93' Geo metro won't idle down immediately when accelerator is released Seems to idle up and down before settling into a high idle Just swapped in a used 94'motor and this didn't happen initially.?

Answer 1

try changing out the pcm, when changing from one year to next you need to use the same pcm Answeri cant give you much info on that exact prob.but...i can tell you start looking in the direction of vaccum lines,if that fails look at map,tps sen....good luck

I have a 99 metro with a 3 Cyl. & 5 spd. It had idle problems and the MPG hovered as low as 30.

I knew the rear O2 sensor was bad so I replaced it.

No change.

I inadvertently damages the front O2 sensor harness (I'm a klutz) and replaced it.

No change.

New air filter, cap and rotor (plugs and wires were still pretty young).

No change.

Started reading the shop manual.

Remember that little thing called the PCV Valve?

Pulled it out to find that it flowed air in both directions. It should only flow air in one direction because it is a check valve.

I replaced it for less than $3.00.

The idle immediately went normal and after two tanks of gas (the computer had to re-learn everything) I am getting well over 40MPG with 50/50 highway/country and I am a bit of a lead foot.

This may not help you with the '93 but this is good info for somebody I'm sure.