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1998 Chev Blazer - hesitates, sometimes backfires, initial take-o

1998 Chev Blazer - hesitates, sometimes backfires, after start up and initial take-off. after you get through the initial take-off/ hesitation, it runs great and idles smooth. I've been completely through the whole electric and mechanical for the past 16 months. It throws a O2 sensor, but i don't believe it. I went to the junk yard and replace both O2 sensors. The Catalytic converter is still partially disconnected - thought it might be plugged. Just a guess, but it acts like it doesn't clear the gasses when shutdown. Therefore, the air is bad when start up. The air gets cleared when it run for a few minutes and everything is okay.

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  • mwfinley Jul 30, 2009

    I replaced the fuel injector rail. BUT, my son which is a great mechanic had a little too much to drink when we were putting them in. So he pinched the two back ones... I replaced those. I'm still not ruling out they are still not working right. In my personal opinion, what a piece of junk! I have a 90 buick century I restored and those are REAL fuel rails/injectors. So cool, you can put a screwdriver up to one and listen to the injector open and close. Yea, i'm from the old school. But, I am a computer analyst and understand the computer stuff. It might be a bad computer. I can pick one up at the u-pull-it for $25. I was kinda working around it. Got the ODBII software and it keeps throwing O2 sensor. I really don't believe it, but for peace of mind i pulled a couple at the u-pull-it - S10 pickup same setup. I pulled the heads and had them redone. It runs great... It doesn't run hot. Did the plugs, wires, distributor/rotor cap. Looked at the distributer, but it was not broke/warped. replace the cam shaft sensor. Get this one problem solved and we will be good to go. I need to service the transmission. On and on and on... Anyway thxs for your input. OH, i did replace the fuel filter. It was missing at high output. I like the WIX brand. A little higher but a better product than Fram, etc...

  • mwfinley Jul 30, 2009

    Yea i was working around that one. I can pick-up a computer at U-Pull-It for $25. I might as well try it. Haven't re-program a car computer before? What is the process?

  • Richard Scordino May 11, 2010

    A leaking injector can do that, and will clear just as you outlined...but you probably checked that already...


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I fixed a van with the same problem. I had to reprogram the computer. It shuold be the same idea with your truck.

Posted on Jul 30, 2009

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