Question about 1990 Plymouth Voyager

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No fire to plugs. Replace both crankshaft & cam sensors, and the coil. Still no fire to plugs.

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Check distributor cap & rotor -coil sparkplug wire . it's probally the pick-up in distributor .

Posted on Nov 05, 2010

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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.

Nov 30, 2016 | 2004 GMC Envoy SLT

2 Answers

97 oldsmobile achieva wont fire changed coil pack spark plugs cam sensor still wont start


Make sure battery has a full charge and battery connections all good.
If it cranks good but won't start, have a helper crank it while you visually check for spark at the spark plugs. If spark everywhere, use a gage and check proper fuel pressure and fuel injector pulse.
If you having a problem with more than one system, I want to check for rpm signal, that usually comes from the crank sensor. Not sure why you replaced cam sensor? I always want to check sensor wiring circuits before replacing anything. Don't replace anything unless your testing points in that direction.

Nov 04, 2016 | Oldsmobile Cars & Trucks

1 Answer

No fire to the spark plugs


When you are not getting spark to your plugs, there are only a couple of things that could cause it. It can either be the coil, coil wire, cam sensor, crankshaft sensor, O2 sensor, or the PCM. I would recommend that you have a diagnostic ran as it will save you time and money.

Apr 24, 2011 | 1996 Chevrolet Suburban

1 Answer

I have a 1996 dodge caravan (3.3L) that won,t start.I had diagnostic test done and it showed a bad crankshaft sensor.I replaced it and it still did'nt start so i went ahead and replaced the cam sensor and...


Typically, the on board computer monitors the crankshaft for rotation and the cam shaft for rotation, and fires the spark plug accordingly. There may also be a sensor for top dead center for cylinder number one. If you have a broken, or slipped timing belt/chain, the rotation sensors will be out of sync and the computer won't let the spark plugs fire. You could also have a failed ignition coil for a failed trigger circuit for you coil. If the diagnostics are not calling out a specific trouble code, check your timing/belt.
Note that I am not an expert on this particular vehicle, but have spent a fair amount of time working on newer computerized vehicles.

Jan 17, 2011 | Dodge Caravan Cars & Trucks

1 Answer

2000 caravan. engine will no start. replaced the cam pos sensor, no fix. I don't seem to be getting fire to the coil pack. any tips on testing or repairing?


does it have a crankshaft sensor? My experience is cam position adjusts timing, crankshaft sensor allows ignition.

Apr 30, 2010 | 2000 Dodge Caravan

2 Answers

96 intrepid not fireing have tried resetting the timeing no codes were found new coil pack all connections r good what do i do next


i got a1996 dodge intrepid 3.5 L .the spark plugs 1,3,2 works but 4,5,6 do not work. i changed the spark plug wires, the coil ,the crankshaft sencer and the camshaft sencer.what else could cause this not to start?

Jan 19, 2010 | 1996 Dodge Intrepid

1 Answer

I have a 1994volvo 850 turbo. This car Mostly Doesent Start. The Coil Is Not Fireing. Upon Checking Their is no Triggering Signal at the Igniter.The car Must Have a Crankshaft Signal as when cranking the...


check or replace the cam sensor, this sensor sense the turning of the cranksaft by sending info to ECU telling ecu to tell the coil to disperse the sparks. is the cam sensor is faulty than you will not get any fire/sparks from the coil assuming the coil, wires and plugs are good. crank sensor does the same but turn on the fuel pump. hope that help some

Oct 03, 2009 | 1994 Volvo 850

1 Answer

No spark


Crankshaft sensors are normally mounted on the block at the front crankshaft pully.

May 23, 2009 | 1997 Dodge Neon

1 Answer

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.
  1. The coils and coil packs receive their signal from the PCM to fire at a calculated spark target. Each coil within the pack fires two spark plugs at the same time. The plugs are paired so that as one fires during the compression stroke the other fires during the exhaust stroke. The next time the coil is fired the situation is reversed. The COP system fires only one spark plug per coil and only on the compression stroke.

    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.
  1. The PCM processes the CKP signal and uses it to drive the tachometer as the Clean Tach Out (CTO) signal.

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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Apr 05, 2009 | 1998 Ford Contour

2 Answers

I cant get spark out of the coil pack


cam sensor fires the injectors to synchronise injector pulsing with the spark at the spark plugs.. U need to probably change the crankshaft sensor (around the crank pulley) as the crank sensor is what controls the ignition spark.
hope that does it.
:)

Jan 20, 2009 | 1996 Plymouth Voyager

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