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Next: GM selling Truck bizz
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External
Since: Dec 04, 2007
Posts: 7
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(Msg. 1) Posted: Sun Dec 30, 2007 10:57 pm
Post subject: 2003 s-10 Code P0303
Archived from groups: alt>trucks>chevy (more info?)
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2003 s-10 v6 4.3, Code P0303 Cyl 3 Misfire.
Pulling hard up hill , get flashing Check engine light ,Type 2 (Hard on the
CAT)
Light clears, but code still there. Noticed for the last week, I get hard
restarts, after about 20 minutes, of stopping. ( Cranks longer to start),
as compare
to 1/2 second after 1 minute. If i turn the ignition key to " On" for a
second,
then off, then crank,,the engine fires immediately,(as if I'm priming the
fuel system).
I think I might have a leaking injector, or bad check valve in the fuel
pump, or
maybe a bad fuel filter. I am trying injector cleaner first. I also
remember Chevy
having trouble ,with sticky injectors a few years back...also I don't feel
any drop in performance
while this is going on.
I have 83,000 miles, on the truck, and I replaced the plugs, AC Delco
Plats,at 41,000, the truck
is still like new. Filter at 31,000. Thank you for reading this! |
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External
Since: Nov 21, 2007
Posts: 43
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(Msg. 2) Posted: Sun Dec 30, 2007 10:57 pm
Post subject: Re: 2003 s-10 Code P0303 [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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well, your plugs and filter are due......
"Bumpy" <acforn.DeleteThis@att.net> wrote in message
news:luYdj.348963$kj1.276166@bgtnsc04-news.ops.worldnet.att.net...
> 2003 s-10 v6 4.3, Code P0303 Cyl 3 Misfire.
>
> Pulling hard up hill , get flashing Check engine light ,Type 2 (Hard on
> the CAT)
>
> Light clears, but code still there. Noticed for the last week, I get hard
> restarts, after about 20 minutes, of stopping. ( Cranks longer to start),
> as compare
> to 1/2 second after 1 minute. If i turn the ignition key to " On" for a
> second,
> then off, then crank,,the engine fires immediately,(as if I'm priming the
> fuel system).
>
> I think I might have a leaking injector, or bad check valve in the fuel
> pump, or
> maybe a bad fuel filter. I am trying injector cleaner first. I also
> remember Chevy
> having trouble ,with sticky injectors a few years back...also I don't feel
> any drop in performance
> while this is going on.
>
> I have 83,000 miles, on the truck, and I replaced the plugs, AC Delco
> Plats,at 41,000, the truck
> is still like new. Filter at 31,000. Thank you for reading this!
> |
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External
Since: Nov 02, 2007
Posts: 42
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(Msg. 3) Posted: Mon Dec 31, 2007 4:04 am
Post subject: Re: 2003 s-10 Code P0303 [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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Is there any arcing when looking at the engine bay in darkness (engine
running obviously). It could be as simple as a bad coil or wire shorting to
the block, etc. You may want to try swapping two wires to see if the
problem moves to another cylinder. How does the fuel pressure test at the
rail??
Thanks,
Andrew.
On 12/30/07 9:29 PM, in article
luYdj.348963$kj1.276166@bgtnsc04-news.ops.worldnet.att.net, "Bumpy"
<acforn.RemoveThis@att.net> wrote:
> 2003 s-10 v6 4.3, Code P0303 Cyl 3 Misfire.
>
> Pulling hard up hill , get flashing Check engine light ,Type 2 (Hard on the
> CAT)
>
> Light clears, but code still there. Noticed for the last week, I get hard
> restarts, after about 20 minutes, of stopping. ( Cranks longer to start),
> as compare
> to 1/2 second after 1 minute. If i turn the ignition key to " On" for a
> second,
> then off, then crank,,the engine fires immediately,(as if I'm priming the
> fuel system).
>
> I think I might have a leaking injector, or bad check valve in the fuel
> pump, or
> maybe a bad fuel filter. I am trying injector cleaner first. I also
> remember Chevy
> having trouble ,with sticky injectors a few years back...also I don't feel
> any drop in performance
> while this is going on.
>
> I have 83,000 miles, on the truck, and I replaced the plugs, AC Delco
> Plats,at 41,000, the truck
> is still like new. Filter at 31,000. Thank you for reading this!
