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Cold Start Problem - Lost 1 - 1.5 MPGS

  
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Jre1229

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Since: Dec 08, 2005
Posts: 7



(Msg. 1) Posted: Mon Feb 20, 2006 3:53 pm
Post subject: Cold Start Problem - Lost 1 - 1.5 MPGS
Archived from groups: alt>trucks>chevy (more info?)
Hi,
I posted this a while back but came upon a new discovery. I had posted
earlier that my truck seems to run rough when I start it in the
mornings. Its a 2002 Chevy Z71. 327 Engine. 60K miles. It didn't start
doing this until it got cold out side. When I start it, it idles up and
then when it idles back down it sputters. It doesn't quit. It threw an
error code and I had it checked and it just said "Random Misfire" Once
it warms up a bit it stops doing this. Also if I let it sit for a few
hours and cool back off it doesn't do it. It only seems to do this when
I let it sit overnight. I tried replacing the fuel filter, put gas
treatment in it and replace a sensor on the side of the block. I can't
remember the name of the senor but I believe it was IAC or something
like that. I know it checks the temp of the block. The new discovery I
made the other day was that it has lost mpg. I used to get around 15
during my usual driving. Now it get a little over 13.5. Any ideas would
be greatly appreciated.
Thanks
Josh

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sweaver




Joined: Feb 06, 2006
Posts: 23



(Msg. 2) Posted: Mon Feb 20, 2006 9:42 pm
Post subject: Re: Cold Start Problem - Lost 1 - 1.5 MPGS [Login to view extended thread Info.]
Hi,
The problem with the running rough when cold and the random misfire(CODE PO300) is the fuel injectors are sticking when cold.This is a very common problem with this vehicle. You need to have a high pressure
fuel injection cleaning done , the additive in the fuel tank will help to prevent this from happining again but the cleaning needs to be done first. The loss of fuel mileage is probably related,but get the injectors taken care of first and see where you are at from there.Good luck !
If you ever need expert help with your truck go to yourautoadvisor.com
they can help!!!!

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Whitelightning

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Since: Aug 11, 2004
Posts: 681



(Msg. 3) Posted: Mon Feb 20, 2006 9:55 pm
Post subject: Re: Cold Start Problem - Lost 1 - 1.5 MPGS [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
"Jre1229" <josh.enochs RemoveThis @gmail.com> wrote in message
news:1140479601.985937.293900@g14g2000cwa.googlegroups.com...
> Hi,
> I posted this a while back but came upon a new discovery. I had posted
> earlier that my truck seems to run rough when I start it in the
> mornings. Its a 2002 Chevy Z71. 327 Engine. 60K miles. It didn't start
> doing this until it got cold out side. When I start it, it idles up and
> then when it idles back down it sputters. It doesn't quit. It threw an
> error code and I had it checked and it just said "Random Misfire" Once
> it warms up a bit it stops doing this. Also if I let it sit for a few
> hours and cool back off it doesn't do it. It only seems to do this when
> I let it sit overnight. I tried replacing the fuel filter, put gas
> treatment in it and replace a sensor on the side of the block. I can't
> remember the name of the senor but I believe it was IAC or something
> like that. I know it checks the temp of the block. The new discovery I
> made the other day was that it has lost mpg. I used to get around 15
> during my usual driving. Now it get a little over 13.5. Any ideas would
> be greatly appreciated.
> Thanks
> Josh

Yeah gasoline you buy at the pump when its 80 degrees outside, is not the
same gasoline you buy when its 32 degrees every where in the country. And
the winter grade delivers less mileage. Your drop is about in line with
what others have reported.
IAC is Idle Air Control Valve and its located on the throttle assembly if
you vehicle has one.
Temperature sensor measures block temperature, located in intake manifold.
Only sensors I know on the side of an engine, knock sensors, and some
vehicles have a crank sensor.
For the sputter/miss I would be looking at plug wires and or plugs
Whitelightning
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Jre1229

