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

Help! Dyno Graph inside...high rev miss?

Old Jan 30, 2003 | 02:07 PM
  #1  
sherwinZ28's Avatar
Thread Starter
Registered User
 
Joined: Sep 2002
Posts: 214
From: Hayward, CA
Help! Dyno Graph inside...high rev miss?



I put in the new cam and have been having this high rpm miss...around 4800+ rpm. Not sure what it could be. I changed plugs(gapped to .50), wires(taylor OTV), and new valvetrain. If one of the plug wires is not properly installed or made, could this be the problem?
The car is not tuned but I doubt thats the problem. I just wanted to see how much power I could make with and without tuning...plus LT1Edit is expensive.
Old Jan 30, 2003 | 02:11 PM
  #2  
'94 Bad A Z28's Avatar
Registered User
 
Joined: Jan 2001
Posts: 2,905
From: Orlando,Fl
Link doesn't work, says I have to sign in.

Sign out then post a link to it.
Old Jan 30, 2003 | 02:33 PM
  #3  
'94 Bad A Z28's Avatar
Registered User
 
Joined: Jan 2001
Posts: 2,905
From: Orlando,Fl
Problem could be that it's not tuned... Or you could have a dieing Opti/ or Coil... And yes if the wires were not installed properly, not all snapped on, that could be what is causing this mis.
Old Jan 30, 2003 | 02:37 PM
  #4  
sherwinZ28's Avatar
Thread Starter
Registered User
 
Joined: Sep 2002
Posts: 214
From: Hayward, CA
Well I made sure the wires snapped onto the plugs.
Here is a better, faster site with the dyno graph. Is there a way I can check resistance on the plug wire to see if it is working correctly?

sherwin's dyno graph
Old Jan 30, 2003 | 02:41 PM
  #5  
'94 Bad A Z28's Avatar
Registered User
 
Joined: Jan 2001
Posts: 2,905
From: Orlando,Fl
When was the last time you changed your fuel filter?
Old Jan 30, 2003 | 02:42 PM
  #6  
sherwinZ28's Avatar
Thread Starter
Registered User
 
Joined: Sep 2002
Posts: 214
From: Hayward, CA
Thought about that too...so I changed it like 3 weeks ago. The graph shows its running rich so I don't think its fuel related, I might be wrong though.
Old Jan 30, 2003 | 02:45 PM
  #7  
'94 Bad A Z28's Avatar
Registered User
 
Joined: Jan 2001
Posts: 2,905
From: Orlando,Fl
Originally posted by sherwinZ28
Thought about that too...so I changed it like 3 weeks ago. The graph shows its running rich so I don't think its fuel related, I might be wrong though.
Hrm... You could also be getting too much fuel, and the car could be chocking it's self in it. Didn't notice it in your signature, what size injectors do you have? Also what FP are you running?
Old Jan 30, 2003 | 02:47 PM
  #8  
sherwinZ28's Avatar
Thread Starter
Registered User
 
Joined: Sep 2002
Posts: 214
From: Hayward, CA
The fuel system is stock...I didn't think I would need to upgrade the injectors.
Old Jan 30, 2003 | 02:51 PM
  #9  
'94 Bad A Z28's Avatar
Registered User
 
Joined: Jan 2001
Posts: 2,905
From: Orlando,Fl
Originally posted by sherwinZ28
The fuel system is stock...I didn't think I would need to upgrade the injectors.
I didn't say you did, I was thinking if you did you could be getting TOO much fuel in to the motor...

Here is another POSSIABILITY, your Opti could be on it's way out... Not getting enough spark up top is usually Opti/ Coil related... Might want to try changing your Coil.
Old Jan 30, 2003 | 03:45 PM
  #10  
sherwinZ28's Avatar
Thread Starter
Registered User
 
Joined: Sep 2002
Posts: 214
From: Hayward, CA
Yeah Opti and Coil are still stock...but I was wondering why would they go out all of a sudden when they were just working perfectly prior to the cam install. The car has 96000 miles on it now but I will get a new coil and try that out. I hope its not the opti...don't feel like taking all that stuff out again.
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
KYWes
LT1 Based Engine Tech
8
Jun 14, 2022 06:52 AM
13qtr
LT1 Based Engine Tech
23
Jul 19, 2015 05:30 PM
94Form
LT1 Based Engine Tech
12
Jul 17, 2015 10:56 PM
Strick
LT1 Based Engine Tech
2
Jul 14, 2015 07:28 AM
asilomar244
LT1 Based Engine Tech
17
Jul 12, 2015 05:53 AM


Thread Tools
Search this Thread

All times are GMT -5. The time now is 09:42 AM.