Question about 1991 Pontiac Grand Am

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Need plug wire order to coil packs.

1991 grand am with 2.5L. I believe its a C3I ignition system: two coil packs over mounted over ignition module with a sensor that goes into block to the crankshaft. My Haynes manuel has two different diagrams in two seperate sections: first shows spark plug wires are attached to the coils from top to bottom 2-3-4-1; the other shows 3-2-4-1. Which is correct if either is correct?

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  • 2 Answers

SOURCE: 93 pontiac grand am

This happened to me on my 93 grand am. I also like you got new sensors and a new computer which did not fix the problem. It turned out to be a cracked wire at the battery. Thats right a wire on the positive side of the battery that wasn't even broke all the way through. I re spliced the wire and VAROOOOM it fired right up.

Posted on Jan 13, 2009

blueextc3221
  • 15935 Answers

SOURCE: car wont start

I noticed you replace the crankshaft sensor, but not the CAMshaft sensor.
The Ignition module takes the input of both sensors to tell the coil when to energize.
This sensor should come up as an error code when you attach a obd reader.
Even if your light is not on - there may be a code. If it is not your vehicle originally, some people pull the bulb!

Posted on Jan 22, 2009

daves944
  • 1050 Answers

SOURCE: 2003 grand am 3.4 code p0304

More likely a plugged injector as that code is specific to cylinder # 3 These engines are also very prone to failed intake manifold gaskets and stuck valve lifters. I think I'd start with a compression test, if that's good, go injector. If the compression is bad, you've got a can of worms. Hold off on the O2, I don't think it's related.

Posted on Mar 14, 2009

  • 158 Answers

SOURCE: spark plug wiring diagram for gm 3.4 liter v6

http://autorepair.about.com/od/enginefiringorders1/Engine_Firing_Orders.htm

Posted on Aug 30, 2009

  • 110 Answers

SOURCE: i have a 99 grand am SE 2.4 4 cylinder and my

A misfire doesn't always have to be ignition... it's just the most common cause. Faulty or plugged injector, low compression. You need to check fuel pressure and test the fuel injector flow. Then check compression. If you don't have tools for these tests, take it to someone who does. Testing is much cheaper than throwing parts at the problem.

Posted on Feb 25, 2010

  • 2 Answers

SOURCE: I have 2002 pontiac grand am 2.2 liter. Car shut

Could be the timing chain/belt. Common problem with 2.4 engines.

Posted on Aug 12, 2010

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Have a 1986 chevy celebrity tec4 an have no fire from coil ive replaced coil checked fuses an have power going to coil still no fire


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if c3i coil and module the module could be the problems you can check it before replace
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Hey there,i have a 1991 msuatng LX with the 2.3L ho engine running an 8 plug head. it sounds like i may have a misfire of some sort or my timing may be out but im not sure how to tell, could someone give...


Insert each wire on the proper terminal of the ignition coil. Ensure that the coil boots are fully seated and both locking tabs are engaged. The terminals are identified on the ignition coils. Install wires as shown in the illustration. The 2.3L firing order is 1-3-4-2 for both ignition coil assemblies.

Distributorless Ignition System In the distributorless ignition system (DIS), all engine timing and spark distribution is handled electronically with no moving parts. This system has fewer parts that require replacement and provides a more accurately timed spark. During basic operation, the EEC-IV determines the ignition timing required by the engine and a DIS module determines which ignition coil to fire.

Components
The distributorless ignition system (DIS) for the 2.3L twin spark plug engine consists of the following components:
  • Crankshaft timing sensor
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  • Two ignition coil packs
  • Spark angle portion of EEC-IV
Crankshaft Timing Sensor
The crankshaft timing sensor is a dual hall effect magnetic switch, which is actuated by the dual vane cup on the crankshaft pulley hub assembly. This sensor generates two separate signals, PIP (profile ignition pick-up) and CID (cylinder identification). The PIP signal provides base timing and RPM information, while the CID signal is used to synchronize the ignition coils. Initial timing (base timing) is set at 10 degrees BTDC and is not adjustable. Ignition Coil Packs
Two ignition coil packs are used for the 2.3L dual plug engine. The two ignition coil packs are triggered by the DIS module and are timed by the EEC-IV. Each coil pack contains two separate ignition coils for a total of four ignition coils. Each ignition coil fires two spark plugs simultaneously, one spark plug on the compression stroke and one on the exhaust stroke. The spark plug fired on the exhaust stroke uses very little of the ignition coils, stored energy, and the majority of the ignition coils, energy is used by the spark plug on the compression stroke. Since these two spark plugs are connected in series, the firing voltage of one spark plug will be negative with respect to ground, while the other will be positive with respect to ground. Refer to thePowertrain Control/Emissions Diagnosis Manual for additional information on spark plug polarity. DIS Module
The main function of the DIS module is to switch between ignition coils and trigger the coils to spark. The DIS ignition module receives the PIP and CID signals from the crankshaft timing sensor, and the SPOUT (spark out) signal from the EEC-IV module. During normal operation, PIP is passed on to the EEC-IV module and provides base timing and RPM information. The CID signal provides the DIS ignition module with the information required to switch between the coils for cylinders 1 and 4 and the coils for cylinders 2 and 3. The SPOUT signal (from the EEC-IV) contains the optimum spark timing and dwell time information. The dwell time is controlled or varied by varying the duty cycle (duration) of the SPOUT signal. This feature is called CCD (computer controlled dwell). Therefore, with the proper inputs of PIP, CID and SPOUT the DIS ignition module turns the ignition coils on and off in the proper sequence for spark control. CID is also sent to the EEC-IV micro-processor to allow for Bank to Bank fuel control. Failure Mode Effects Management
During some DIS system faults, the Failure Mode Effects Management (FMEM) portion of the DIS ignition module will maintain vehicle operation. If the DIS ignition module does not receive the SPOUT input, it will automatically turn the ignition coils on and off using the PIP signal. However, this will result in fixed spark timing (ten degrees BTDC) and a fixed dwell time (no CCD). If the DIS ignition module does not receive the CID input during engine cranking, random coil synchronization will be attempted by the module. Therefore, several start attempts (cycling the ignition from OFF to START) may be required to start the engine. If the DIS module loses CID input while engine is running, the module will remember the proper firing sequence and continue to fire to maintain engine operation. Dual Plug Inhibit
Dual Plug Inhibit (DPI) is a function of the EEC-IV that is only used when the vehicle is being started at temperatures -7° C (20° F) and below. During engine cranking, the EEC-IV will only fire the spark plugs on the right hand side of the engine. When the engine has started, the EEC-IV will send a signal to the DIS module to start normal dual plug operation. Ignition Diagnostic Monitor
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Fig. 2: Electrical schematic on C3I ignition system 86812031.gif Both DIS and C3I system consists of the coil pack, ignition module, crankshaft sensor, interrupter rings and ignition control module (ICM). All components are serviced as complete assemblies, although individual coils are available for Type 2 coil packs. Since the ICM controls the ignition timing, no timing adjustments are necessary or possible. Fig. 3: Wiring schematic used on the C3I ignition system 86812032.gif Fig. 4: Notch effect on the output signal used on the crankshaft sensor 86812033.gif
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found a good repair manual and followed the wiring diagram ~~~ Thank You / Jeff

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