I purchased a 97 2.7 Tacoma with 118,000 miles on it about 3 weeks ago which had a rough but not terrible idle. I did a basic tune up (oil change, air filter, spark plugs, cleaned Maf) and also ran sea foam through the PCV and ran a can through my fuel system and noticed the truck running a little better. I then got a CE light and followed the code advice and replaced both 02 sensors (neither had ever been replaced), light went away and the truck ran much better. The truck still has a slightly rough idle (750,000 rpm's) and Im wondering what I can do to get this thing purring at idle?

all thoughts and suggestions greatly appreciated.

 

Turn up the idle screw

 

if i turn it up im just increasing the rpm's. isnt 750,000 rpm's correct at idle?

 

Sure but if you bump it up a lil so it runs smoother you won't hurt anything. I'm not sayin crank it to 1k

 

What do you mean by "rough" idle? It's high or is it sputtering? BTW, it's just 750 rpm not 750,000.

 

The truck shakes a little and the exhaust is rattling. it did tone down after replacing the bad 02 sensor but its still a little rough. Could my valves need ajustment?

 

You would her a tapping from the head. Try what I told you then get back to us

 

I actually noticedtoday on my way to work that it is idiling just below 750. where is the idle ajustment screw located? im assuming somewhere near or on the intake?

 

Right next to the throttle body. Should be a flathead screw on top

 

700-750 rpm is high enough to not shake the truck, it's actually right on the $$. You may have a slight miss or a sensor like the TPS or coolant temp sensor is going bad. You can try turning up the idle screw a little, but you may want to test the resistance/voltage on some of your sensors too. My gut says the IAC and throttle body need to be cleaned, and that's free and good to do anyways.