LT1-LT4 Modifications 1993-97 Gen II Small Block V8

1500 - 1800 rpm Stumble

Old 01-11-2006, 09:55 AM
  #1  
Staging Lane
Thread Starter
iTrader: (1)
 
DMark's Avatar
 
Join Date: Feb 2005
Location: Tennessee
Posts: 64
Likes: 0
Received 0 Likes on 0 Posts
Default 1500 - 1800 rpm Stumble

My son has a 1995 TA auto trans with 72k miles. Car only has a K&N CAI and Hooker catback. Appears that the Opti, wires, and plugs are the orginals.

Last night it began to "stumble" between 1500-1800 rpm. There is no backfire. Pass 1800 rpm it pulls hard all the way to its redline. There is no SES light.

Any advice on where to begin troubleshooting?

Thanks,

DMark
Old 01-11-2006, 10:09 AM
  #2  
TECH Fanatic
 
blkchevyz's Avatar
 
Join Date: Oct 2003
Posts: 1,101
Likes: 0
Received 0 Likes on 0 Posts

Default

could be the start of the o2 sensors going bad.
does it drive any differently when he just starts it up?
Old 01-11-2006, 10:22 AM
  #3  
Staging Lane
Thread Starter
iTrader: (1)
 
DMark's Avatar
 
Join Date: Feb 2005
Location: Tennessee
Posts: 64
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by blkchevyz
could be the start of the o2 sensors going bad.
does it drive any differently when he just starts it up?
Car starts good, idles good. Only problem is between 1500-1800 rpm.

DMark
Old 01-11-2006, 03:48 PM
  #4  
TECH Resident
iTrader: (25)
 
Ari G's Avatar
 
Join Date: Jul 2005
Location: Houston
Posts: 818
Likes: 0
Received 0 Likes on 0 Posts

Default

could be that is is running on 7 cyllenders,is there a loss in power especially at low rpm???
Old 01-13-2006, 01:40 PM
  #5  
Staging Lane
Thread Starter
iTrader: (1)
 
DMark's Avatar
 
Join Date: Feb 2005
Location: Tennessee
Posts: 64
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by Ari G
could be that is is running on 7 cyllenders,is there a loss in power especially at low rpm???
After getting a scan, everything points to going ahead and replacing the Cap/Rotor/Wires/Plugs.

I have all of the parts and the shop manual.

Anybody have any good suggestions & tricks of the trade?

Thanks,

DMark
Old 01-14-2006, 06:17 PM
  #6  
TECH Enthusiast
iTrader: (1)
 
Renegade's Avatar
 
Join Date: May 2005
Location: South Dakota
Posts: 650
Likes: 0
Received 0 Likes on 0 Posts
Default

None of the project is going to be too fun, but I would suggest the MSD Cap and Rotor. Cheaper, and an awesome product. Take your time as well, it's easy to get frustrated :-).
Old 01-15-2006, 09:23 AM
  #7  
Staging Lane
Thread Starter
iTrader: (1)
 
DMark's Avatar
 
Join Date: Feb 2005
Location: Tennessee
Posts: 64
Likes: 0
Received 0 Likes on 0 Posts
Default

I've done LT1s in Vettes & Impalas..., but this is my first FBody. I'm taking my time and so far have only a small amount of blood lost.

YET..., whoever designed the over-engineered wire holders and fasteners should burn in HELL!!!!!!

DMark

Last edited by DMark; 01-15-2006 at 09:41 AM.
Old 01-16-2006, 10:28 PM
  #8  
Staging Lane
Thread Starter
iTrader: (1)
 
DMark's Avatar
 
Join Date: Feb 2005
Location: Tennessee
Posts: 64
Likes: 0
Received 0 Likes on 0 Posts
Default

Well, Well..., I didn't know that the Opti was "Oil-Cooled."

Found the problem gang, when I took the cap off of the Opti it had oil all over the inside. Seals are shot. Complete new Opti going in now.

And as an added bonus, the waterpump isn't looking too good either. I'm going to replace that also.

DMark


Thread Tools
Search this Thread

All times are GMT -5. The time now is 06:10 PM.