sputtering hesitating when it is humid moisture

sputtering hesitating when it is humid moisture

Postby Perry [OP] » April 11th 2013, 4:32pm

I am having an issue with my Astro van sputtering hesitating when it is humid moisture or raining. I get a PO300 DTC code (Random misfire)
It idles fine and only sputters when I step on the accelerator.
I brought it to a shop and they told me in a roundabout way they could start replacing things and see what happens or wait until it dies all the way. None of these are prudent choices in my opinion. So I was hoping that someone else has had this same problem and as a better idea what it might be. Thank you. Perry
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Re: sputtering hesitating when it is humid moisture

Postby markmitch » April 11th 2013, 5:45pm

it may be a EGR valve , I once had a buick that did that till I replaced it.
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Re: sputtering hesitating when it is humid moisture

Postby icebrrg3rd » April 11th 2013, 7:46pm

Usually when it is moist/humid/raining/damp and you have a misfire, it points right to the ignition system. Common culprits are either the distributor cap is cracked/bad or the plug wires are arcing. It's a common complaint here. If those are good then the coil would be next on the list.

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Re: sputtering hesitating when it is humid moisture

Postby binder » April 12th 2013, 12:55am

Three things I would check/change are coil, Distributor cap and rotor and possibly ignition Control Module. Spend the extra few bucks and get the AC Dleco parts, most of the time, they tend to last longer.

What will probably happen if you dont change them, is that it will become harder to start in time.

But 99% of the time moisture related problems are ignition related
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Re: sputtering hesitating when it is humid moisture

Postby Jasen » April 12th 2013, 1:10am

PO300 can be a PITA, don't ask how I know.
1st. place I'd look is cap&rotor for corrosion, crack's & clogged dist. vent screen's. ACDeleco really is the only way to go on these van's. Also check the rubber splash guard's in the front wheel wells aren't missing or folded up. Next unplug all your ignition & emission elec. plugs (1 @ a time), squirt them w/ WD40, blast them out with compressed air, remove rubber seal & clean them and plug body, apply dielectric grease to seal to insure a water tight seal and plug them back in.
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Re: sputtering hesitating when it is humid moisture

Postby WoodButcher » April 12th 2013, 2:03am

Jasen wrote:PO300 can be a PITA, don't ask how I know.
1st. place I'd look is cap&rotor for corrosion, crack's & clogged dist. vent screen's. ACDeleco really is the only way to go on these van's. Also check the rubber splash guard's in the front wheel wells aren't missing or folded up. Next unplug all your ignition & emission elec. plugs (1 @ a time), squirt them w/ WD40, blast them out with compressed air, remove rubber seal & clean them and plug body, apply dielectric grease to seal to insure a water tight seal and plug them back in.



x2, Start with the cap and rotor, AC Delco only. If you change the wires get a high quality 8mm set, plugs, stay away from splitfire and bullpuckies like that. AC Delco are good. It helps alloy to have help when you do the wires but the rest is easy. The doghouse is the biggest PITA in my book but I've gotten good at that, with luck you won't need to.
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Re: sputtering hesitating when it is humid moisture

Postby Perry [OP] » April 12th 2013, 3:55am

Thank you all for the great advice. :) I need to find a day to change the bearing hubs so I will have the rubber off and can look at the plugs too. Never had the dog house off but if it is anything like my c7500 probably will be one of those days where a lot of strange yelling comes from the inside of the van :)
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Re: sputtering hesitating when it is humid moisture

Postby djwarren312616 » April 12th 2013, 4:32am

Big Yes on the ACDELCO parts all the way. I had sputtering at all speeds and particularly noticable above 70mph. Changed plugs, wires, cap & rotor and she runs smooth as silk now. For the doghouse and the plugs I would buy yourself a long extension (12in+) spark plug socket and then if your really up to it, buy a bit for a drill (mines 18v Dewalt) to mate to the extension, makes the doghouse much easier. Also easier to get most the plugs from the side behind the tires with the extension.
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Re: sputtering hesitating when it is humid moisture

Postby Jasen » April 12th 2013, 4:34am

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Re: sputtering hesitating when it is humid moisture

Postby binder » April 12th 2013, 2:05pm

Taking off the doghouse is not really that bad, sure it adds another 30-40 mins to almost any job, but if you are replacing ignition components in the winter, at least you have some protection from the elements. Spark plugs take way too long to change on this van, especially the last two on the drivers side.

I often wonder, is this vehicle is a marvel of engineering, how they got everything to fit into the small spaces provided, using up common components. Or if it is an engineering nightmare, thought up by some drunken GM engineers, trying to use up as much **** old inventory as possible, with out giving a single thought to anyone having to perform repairs or logical placement of components?

I usually tend to think it is the latter.
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Re: sputtering hesitating when it is humid moisture

Postby Perry [OP] » April 12th 2013, 2:28pm

Yes I agree, it is most likely the later I replaced the window regulators and the power door lock actuators last year. Turns out they are the same parts from the Firebird/Camaro line
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Re: sputtering hesitating when it is humid moisture

Postby Jasen » April 13th 2013, 12:42am

binder wrote:Taking off the doghouse is not really that bad, sure it adds another 30-40 mins to almost any job, but if you are replacing ignition components in the winter, at least you have some protection from the elements. Spark plugs take way too long to change on this van, especially the last two on the drivers side.

I often wonder, is this vehicle is a marvel of engineering, how they got everything to fit into the small spaces provided, using up common components. Or if it is an engineering nightmare, thought up by some drunken GM engineers, trying to use up as much **** old inventory as possible, with out giving a single thought to anyone having to perform repairs or logical placement of components?

I usually tend to think it is the latter.


Look at the newer F250's and up, you have to pull the cab to anything more then check the coolant level.
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