Coincidence? Or....
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9 ECHO 1
Joined: Aug 2009
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From: Missouri
Coincidence? Or....
So the other day I tried to get my truck to mimic a hard start. I disconnected one battery and cranked it over. It started almost like normal, maybe one more revolution than normal. Nothing that made me suspicious. But I noticed smoke (black) from my tail pipe. I know this CAN be normal, but have never noticed it on my truck.
So I tried it again. Yupp. Black smoke. But what was that? White smoke... Now I have heard that hard starts can produce white smoke (True/False?). So I plugged the battery back in, and started again. Less smoke, still some. Both black and white. A few more times. Same result. Decreasing in amount each time.
So my question is, did I cause the white smoke, or do I need to hunt for a problem?
Also, what is the deal with the black smoke on start up? Normal? I've seen it on other trucks before, but never mine.
So I tried it again. Yupp. Black smoke. But what was that? White smoke... Now I have heard that hard starts can produce white smoke (True/False?). So I plugged the battery back in, and started again. Less smoke, still some. Both black and white. A few more times. Same result. Decreasing in amount each time.
So my question is, did I cause the white smoke, or do I need to hunt for a problem?
Also, what is the deal with the black smoke on start up? Normal? I've seen it on other trucks before, but never mine.
Senior User
Joined: May 2011
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From: West ID
I have never had black smoke at start, but when my GPR went bad last winter I did get a ton of white smoke when it was in the 20's. I think it's possible, by disconnecting the one battery, you cut off some of the voltage to the glow plugs and they didn't get enough to energize fully?
That's my logic at least; less energy in the GP's and therefore more unburnt fuel causing white smoke.
I'll be honest, I don't really have a vast knowledge of the glow plug systems on these trucks so I'm not sure if having only one battery connected can affect it in such a manner.
That's my logic at least; less energy in the GP's and therefore more unburnt fuel causing white smoke.I'll be honest, I don't really have a vast knowledge of the glow plug systems on these trucks so I'm not sure if having only one battery connected can affect it in such a manner.
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9 ECHO 1
Joined: Aug 2009
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From: Missouri
I have never had black smoke at start, but when my GPR went bad last winter I did get a ton of white smoke when it was in the 20's. I think it's possible, by disconnecting the one battery, you cut off some of the voltage to the glow plugs and they didn't get enough to energize fully? That's my logic at least; less energy in the GP's and therefore more unburnt fuel causing white smoke.
I'll be honest, I don't really have a vast knowledge of the glow plug systems on these trucks so I'm not sure if having only one battery connected can affect it in such a manner.
That's my logic at least; less energy in the GP's and therefore more unburnt fuel causing white smoke.I'll be honest, I don't really have a vast knowledge of the glow plug systems on these trucks so I'm not sure if having only one battery connected can affect it in such a manner.
Senior User
Joined: May 2011
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From: West ID
(don't worry, my roots are down in the SW)It may be a good idea to test your glow plug system as a whole. How many miles are on your truck? Mine all went from fine to usless overnight around 195k.
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9 ECHO 1
Joined: Aug 2009
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From: Missouri
You California guys wouldn't know a cold start if it came up and froze your door handles shut. (don't worry, my roots are down in the SW)
It may be a good idea to test your glow plug system as a whole. How many miles are on your truck? Mine all went from fine to usless overnight around 195k.
(don't worry, my roots are down in the SW)It may be a good idea to test your glow plug system as a whole. How many miles are on your truck? Mine all went from fine to usless overnight around 195k.
I've got 156k on the clock, and just replaced my GPCM. So I should be good.
Senior User
Joined: May 2011
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From: West ID
Ah right I forgot about the Cali GPCM. How about glow plugs themselves? I do think 156k is a little early, especially in warm weather country, but you never know.
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9 ECHO 1
Joined: Aug 2009
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From: Missouri
Well, I havnt ohmed them, but I think they are good. When the GPCM went out it threw codes. Replacing it fixed it all.
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Post Fiend
Joined: May 2009
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From: Pea Ridge, AR
This would be pure theory, but in the event of a lower than optimal voltage situation, I wonder if sensor reference voltages could be affected enough to cause various fuel issues? That would be my guess anyway.
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Senior User
Joined: May 2011
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From: West ID
That does make sense to me, but this GPCM throws a bit of a wrench into my already shaky knowledge of the GP system. Last winter I just put new plugs in all the way around becuase I had a few bad apples, along with the relay. It gave me an excuse to do the o-rings I was needing to do as well.
Post Fiend
Joined: May 2009
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From: Pea Ridge, AR
That does make sense to me, but this GPCM throws a bit of a wrench into my already shaky knowledge of the GP system. Last winter I just put new plugs in all the way around becuase I had a few bad apples, along with the relay. It gave me an excuse to do the o-rings I was needing to do as well.
GPCM uses the same idea as a relay, just picture a relay with 8 wires going individual GP's instead of one main bus. This allows the PCM to individually notice faults.
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9 ECHO 1
Joined: Aug 2009
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From: Missouri
Precisely. Just like a normal relay taking really good notes.
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