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Old 10-06-2011, 08:29 AM   #1
chainsaw064
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2001 SC2
Default Car running rough, replaced EGR

First time posting here. thanks to everyone who helps.

I was given a 2001 SC2 with 266k miles. This car runs great with the EGR disconnected. I was told to check the oil every 1000 miles, no smoke from the tail pipe or any leaks it just burns oil. I get 30 mpg. When I connect the EGR the car runs like a dog.

Yesterday, following another tread here. I replaced the EGR, CPS (this was fun), ECTS with any change. Where do I go from here?

Thanks
Dave

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Old 10-06-2011, 12:59 PM   #2
ehunter
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Location: Pacifica by San Francisco 5sp Engine rebuild with the help of people here at 177K due to 500mi/qt oil consumption. After 2yrs I am back to 40mpg+ after discovering the refirb head I used was bad. Car runs better than a top. Now at 205k.
Posts: 1,450

1996 SL2
Default Re: Car running rough, replaced EGR

What do you mean "disconnected"?

Do you mean only the wires disconnected or do you mean you unbolted it and blocked the holes off, and remounted the device back on the car?

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Old 10-06-2011, 05:31 PM   #3
chainsaw064
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2001 SC2
Default Re: Car running rough, replaced EGR

This would be with the connector disconnected. With it disconnected I get the P0405 code. I came home from work this evening and tried the two quarter trick blocking the EGR, with the connecter plugged in. I got the P0405 code right away, and it ran terrible.

Dave

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Old 10-06-2011, 09:57 PM   #4
ehunter
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Join Date: Nov 2010
Location: Pacifica by San Francisco 5sp Engine rebuild with the help of people here at 177K due to 500mi/qt oil consumption. After 2yrs I am back to 40mpg+ after discovering the refirb head I used was bad. Car runs better than a top. Now at 205k.
Posts: 1,450

1996 SL2
Default Re: Car running rough, replaced EGR

So the car runs great with the EGR wires pulled, and poorly when connected and the results were the same when you bought a replacement EGR.

Hmmmm If we are playing stump the chump, you got me...

Maybe some of our more senior experts like Oldnuc, Mad or Fdryer can advise.

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Old 10-06-2011, 10:16 PM   #5
td1238
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1999 SL2
Default Re: Car running rough, replaced EGR

If you put in a brand new EGR valve, and the engine works poorly when it's plugged in, and well when unplugged, then there is likely a fault in the wiring. Could also be a faulty valve sensor, but unlikely. You can test the valve sensor (center three terminals) with an ohmmeter. Measure between the center and each adjacent terminal, one at a time. Move pintle. Resistance should change smoothly and start and stop in the same place repeatedly.

If the fault is in the wiring, you can check the wiring by connecting it to the EGR valve. One end of the three center terminals should measure +5 volts. The other end of the three should measure 0 volts. The center terminal should vary as the pintle is moved.

The outer two terminals send voltage to the valve solenoid coil. Voltage should be 0 at both at idle. Voltage should increase at one as the valve is opened to varying degrees while cruising, and only while cruising.

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Old 10-07-2011, 07:06 AM   #6
chainsaw064
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Default Re: Car running rough, replaced EGR

what do you mean by moving pintle?

Thanks

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Old 10-07-2011, 09:12 AM   #7
td1238
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1999 SL2
Default Re: Car running rough, replaced EGR

The EGR valve contains a movable device called a pintle. This device performs the valving action.

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