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OT mechanics: correlation between weak battery and engine performance paramaters
Posted on 2/15/17 at 10:39 pm
Posted on 2/15/17 at 10:39 pm
My high mileage silverado had been smoking on startup and burning oil. I figured it was the valve seals or suchlike. I didn't want to sink a whole lot of money into it so as long as that was the only symptom I kept it topped up and went on my way.
Then my battery died and I replaced it. The first thing I noticed on restarting is it smoked like a Colorado stoner for a few minutes. Since then, it has hardly smoked at all, and it also seems to be running smoother. Is there any rational explanation for this?
Then my battery died and I replaced it. The first thing I noticed on restarting is it smoked like a Colorado stoner for a few minutes. Since then, it has hardly smoked at all, and it also seems to be running smoother. Is there any rational explanation for this?
5
Posted on 2/15/17 at 10:41 pm to Jim Rockford
Car AIDS. You just came out of a flare up.
Posted on 2/15/17 at 10:43 pm to Jim Rockford
I'm not a mechanic but I've had strange, seemingly-mechanical problems fixed by replacing a worn battery. Maybe something to do with faulty sensor readings on startup due to voltage issues causing engine systems to make unintended/unnecessary adjustments.
Posted on 2/16/17 at 12:35 am to Jim Rockford
It would be nice to know what year vehicle you are talking about and what "high mileage" is.
But yes, low voltage or voltage drop under load can cause a myriad of problems with modern vehicles.
Also, it may be a lambda sensor on its way out. IE the battery was only a little bit out of voltage spec but the sensor only operated well at higher voltages.
Additionally, removing the battery can reset the ECU and cause it to relearn the operating parameters and change mixture accordingly.
But yes, low voltage or voltage drop under load can cause a myriad of problems with modern vehicles.
Also, it may be a lambda sensor on its way out. IE the battery was only a little bit out of voltage spec but the sensor only operated well at higher voltages.
Additionally, removing the battery can reset the ECU and cause it to relearn the operating parameters and change mixture accordingly.
This post was edited on 2/16/17 at 12:35 am
Posted on 2/16/17 at 12:39 am to Jim Rockford
This is why I just buy a new car everytime it needs an oil change
Posted on 2/16/17 at 1:09 am to Jim Rockford
$$$$$
Posted on 2/16/17 at 1:18 am to Tactical Insertion
My guess would be ecu reset as well but can not think of how anything ecu controlled could cause oil burning. Electronic pcv control perhaps or cylinder deactivation control.
Curious to hear responses from more knowledgeable posters...
Curious to hear responses from more knowledgeable posters...
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