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my truck is running very rough
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Joe Steadery
New User
Dec 11, 2009, 6:28 PM
Post #1 of 4
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my truck is running very rough
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I have a 1995 Chevy S-10 Blazer 4.3 V6 (ENG vin code is W )
Ireplaced the CPI and now the truck runs real rough and missfires and hardly moves when in gear as it is missfiring even small backfires when you try to rev it up .
Also after running for a bit the catalytic converter glowed red hot . I replaced the catalytic converter and the #2 oxygen sensor and the spark plugs and it still ran very rough and the converter and the pipe to the muffler still glowed red hot . I didn't replace the #1 O2 sensor in front of the converter should I have replaced it too ? Also after it glowed red do you think that the new #2 O2 sensor and new converter is now bad or can it handle 1 time of being red hot ? Did I ruin the new converter and O2 sensor by running it till it was glowing red hot . The truck also has a fairly new muffler and tail pipe is it possible that it is plugged now do to running with red hot converter . so to recap I have installed a new CPI -Spider fuel Injector assembly and a new Catalytic converter , O2 sensor on downstream side and new spark plugs , air filter and oil too . I checked EGR and its not plugged and plunger moves ok . i checked the cap n rotor and they looked fine . So whats next move ? The truck runs real rough and missfires and hardly moves when put into gear .
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steve01832
Veteran
Dec 11, 2009, 6:46 PM
Post #2 of 4
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Re: my truck is running very rough
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Joe, usually when a converter gets cherry red it is due to an ignition problem, usually. What is going on is there is a lot of unburned fuel going out an exhaust valve and it is being burned in the converter. That's why it cherries up. It is also possible that the vehicle is running excessively rich, or has a bad cylinder.
You may want to start by hooking up a fuel pressure guage. If the pressure is ok, start checking the ignition system. Could be a cracked cap, bad plug, or bad plug wire. I have seen failing ignition modules cause this, but very few and far between. Maybe 3 or 4 times in the 26 years I've been twisting a wrench.
Steve
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Hammer Time
Ultimate Carjunky
/ Moderator
Dec 11, 2009, 6:47 PM
Post #3 of 4
(3354 views)
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Re: my truck is running very rough
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Most of that stuff wan't necessary. the Cat is glowing because of either too rich or too lean of mixture. You really need a scan tool to find out which it is. You could have an internal fuel or vacuum leak.
We were typing at the same time Steve.
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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.
(This post was edited by Hammer Time on Dec 11, 2009, 6:48 PM)
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steve01832
Veteran
Dec 11, 2009, 6:52 PM
Post #4 of 4
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Re: my truck is running very rough
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Great minds think alike Desi. lol
Steve
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