Question about 1987 GMC VanDura

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Engine will not fire at all. 1987 GMC S-15, 2.8L engine

Have replaced plugs, plug wires, coil, ignition module. With the ignition in the on position, measured 12VDC at the + terminal on the ignition module, but not at the C or B terminals. I believe that the B terminal should not have 12VDC, but the C terminal should have 12VDC. Can you help. Also, the book that we are using(Helms?) says that the pickup coil in the distributor should not read infinite resistance when measured between any of the two terminals on the coil to ground, however, I do get an infinite reading. The terminal to terminal resistance of the pickup coil is within the spec given by the book.

Hope you can help.

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Good Morning,

(1987, GMC, S-15, 2.8V6,Pickup truck) The problem still exists. I think I am to the point where I have to pull the distributor out of the engine. I have never done that before, so I will be very careful.
I also decribed the problem to your Premium Assistance Service and as of now, have had no response.

Posted on Jan 13, 2009

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Posted on Jan 02, 2017

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My 95 GMC Sonoma 2.2L has fire to the coils but not to the sparkplugs i have replaced the coils and crankshaft sensor does any know what the problem could be


What do you mean, you got fire at the coils? What testing have you done? What about the plug wires?
If you can remove one coil from ignition module, use a test lite at the primary terminals where the coil plugs into ignition module, crank the engine, does the lite pulse? If nothing, have to check voltage and ground to ignition module, if that checks out, suspect the ignition module.

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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.

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What would cause no fire from the coil to the intake-side set of plugs?


The actual ignition module is the only thing that you have not replaced. That is where the problem is. You can have voltage but not ignition when there is a problem.

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I have an 2001 GMC sonoma that will not start. The engine is getting gas, fire, air, and the compression is fine. The timing mark on crank lines up. What could be the problem.


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Timing the cams and crank with a belt


  1. Note: Electronic Ignition engine timing is entirely controlled by the PCM. Electronic Ignition engine timing is NOT adjustable. Do not attempt to check base timing. You will receive false readings.

The CKP sensor is used to indicate crankshaft position and speed by sensing a missing tooth on a pulse wheel mounted to the crankshaft. The CMP sensor is used by the COP Integrated EI System to identify top dead center of compression of cylinder 1 to synchronize the firing of the individual coils.
  1. The PCM uses the CKP signal to calculate a spark target and then fires the coil pack(s) to that target shown in Figure 51. The PCM uses the CMP sensor not shown in Figure 51 on COP Integrated EI Systems to identify top dead center of compression of cylinder 1 to synchronize the firing of the individual coils.
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    The PCM acts as an electronic switch to ground in the coil primary circuit. When the switch is closed, battery positive voltage (B+) applied to the coil primary circuit builds a magnetic field around the primary coil. When the switch opens, the power is interrupted and the primary field collapses inducing the high voltage in the secondary coil windings and the spark plug is fired. A kickback voltage spike occurs when the primary field collapses. The PCM uses this voltage spike to generate an Ignition Diagnostic Monitor (IDM) signal. IDM communicates information by pulsewidth modulation in the PCM.
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2.5L V6

The ignition system consists of an ignition coil, spark plug wires and spark plugs.
The crankshaft position sensor signal is the basis for ignition timing calculations. The alternating voltage signal from the crankshaft position sensor is digitized by a pulse former within the powertrain control module. This digitized signal is then used to position the closing time of the primary circuit of the ignition coil.
Ignition timing is determined by the powertrain control module in response to engine operating conditions based on stored data tables or maps. Once ignition timing has been determined, the powertrain control module interrupts the current to the primary circuit of the ignition coil thus triggering the ignition spark which is supplied to the cylinders through the spark plug wires and spark plugs.
The ignition coils are triggered by the powertrain control module in pairs (cylinders 1 and 5, cylinders 4 and 3 and cylinders 2 and 6) sending one ignition spark to the firing cylinder and one ignition spark to the corresponding cylinder on the exhaust stroke. This ensures that any unburnt fuel residues remaining in the cylinder on the exhaust stroke are re - ignited to provide cleaner exhaust emissions.
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2.0L 4 cynder

The ignition system consists of an ignition coil, spark plug wires and spark plugs.
The crankshaft position sensor signal is the basis for ignition timing calculations. The alternating voltage signal from the crankshaft position sensor is digitized by the powertrain control module. This digitized signal is then used to position the closing time of the primary circuit of the ignition coil.
Ignition angle is determined by the powertrain control module in response to engine operating conditions. Once ignition angle has been determined, the powertrain control module interrupts the current to the primary circuit of the ignition coil thus triggering the ignition spark which is supplied to the cylinders through the spark plug wires and spark plugs.
The ignition coils are triggered by the powertrain control module in pairs (cylinders 1 and 4 and cylinders 3 and 2) sending one ignition spark to the firing cylinder and one ignition spark to the corresponding cylinder on the exhaust stroke. This make sures that any unburnt fuel residues remaining in the cylinder on the exhaust stroke are re - ignited to provide cleaner exhaust emissions.
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Integrated Electronic Ignition System The Integrated Electronic Ignition (EI) System consists of a crankshaft position (CKP) sensor, coil pack(s), connecting wiring, and PCM. The Coil On Plug (COP) Integrated EI System uses a separate coil for each spark plug and each coil is mounted directly onto the plug. The COP Integrated EI System eliminates the need for spark plug wires but does require input from the camshaft position (CMP) sensor.
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1987 GMC S-15 2.8L engine will not fire on any cylinder.


Follow this link
It shows the step by step troubleshoting of non-starting engine
Good Luck
http://www.nls.net/mp/volks/htm/eng_strt.htm

Jan 09, 2009 | 1987 GMC VanDura

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