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Old 09-15-2014, 12:41 PM   #1
Moskvitch
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2000 SL2
Default p0440 after EGR cleaning

Hi all,

Yesterday i cleaned my EGR (wasn't too bad, but cleaned it regardless.). Everything was fine when i test drove it after. Now today, on my way back from school, i got a p0440 while on the highway.

I also cleaned my throttle body the day before and replaced the upstream O2 sensor.

All of this was in hopes of smoothing out the idle and curing what seemed to be an overly rich mixture.

Any ideas?

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Old 09-15-2014, 01:17 PM   #2
Dennyj1992
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Default Re: p0440 after EGR cleaning

Just a thought, but did you make sure you tightened the EGR Valve and the TB back into place nice and snug? Also, were there any rips in either gasket?

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99 SL2, DOHC, 4 speed A/T. Wife's car. 114k.
02' SC2, DOHC, 5 speed M/T. Current DD. 191k.

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Old 09-15-2014, 01:59 PM   #3
Moskvitch
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Default Re: p0440 after EGR cleaning

Thanks for your input.

Found the issue: a small vacuum line behind the TB leading down to the EGR "junction box" had come off its fitting. With a proper clamp it's now sealed. This was also causing a suction sound near the TB.

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Old 09-15-2014, 02:32 PM   #4
Dennyj1992
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Default Re: p0440 after EGR cleaning

Nice job finding that so quickly!

It's always good to find an issue that's easy to fix and costs virtually nothing. Happy driving!

...
99 SL2, DOHC, 4 speed A/T. Wife's car. 114k.
02' SC2, DOHC, 5 speed M/T. Current DD. 191k.

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