Question about 1993 Isuzu Pickup
I had an ignition problem so i went all through the system and wound up replacing the control module and the coil. after that she runs but not like she did before and when im trying to start its like the motor dosnt want to turn over
Have you checkedthe timing? If timing is off, it can cause the motor to act like that- difficult to turn. If the timing is right, a check of the engine internals could be done by removing all the spark plugs and then cranking the engine over-it should spin more freely with the plugs removed. Is your engine oil clean and not gunked up?
Posted on Nov 04, 2012
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Posted on Jan 02, 2017
SOURCE: I have changed everything: Spark
There are three components that will enrich the fuel mix: 1)engine coolant temperature sensor. If this is not working or the signal is interrupted by a wire breakage then the engine will run rich. The coolant sensor informs the ECU (high resistance) that the engine is cold at start up and so the ECU responds by increasing the fuel injection cycle to enrich the fuel air mix. Later on as the engine warms the resistance of the coolant sensor drops and the injection cycle is reduced by the ECU. If the sensor is faulty or has become disconnected (wire break or corrosion of the socket pins) the ECU assumes that the engine remains 'cold' and the engine runs permanently rich. 2) O2 sensor, operates completely independently of the EGR, if it is faulty and signals 'too much oxygen' then the ECU will significantly enrich the fuel mix to try and balance what it thinks is an excess of air. 3) Fuel pressure regulator. If the diaphragm has broken or there is a leak in the vacuum line this will result in higher than needed fuel pressure in the fuel rail at idle. The vacuum line acts against the spring pressure holding the valve closed. At idle, the inlet vacuum pulls back on the diaphragm reducing the fuel pressure required to open the valve. Low fuel pressure coupled with short duration injection times will mean a lean mix at idle. If the vacuum is compromised or the diaphragm damaged then the increase in rail pressure will make the fuel mix very rich to point of flooding the engine
Posted on Nov 02, 2010
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