1990 blue smoke when cold - Competition Diesel.Com

jpschade · 12-19-2016, 05:04 PM

I have a 1990 w250 5 speed, I put new motor in over the summer that supposedly had 115k on it. original motor started knocking at about 500k. I used to get quite a bit of blue smoke with original motor on cold starts but I think newer motor smokes more. Only thing I swapped over from original motor was the ve and I have it rotated all the way to the head. No blow by, turbo is tight, downpipe is dry. It smokes bad on first start up and will start smoking if I let it sit for 5 minutes idling. Just noticed it tonight, if I hold it wot in 5th itll start chugging and doesn't feel like clutch is slipping. I have a high volume piston style lift pump coming for it anyway because current one is leaking, wondering if lift pump could be taking a sh!t . thanks

Ram12vcummins · 12-19-2016, 06:21 PM

White smoke is usually antifreeze of lean fuel mixture. Blue smoke is oil.

chevota84 · 12-19-2016, 10:18 PM

Have you smelled it? Oil is pretty distinctive.

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jpschade · 12-20-2016, 05:50 AM

doesnt smell like oil

*zfaylor* · 12-20-2016, 07:41 AM

Pull your downpipe off and look for oil in the pipe and turbine housing. If there is oil, pull the turbo and look for traces of oil in the manifold. If there is oil, pull the manifold and look to see which cylinders.

I would bank on valve seals or turbo seals. Blue smoke is oil related somewhere.

smokinVE · 12-20-2016, 07:55 AM

Do you have a spare set of injectors to swap? You're saying blue but the symptoms you listed sound like injectors.

jpschade · 12-20-2016, 11:11 AM

I threw in a spare set but didn't make much of a difference. Pulled dp everything was dry

Stuffy · 12-20-2016, 12:19 PM

Check the intake side too

Ram12vcummins · 12-20-2016, 12:57 PM

If it clears up when warm or starts to haze when cools off could be rings too.

Begle1 · 12-20-2016, 02:25 PM

Some blue smoke on a cold diesel on start-up is pretty normal and not necessarily a sign of burning motor oil; fuel itself also can make blue smoke with low-enough temperatures, especially with lower compression.

jpschade · 12-20-2016, 06:12 PM

I will check turbo again but smoke doesn't smell like oil smells more like fuel

Ram12vcummins · 12-20-2016, 07:14 PM

Quote:

Originally Posted by jpschade

I will check turbo again but smoke doesn't smell like oil smells more like fuel

With bad rings the compression could be low also causing smoke and a raw fuel smell.

Begle1 · 12-20-2016, 09:49 PM

Quote:

Originally Posted by Ram12vcummins

With bad rings the compression could be low also causing smoke and a raw fuel smell.

Almost everything you do to hot-rod your engine makes cold start-up blue smoke worse than stock.

Low compression pistons? More blue smoke when it's cold outside.
Nice, big intercooler? More blue smoke when it's cold outside.
Big turbo? More blue smoke when it's cold outside.

Just tell yourself it's an indicator of more horsepower, not worn out piston rings.

95cummins5.9 · 12-20-2016, 10:14 PM

Nature of the beast.

12-19-2016, 05:04 PM	#1
jpschade Name: jpschade Title: Green Behind the Ears Status: Not Here Join Date: Mar 2012 Member`s Gallery Posts: 58	1990 blue smoke when cold I have a 1990 w250 5 speed, I put new motor in over the summer that supposedly had 115k on it. original motor started knocking at about 500k. I used to get quite a bit of blue smoke with original motor on cold starts but I think newer motor smokes more. Only thing I swapped over from original motor was the ve and I have it rotated all the way to the head. No blow by, turbo is tight, downpipe is dry. It smokes bad on first start up and will start smoking if I let it sit for 5 minutes idling. Just noticed it tonight, if I hold it wot in 5th itll start chugging and doesn't feel like clutch is slipping. I have a high volume piston style lift pump coming for it anyway because current one is leaking, wondering if lift pump could be taking a sh!t . thanks __________________ 97 dodge eclb SAC 5x14's, 467.7 fmw , 024s, tork tek ofv, fully built trans, dpc triple disc, no fuel plate, afc live, 4k gov springs, 28* timing, t4 steed w/ 44mm tial, racked barrels 1990 w250 5 speed cranked pump 2006 rclb 4wd stock for now Last edited by jpschade; 12-19-2016 at 05:13 PM. Reason: forgot info

