Question about GMC Jimmy

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No spark on my 1995 S15 Jimmy, replaced coil, pick-up coil, module still no spark. 4.3 Vortec. Will crankshaft position sensor help?

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  • Jeffrey Turcotte
    Jeffrey Turcotte Mar 27, 2011

    Hi, first verify you have 12 volts to the coil positive terminal before buying a new crank sensor.

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  • GMC Master
  • 2,428 Answers

Let me get this stright you have replaced the coil and the electronic ignition the thing on the coil with the cooling fins on it. And you still have no spark CORRECT . I need to look at may manuals im vary formilar with this engine and i will get back to you in a little while . A nd if you can tell me anything eles it would be helpful about how this problem started so one fine day you went to start it up and What happened give more and then i can give you more

Posted on Mar 27, 2011

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How many camshaft sensors on a 1999 olds aurora


The Ignition Control System consists of the following components:
?€¢
Two crankshaft position sensors (A and B).


?€¢
Crankshaft reluctor ring.


?€¢
Camshaft position sensor.


?€¢
Ignition control module.


?€¢
4 separate ignition coils.


?€¢
Eight spark plug wires and conduit.


?€¢
Eight spark plugs.


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Knock sensor.


?€¢
Powertrain Control Module (PCM). Camshaft Position (CMP) Sensor
Right hand rear of the engine, near the power steering pump

Oct 01, 2015 | Cars & Trucks

1 Answer

How do replace ignition control module in 1998 K-1500 5.0 liter vortec


This system does not use the ignition module used on the DI systems in the past. The VCM controller now controls the ignition control (IC) and bypass functions.
The crankshaft sensor, located in the front engine cover, is perpendicular to a target wheel attached to the crankshaft. The target wheel is equipped with slots situated 60 degrees apart. As the crankshaft rotates, the target wheel rotates past the crankshaft position sensor. The rising and falling edges created by the slots cause a signal to be sent back to the VCM. This signal occurs three times per crankshaft revolution and is referred to as the 3x signal for V6 applications. The signal occurs four times per crankshaft revolution and is referred to as the 4x signal for V8 applications.
The VCM then utilizes this 3x (V6) or 4x (V8) signal in order to provide the correct spark to the engine by way of the single coil driver module. The single coil driver module is basically an electronic switch that when commanded by the VCM, causes the primary coil voltage to breakdown, energizing the secondary coil and providing a spark via the coil wire to the distributor cap. The distributor consists of the following components:
The system consists of the following components:
?€¢
Vehicle control module (VCM)


?€¢
Distributor


?€¢
Ignition coil driver module


?€¢
Ignition coil


?€¢
Crankshaft position (CKP) sensor


Now which part do you want to replace ?

?€¢
Cap and rotor


?€¢
Camshaft position sensor


?€¢
Gear drive and shaft

The camshaft drives the distributor shaft which rotates providing a spark to the correct cylinder by way of the cap and rotor. The camshaft position (CMP) sensor functions much like the crankshaft sensor previously described but provides only a 1x signal to the VCM. That is, for every 2 rotations of the crankshaft, there is 1 rotation of the camshaft. Note that the camshaft position sensor will not affect driveability. The sole purpose of the camshaft position sensor is to provide the VCM with the necessary information for the misfire diagnostic trouble codes (DTCs).

Sep 06, 2015 | 1998 Chevrolet K1500

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I've replaced everything to do with ignition spark on ky 1998 gmc pickup it has a 350 vortech engine why am I jot getting spark at the spark plugs ?


There is a spark control modal in the distributor most books do not tell you about it . if you have replaced everything else try that

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My 1995 dodge caravan trys to start but wont im getting no spark to my spark plugs


Hi mate start at the easiest point which will be to check your EARTH to make sure everything is earthed.

Feb 06, 2015 | Dodge Cars & Trucks

1 Answer

My mother has a 1993 Oldsmoblile Cutlass Cierra. It's a 3.3. She had a new engine put in it last year. Now her car died yesterday. She had to have it towed home so my brother could look at it. He got...


Check for spark. My guess would be the ignition module going out, but could also be the crank sensor. The module sits under the coils. Check all coils for spark. If any coil doesn't spark, you can try replacing just that coil, but the problem may still be the module underneath. If you have a meter, run a resistance check on each coil from the terminals to ground. If the same coil that doesn't fire aslo has a different resistance, replace that coil.
If you have a meter, check the AC voltage on each of the crank sensor wires shown as compared to ground or battery positive. If the AC voltages are different on the three wires, suspect the sensor is bad, but also check the tone ring on the pulley (Fig 2 below) for any damage.
Please see my tip at http://www.fixya.com/cars/r5821173-doesnt_car_start_gasoline_engines for how to check for spark. These are genericinstructions.
The 3.3L engine is the only one with the C 3 I system. REMOVAL and INSTALLATION C3I Module See Figure 1
  1. Disconnect the negative battery cable.
  2. Unplug the 14-way connector at the ignition module.

jturcotte_1656.gif
Fig. Fig. 1: Distributorless C 3 I coils and module system - 3.3L engine
  1. Tag and disconnect the spark plug wires at the coil assembly.
  2. Remove the nuts and washers securing the C 3 I module assembly to the bracket.
  3. Remove the 6 bolts attaching the coil assemblies to the ignition module.

