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Old 07-29-2011, 06:37 PM   #1
Audiovore
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Default 1997 SW1 - Rough idle

The engine light has been on for a while, the code reads 'Piston 3 Misfire' at Shucks. It idles really rough in gear and doesn't accelerate as well as it use to. I replaced the plugs(nothing changed), but then was told I should replace the wires too, any other easy/cheaper(<$50) things I should do too?

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Old 07-29-2011, 06:40 PM   #2
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1996 SW2
2003 VUE 2.2L
Default Re: 1997 SW1 - Rough idle

I'm assuming that was a P0303?

You might remove the ignition control module and clean the mating surfaces.

Is the idle really rough? What about doing a compression test?

shawn

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Old 07-29-2011, 07:20 PM   #3
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Default Re: 1997 SW1 - Rough idle

+1^^above, do a compression test... Harbor Freight sells a low cost tester( http://www.harborfreight.com/flex-dr...ter-92697.html ). Or you can get a loaner from the parts store. Perform your compression test this way.

If you want to obtain any compression test numbers that have any validity when relaying information in a forum environment crank the engine until the gauge quits increasing and compare both the final pressure and number of compression strokes to reach the max pressure, cylinder to cylinder. Any other method has no value for comparison in a setting like this. You can do this test either cold or hot or warm just mention it when stating results.

FYI if you find all cylinders produce a final reading of 200psi but the compression cycles are as follows: 1-8, 2-6, 3-8, 4-14 then it should be obvious that cylinder #4 has a serious problem with leakage past either the valves or compression rings. Attempting to compare your X number of strokes and a resulting pressure to what is expected is impossible.

FSM states the MINIMUM number of compression cycles is 10 and a Fully charged battery is required to obtain the full 250RPM cranking speed. The FSM also does not mention counting the compression cycles and recording them. This is because the high tech recording tester counts them for you and even a blind mechanic can see the differences on the chart. As most of us are doing this with a simple pressure gauge you have to count them yourself.

To prevent washing the cylinders down with fuel remove the PCM B fuse to shut off the fuel pump, injectors, and ignition before starting the test. Remove all spark plugs and block the throttle open. Use a low charge rate battery charger to fully charge the battery before conducting the test.

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