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My 97 2.7 idles a little rough on very cold days. If it dies its hard to restart sometimes. After its warm it runs great. Any Ideas where to start? It has 100,000 miles probably never been tuned up. One very cold day I had to crank a very long time to get her to start, starter not the fastest in the world.

What brand of plugs work best? Probably needs that anyway.
 

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tacoma200 said:
My 97 2.7 idles a little rough on very cold days. If it dies its hard to restart sometimes. After its warm it runs great. Any Ideas where to start? It has 100,000 miles probably never been tuned up. One very cold day I had to crank a very long time to get her to start, starter not the fastest in the world.

What brand of plugs work best? Probably needs that anyway.
Most likely a dirty throttle body. I get a rough idle if I don't clean my throttle body every 30-50k miles. Get some throttle body cleaner spray, a small brass brush, Seafoam or equivilent and some BG-44.
Start by removing the intake plenum. With that removed, open the butterfly valve and spray the cleaner into the intake. Be sure to have a rag under the intake to catch the drips. After spraying it around, use your brass brush and scrub the inside of the intake, whatever you can reach. Be sure to clean both sides of the butterfly also. Wrapping a shop rag over the brush works well to pick-up lots of the gunk.
When you have everything throughly cleaned, re-install the intake plenum and fire up the engine. Burn off the cleaner until the engine runs smooth. Then pull the PCV line and prepare to slowly pour the Seafoam into the PCV. Pour about 1/2 the can of Seafoam into the PCV at a very slow pace. Once you are done, turn off the engine and re-attach the PCV. Pour the rest of the Seafoam in with the engine oil. After 5 minutes, re-start the engine and let it idle for about 5 minutes.
After all that, finish the rest of the tune-up. At some later point when you fill your gas tank, pour in the BG-44 before you fill the tank.
Be sure to change your oil some time in the next 500 miles.
 

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tacoma200 said:
My 97 2.7 idles a little rough on very cold days. If it dies its hard to restart sometimes. After its warm it runs great. Any Ideas where to start? It has 100,000 miles probably never been tuned up. One very cold day I had to crank a very long time to get her to start, starter not the fastest in the world.

What brand of plugs work best? Probably needs that anyway.
If you have 100k miles on the original plugs well that's not good. lol. Honest, go down to the dealer and get the Denso K16R-U, gap them to .031" you can also run the NGK BKR5EYA, same gap as the Denso.

I'd also grab a PCV valve, which can cause a rough idle when it stops working correctly. It's so cheap to replace.

Since you are not sure of when the last tune up was done might as well change the distributor, wires, and rotor too.

All easy stuff to do. torque the plugs down to 144 to 168 inch pounds. (12-14 ft. lbs.)

 
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