LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Could two huge vaccume leaks cause this weird problem?

Thread Tools
 
Search this Thread
 
Old 03-03-2004, 04:58 PM
  #1  
96z
Registered User
Thread Starter
 
96z's Avatar
 
Join Date: Jul 2000
Location: Buffalo, NY
Posts: 2,735
Could two huge vaccume leaks cause this weird problem?

Before I put the car away for winter I was having problems with an upper RPM miss that was predictable at 5500 RPMs or so and only happened under full throttle. In the fall I replaced the plugs,fuel filter, coil, and wires. The opti was ok and only had 2,000 miles on it. I readjusted the rocker arms several times etc, still all this to no avail.

Now a week ago I was messing around with the car and when I took the elbow off there was a huge gap where I used a pert plus bottle top to seal off the inside of the old air silencer. Also upon taking off the TB gasket I noticed the gasket was torn and there was a sooty sludge built up all along the bottom of the TB and intake.

Could these two leaks be the cause of that miss?
96z is offline  
Old 03-03-2004, 05:06 PM
  #2  
Registered User
 
scoobysnax83's Avatar
 
Join Date: Sep 2002
Location: Arlington, VA
Posts: 2,481
definitely
scoobysnax83 is offline  
Old 03-03-2004, 11:52 PM
  #3  
96z
Registered User
Thread Starter
 
96z's Avatar
 
Join Date: Jul 2000
Location: Buffalo, NY
Posts: 2,735
Lets hope so.
96z is offline  
Old 03-04-2004, 05:04 AM
  #4  
Registered User
 
scoobysnax83's Avatar
 
Join Date: Sep 2002
Location: Arlington, VA
Posts: 2,481
well, I'm not saying that is for sure your only problem, but probably your biggest.
scoobysnax83 is offline  
Old 03-04-2004, 01:23 PM
  #5  
96z
Registered User
Thread Starter
 
96z's Avatar
 
Join Date: Jul 2000
Location: Buffalo, NY
Posts: 2,735
Thats what Im thinking too. There is nothing left to replace AFAIK that could cause such a weird missfire.

This leak would have the potential to cause a decent powerloss also correct?
96z is offline  
Old 03-04-2004, 02:40 PM
  #6  
Registered User
 
scooters97ss's Avatar
 
Join Date: Apr 2001
Location: I been everywhere, man
Posts: 312
If it was sucking a lot of air in after the MAF seems to me like it would lean the mixture out badly and cause that kind of problem.
scooters97ss is offline  
Old 03-04-2004, 03:00 PM
  #7  
Registered User
 
scoobysnax83's Avatar
 
Join Date: Sep 2002
Location: Arlington, VA
Posts: 2,481
Originally posted by 96z
Thats what Im thinking too. There is nothing left to replace AFAIK that could cause such a weird missfire.

This leak would have the potential to cause a decent powerloss also correct?
It definitely will. When I bought my Z it had the infamous torn intake elbow. Once I fixed that I noticed a much smoother idle and much more response and power.

Idle smoothness is gone now, lol. Heads and cam does that
scoobysnax83 is offline  
Old 03-05-2004, 05:18 PM
  #8  
96z
Registered User
Thread Starter
 
96z's Avatar
 
Join Date: Jul 2000
Location: Buffalo, NY
Posts: 2,735
Originally posted by scooters97ss
If it was sucking a lot of air in after the MAF seems to me like it would lean the mixture out badly and cause that kind of problem.
Thats what Im thinking too. Especially since it only happens at upper RPM's and WOT.

Anyone else have any imput? The more people that concurr the better Ill feel.
96z is offline  
Old 03-05-2004, 05:56 PM
  #9  
Registered User
 
Spinner's Avatar
 
Join Date: Jul 2003
Location: Fort Benning, GA
Posts: 2,947
The sludge happens. It's backwash from your PCV system. IE: oil that gets past the baffles. It happens in every make/model of car. Just builds up over time, can be cleaned out relatively easily.
Spinner is offline  
Old 03-06-2004, 10:25 AM
  #10  
96z
Registered User
Thread Starter
 
96z's Avatar
 
Join Date: Jul 2000
Location: Buffalo, NY
Posts: 2,735
Originally posted by Spinner
The sludge happens. It's backwash from your PCV system. IE: oil that gets past the baffles. It happens in every make/model of car. Just builds up over time, can be cleaned out relatively easily.
And this could cause a missfire???
96z is offline  
Old 03-11-2004, 03:35 PM
  #11  
96z
Registered User
Thread Starter
 
96z's Avatar
 
Join Date: Jul 2000
Location: Buffalo, NY
Posts: 2,735
Anyone care to respond???
96z is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Magenta_Hearts
LT1 Based Engine Tech
15
03-29-2017 08:54 PM
alex5366
General 1967-2002 F-Body Tech
4
02-17-2015 10:43 PM
InfernalVortex
LT1 Based Engine Tech
3
01-17-2015 09:35 AM
97z28k&N
General 1967-2002 F-Body Tech
3
01-09-2015 04:58 AM
cmdeshon
New Member Introduction
3
12-12-2014 10:51 PM



Quick Reply: Could two huge vaccume leaks cause this weird problem?



All times are GMT -5. The time now is 03:29 PM.