Possible L27 UIM failure (with video)
#1
Thread Starter
Senior Member
True Car Nut
Joined: Aug 2004
Posts: 3,067
Likes: 1
From: In your garage, swipin' da lug nutz
Possible L27 UIM failure (with video)
Allow me to first say that this "possible" failure may not even be a failure, but rather a design flaw that may or may not have been encountered by others on this forum. Secondly, if it is a failure, it is not even close to how the L36 UIMs fail.
Now with that said...
I was working on the '94 SSE yesterday evening, hood open, engine running (checking for lifter chatter), and slight hand-induced movements to the throttle. Something caught the corner of my eye when I did this, and I was thinking "no way in h3LL". So I repeated blipping the throtte, watching the UIM. And sure enough, it happened again. What you ask? On the "front" of the engine (that would be the 1-2 cylinder side), near where the PCV valve is (I think it'* a PCV anyways...same location where the MAP would be on an L36), the whole "front" side of the UIM flexes when giving it the gas. And I wasn't goosing the throttle all the way either...it was more like reving to say, 3k then back to idle. It'* flexed for so long that stress cracks, or what appear to be stress cracks, have formed.
Current mileage is @123k. Pics and video will follow later this evening.
Has anyone else noticed this on their L27'* with composite UIMs?
Now with that said...
I was working on the '94 SSE yesterday evening, hood open, engine running (checking for lifter chatter), and slight hand-induced movements to the throttle. Something caught the corner of my eye when I did this, and I was thinking "no way in h3LL". So I repeated blipping the throtte, watching the UIM. And sure enough, it happened again. What you ask? On the "front" of the engine (that would be the 1-2 cylinder side), near where the PCV valve is (I think it'* a PCV anyways...same location where the MAP would be on an L36), the whole "front" side of the UIM flexes when giving it the gas. And I wasn't goosing the throttle all the way either...it was more like reving to say, 3k then back to idle. It'* flexed for so long that stress cracks, or what appear to be stress cracks, have formed.
Current mileage is @123k. Pics and video will follow later this evening.
Has anyone else noticed this on their L27'* with composite UIMs?
#2
Guest
Posts: n/a
No I have not noticed this on the L27'*.... But my 36 Upper does that as well... There is a bit of flex on the sucker
__________________
Best Car Insurance | Auto Protection Today | FREE Trade-In Quote
__________________
Best Car Insurance | Auto Protection Today | FREE Trade-In Quote
#3
Senior Member
Posts like a Camaro
Joined: Oct 2006
Posts: 987
Likes: 0
From: montreal canada NEBF07 ONBF07
my old upper on my L36 did the same the middle bolt was loose and the upper would move a each time a gave throttle to it like it was breathing .but had no leaks so i just gave that bolt one more turn. and later i found 2 more hidden bolt where loose when i change my upper
#4
Thread Starter
Senior Member
True Car Nut
Joined: Aug 2004
Posts: 3,067
Likes: 1
From: In your garage, swipin' da lug nutz
#5
Guest
Posts: n/a
LOL.... Yup my L36 does exactly that
__________________
Best Car Insurance | Auto Protection Today | FREE Trade-In Quote
__________________
Best Car Insurance | Auto Protection Today | FREE Trade-In Quote
Thread
Thread Starter
Forum
Replies
Last Post