How do i check the trigger side of the ignition coil?
what is all the things that will cause no spark at spark plugs boot?
2004 GMC Envoy SLT 4.2L the engine will turn but want start there is 11.9 voltage at the positive terminal on the coil when the ignition key is on now i need to check the trigger side of the coil can you send me pictures showing how to do it? i need this GMC to start just not getting any spark at the spark plugs i test the crankshaft position sensor it seem to be good can any body help me?
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The crank sensor is needed for the coils to fire. It is on the drivers side, mounted in the engine block back by the transmission. The injectors are under the plenum. The plenum wraps around them. I wouldn't worry about them right now. And your probably right about being flooded. I would throw new plugs in it when you replace the sensor.
Powertrain relay ? Maybe you mean IGN 1 relay ? This supplys B+ power to the coils . relay # 58 in the under hood fuse box .
Is there B+ voltage at the coil's pink wire ?
Evaporative Emission (EVAP) Canister Purge Solenoid (LL8)
On the left side of the engine block
Engine Controls Component Views in Engine Controls - 4.2L
Engine Controls Connector End Views in Engine Controls - 4.2L
Evaporative Emission (EVAP) Canister Purge Solenoid (LM4)
On top of the engine, toward the front
Google picture of solenoid so you know what your looking for .
Crankshaft position sensor,cam sensor . your vehicle should have coil on plug , a coil at each spark plug !
Each ignition coil has an ignition 1 feed and a ground. The PCM supplies an ignition control (IC) circuit. Each ignition coil contains a solid state driver module as its primary element. The powertrain control module (PCM) signals the coil driver to initiate a firing event by applying a signal to the IC circuit at the appropriate time. When the signal is removed, the coil fires the spark plug. The spark plugs are tipped with platinum for long wear and higher efficiency.
During normal operation the powertrain control module (PCM) controls all ignition functions. If either the crankshaft position (CKP) or camshaft position (CMP) sensor signal is lost, the engine will continue to run because the PCM will default to a limp home mode using the remaining sensor input. As mentioned above, each coil is internally protected against damage from excessive voltage. If one or more coils were to fail in this manner, a misfiring condition would result. Diagnostic trouble codes are available to accurately diagnose the ignition system with a scan tool.
If a crank sensor is replaced a Crankshaft Position System Variation Learn must be done and a scan tool is need to do this.
Do you have any codes or an engine light on, in your dash board ? Have you checked for spark at your plugs ? There are many things that could cause a vehicle to not start. Bad camshaft/crankshaft sensors. Poor ground wiring. Defective spark plugs or wires/coils.
The spark plugs are under the coils. To get to them you must remove the plastic cowling from the top of the engine. Then you will see the coils, there will be six coils, one for each cylinder each looks the same with an aluminum heat sink on the top. These are removed by removing and the retaining the screw and wires.
Once removed the spark plugs can be access but before you remove the spark plugs make sure the spark plug well is clear of foreign material. Dirt or debris in the spark plug well can fall into the engine and cause damage.