To install:
  1. Install the coil assemblies to the ignition module and install the 6 attaching bolts.
  2. Install the nuts and washers attaching the assembly to the bracket.
  3. Connect the spark plug wires.
  4. Engage the 14-way connector to the module.
  5. Connect the negative battery cable, then reset the clock, radio and any other accessories.

Ignition Coil(s)
  1. Disconnect the negative battery cable.
  2. Tag and disconnect the spark plug wires.
  3. Remove ignition coil attaching bolts, then the ignition coil from the module.

To install:
  1. Install the coil(s) and attaching bolts.
  2. Connect the spark plug wires.
  3. Connect the negative battery cable, then reset the clock, radio and any other accessories.

Dual Crankshaft Sensor
See Figures 2, 3 and 4
  1. Disconnect battery negative cable.
  2. Remove serpentine belt from crankshaft pulley.
  3. Raise and safely support the vehicle.
  4. Remove right front tire and wheel assembly, then the inner access cover.
  5. Remove crankshaft harmonic balancer retaining bolt and crankshaft harmonic balancer.
jturcotte_1657.gif

Fig. Fig. 2: Harmonic balancer with interrupter rings on C 3 I system
  1. Unplug the electrical connector from the sensor and remove the crankshaft sensor from the vehicle.

To install:
  1. Loosely install the crankshaft sensor on the pedestal.
jturcotte_1658.gif

Fig. Fig. 3: Dual crankshaft sensor - C 3 I system
  1. Position the sensor with the pedestal attached on special tool J-37089.
  2. Position the tool on the crankshaft.
  3. Install the bolts to hold the pedestal to the block face. Tighten to 14-28 ft. lbs. (20-40 Nm).
  4. Tighten the pedestal pinch bolt to 30-35 inch lbs. (3-4 Nm).
  5. Remove special tool J-37089.
  6. Place special tool J-37089 on the harmonic balancer and turn. If any vane of the harmonic balancer touches the tool, replace the balancer assembly.

A clearance of 0.025 inch is required on either side of the interrupter ring. Be certain to obtain the correct clearance. Failure to do so will damage the sensor. A misadjusted sensor of bent interrupter ring could cause rubbing of the sensor, resulting in potential driveability problems, such as rough idle, poor performance, or a no start condition.
  1. Install the balancer on the crankshaft and install the crankshaft balancer bolt. Tighten to 200-239 ft. lbs. (270-325 Nm).
  2. Install the inner fender shield.
  3. Install the tire and wheel assembly. Tighten to 100 ft. lbs. (140 Nm).
  4. Lower the vehicle.
  5. Install the serpentine belt.
  6. Connect the negative battery cable, then reset the clock, radio and any other accessories.
jturcotte_1659.gif

Fig. Fig. 4: Distributorless C 3 I positioning tool J-37089 for installing dual crankshaft sensor.system - 3.3L engine

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1 Answer

1995 gmc jimmy 4wd 4.3 vortec when hot dies and won"t start, replaced plugs wires cap rotor, oil pressure switch, camshaft and crankshaft sensors, ignition control module. still getting spark and over...


The problem is either your fuel pump relay is overheating our your fuel pump is over heating. They also have the problem with the wire connector on top of the fuel pump melts. This is a known problem with them, when you but a new fuel pump they give you a new connector and a service bullentin regarding this problem.

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3 Answers

My 95 gmc jimmy will turn over but won't start.


Are you getting fuel and check for spark and if all is well, then move to your fuel pump and if checks out okay , ignition module and pick up module and coil have checked out .

Sep 24, 2009 | 1995 GMC Jimmy

1 Answer

Need to know what fires coil 1995 mercury sable both wires to coil have power when key is turned on car cranks no spark from coil new coil what gives the coil extra power to fire


what engine? 3.0L 2 Valve? 4 Valve?
3.4L SHO engine?

The PCM (engine computer) fires the coils, but it is never the cause of a problem. I suspect it is the crankshaft position sensor on the front of the engine by the crank pulley. easy to change.

Crankshaft Position Sensor The crankshaft position sensor (CKP sensor) (6C315) is a variable reluctance sensor triggered by a 36-minus-1 tooth trigger wheel located on the crankshaft pulley and damper. The signal generated from the crankshaft position sensor is called the crankshaft position (CKP) signal, which provides base timing and crankshaft speed (rpm) information to the ignition control module (ICM) (12K072). Base timing is set at 10±2 degrees before top dead center (BTDC) AND IS NOT ADJUSTABLE. The powertrain control module (PCM) (12A650) will use this information with the spark advance information to determine ignition coil (12029) turn on or turn off time.

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3 Answers

Im not getting any spark in my 96 Corsica


Ignition module may be bad. It should be located under the coils, the coils usually plug into the ignition module. Also might be a bad crank or cam sensor

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