4.3 v6 high rpm is it battery related - Sierra GMC Cars & Trucks

The ideal idle RPM (revolutions per minute) for a 1990 Plymouth Acclaim V6 LX with an automatic transmission can vary slightly depending on factors like engine condition and specific adjustments. However, a common range for idle RPM is around 600 to 800 RPM when the car is in gear and stopped. It's always best to consult the vehicle's manual or reach out to a qualified mechanic for precise information tailored to your car's specifications.

You can get a free scan from Autozone, Oreilys, or Advance auto parts. This should indicate a problem. If the standard test scanner does not verify a problem, the Dealers have more advanced scanners which can capture intermittent problems.

There are so many possibilities that you need more tests to find the problem. Offhand, if this is a V6 engine, there were problems with intake Manifold runners and sandwich gaskets for 2 piece intake manifolds.

Stuck manifold runners could provide lousy low rpm performance and perfect high rpm performance just like you describe whether a V6 or V8. The 2 piece intakes were used on V6 engines and once you get above midrange in Rpm, it could run acceptably at higher Rpm.

After you reinstall the air cleaner, you may need to take the vehicle to a Toyota dealer to have the ECM computer reset. In some cases, disconnecting the battery doesn't do the trick.

Check the idle air control motor. And the throttle plate it may need cleaning

If you need further help, I’m available over the phone at https://www.6ya.com/expert/edward_020b3320326d263d

1st run scans for fault codes.

that is a possibility. is this a guarantee to fix? if he has done the proper diagnostics and he is guarantee the repair then this would be logical. but no fix no pay. dont let it turn into something else and something else. hope this helps

check idle speed sensor on your intake manifold around 700 to 750 rpm is normal ,air temp may efect idle speed .

Your ivs is carboned up an needs replace it stuck open

it could be the sensor you should look at the oil pressure relief valve

what is thye correct idle rpm in park 1999 amigo