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Old 09-30-2013, 12:20 AM   #31
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99 Chevy Astro Misfire runs rough code P0301


Something else I just thought of. You can get some sort of cleaner for your fuel injection, which you just introduce into the intake system somehow. It has been years since I did that, but it helped. Might be worth a try. Mine was a 4.3 as well.

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Old 10-09-2013, 12:39 AM   #32
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99 Chevy Astro Misfire runs rough code P0301


Update as I stated all summer no check engine light. I was up north for ten days, it got down to 48 degrees and I got a check engine light. I drove 50 miles back to the property and parked it. On the way home I hit 68 degrees about a 100 miles from the property and the check engine light went off and stayed off 250 miles home.
I will scan it in the morning and post the code.
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Old 10-09-2013, 11:11 AM   #33
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99 Chevy Astro Misfire runs rough code P0301


P0301 misfire number one cylinder!
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Old 10-09-2013, 11:14 AM   #34
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99 Chevy Astro Misfire runs rough code P0301


Good chance it's the injector sticking. They are very common to get carboned up and stick more so cold.
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Old 10-09-2013, 02:15 PM   #35
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99 Chevy Astro Misfire runs rough code P0301


I just hate to pull the top and replace the spider assembly and have the same problem. I ran a few cans of GM heavy duty fuel injector cleaner thru it. Did not improve it though. I have looked into purchasing the equipment to inject thru the fuel rail. I will call around and see who does the injector cleaner and cost?
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Old 10-09-2013, 02:23 PM   #36
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99 Chevy Astro Misfire runs rough code P0301


Don't expect to much on the flush it's not a guarantee. In almost 20 years of working on cars I'm at probably 40% of flushing injectors fixing anything
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Old 10-09-2013, 11:45 PM   #37
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99 Chevy Astro Misfire runs rough code P0301


Quote:
Originally Posted by cjm94 View Post
Don't expect to much on the flush it's not a guarantee. In almost 20 years of working on cars I'm at probably 40% of flushing injectors fixing anything
I pretty much concur on the flushing.
I don't have a garage and this is my main ride.
I like working on cars, just don't like to be rushed.
It being van with engine cover makes it a little more involved.
Not going to take it in anymore, they charge too much and mess something else up. Like when they replace the fuel pump and dropped the tank without disconnecting the filler neck. Damaged the OEM cap and trim around the fill neck. "Oh we did not do that because we did not disconnect it" "All we did was lower the tank." really?

I will keep ya updated from time to time!
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Old 10-29-2013, 11:35 AM   #38
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99 Chevy Astro Misfire runs rough code P0301


Did you manage to fix it?
Just wondering whether putting some Super Unleaded is going to help the car. After all, they got some of the injector cleaning stuff, too.
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Old 10-30-2013, 12:00 AM   #39
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99 Chevy Astro Misfire runs rough code P0301


Quote:
Originally Posted by Hardway View Post
I pretty much concur on the flushing.
I don't have a garage and this is my main ride.
I like working on cars, just don't like to be rushed.
It being van with engine cover makes it a little more involved.
Not going to take it in anymore, they charge too much and mess something else up. Like when they replace the fuel pump and dropped the tank without disconnecting the filler neck. Damaged the OEM cap and trim around the fill neck. "Oh we did not do that because we did not disconnect it" "All we did was lower the tank." really?

I will keep ya updated from time to time!
Astrovans get the hose disconnected from the neck at the tank, it won't come out otherwise. If you don't have the updated injector assembly, it's a good investment if you are keeping the van. Possible sticking valve though...if the misfire happens under load or at high speed, it's something to consider.
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Old 11-17-2013, 10:57 PM   #40
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99 Chevy Astro Misfire runs rough code P0301


I was thinking weak valve spring as well. You could try running a half quart synthetic oil on the next change. If the filler neck is leaking might trying running some Heet through it.
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Old 11-27-2013, 09:16 PM   #41
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99 Chevy Astro Misfire runs rough code P0301


Mid October, I did a full tune up my self AC Delco parts.
coil, cap, rotor,plugs, wires.
Cleared all codes and did not recieve anymore codes.
Still rough idle in drive stopped at a light.
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Old 03-02-2014, 05:08 PM   #42
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99 Chevy Astro Misfire runs rough code P0301


So far no codes!
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Old 03-02-2014, 10:10 PM   #43
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99 Chevy Astro Misfire runs rough code P0301


Quote:
Originally Posted by Hardway View Post
Still rough idle in drive stopped at a light.
these 4.3's are not the smoothest idlers. but a clogged egr will make em idle really bad, and is a common problem.
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Old 07-08-2014, 08:34 AM   #44
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99 Chevy Astro Misfire runs rough code P0301


I had a 1998 Blazer with the 4.3, the truck had 175k, and when running it would feel like a misfire. I found the distributor gear had worn out to the point that many of the teeth had 1/16" of wear on them. I know of one other person who had this same problem. It causes your timing to shift, and can cause a misfire.
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Old 07-08-2014, 08:45 AM   #45
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99 Chevy Astro Misfire runs rough code P0301


Just read the last page of it. Glad you don't have anymore codes. A rough idle could be a vacuum leak, clogged injector..something like that.. I wouldnt think itd be a worn distributor gear unless you were having the stumble all the time. Have you replaced your fuel filter?

Also, double check your plugs. I'm betting they'll show a lean condition, but I'm not good with fuel injection..So I could be wrong

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