Knowledgable truck guys....
10-09-2009, 05:50 PM
#1
Nontypical Buck
Thread Starter
Join Date: Oct 2005
Location:
Posts: 1,234
Knowledgable truck guys....
...my truck doesnt like to start when its cold...its a 2001 chevy silverado 2500....when i turn the key i have to hold my foot on the gas and the brake and rev it alot and keep it at 1000 RPM to keep it alive and also to shift and when i slow down or get under 500 RPM it dies...what could cause this?? it also sometimes doesnt start when its warm every once in awhile but when it does it atleast idles...but in the cold it doesnt even idle....ideas!?
10-09-2009, 06:07 PM
#2
Fork Horn
Join Date: Sep 2005
Location: Blacksburg, SC
Posts: 129
i take its a gasoline model ?.. check engine light on ?
If check engine light is on , have someone read the code on it , sensors will show up here , although often it's a mis communication / reading from one of the sensors which don't always show up as a code in the ecm , in other words more likely then not your fuel/air ratio is getting screwed up , which mean that eitehr a part of the fuel injection system is clogged or the MAF sensor isn't reading accurately making the ECM adjust the injection timing wrong and creating a wrong air/fuel mixture.
Lucas injection cleaner is great , and it's the least expensive of the options , you can also take the maf sensor and clean it , over time the sensor get's dirty and won't read correct.the reason you see it stalling is because at a low RPM the fuel/air ratio is much more critical to keep the engine running , at higher RPMs the flywheel and the rotating masss will keep the engine going even if the ratio is off
If check engine light is on , have someone read the code on it , sensors will show up here , although often it's a mis communication / reading from one of the sensors which don't always show up as a code in the ecm , in other words more likely then not your fuel/air ratio is getting screwed up , which mean that eitehr a part of the fuel injection system is clogged or the MAF sensor isn't reading accurately making the ECM adjust the injection timing wrong and creating a wrong air/fuel mixture.
Lucas injection cleaner is great , and it's the least expensive of the options , you can also take the maf sensor and clean it , over time the sensor get's dirty and won't read correct.the reason you see it stalling is because at a low RPM the fuel/air ratio is much more critical to keep the engine running , at higher RPMs the flywheel and the rotating masss will keep the engine going even if the ratio is off
Last edited by SyPTo; 10-09-2009 at 06:17 PM. Reason: adding stuff
10-09-2009, 06:20 PM
#5
Fork Horn
Join Date: Sep 2005
Location: Blacksburg, SC
Posts: 129
btw you can also unplug the MAF sensor and see if it still does it...thats the sensor/meter thats right behind the airfilter.
Last edited by SyPTo; 10-09-2009 at 06:23 PM.
10-09-2009, 06:25 PM
#6
Fork Horn
Join Date: Aug 2005
Location: Wyandotte,Oklahoma
Posts: 259
Try changing the fuel filter, and the air filter.
Simple fixes but it might make the difference.
Also, like the other poster said some fuel line cleaner
after the other two could help clogged injectors.
Simple fixes but it might make the difference.
Also, like the other poster said some fuel line cleaner
after the other two could help clogged injectors.
10-09-2009, 06:32 PM
#7
Nontypical Buck
Join Date: Feb 2003
Location: Garfield NJ USA
Posts: 3,067
that only works if the check engine light is on , or has been on , then there would be a residual code in there..miss readings will not show up in the ECM cause it's not a faulty sensor causing it.
btw you can also unplug the MAF sensor and see if it still does it...thats the sensor/meter thats right behind the airfilter.
btw you can also unplug the MAF sensor and see if it still does it...thats the sensor/meter thats right behind the airfilter.
10-09-2009, 08:26 PM
#8
Giant Nontypical
Join Date: Jan 2008
Location: IL
Posts: 6,575
I recall reading the story behind "amsoil" ie synthetic motor oil, and it said something to the affect of easier starting/smoothing running in the cold etc..
perhaps running a synthetic or lower weight oil would help ya out on those colder days.
could be alot of things though...
perhaps running a synthetic or lower weight oil would help ya out on those colder days.
could be alot of things though...
10-10-2009, 08:19 AM
#10
Giant Nontypical
Join Date: Feb 2003
Location: Darien, IL
Posts: 6,744
Of course make sure it is in good shape maintenance wise. Plugs, wires, dist. cap (if it has one), rotor (if it has one), air & fuel filters, PCV valve, etc.
But if I had to give it a straight out guess I would say throttle position sensor. Probobly about 50 bucks.
But I wouldn't do a thing until getting some sort of word from mastevt.
But if I had to give it a straight out guess I would say throttle position sensor. Probobly about 50 bucks.
But I wouldn't do a thing until getting some sort of word from mastevt.
