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Re: sc400 has lost acceleration!!!!
A simple loss of power could be contributed to several different things without knowing the exact symptoms. Throttle position sensor, a slipping transmission, faulty coil pack(s) or fuel pump can all cause power loss. Is it intermittent? constant? does the car run smoothly and just experience power loss or does it run rough? The more information provided the better I may be able to help.
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I had the same issue with my SC400, it was due to low compression in one of the cylinders, due to a leaking head gasket... I was in the process of swapping out the engine for a new 1uzfe, so it wasnt a huge problem, I had been expecting it due to the fact that I had 301,000 miles on it when I finally replaced the engine last week.
This could be a problem with plugs, wires, distributors, fuel filter or fuel injectors. Try changing the plugs and wires first, then the fuel filter. If you are changing the plugs and wires, make sue you use anti seizing compound and dielectric grease.
This should help, I did mine yesterday, it is a piece of cake... just make sure you have a good spark plug socket that fits VERY snugly on the extension,and make sure you have a LONG extension for the socket... I have a 10 inch one, and I wish I used one that was longer for the back plugs on each side... Oh, and be careful to not crack the plugs in there by over tightening them... I know that it says its for an LS400 but they both have 1UZ-FE engines so its the same thing...
And make sure to spend the extra money for the Good Plugs and Wires... I got NKG's for my '93 SC400... well worth it...
I am having the same problem with my mustang, have replaced tps, egr valve and sensor, clean maf, new plugs and wires, new fuel filter, cleaned throtle body and still having same problems....Please help!!!!!
I would suggest replacing the spark plugs, the spark plug wires, and the air filter before I would try anyhing else. Use Toyota plugs and wires. Slightly more expensive, but the extra is worth the cost.
Note that "aftermarket" plugs may make your car run WORSE.
A FixYa rating for my assistance would be greatly appreciated.