1996 dodge neon a/t.when cold(morning) at idle the engine rpm will swing up-down(1500-2000)untill engine hot it will fine.Is it over chrage or not at 2000rpm in noon time.the volt is14.5-15v and it will make the proplem to ECU or not.Thank U . Paul
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the 4.0L engine?
is this engine cold or hot.
why is 2000 rpm wrong for 60mph., (depends on engine and axle size and what gear you were in , then)
the idle speed for hot is too high
did you scan the PCM yet?
if hot , idle is high, is the thermostat holding water temp 180f or above. ? if not that is the problem.
Look for the oil pressure sending unit on the block or the cylinder head on the V-6 or V-8 models.
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OIL PRESSURE TEST
Check for proper oil pressure at the sending unit passage with an externally mounted mechanical oil pressure gauge (as opposed to relying on a factory installed dash-mounted gauge). A tachometer may also be needed, as some specifications may require running the engine at a specific rpm.
With the engine cold, locate and remove the oil pressure sending unit.
Following the manufacturer's instructions, connect a mechanical oil pressure gauge and, if necessary, a tachometer to the engine.
Start the engine and allow it to idle.
Check the oil pressure reading when cold and record the number. You may need to run the engine at a specified rpm, so check the specifications.
Run the engine until normal operating temperature is reached (upper radiator hose will feel warm).
Check the oil pressure reading again with the engine hot and record the number. Turn the engine OFF.
Compare your hot oil pressure reading to specification. If the reading is low, check the cold pressure reading against the chart. If the cold pressure is well above the specification, and the hot reading was lower than the specification, you may have the wrong viscosity oil in the engine. Change the oil, making sure to use the proper grade and quantity, then repeat the test.
Low oil pressure readings could be attributed to internal component wear, pump related problems, a low oil level, or oil viscosity that is too low. High oil pressure readings could be caused by an overfilled crankcase, too high of an oil viscosity or a faulty pressure relief valve.
your problem may be a bad iac ( idle air control ) valve. also check or clean egr valve passage way to engine. or the egr itself is stuck open. ( exhaust gas recirculation ) valve.
If you recently replaced the battery, you may need to reset the idle air control valve setting. This is done by removing the NEGATIVE battery wire from the battery while the vehicle is HOT. Then you must wait several hours for the vehicle engine to become cold. Next, once could, reconnect the negative cable. Start the vehicle, place your foot on the brake and imediately put the vehicle in drive. Stay in that situation until the vehicle engine bcomes hot to normal temperature range. This will be known by hearing the radiator cooling fan turning on. You must NOT use the airconditioner during this cause it will be on during the event. Once accomlplished place in park and allow the engine to cool, engine off. This resets the engine computer to tell the idle/load speed control valve to add air and resuling in additional fuel to the engine under various torque loads.
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