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Old 04-26-2014, 10:59 PM   #1
claregina
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Default Can U solve my SC1 MYSTERY

I have a really good 1999 SC1 Mystery. Please solve if you can.

Here are my consistent problems:
1. Starts Cold but not when temp is past 1/4 mark.
2. Code: Multiple Misfires
3. Runs smooth like kitten when cold. When it nears 1/4 temp mark it starts running really rough. Can feel the difference and muffler sound like outboard boat motor.
4. Idles up and down by -300/+300 RPM when near or at the 1/4 temp mark.
5. Will start to overheat when stopped for too long or left in park for awhile.

I have replace the following:
spark plugs, Ignition wires, Fuel pump, fuel filter, Both Ignition Coil Packs, Ignition Control Module, Crankshaft Position Sensor.

I have also cleaned the Throttle body and its sensors. Also cleaned all the injectors. Cleaned the MAP.

Thoughts?

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Old 04-26-2014, 11:03 PM   #2
OldNuc
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Location: Far Southwestern Iowa
Posts: 63,586
 

1998 SC2
Default Re: Can U solve my SC1 MYSTERY

Replace the ECTS and inspect the 2 wires for any splices. If you find any cut them out and properly solder and heat shrink them.

Check the exhaust system for leaks this way.
Exhaust leak check.
--Locate a low pressure high volume air source, reversible vacuum cleaner, large fan, leaf blower or what ever you can find.
--Loosely couple to cold exhaust at the tail pipe, or direct fan at tail pipe.
--Spray every inch of the exhaust between the head and CAT inlet with a mixture of 2 or 3 drops of dish soap and water in a spray bottle.
--Pay close attention to the lower flange, lower support clamp, and flex connector.
--The flex connector is under the protective braid so it requires quite a bit of solution to show any leaks.

If you replaced the OEM fuel filter with anything but a WIX 33731 you will eventually have fuel pressure problems. http://www.rockauto.com is the low cost parts source.

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