>
> >> Stay informed about: 2003 s-10 Code P0303 |
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External
Since: Oct 30, 2007
Posts: 182
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(Msg. 4) Posted: Mon Dec 31, 2007 10:10 am
Post subject: Re: 2003 s-10 Code P0303 [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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Bumpy wrote:
> 2003 s-10 v6 4.3, Code P0303 Cyl 3 Misfire.
>
> Pulling hard up hill , get flashing Check engine light ,Type 2 (Hard on the
> CAT)
>
> Light clears, but code still there. Noticed for the last week, I get hard
> restarts, after about 20 minutes, of stopping. ( Cranks longer to start),
> as compare
> to 1/2 second after 1 minute. If i turn the ignition key to " On" for a
> second,
> then off, then crank,,the engine fires immediately,(as if I'm priming the
> fuel system).
>
> I think I might have a leaking injector, or bad check valve in the fuel
> pump, or
> maybe a bad fuel filter. I am trying injector cleaner first. I also
> remember Chevy
> having trouble ,with sticky injectors a few years back...also I don't feel
> any drop in performance
> while this is going on.
>
> I have 83,000 miles, on the truck, and I replaced the plugs, AC Delco
> Plats,at 41,000, the truck
> is still like new. Filter at 31,000. Thank you for reading this!
>
>
Sounds like you have a sticky poppet valve on #3. Try running a can of
SeaFoam cleaner through it. You might also want to run a pressure test
on the fuel system. You will see the pressure drop fast with the key off
if the injector is leaking down.
--
Steve W.
Near Cooperstown, New York
Life is not like a box of chocolates
it's more like a jar of jalapenos-
what you do today could burn your ass tomorrow! >> Stay informed about: 2003 s-10 Code P0303 |
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External
Since: Nov 02, 2007
Posts: 42
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(Msg. 5) Posted: Mon Dec 31, 2007 4:32 pm
Post subject: Re: 2003 s-10 Code P0303 [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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Steve,
Did GM still use that poppet design in 2003? I don't feel so bad for my 95
now if that's the case. It seems like the design needlessly overpressurized
the fuel system to open to the poppet style injector. I thought they moved
away to actual injectors but I've learned that you certainly know your stuff
when it comes to these motors.
Thanks,
Andrew.
On 12/31/07 10:10 AM, in article flb0ph$2ml$1@aioe.org, "Steve W."
<csr684NOT DeleteThis @yahoo.com> wrote:
> Bumpy wrote:
>> 2003 s-10 v6 4.3, Code P0303 Cyl 3 Misfire.
>>
>> Pulling hard up hill , get flashing Check engine light ,Type 2 (Hard on the
>> CAT)
>>
>> Light clears, but code still there. Noticed for the last week, I get hard
>> restarts, after about 20 minutes, of stopping. ( Cranks longer to start),
>> as compare
>> to 1/2 second after 1 minute. If i turn the ignition key to " On" for a
>> second,
>> then off, then crank,,the engine fires immediately,(as if I'm priming the
>> fuel system).
>>
>> I think I might have a leaking injector, or bad check valve in the fuel
>> pump, or
>> maybe a bad fuel filter. I am trying injector cleaner first. I also
>> remember Chevy
>> having trouble ,with sticky injectors a few years back...also I don't feel
>> any drop in performance
>> while this is going on.
>>
>> I have 83,000 miles, on the truck, and I replaced the plugs, AC Delco
>> Plats,at 41,000, the truck
>> is still like new. Filter at 31,000. Thank you for reading this!
>>
>>
>
> Sounds like you have a sticky poppet valve on #3. Try running a can of
> SeaFoam cleaner through it. You might also want to run a pressure test
> on the fuel system. You will see the pressure drop fast with the key off
> if the injector is leaking down. >> Stay informed about: 2003 s-10 Code P0303 |
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External
Since: Oct 30, 2007
Posts: 182
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(Msg. 6) Posted: Mon Dec 31, 2007 5:06 pm
Post subject: Re: 2003 s-10 Code P0303 [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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AWN wrote:
> Steve,
>
> Did GM still use that poppet design in 2003? I don't feel so bad for my 95
> now if that's the case. It seems like the design needlessly overpressurized
> the fuel system to open to the poppet style injector. I thought they moved
> away to actual injectors but I've learned that you certainly know your stuff
> when it comes to these motors.
>
> Thanks,
> Andrew.
