V6 engine idles rough after restarting, then smooths out
My 1993 Toyota two-wheel drive pickup has 163,000 miles on it. When I restart the V6 engine after shutting down for at least 15 minutes, the engine runs very rough. Reving up the engine above idle is just as rough. After driving a few miles, the engine does smooth out. When I start the engine cold, the engine is fairly smooth, and is responsive when driving. I have not seen the check engine light come on. Thank You for your help.
Re: V6 engine idles rough after restarting, then smooths...
My first guess would be a dirty carb/fuel injector set. Run some fuel cleaner through the tank and see if it gets better. You might have to do it through a couple of tanksful. How long since you've had a tune-up? It might just be that time.
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You might have a bad coil. Under a load the coil might preform well, but under no load, its weak causing a misfire...thus giving you a rough idle. I have had this problem on a few vehicle. Check plugs, wires, and distributor. Mike.
May be having problems with engine vacuum leaking. Pull the large hose going to the vacuum operated brake booster and block off the hose end with a cork or other plug. Start the engine and see if it runs more smoothly. Set the emergency brake and put in gear--does it idle smoothly? If so, then you likely have a bad vacuum leak within the booster unit. Restore the vacuum hose to the cylinder and arrange to replace the cylinder.
the trans will not allow overdrive until coolant reaches roughly 180 degrees, if the guage shows cool and the trans is not upshifting, or downshifts to third while driving. the problem is either a sticking (or missing) thermostat. follow the lower radiator hose to the engine and find the three 12mm nuts, remove these to get to it. a new toyota t-stat will have a little bleed valve on its face. position it upwards when installing. hope this is helpful.
P.S. Happy New Year