Skip the auto shop - Our mechanics make house calls

Q: I have a 1995 Isuzu rodeo .

asked by on

It has a high idle when I stop, it has a hesitation between 1800rpm and 2500rpm depending on if its hot or cold what do I need to replace?

My car has 140000 miles.
My car has an automatic transmission.

The engine hesitation could be related to the causes of the high idle or could have a separate cause such as faulty oxygen sensors or a faulty throttle position sensor. I suggest you resolve the high idle first because it is easier. In the majority of vehicles, engine idle speed is controlled by an idle control valve (ICV). A faulty or blown fuse in other electronically controlled systems can cause the IAC motor to malfunction, leading to a higher than normal engine idle speed. The ICV valve itself can malfunction due to excessive carbon buildup in the intake manifold. Other possible causes of a high idle include vacuum leaks, a malfunctioning throttle and, rarely, a PCM/ECM malfunction. With regard to vacuum leaks, on a fuel injected engine a vacuum leak will cause a high engine idle as the engine’s oxygen sensor detect the extra oxygen entering the engine through the vacuum leak. The newly lean (too much air relative to fuel) status will result in the engine’s computer pumping in additional fuel, resulting in an abnormally high idle. A malfunctioning throttle system can cause both a high idle as well as an engine stall. A dirty air intake or cracked air intake tube is often the culprit. If you desire that this high idle problem be diagnosed by a certified Mechanic, dispatched by YourMechanic right to your location, please request an engine idle speed diagnostic - high idle and the responding certified mechanic will get this taken care of for you. As noted, once the high idle is resolved, if the engine hesitation remains, that will be diagnosed in turn. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. I have a 1995 Isuzu rodeo .

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Heater not working 2005 Acura TL

Hello - you may have a bad water pump and clogged radiator. When engine overheating occurs at low engine speeds, it indicates the engine is unable to transfer heat to the radiator and cool the engine. It would also result...

Q: Not enough power when accelerator pushed.

A lack of acceleration could be caused by multiple issues. Such as failing spark plugs, failing spark plug wires, failing ignition coils, clogged fuel filter, failing fuel pump, clogged injectors, or possibly even a mechanical issue such as damaged valves...

Q: Put a new battery in. No clicking or any noise when I turn the key. What could be the problem

Be sure the battery is fully charged. If equipped, be sure the engine immobilizer system is not activated thus preventing the car from starting. If the no start issue did not exist prior to the battery replacement, I would check...

Related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.