Question about 1999 Oldsmobile Alero

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I have a 1999 olds alero, in which i just replaced all the gaskets and the front cylinder head. no more white smoke, but now it is backfiring and it wont stay running (low rpm). i had a code for a faulty maf sensor but i replaced that and the iac too and now no codes.... HELP ME PLEASE!!

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  • Jeff Turcotte
    Jeff Turcotte Oct 10, 2010

    did you have the timing belt loose? Sounds like valve timing is off.

  • wally_roark Oct 10, 2010

    no, didnt even take the cover off.

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  • Oldsmobile Master
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When putting back together did the pushrods go back in the right place, i yhink on these the exhaust and the intake push rods are diffrent theres a small diffrence in size,

Posted on Oct 10, 2010

Testimonial: "this was it, well kinda. i forgot to tighten down one of the rocker arms all the way (duh). but i still have a very low idle and a severe p0300-"

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  • wally_roark Oct 10, 2010

    i noticed that the intake was about half an inch shorter, by mistake of course. is there a way to check without ripping the whole thing apart again?

  • Jeff Turcotte
    Jeff Turcotte Oct 10, 2010

    that would explain backfire--if exhaust pushrod is too long...

  • wally_roark Oct 12, 2010

    random misfire and a pending p0300. i have new plugs, wires, coil packs, and i have all the hoses in place...

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  • Oldsmobile Master
  • 1,675 Answers

Hi this sounds like you have the firing order incorrect..have you tried changing the firing order? the firing order is, 1,2,3,4,5,6 and also check to see if you have left any vacuum hoses of as this will also give you the same problem ....hope this helps

Posted on Oct 10, 2010

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