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Have done everything i can think of replacing oxegen sensor, ignition coil and no spark to engine

Doesnt start

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  • Cars & Trucks Master
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Tried the spare key?

Posted on Jan 01, 2013

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Posted on Jan 02, 2017

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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

Wont start


is the your car engine cranking when you try to start, first check spark plugs ignition coils, remove one ignition coil and spark plug fix the spark plug in to the ignition coil then connect ignition coil to wiring and keep spark plug body touching on ground of engine head mettle parts, ask some one to crank engine then you can see is the plug sparking or not, do the same way to all the coils and plug otherwise you have to buy a ignition spark tester, is the all the coils and spark plugs are OK then check the fuel pump, it's sitting in under rear seat, before that do one thing disconnect oxygen (O2) sensor wiring and crank engine, the thing is if your oxygen sensor completely dead fuel pump will stop working, if engine start after disconnect O2 sensor, replace new O2 sensor, otherwise need to check fuel pump relay fuse and fuel pump. is this information helped you? please vote me and give a comment.

Oct 15, 2010 | 1998 BMW M3

2 Answers

No spark


Possibly the crank sensor.

Jun 02, 2009 | 1996 Chevrolet Silverado 2500

1 Answer

My 1997 Ford Explorer 5.0 V8 is not getting spark before the coil


wiring cracked and making intermittent connection.Change wiring to coil pack.

May 28, 2009 | 1988 Chevrolet Suburban

2 Answers

Fuel system 1998 Explorer


replace the fuel filter and if that doesnt help replace the fuelpressure regulator !!!
then the fuel pump!!

Apr 21, 2009 | 1999 Ford Explorer

1 Answer

Running really rough


Spark plugs, Ignition wiring, ignition coil, or high tension cord may be faulty. They must be inspected one by one and replaced if necessary.

Jul 06, 2008 | 1999 Hyundai Accent

2 Answers

2001 Hyundai Sonata


I think that the coil packs has installed wrong because you said that the problem started when you replaced them... so i think you should re-install.

Jul 02, 2008 | 2001 Hyundai Sonata

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