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Old 06-09-2021, 05:19 PM   #1
1999SaturnSW1
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Default 1999 Saturn SW-2 Ignition Module???

I think my ignition module is bad so does someone recommend a certain brand part number replacement (I see they cost between $68 to $150)?

Backstory:

Car ran great...then while driving it suddenly began to run really rough and very little power...limped home the remaining 150 miles using 1 full tank of gas because engine would only maintain 60 MPH in 3rd gear and any stops I had to select Neutral and rev it up to 1500 RPM to keep the engine from stalling...acceleration was almost non-existent so don't try this at home kids...just say'in...

Troubleshooting:

-Kicked out P0300 Multiple misfire and cam sensor (THERE IS NOT STINKING CAM SENSOR IN THIS CAR)!!!

-Compression check all 4 cylinders above 175 PSI

-Replaced spark plugs and wires...still rough

-Should have read this forum first...because I then performed the following:

-Removed all 4 plug wires AT THE COIL PACKS and had assistant attempt to start the engine and I saw sparks jumping between the two passenger side coil towers but not the drivers side two coil towers.

-Swapped coil packs left to right and saw the same thing...sparks jumping between passenger coil towers but not driver side towers so I confirmed that both ignition coils are good...so now it must be the ignition module...

Any suggestions greatly appreciated
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Old 06-09-2021, 06:11 PM   #2
billr
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Default Re: 1999 Saturn SW-2 Ignition Module???

It could be the wiring to the ICM. R & R the harness connectors to the ICM and try again. Just "wiping" those connector contacts may heal it. No Joy? Then back-probe the drive signals to the two IC coil drivers; with engine cranking/running (ICM connected to harness). You should get some AC voltage on those wires, I'm guessing 1-5VAC; just see if they are about the same.

I think those two signal wires are C (ORG) and E (WHT) on your '99
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Old 06-13-2021, 12:29 AM   #3
TomM96
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Default Re: 1999 Saturn SW-2 Ignition Module???

Where is car driven--

If in lots roadsalt, the insulating varnish coating the coil form segments
peels off, and the steel segments rust.

The IgMod is subject to road dust, etc.

There are electric grounding eyelets from the coils to beneath the
bolts securing the IgMod.

When i bought my 2000DOHC few years ago, it had an uneven idle.
That issue, and a few others resolved after cleaning engine
compartment grounds.
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Old 06-14-2021, 09:35 PM   #4
1999SaturnSW1
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Default Re: 1999 Saturn SW-2 Ignition Module???

Hi All GREAT report...its fixed!!!

It was the ignition module.

If anyone has the same issue...

-poor running
-low power
-rough running
-Service Engine Light FLASHING (it flashes when there is an issue with the engine that will damage the catalytic converter.
-Code P0300
-Code P0341/ P0342/ P0343/ P0344


Here are the steps to troubleshoot:

-Removed all 4 plug wires AT THE COIL PACKS (mark the two passenger side wires as pax and the driver side two wires as driver) and had assistant attempt to start the engine and you should see sparks jumping between the two passenger side coil towers and sparks jumping between the two driver side coil towers)

-If you can see sparks jumping between the two passenger side coil towers...AND...there is also sparks jumping between the two driver side coil pack towers then you know that both coil packs are good and that the ignition module and the wires that power the ignition module are good. In this case the issue is one of the following 1. Bad ignition wire(s). 2. Bad spark plug(s). 3. Bad fuel injector(s) 4. Bad head gasket or crack in head ...so do a compression check and if all cylinders have more than 175 PSI then the issue is is either 1-3

-If one side coil pack does not have sparks jumping then swap the two coil packs left to right and if the trouble follows then it is a coil pack...if the problem does not follow then you know both coil packs are good and the problem is either the wires going to the ignition module or the ignition module itself.

So that is how I will troubleshoot the next time
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