External


Since: Dec 08, 2005
Posts: 7



(Msg. 4) Posted: Tue Feb 21, 2006 2:10 pm
Post subject: Re: Cold Start Problem - Lost 1 - 1.5 MPGS [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
Could this cause it to only do it when it sits overnight? Also, I
noticed in the manual it said to replace plugs and wires after 100k
miles. It only has 60K. Is that very common.
Thanks for the feedback.
Whitelightning wrote:
> "Jre1229" <josh.enochs.DeleteThis@gmail.com> wrote in message
> news:1140479601.985937.293900@g14g2000cwa.googlegroups.com...
> > Hi,
> > I posted this a while back but came upon a new discovery. I had posted
> > earlier that my truck seems to run rough when I start it in the
> > mornings. Its a 2002 Chevy Z71. 327 Engine. 60K miles. It didn't start
> > doing this until it got cold out side. When I start it, it idles up and
> > then when it idles back down it sputters. It doesn't quit. It threw an
> > error code and I had it checked and it just said "Random Misfire" Once
> > it warms up a bit it stops doing this. Also if I let it sit for a few
> > hours and cool back off it doesn't do it. It only seems to do this when
> > I let it sit overnight. I tried replacing the fuel filter, put gas
> > treatment in it and replace a sensor on the side of the block. I can't
> > remember the name of the senor but I believe it was IAC or something
> > like that. I know it checks the temp of the block. The new discovery I
> > made the other day was that it has lost mpg. I used to get around 15
> > during my usual driving. Now it get a little over 13.5. Any ideas would
> > be greatly appreciated.
> > Thanks
> > Josh
>
> Yeah gasoline you buy at the pump when its 80 degrees outside, is not the
> same gasoline you buy when its 32 degrees every where in the country. And
> the winter grade delivers less mileage. Your drop is about in line with
> what others have reported.
> IAC is Idle Air Control Valve and its located on the throttle assembly if
> you vehicle has one.
> Temperature sensor measures block temperature, located in intake manifold.
> Only sensors I know on the side of an engine, knock sensors, and some
> vehicles have a crank sensor.
> For the sputter/miss I would be looking at plug wires and or plugs
> Whitelightning
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sweaver




Joined: Feb 06, 2006
Posts: 23



(Msg. 5) Posted: Tue Feb 21, 2006 7:12 pm
Post subject: Re: Cold Start Problem - Lost 1 - 1.5 MPGS [Login to view extended thread Info.]
The injectors are STICKING when cold !!!!!!!!!! trust me on this when they warm up they unstick themselves--spend the money on a good high pressure flush before you go changing plugs and wires-you are wasting your money on that .
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ShoeSaleman

External


Since: Oct 30, 2005
Posts: 44



(Msg. 6) Posted: Wed Feb 22, 2006 12:55 pm
Post subject: Re: Cold Start Problem - Lost 1 - 1.5 MPGS [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
Jre1229 wrote:
> Could this cause it to only do it when it sits overnight? Also, I
> noticed in the manual it said to replace plugs and wires after 100k
> miles. It only has 60K. Is that very common.
> Thanks for the feedback.
> Whitelightning wrote:

60k is pushing it, dont wait till 100. Tune it up then see if you still
have the cold start problem. Don't forget the fuel filter.







>>"Jre1229" <josh.enochs RemoveThis @gmail.com> wrote in message
>>news:1140479601.985937.293900@g14g2000cwa.googlegroups.com...
>>
>>>Hi,
>>>I posted this a while back but came upon a new discovery. I had posted
>>>earlier that my truck seems to run rough when I start it in the
>>>mornings. Its a 2002 Chevy Z71. 327 Engine. 60K miles. It didn't start
>>>doing this until it got cold out side. When I start it, it idles up and
>>>then when it idles back down it sputters. It doesn't quit. It threw an
>>>error code and I had it checked and it just said "Random Misfire" Once
>>>it warms up a bit it stops doing this. Also if I let it sit for a few
>>>hours and cool back off it doesn't do it. It only seems to do this when
>>>I let it sit overnight. I tried replacing the fuel filter, put gas
>>>treatment in it and replace a sensor on the side of the block. I can't
>>>remember the name of the senor but I believe it was IAC or something
>>>like that. I know it checks the temp of the block. The new discovery I
>>>made the other day was that it has lost mpg. I used to get around 15
>>>during my usual driving. Now it get a little over 13.5. Any ideas would
>>>be greatly appreciated.
>>>Thanks
>>>Josh
>>
>>Yeah gasoline you buy at the pump when its 80 degrees outside, is not the
>>same gasoline you buy when its 32 degrees every where in the country. And
>>the winter grade delivers less mileage. Your drop is about in line with
>>what others have reported.
>>IAC is Idle Air Control Valve and its located on the throttle assembly if
>>you vehicle has one.
>>Temperature sensor measures block temperature, located in intake manifold.
>>Only sensors I know on the side of an engine, knock sensors, and some
>>vehicles have a crank sensor.
>>For the sputter/miss I would be looking at plug wires and or plugs
>>Whitelightning
>
>
 >> Stay informed about: Cold Start Problem - Lost 1 - 1.5 MPGS 
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