12-19-2016, 10:18 PM	#3
chevota84 Name: chevota84 Title: Too Much Time Status: Not Here Join Date: Jul 2009 Location: Prineville, OR Member`s Gallery Posts: 4,926	Have you smelled it? Oil is pretty distinctive. Sent from my SM-G930V using Tapatalk __________________ 99 Dodge 2500 with stuff

12-20-2016, 05:50 AM	#4
jpschade Name: jpschade Title: Green Behind the Ears Status: Not Here Join Date: Mar 2012 Member`s Gallery Posts: 58	doesnt smell like oil __________________ 97 dodge eclb SAC 5x14's, 467.7 fmw , 024s, tork tek ofv, fully built trans, dpc triple disc, no fuel plate, afc live, 4k gov springs, 28* timing, t4 steed w/ 44mm tial, racked barrels 1990 w250 5 speed cranked pump 2006 rclb 4wd stock for now

12-20-2016, 07:41 AM	#5
zfaylor Name: zfaylor Title: Comp Diesel Sponsor Status: Not Here Join Date: Nov 2010 Location: P-TOWN!, Indiana Member`s Gallery Posts: 5,024	Pull your downpipe off and look for oil in the pipe and turbine housing. If there is oil, pull the turbo and look for traces of oil in the manifold. If there is oil, pull the manifold and look to see which cylinders. I would bank on valve seals or turbo seals. Blue smoke is oil related somewhere. __________________ 2015 half ton heavy chevy 81 Fairmont LS project Many yard ornament projects... North American Turbo

12-20-2016, 11:11 AM	#7
jpschade Name: jpschade Title: Green Behind the Ears Status: Not Here Join Date: Mar 2012 Member`s Gallery Posts: 58	I threw in a spare set but didn't make much of a difference. Pulled dp everything was dry __________________ 97 dodge eclb SAC 5x14's, 467.7 fmw , 024s, tork tek ofv, fully built trans, dpc triple disc, no fuel plate, afc live, 4k gov springs, 28* timing, t4 steed w/ 44mm tial, racked barrels 1990 w250 5 speed cranked pump 2006 rclb 4wd stock for now

12-19-2016, 06:21 PM	#2
Ram12vcummins Name: Ram12vcummins Title: Too Much Time Status: Not Here Join Date: Mar 2015 Member`s Gallery Posts: 1,659	White smoke is usually antifreeze of lean fuel mixture. Blue smoke is oil.

12-20-2016, 12:19 PM	#8
Stuffy Name: Stuffy Title: First Gen Status: Not Here Join Date: Jan 2013 Location: Washington Member`s Gallery Posts: 138	Check the intake side too __________________ 92 w250 with some pump work silver bullet 47re manual valve body

12-20-2016, 12:57 PM	#9
Ram12vcummins Name: Ram12vcummins Title: Too Much Time Status: Not Here Join Date: Mar 2015 Member`s Gallery Posts: 1,659	If it clears up when warm or starts to haze when cools off could be rings too.

12-20-2016, 02:25 PM	#10
Begle1 Name: Begle1 Title: Too Much Time Status: Here Join Date: Nov 2007 Location: Kihei, Maui Member`s Gallery Posts: 4,143	Some blue smoke on a cold diesel on start-up is pretty normal and not necessarily a sign of burning motor oil; fuel itself also can make blue smoke with low-enough temperatures, especially with lower compression. __________________ 1990 D-250 Regular Cab: Automatic transmission, turkey air horn, wires.

12-20-2016, 06:12 PM	#11
jpschade Name: jpschade Title: Green Behind the Ears Status: Not Here Join Date: Mar 2012 Member`s Gallery Posts: 58	I will check turbo again but smoke doesn't smell like oil smells more like fuel __________________ 97 dodge eclb SAC 5x14's, 467.7 fmw , 024s, tork tek ofv, fully built trans, dpc triple disc, no fuel plate, afc live, 4k gov springs, 28* timing, t4 steed w/ 44mm tial, racked barrels 1990 w250 5 speed cranked pump 2006 rclb 4wd stock for now

12-20-2016, 10:14 PM	#14
95cummins5.9 Name: 95cummins5.9 Title: Old man *** gossiper Status: Not Here Join Date: Jun 2012 Location: U.S.A Member`s Gallery Posts:** 4,720	Nature of the beast.