Assistance Needed For Novice

[zeus87gn]

At least a novice to the Lexus....I now have a problem with our 93 SC400.

It has begun the low idle and no power issue.

I did some reading on older posts here and there were some good solutions.

1 - IAC valve, mine is clean, no effect that I can determine

2 - MAF meter, a possibility but no effect if unplugged?

3 - ?????

There is also a strange reaction that is going on with this - the tachometer will drop to 0 when the pedal is depressed and the engine stumbles at the same time. I'm thinking it may have dropped an engine sensor. Cam or crank or maybe the TPS?

Anyone have any symptoms like this?

Any help is appreciated.

[zeus87gn]

In case anyone happens to stumble across this looking for possible solutions to a problem like I had, I have finally figured out what was the cause.

The lower coil that feeds the D/S cap and rotor had died.

It had a crack in it almost wide enough to put a piece of paper in.

Thanks to that, the plugs fouled and burnt.

The oil got contaminated with gas and had to be changed.

And the alternator and battery were weak and in need of replacement.

A number of hundreds of dollars later, she is up and running like a champ.

Thanks for the help!