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What activate the coils inorder to get a spark at the spark plugs?

2004 GMC Envoy SLT 4.2L engine will turn over but want start there is no spark at the coil(spark plugs boots)the coils is on the spark plugs.

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  • Joe Russell Dec 08, 2016

    what is the crankshaft position sensor and camshaf sensor Job to do they send a signal to the PCM or the computer how do they work?

  • Tim Harjo
    Tim Harjo Dec 11, 2016

    Yes they communicate with the PCM. They correlate the positions of the crank and cam, or in other words engine timing.

  • Joe Russell Dec 11, 2016

    how do i check for resistance on the 2 wire crankshaft position sensor with a multimeter?

  • Joe Russell Dec 29, 2016

    do the crank and cam sensor send a signal to the PCM to fire the spark plugs which one how does the system work?

  • Tim Harjo
    Tim Harjo Jan 02, 2017

    Have you scanned vehicle for DTC'S? If so, what codes came up?

  • Joe Russell Jan 02, 2017

    these are the codes: P2101, P1516, P2119 i scannned the vehicle after i had disconnect the battry cable the battry went dead and i took it out and charge it when i disconnect the cable do that erase the codes? every time i disconnect the cable and scanned the vehicle the same codes come back, sometime the engine acts like it want to start when i release the key just a little just not getting no spark if i can get the spark back i believe it will start and run. i when cranking the RPM gauge don't move up.

  • Joe Russell Jan 02, 2017

    these are the codes: P2101, P1516, P2119 i scannned the vehicle after i had disconnect the battry cable the battry went dead and i took it out and charge it when i disconnect the cable do that erase the codes? every time i disconnect the cable and scanned the vehicle the same codes come back, sometime the engine acts like it want to start when i release the key just a little just not getting no spark if i can get the spark back i believe it will start and run, when cranking the RPM gauge don't move up.

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  • 42 Answers

The PCM, or the "computer"

Posted on Dec 08, 2016

  • Joe Russell Jan 02, 2017

    how do i test the PCM or the computer?

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1 Answer

How do i test a coil over plugs with a multimeter?


the problem is before the coils
check cam and crank position sensors for operation
check that the timing belt /chain is not broken
check immobilizer is operational
run the fault codes first

Jan 14, 2017 | Cars & Trucks

2 Answers

No spark no start why?


have you checked the timing belt for broken

Dec 28, 2016 | GMC Cars & Trucks

3 Answers

How does the crankshaft position sensor operate what is it Job to do? and how do i test the injectors for pulsa with a noid light where are the injectors located on this vehicle?


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.

Dec 11, 2016 | 2004 GMC Envoy SLT

1 Answer

I been turning the engine over a lots but i don't smell any fuel shouldn't the engine be flooded by now? there is no spark at the spark plugs.


something is stopping the fuel and spark
items that prevent those things are
broken timing belt /chain
problem cam/crank position sensors
immobilizer problem
ECM problem

Dec 10, 2016 | GMC Cars & Trucks

1 Answer

Where is the purge control solenoid and powertrain relay located on 2004 Envoy SLT 4.2L?


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 .

Dec 04, 2016 | 2004 GMC Envoy SLT

1 Answer

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?


What are the fault codes in memory for this problem, if you haven't run that test borrow an OBD2 code reader and do the test.

Dec 02, 2016 | GMC Cars & Trucks

1 Answer

Do a 2004 Envoy SLT 4.2L have a Ignition Module?


Crankshaft position sensor,cam sensor . your vehicle should have coil on plug , a coil at each spark plug !
Ignition Coils
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.

Nov 30, 2016 | 2004 GMC Envoy SLT

1 Answer

Do a 2004 GMC Envoy Slt 2.4L have a ignition module?


correction this is a 4.2L not a 2.4L
Do a 2004 GMC Envoy Slt 2.4L have a ignition module?
The engine will turn but want start no spark at the spark plugs boot what could be the cause no spark? AmanStino 3 USB ports Car charger with 1 Type port AmanStino

Nov 29, 2016 | GMC Cars & Trucks

1 Answer

The engine will crank but will not start why?


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.

Nov 22, 2016 | 2004 GMC Envoy

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