, maybe something that I could try, let me know. Oh, by the way- I lost oil pressure about 5 miles after I had the engine up to around 5000 rpm. thanks for all the great info guys. keep in touch.

Thanks lex3486, i've checked the intake hose. I'm assuming that the sensor that you were refering to is the one directly after the air filter. I did check that hose, and i didn't seem to see any cracks. I completely removed it and checked the underside, too. When i start on a hill, it will completely lose power when i stomp it hard, and won't regain power unless i ease off the gas. I haven't tried it in reverse though. A friend of mine suggested a speed sensor. Any idea on how often those go bad??? and if this would cause the problems i've been having? Or is it more likely that there is a small crack in the intake hose which i just can't see? appreciate all the great ideas you guys have been throwin out there. I'm sure that with just a little work i'll be able to pinpoint the problem.

Ok, heres the problem guys. 1993 es300. 180k miles. Under hard accelleration from a complete stop, I get a total loss of power. Engine idles fine, does not overheat. Looked at spark plugs, and they appeared to be in good condition, but I can't be positive. They were replaced recently. If the car is in neutral, and I hit the gas hard, the engine runs fine, gets up to high rpms very quickly, with no loss of power. Recently had the complete fuel system cleaned, where they dump the chemicals into the gas tank and i believe the throttle body. Still no fix. Stumped...any suggestions would be great. It seems like there is a lot of knowledge floating around this forum. Problem has persisted for a long time, maybe 50k miles or so. but it has gotten to the point where now, if I am crusing around 65 or 70, and stomp on the gas hard to pass on the highway, I am experiencing a slight loss of power or hesitation, which I never experienced before. It sounds like a ignition problem for the engine is not getting enough fuel or air...but i cannot be sure and lexus maintainence can be pricey. thanks for the help guys.