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Chevy Blazer LT Vortec random misfire

7 messages,  Last post on Jan 15, 2011 at 7:33 AM

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#1 of 7 95 LT Vortec random misfire by paulh6

Jul 11, 2010 (6:35 am)

Hot or cold, most of the time it misfires, sometimes it actually drives smooth. I even went on a day trip to another town. It drove smooth the whole time! Usually, though, the opposite is true.
This has been an ongoing problem. New cap, wires, plugs, EGR, TPS. _lots_ of fuel system cleaner, and none of these things have solved the problem.
If I punch it, it will get up and go. (It seems to do just great~ that's why I was hoping the TPS was to blame...)
It's when I drive "normal" that it acts up.
Ideas?

#2 of 7 vortec misfire by thesandman7

Sep 17, 2010 (11:57 am)

i had a similar problem some years back with my 2000 Blzaer. replaced the same items and even went as far as reploacing the distributor assy. turns out that i was getting moisture inside the cap from a crack in it. check ur distributor for cracks or make sure the seal is good on the cap/distributor

#3 of 7 Re: vortec misfire [thesandman7] by jlflemmons

Sep 17, 2010 (3:59 pm)

Replying to: thesandman7 (Sep 17, 2010 11:57 am)
When you changed the wires, did you also change the coil to distributor wire? The routing of this wire takes it against a metal bracket, and can damage the insulation causing a misfire.

#4 of 7 Re: Same Problem by punshka

Jan 15, 2011 (3:35 am)

Good Morning,
 
We are seeming to have some of the same problems as you've listed above. If you wouldn't mind taking a look at what we've posted this far, to get somewhat, of an idea of what we're talking about, that would be great. We're looking for some ideas on the issue that is at hand. Please let me know if you've got any suggestions on this issue.
 
Thank you.

#5 of 7 Good Morning by punshka

Jan 15, 2011 (7:20 am)

It's about 9:20am here and it seems that everyone has fallen asleep. If anyone has any kind of feedback to our issue at hand, please feel free to let me know. Thank you everyone for all of your help and efforts. We'll talk soon.

#6 of 7 Re: Same Problem [punshka] by paulh6

Jan 15, 2011 (7:24 am)

Replying to: punshka (Jan 15, 2011 3:35 am)
Here's the thing. Since it has become MUCH colder here, the problem has all but vanished. Ideas?
I chalk it up to being a self healing Chevy, but I'm sure there is a much better, mechanical or electrical explanation.
I hope this will help pinpoint whatever was making it act like it had "pondwater" for fuel.
Oh~ I also quit using WalMart's fuel. Related?
I only bring this up, because I used to drive 60 miles per day, and that is where I would get my gas. (plain unleaded) Then when I got my new job here in town, it sat for months. As I would only drive it now and then, it would have taken a long time to remove the deposits that cheap fuel would leave behind.
 
Just grasping at straws here...

#7 of 7 PaulH6 by punshka

Jan 15, 2011 (7:33 am)

Thanks for the update. I will let you guys know by this afternoon.

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