When it rains it POURS!!! - ZR-1 Net Registry Forums

C4Fanatic · 01-31-2012

Took the car for a spin yesterday evening after getting the plenum pull finished and all buttoned up.

Seemed like the idle was still a little high...guess I need to check that primary throttle plate actuator like rhipsher has suggested I do.
So, I stop and blip the throttle, get it to idle down then decide to blow the cobs out a little. Nailed the throttle from a slow roll and before I could catch it, the back tires let loose and I hit the rev limiter...I think...tach flashed 8k. CRAP!
Drive the rest of the way home, no issues, but I think I hear something.
Go out today to drive it down the road and definitely hear something now.
Pop the hood and hear a clatter that seems to be coming from under the drivers side cam cover.........#$%)@((#&%*()&()#*@$&!!!!!!!!!!!!!!! !!

So, if you were to venture a guess...lifter...cam lobe??? I think I'm in the same boat as VetteMed...don't have the dinero's to pull the motor or to send the car to Mark or Corey right now. Is pulling the cam cover for a quick peek a big job that can handled in the garage?

CRAP CRAP CRAP...

LGAFF · 01-31-2012

PS is not bad, but not easya the bolts tend to stick alittle......a quick trip to 8K really should not do the motor in. the 8K failures I have heard of were more sustained speeds as you would at a track......but with aged pieces, who knows.

C4Fanatic · 01-31-2012

It was a VERY quick trip, but you know us old guys and our reaction times! Got off the throttle as quick as I could lift my foot. One of those "DAMN THAT WAS QUICK" moments.

I'm going to have a mechanic buddy come take a listen. I just noticed that the serpentine belt tensioner is bouncing around. The motor runs smooth and doesn't seem to have a miss like I would expect, so I'm still searching.

USAFPILOT · 01-31-2012

If you hit the rev limiter, shouldn't it have not spun beyond whatever the limiter is set at?

VetteMed · 01-31-2012

Quote:

Originally Posted by USAFPILOT

If you hit the rev limiter, shouldn't it have not spun beyond whatever the limiter is set at?

Correct, only way to over-rev is either due to an incorrect shift (meant to hit fifth, got third instead, or a poorly judged downshift (should have grabbed third, went for second instead). Either situation will not be prevented by a rev limiter in the ECM / PROM.

C4Fanatic · 01-31-2012

Actually it was just a hammer down acceleration in 1st that spun the tires and I saw the tach hit 8,000...come to think of it, it never even acted like it hit a rev limiter.

Kevin · 01-31-2012

if you hit 8k you either don't have a limiter on your chip or your tach is off. factory redline is just over 7, I know of a few 415's that are 7.5

C4Fanatic · 01-31-2012

I'm thinking the limiter has been E-limi-nated at some point in this cars life

Kevin · 01-31-2012

i can't imagine why someone would do that

cvette98pacecar · 01-31-2012

Dave, Sorry to hear the bad news. Guess you have to get another ZR-1 until you can get the car to Mark or Corey, Dont forget about Aaron (SGC). That is a beautiful car, Are you thinking 385 or 415?

01-31-2012	#1
C4Fanatic Join Date: Dec 2010 Location: Sin City Posts: 149	When it rains it POURS!!! Took the car for a spin yesterday evening after getting the plenum pull finished and all buttoned up. Seemed like the idle was still a little high...guess I need to check that primary throttle plate actuator like rhipsher has suggested I do. So, I stop and blip the throttle, get it to idle down then decide to blow the cobs out a little. Nailed the throttle from a slow roll and before I could catch it, the back tires let loose and I hit the rev limiter...I think...tach flashed 8k. CRAP! Drive the rest of the way home, no issues, but I think I hear something. Go out today to drive it down the road and definitely hear something now. Pop the hood and hear a clatter that seems to be coming from under the drivers side cam cover.........#$%)@((#&%()&()#@$&!!!!!!!!!!!!!!! !! So, if you were to venture a guess...lifter...cam lobe??? I think I'm in the same boat as VetteMed...don't have the dinero's to pull the motor or to send the car to Mark or Corey right now. Is pulling the cam cover for a quick peek a big job that can handled in the garage? CRAP CRAP CRAP...

01-31-2012	#2
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,194	Re: When it rains it POURS!!! PS is not bad, but not easya the bolts tend to stick alittle......a quick trip to 8K really should not do the motor in. the 8K failures I have heard of were more sustained speeds as you would at a track......but with aged pieces, who knows. __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 Last edited by LGAFF; 01-31-2012 at 05:42 PM.

01-31-2012	#3
C4Fanatic Join Date: Dec 2010 Location: Sin City Posts: 149	Re: When it rains it POURS!!! It was a VERY quick trip, but you know us old guys and our reaction times! Got off the throttle as quick as I could lift my foot. One of those "DAMN THAT WAS QUICK" moments. I'm going to have a mechanic buddy come take a listen. I just noticed that the serpentine belt tensioner is bouncing around. The motor runs smooth and doesn't seem to have a miss like I would expect, so I'm still searching.

01-31-2012	#4
USAFPILOT Join Date: Aug 2007 Location: Spring TX Posts: 1,348	Re: When it rains it POURS!!! If you hit the rev limiter, shouldn't it have not spun beyond whatever the limiter is set at? __________________ 1994 #293 ZR-1 Stainless Works Long Tube Headers, B&B catback w/ X-Pipe, 18" Shelby Series One Wheels, SLP CAI.

01-31-2012	#6
C4Fanatic Join Date: Dec 2010 Location: Sin City Posts: 149	Re: When it rains it POURS!!! Actually it was just a hammer down acceleration in 1st that spun the tires and I saw the tach hit 8,000...come to think of it, it never even acted like it hit a rev limiter.

01-31-2012	#7
Kevin Join Date: Jun 2005 Location: pittsburgh Posts: 4,632	Re: When it rains it POURS!!! if you hit 8k you either don't have a limiter on your chip or your tach is off. factory redline is just over 7, I know of a few 415's that are 7.5 __________________ It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B"

01-31-2012	#8
C4Fanatic Join Date: Dec 2010 Location: Sin City Posts: 149	Re: When it rains it POURS!!! I'm thinking the limiter has been E-limi-nated at some point in this cars life

01-31-2012	#9
Kevin Join Date: Jun 2005 Location: pittsburgh Posts: 4,632	Re: When it rains it POURS!!! i can't imagine why someone would do that __________________ It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B"

01-31-2012	#10
cvette98pacecar Join Date: May 2011 Location: Sydney, Australia Posts: 2,479	Re: When it rains it POURS!!! Dave, Sorry to hear the bad news. Guess you have to get another ZR-1 until you can get the car to Mark or Corey, Dont forget about Aaron (SGC). That is a beautiful car, Are you thinking 385 or 415?