This is my first diesel, so if this seems like a foolish question forgive me. I have 3200mi on LLY I have had it start smoking and knocking hard when I am getting up to around 75mphhttp://www.dieselplace.com/forum/smileys/smiley11.gif. I usually back off and let it slow down. Is this a factor of the motor not being to temp? It was about 50 deg. the (3) times it has happened. I took it to the dealer and they said they could not find anything wrong. I am running stanadyne. Any thoughts?


Thanks.http://www.dieselplace.com/forum/smileys/smiley4.gif

Ask them to reflash it.
<H1>04 6.6 LLY Smoke , Fuel Knock , Surging and High Injector Balance Rates - kw white black idle surge rough noise accelerate P0300 P0301 P0302 P0303 P0304 P0305 P0306 P0307 P0308 miss misfire SES DTC #PIP3129 - (Sep 10, 2004)</H1>


04 6.6 LLY Smoke, Fuel Knock, Surging, and High Injector Balance Rates


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The following diagnosis might be helpful if the vehicle exhibits the symptom described in the PI.<A name=ss1-1549221><A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=1549221&amp;psdid=437&amp;evc=sm#ss1-1549221" target="_blank">
<H5>Condition/Concern:</A></H5>


Customer concern may be a low speed surge (8 to 10 mph or near 1000 RPM), acceleration fuel knock noise at 1500 to 1800 RPM, rough idle, white smoke at idle, or high positive injector balance rates.<A name=ss2-1549221><A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=1549221&amp;psdid=437&amp;evc=sm#ss2-1549221" target="_blank">
<H5>Recommendation/Instructions:</A></H5>

<LI ="1">High positive injector balance rates (over +4.0 in park or +6.0 in drive) may be causing white smoke at idle or while driving.
<LI ="1">Document all injector cylinder balance rates at the beginning of the diagnosis.
<LI ="1">There is an updated calibration to address the white smoke, high positive balance rates, idle surge, and a fuel knock noise at or near 1500 to 1800 RPM.
<LI ="1">Install the updated calibration and evaluate the smoking, high injector balance rates, idle surge, and fuel knock noises.
<LI ="1">If there is still a mechanical concern with an injector, and balance rates are still over the SI specification of +4.0 in park or +6.0 in drive, replace only the effected injector. </LI>


NOTE: Before any injector replacements a large fuel sample should be taken from the fuel filter and checked for contaminants or poor quality.

It was reflashed after the first time. It has happened twice after the dealer reflashed it. I guess I will take it back and have it looked at again.