1999 Oldsmobile Alero Misfire

Tiny
LGOODEN
  • MEMBER
  • 1999 OLDSMOBILE ALERO
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 12,500 MILES
I have a 1999 Alero, Cylinder 5 misfire. Ploblem is when I torque down the rocker arm it loses compression. It their a fix. I've had my head service three times.
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Monday, September 29th, 2008 AT 8:49 PM

7 Replies

Tiny
OBXAUTOMEDIC
  • EXPERT
Hello,

In most cases when a cylinder missfire is set, the fix is to check the simplest thing first.

Check Plug and wire check coil check injector
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Monday, September 29th, 2008 AT 8:55 PM
Tiny
LGOODEN
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I've replaced spark plugs, head job three times, With a compression tester installed, the problem accures during torque of the rocker arm, with the tightness of my hand it ok, as soon as I put a torque rench on it the compression lowers, at 14 ft pounds w/ or w/out a quarter turn. I loose compression on that cylinder
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Monday, September 29th, 2008 AT 9:32 PM
Tiny
OBXAUTOMEDIC
  • EXPERT
Does the rocker arm look worn?

Have you tried changing out one of the other rockers to see if it changes to another cylinder.

If it does replace rockers.
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Monday, September 29th, 2008 AT 9:39 PM
Tiny
LGOODEN
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Yes, the rocker arm looks mine, I've had a mechnices look at them, It a long shot but I'll try to replace the rocker arm.
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Monday, September 29th, 2008 AT 9:58 PM
Tiny
LGOODEN
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I've chancged rocker arms, still same problem, what our the chances that the lob on that cylinder is bad, or worn, if so changing new heads would not help

Thanks for your feed.
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Monday, September 29th, 2008 AT 11:55 PM
Tiny
OBXAUTOMEDIC
  • EXPERT
One other thing to check if you haven't already.

The Lifter, if it is frozen or stuck then it will cause your problem also.

I don't remember if the push rod hole is big enough to pull the lifter out through it.
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Tuesday, September 30th, 2008 AT 1:38 PM
Tiny
LGOODEN
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I'm checkin or redoing a zero lash step
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Tuesday, September 30th, 2008 AT 8:20 PM

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