Question about 2000 Jeep Grand Cherokee

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My 2000 4.0 idles rough when the loop closes what could be the problem

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Idle air control valve or throttle possition sensor or map sensor.

Posted on Dec 12, 2009

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I have a 1999 2.2 s10 that is idling rough. It seams to have a little less power. Once warm seams to be fine? I think it was over heated? I cannot take the radiator cap off it is a sealed system.


The generic info for a rough idle on any vehicle is to check for a leak of some kind, fuel--egr--vacuum, something of that nature. Also,Clean the throttle body and idle air system.
How long since a tune-up? Anymore 02 sensors are part of a tune-up. Any applicable trouble codes?
There are two things I can think of that could be temp related. One is going from open loop control to closed loop control, the other could be coolant temp sensor issue? Don't replace anything unless your testing points in that direction.
There could be other issues?

Nov 26, 2016 | 1999 Chevrolet S-10 Pickup

1 Answer

2000 ford focus 2.0 vin p rough idle, stays in open loop, stalls


Most probable causes are the engine coolant temperature sensor has gone bad or the manifold absolute pressure sensor is not sending the correct voltage signal. Both of these sensors let the ECM know when to go into closed loop fuel control.

Mar 04, 2015 | 2000 Ford Focus

1 Answer

00 honda passport intermittent rough idle


called misfire.
that means its not holding closed loop status at idle
ever do a tune up on it?
old spark plugs dont work, they MISFIRE and idle fails.
all cars for 100 years ,same , gas engines.

it can also be, bad fueling. or a bad engine.
we check compression first
then spark then fueling;
in that order, engine can not run right out of that order.
so misfire.
too rich misfire.
or too lean.
we check that by gazing at the spark plug tips ,
black is rich, white is lean.
most cars are cream or very light tan color. normal.
learn to read the spark plug tips.

its and 2000, and the scan tool will show the car is not i closed loop
at idle, fix that first. and DTC errors like MISFIRE P0300 or bad idle.
the same scan too show LTFT, long term fuel trim.
if its way far from 0 , the fueling is wrong.
-3-5% is normal. -50 is stuck rich and misfiring.

Jun 07, 2014 | Cars & Trucks

1 Answer

85 vette runs rough when cold , once in closed loop runs great. Need fix


Check condition of the following:

1) Spark plugs, leads and coils.
2) Air filter
3) Idle control valve.

Nov 12, 2012 | Cars & Trucks

2 Answers

92 bonneville idles rough and dies in closed loop


What's missing when it dies ? Fuel , spark ? Why even mention closed loop , that has no bearing on it . When the vehicle get's hot ,a sensor is shorting out internally causing it to die. Then when it cools down it starts again, correct ? Pull plug wires off one of the coils an turn the key to start , do you see spark ? Put a fuel pressure gauge on the vehicle an see if there is pressure . Or find yourself a guy like this
How to test GM 3 wire crank sensor hall effect type

Apr 04, 2017 | 1992 Pontiac Bonneville

2 Answers

My 2000 Grand Cherokee Laredo 4.0 has a rough idle and high oil pressure. Could an alternator cause a rough idle? I have to give it gas to get it started. Do you know why that is? There is also a...


Not caused by alternator. check the idle air control motor operation (take it off and see if it moves when the key is turned on. also clean out the air passages while you have the motor out) and clean the throttle body with carb cleaner. I have pasted some info on the EVAP purge valve--it may be operating normally. Is your engine light on? If yes, can you get a free scan at your local parts chain and send us the trouble codes?

  1. The IAC motor is located on the throttle body.
  2. Remove air duct and air resonator box at throttle body.
jturcotte_31.gif
Evaporative Emission Purge Solenoid
Description & Operation
The duty cycle EVAP canister purge solenoid (DCP) regulates the rate of vapor flow from the EVAP canister to the intake manifold. The Powertrain Control Module (PCM) operates the solenoid.
During the cold start warm-up period and the hot start time delay, the PCM does not energize the solenoid. When de-energized, no vapors are purged. The PCM de-energizes the solenoid during open loop operation.
The engine enters closed loop operation after it reaches a specified temperature and the time delay ends. During closed loop operation, the PCM cycles (energizes and de-energizes) the solenoid 5 or 10 times per second, depending upon operating conditions. The PCM varies the vapor flow rate by changing solenoid pulse width. Pulse width is the amount of time that the solenoid is energized. The PCM adjusts solenoid pulse width based on engine operating condition.

jturcotte_32.gif

Nov 03, 2010 | 2000 Jeep Grand Cherokee

1 Answer

The problem im having is when i start it it has a really rough idle and i have no throttle respnons at all if i open the throtle it will die and backfire out hte thrtle body


When you start the vehicle, the computer is in the open loop system. This means the engine is operating on preset data stored in the computer. When the car reaches a predetermined temperature, the computer switches to a closed loop system that incorporates the vehicle sensors.

Your ECM may be failing

Nov 11, 2009 | 2000 GMC Jimmy

1 Answer

ECM switches from closed loop to open loop at idle after warmup


WHEN ENGINE GOES CLOSED LOOP TO OPEN LOOP.YOU HAVE A RICH FUEL MIXTURE.YOU HAVE A VACUUM LEAK.BY YOU HAVING ROUGH IDLING.AND A HIGH MILEAGE ENGINE I WOULD DO A COMPRESSION TEST OR CYLINDER LEAK DOWN. CHECK FOR LEAKING VALVES AND LOW COMPRESSION .THEY BOTH WILL CAUSE ENGINE TO IDLE ROUGH CAUSE MISFIRE.CAUSE OPEN LOOP CONTAMINATE HO2 SENSOR CAUSE A RICH FUEL MIXTURE.

Sep 30, 2009 | 1984 Oldsmobile Delta 88

2 Answers

2000 nissan quest, service engine light on, idles rough...


sounds like it , the sensor should be on the exhaust somewhere,whith wires on it

Jan 06, 2009 | 2000 Nissan Quest

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