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When engin hot,idle loops and when i apply acceleratorengin very rough.

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Check for engine vacuum leak including air intake and filter assembly.Also fuel pressure.not enough info to narrow it down with

Posted on Oct 10, 2008

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1994 thunderbird lx rough cold starts warmed up runs fine alot of parts replaced new plugs and wires


You may have dirty fuel injectors - once the engine warms up and goes to closed-loop operation, the computer can compensate for clogged injectors to some extent. Another possibility is sticky valve lifters that work better once the oil gets hot - if this is the case you may hear a rhythmic tapping noise in the valve train at idle while the engine is cold.

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My 2005 suzuki vitara idles up and down when a/c is on


this is normal. it has been so for 50+ years. if you watch under the hood, you will note that this occurs as the compressor cycles on and off. more load on engine requires more fuel, live with it.

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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.
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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.

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Nov 03, 2010 | 2000 Jeep Grand Cherokee

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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.

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Idles okay, runs rough when gas applied


Either a bad MAP sensor, or TPS. What is the code for the check engine light? This will most likely tell you what it is.

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Rough idle / engine surges until power is applied


Sounds like a possible vaccume hose leak?

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