SPONSORED LINKS

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.
Monday, September 29th, 2008 AT 8:49 PM

7 Replies

Tiny
OBXAUTOMEDIC
  • MECHANIC
  • 3,711 POSTS
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
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Monday, September 29th, 2008 AT 8:55 PM
Tiny
LGOODEN
  • MEMBER
  • 5 POSTS
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
Was this
answer
helpful?
Yes
No
Monday, September 29th, 2008 AT 9:32 PM
Tiny
OBXAUTOMEDIC
  • MECHANIC
  • 3,711 POSTS
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.
Was this
answer
helpful?
Yes
No
Monday, September 29th, 2008 AT 9:39 PM
Tiny
LGOODEN
  • MEMBER
  • 5 POSTS
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.
Was this
answer
helpful?
Yes
No
Monday, September 29th, 2008 AT 9:58 PM
Tiny
LGOODEN
  • MEMBER
  • 5 POSTS
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.
SPONSORED LINKS
Was this
answer
helpful?
Yes
No
Monday, September 29th, 2008 AT 11:55 PM
Tiny
OBXAUTOMEDIC
  • MECHANIC
  • 3,711 POSTS
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.
Was this
answer
helpful?
Yes
No
Tuesday, September 30th, 2008 AT 1:38 PM
Tiny
LGOODEN
  • MEMBER
  • 5 POSTS
I'm checkin or redoing a zero lash step
Was this
answer
helpful?
Yes
No
Tuesday, September 30th, 2008 AT 8:20 PM

Please login or register to post a reply.

Related Engine Misfire Content

Intermittent Misfire
VIDEO
Intermittent Misfire
Instructional repair video
Misfire Random Code P0300
GUIDE
Misfire Random Code P0300
The world of automotive diagnostics can be complex, with numerous codes and potential issues to keep track of. One of the more common engine diagnostic codes is P0300, which...
VIEW MORE

Sponsored links