Question about 2004 GMC Envoy
The engine will turn over but want start no spark sometime when cranking after i turn the key loose the starter will keep turning for a few seconds.
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Posted on Jan 02, 2017
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Jan 23, 2017 | Cars & Trucks
Nov 17, 2016 | 1997 Buick LeSabre
Sep 12, 2015 | Jeep Cars & Trucks
Are the plugs installed because without compression you will not get ignition/spark.
Are there any codes set???
Is the ignition fuse okay??? Is ECM fuse okay?
Of course first you need power to the coil which should be there whenever the ignition and run switches are on if so see below:
Are the plugs installed
Remove the coil. THEN set your ohmmeter scale to RX1 and place ohmmeter leads on the primary coil windings A (front of coil) to B (middle of coil), B to C (front of coil) and check for primary coil winding resistance which normal resistance range is 0.5-0.7 ohms. If primary resistance is not within this range check out test results below.
Ignition Coil Secondary Circuit Test
With the ignition coil removed from the motorcycle and the ohmmeter set to the RX1K scale place the ohmmeter leads on the secondary coil windings B (middle terminal) to
R (rear secondary terminal/socket), B to F (front secondary terminal/socket) and check for secondary coil winding resistance which normal resistance range will be 5.5-7.5K ohms. If secondary resistance is not within this range check out test results below.
A low resistance value indicates a short in the coil winding which requires coil replacement.
A high resistance value might indicate that there is some corrosion/oxidation of the coil terminals requiring the coil terminals to be cleaned and the resistance test then repeated and if after the test is repeated the resistance is still high after the terminals were cleaned the coil must be replaced.
If there is an infinite ohms or no continuity) resistance value the coil is open and must be replaced.
If you have spark, it sounds like either the sensor in the timing cavity of the engine is bad or the electronic ignition unit is bad.
Oct 18, 2014 | Cars & Trucks
Fig. Fig. 1: Engine ignition coil harness connections-3.0L and 4.0L engines
Fig. Fig. 3: CKP sensor wire harness connections for the 4.0L (VIN X and E) engines
If there is power and both the coils and sensor check good, replace the ignition control module.
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