They used a remote injector with a poppet valve on the intake end. Not
the spider style CPI like the earlier engines.
Basically you have 4 versions of 4.3 in use.
First they were carbed, next came the TBI, then the early style CPI,
then the later style SCPI. The last version used an independent firing
injector (basically an electronic version of a poppet valve) but was
still fed from a central regulator block. There are kits that allow you
to convert the earlier units to the latest design.
--
Steve W.
Near Cooperstown, New York >> Stay informed about: 2003 s-10 Code P0303 |
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External
Since: Dec 04, 2007
Posts: 7
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(Msg. 7) Posted: Mon Dec 31, 2007 8:57 pm
Post subject: Re: 2003 s-10 Code P0303 [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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"Bumpy" <acforn.RemoveThis@att.net> wrote in message
news:luYdj.348963$kj1.276166@bgtnsc04-news.ops.worldnet.att.net...
> 2003 s-10 v6 4.3, Code P0303 Cyl 3 Misfire.
>
> Pulling hard up hill , get flashing Check engine light ,Type 2 (Hard on
> the CAT)
>
> Light clears, but code still there. Noticed for the last week, I get hard
> restarts, after about 20 minutes, of stopping. ( Cranks longer to start),
> as compare
> to 1/2 second after 1 minute. If i turn the ignition key to " On" for a
> second,
> then off, then crank,,the engine fires immediately,(as if I'm priming the
> fuel system).
>
> I think I might have a leaking injector, or bad check valve in the fuel
> pump, or
> maybe a bad fuel filter. I am trying injector cleaner first. I also
> remember Chevy
> having trouble ,with sticky injectors a few years back...also I don't feel
> any drop in performance
> while this is going on.
>
> I have 83,000 miles, on the truck, and I replaced the plugs, AC Delco
> Plats,at 41,000, the truck
> is still like new. Filter at 31,000. Thank you for reading this!
Thanks Steve, The weather has been bad here, and I have not been able to
get out and work on it. I put some Chervon Techron or whatever they call it.
but it does not help..Ill try the seafoam. It just seems as though its an
injector.
Is the pressure tap the same size as a tire valve? I had a 93 blazer, but I
don't
remember the size, at the time. Thanks again, Steve >> Stay informed about: 2003 s-10 Code P0303 |
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External
Since: Oct 30, 2007
Posts: 182
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(Msg. 8) Posted: Tue Jan 01, 2008 9:22 am
Post subject: Re: 2003 s-10 Code P0303 [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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Bumpy wrote:
> "Bumpy" <acforn.DeleteThis@att.net> wrote in message
> news:luYdj.348963$kj1.276166@bgtnsc04-news.ops.worldnet.att.net...
>> 2003 s-10 v6 4.3, Code P0303 Cyl 3 Misfire.
>>
>> Pulling hard up hill , get flashing Check engine light ,Type 2 (Hard on
>> the CAT)
>>
>> Light clears, but code still there. Noticed for the last week, I get hard
>> restarts, after about 20 minutes, of stopping. ( Cranks longer to start),
>> as compare
>> to 1/2 second after 1 minute. If i turn the ignition key to " On" for a
>> second,
>> then off, then crank,,the engine fires immediately,(as if I'm priming the
>> fuel system).
>>
>> I think I might have a leaking injector, or bad check valve in the fuel
>> pump, or
>> maybe a bad fuel filter. I am trying injector cleaner first. I also
>> remember Chevy
>> having trouble ,with sticky injectors a few years back...also I don't feel
>> any drop in performance
>> while this is going on.
>>
>> I have 83,000 miles, on the truck, and I replaced the plugs, AC Delco
>> Plats,at 41,000, the truck
>> is still like new. Filter at 31,000. Thank you for reading this!
>
>
>
> Thanks Steve, The weather has been bad here, and I have not been able to
> get out and work on it. I put some Chervon Techron or whatever they call it.
> but it does not help..Ill try the seafoam. It just seems as though its an
> injector.
>
> Is the pressure tap the same size as a tire valve? I had a 93 blazer, but I
> don't
> remember the size, at the time. Thanks again, Steve
>
>
Not the same size valve. You can probably borrow the proper gauge from
auto zone or advance.
--
Steve W.
Near Cooperstown, New York
Life is not like a box of chocolates
it's more like a jar of jalapenos-
what you do today could burn your ass tomorrow! >> Stay informed about: 2003 s-10 Code P0303 |
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