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83 chevy blazer back firing


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djbumman
Novice

Aug 6, 2010, 1:51 PM

Post #1 of 11 (1856 views)
83 chevy blazer back firing Sign In

i put headers on my 83 chevy blazer 305, and when my brother in law took out the spark plug wires, he didnt label them. now the engine runs rough,and back fires, and also wont stay running. im wondering if resetting the engine to tdc and re doing the wires will fix this. thank you for any help


(This post was edited by djbumman on Aug 6, 2010, 1:53 PM)


Sidom
Veteran / Moderator
Sidom profile image

Aug 6, 2010, 2:39 PM

Post #2 of 11 (1852 views)
Re: 83 chevy blazer back firing Sign In

That would be a good 1st step. Just to be sure pop out #1 plug to make sure you are coming up on the comp stroke and put the mark on TDC. Take the cap off to see what electrode the rotor is pointing at to verify #1 and check the firing order in a clockwise manner.
1 8 4 3 6 5 7 2


djbumman
Novice

Aug 6, 2010, 9:46 PM

Post #3 of 11 (1844 views)
Re: 83 chevy blazer back firing Sign In

thank you will be trying it today, will let you know how it goes


djbumman
Novice

Aug 7, 2010, 10:50 AM

Post #4 of 11 (1839 views)
Re: 83 chevy blazer back firing Sign In

just took out the spark plugs and they have oil on them, thinking i blew the head gaskets?


Sidom
Veteran / Moderator
Sidom profile image

Aug 7, 2010, 12:08 PM

Post #5 of 11 (1835 views)
Re: 83 chevy blazer back firing Sign In

Ok...Time to get a compression gauge and get a reading..... If the reading is high enough.... a cheap fix to get you going would be to install a non-fouler on the plug and of course may sure the firing order is correct.

Obviouly the correct way would be to repair the engine but this may get you by until you can afford to do it the right way.....


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Aug 7, 2010, 1:27 PM

Post #6 of 11 (1825 views)
Re: 83 chevy blazer back firing Sign In

I think we might want to ask just where you found this oil. Was it on the outside (porcelain part) of the plug?



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



djbumman
Novice

Aug 12, 2010, 9:15 AM

Post #7 of 11 (1798 views)
Re: 83 chevy blazer back firing Sign In

the oil was on the threads of the spark plug, i think it is the valve cover gaskets, they are both leaking


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Aug 12, 2010, 11:03 AM

Post #8 of 11 (1793 views)
Re: 83 chevy blazer back firing Sign In

That's right. It's the valve cover gasket.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



djbumman
Novice

Aug 12, 2010, 11:06 AM

Post #9 of 11 (1789 views)
Re: 83 chevy blazer back firing Sign In

now i got he engine running fine, but it still back fires, would that have anything to do with have long tube headers with glass packs bolted to them? also, the engine hesitates around 25 to 30 mph, would that be due to needing a larger air filter?


Sidom
Veteran / Moderator
Sidom profile image

Aug 12, 2010, 6:57 PM

Post #10 of 11 (1779 views)
Re: 83 chevy blazer back firing Sign In

How was it running before all this started?

If you didn't have the backfire problem before, you need to get back in there and triple check your work..... Take a good look at the firing order, especially #5 & #7, those are right next to each other mechanically & in the firing order.....Very easy to get installed incorrectly


djbumman
Novice

Aug 13, 2010, 8:48 AM

Post #11 of 11 (1766 views)
Re: 83 chevy blazer back firing Sign In

the truck was running fine before, and the wires are hooked up right so i really dont know now. would not having any back pressure have anything to do with it?






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