white smoke, low power - Chevy and GMC Duramax Diesel Forum
04.5-05 LLY Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect

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Old 08-18-2012, 07:14 PM   eBay Motors  #1 (permalink)
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white smoke, low power

hey guys, so ive noticed lately that my truck is smoking more white/grey than nice and black like it used to, and its a little low on power. i just did the gm injector cleaning on it and my balance rates are at idle:
1: -.8
2: -.4
3: -.8
4: .6
5: 1.5
6: .6
7: .5
8: -1.6
fuel rate is 14.0 with a/c on and 7.5 without a/c and my rail pressure seems to be all over, 1000 psi more actual than commanded at times, and lower than commanded at other times. im certain that my fpr is bad cuz it loped really bad before i put my airdog on and it was loping really bad when i was doing the injector cleaning. my fuel pressure is set at 12 psi and at wot it drops to about 8 psi. any ideas on what could be wrong would be much appreciated.
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Old 08-19-2012, 04:32 AM   eBay Motors  #2 (permalink)
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Quote:
Originally Posted by dirty_maxx View Post
hey guys, so ive noticed lately that my truck is smoking more white/grey than nice and black like it used to, and its a little low on power. i just did the gm injector cleaning on it and my balance rates are at idle:
1: -.8
2: -.4
3: -.8
4: .6
5: 1.5
6: .6
7: .5
8: -1.6
fuel rate is 14.0 with a/c on and 7.5 without a/c and my rail pressure seems to be all over, 1000 psi more actual than commanded at times, and lower than commanded at other times. im certain that my fpr is bad cuz it loped really bad before i put my airdog on and it was loping really bad when i was doing the injector cleaning. my fuel pressure is set at 12 psi and at wot it drops to about 8 psi. any ideas on what could be wrong would be much appreciated.

That FPR is shot, change it out first and then see if you still have issues.
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Old 08-19-2012, 04:39 AM   eBay Motors  #3 (permalink)
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also try the fprv. might need to shim or plug
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Old 08-19-2012, 04:41 AM   eBay Motors  #4 (permalink)
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Originally Posted by TDIpowered View Post
also try the fprv. might need to shim or plug

Agreed, change the FPR first, then bottle test the FPRV right after.
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Old 08-19-2012, 11:15 AM   eBay Motors  #5 (permalink)
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sorry i forgot to put in my signature that my rail is plugged. ill try the fpr and see where it goes from there. thanks guys
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