Question about 1993 Saturn SL2

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Only two cylinders fire, could it be thepower module?

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The two coils are identical, switch them and if the other two plugs suddenly start firing, I think you have a bad coil. If the same two plugs are still dead, look to the module.

Posted on Aug 04, 2010

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I Have 1999 Oldsmobile alero Misfire on cylinder 1 can the spark plugs and wire the coil pack on1 and a new fuel filter and it still misfiring should i change the ignition coil module


That won't help. If firing good other cylinders, then the module is good. It could be an injector problem. You need to check the spark on #1. Make sure it is sparking good, then look for air/fuel mixture problem-bad injector or something else in that cylinder affecting the air/fuel mixture so it doesn't fire good. Maybe a valve not sealing- need a compression test to check that.

May 27, 2016 | 1999 Oldsmobile Alero

1 Answer

Why is it only firing on cylinders 2 and 3?


If you have replaced the coil that is not firing then you need to check the module remove the ignition coil that is not firing and you will see the two spades that fit into the coil that's were you test if it if it will run on two cylinders take a test light clip one side of test light to one spade use the tip of the test light to touch the other spade and running or even cranking over it should blink if not replace module

Apr 08, 2016 | Cars & Trucks

1 Answer

My 3800 v6 engine is running very bad as if only on 4 cylinders after degreasing it at car wash 6 hours ago .engine shudders under exceleration and vibrates .


There is a good chance that you might have gotten a coil pack or the DIS module wet and the engine is not firing on all cylinders. If the problem does not clear up when everything is completely dry, check for spark on all cylinders. One coil pack fires 2 cylinders and I bet you have one not firing.

Jul 25, 2014 | Cars & Trucks

1 Answer

No ingnition fire on cylinders 2 and 4 2004 dodge stratus 2.4 L engine


Easy! The DIS module has failed...!

The Stratus 2.4L engine uses what is called "a wasted spark" ignition system, that feeds two cylinders with the same ignition coil. Havind a pair of Cylinders dead means one of the coils or the module is inoperative. Amclaussen.

Feb 26, 2014 | 2004 Dodge Stratus

2 Answers

1997 Pontiac Sunfire 2.4 DOHC, 2 outside cylinders won't fire


One coil serves those two cylinders (no. 1 and 4), so try repllacing that coil.

Nov 10, 2012 | 1997 Pontiac Sunfire

1 Answer

Would a 2001 chryler town and country faulty engine module cause number 2 cylinder not to fire


not likely, since the engine module also fire the plug across from the #2 cylinder on the coil pack. check for spark directly at the coil, if none is found ,then most likely a bad coil pack.

Jun 11, 2012 | 2002 Chrysler Town & Country

1 Answer

1988 F150. 5.0 Have fire and Gas but will not crank. Not even with ether . have fire at distributer and fire at spark plug. checked timing its good. Replaced coil and electric module on distributer....


I would check the compression first. Without compression it won't fire. I should be at around 160psi per cylinder. If any are below or varies 10psi per cylinder, then the engine needs to be rebuilt.

Mar 18, 2011 | 1988 Ford F 150

2 Answers

Just firing on one coil but replaced it and still not working


You may need to replace the plug wires after many miles they become more resistive and deliver weak or no spark to the plugs. It could also be the ignition module it is common for GM vehicles in that year range to have failing modules.

Jan 13, 2011 | 1988 Buick Century

1 Answer

I have a 1998 Pontiac transport van 3.4 engine. The engine light is on and it is running rough. The code says my problem is the number 2 cylinder. I changed the spark plug and with inspection I can see...


cylinder 2 coil could be bad.cylinder 2 and 5 fires from the same coil pack.if coil 2 checks out good.you have a dirty injector or faulty injector to number 2 cylinder.

Jun 12, 2009 | 1999 Oldsmobile Alero

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

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