Electronics Need help wiring something up? Thinking of adding an electrical component to your car? Need help troubleshooting that wiring glitch?

Tach reads double rpm and timing light marks are way off

Thread Tools
 
Search this Thread
 
Old 04-06-2004, 12:50 AM
  #1  
Member
Thread Starter
 
Mark P.'s Avatar
 
Join Date: Mar 2004
Location: Tennessee
Posts: 136
Likes: 0
Received 0 Likes on 0 Posts
Car: '88 Sport Coupe Convertible in Yellow Gold
Engine: '70 LT1, AFR 190s
Transmission: T5
Tach reads double rpm and timing light marks are way off

This is probably a comon question but I read back in the board and didn't find an answer. I just dropped in a 350 in my '88 vert and my tach reads nowhere near right and when i put a timing light on it, it reads off the bracket to the left...any help?
Old 04-07-2004, 08:26 PM
  #2  
Supreme Member

iTrader: (2)
 
jwfirebird's Avatar
 
Join Date: Aug 2002
Location: Western NY State
Posts: 1,018
Likes: 0
Received 1 Like on 1 Post
Car: 87 bird
Engine: enough to break stuff
Transmission: manual th400
Axle/Gears: 4.10
what did you change as far as ign components and does it run ok?
Old 04-07-2004, 09:29 PM
  #3  
Member
Thread Starter
 
Mark P.'s Avatar
 
Join Date: Mar 2004
Location: Tennessee
Posts: 136
Likes: 0
Received 0 Likes on 0 Posts
Car: '88 Sport Coupe Convertible in Yellow Gold
Engine: '70 LT1, AFR 190s
Transmission: T5
It runs real good! I did not do the install but it looks like everything from the original loom is hooked up except the o2 sensor and the TBI plug. The guy who put it in did a real clean job..but he wouldn't let me pick his brain...probably wants me to have him do all my work but.....I'm taking it from here and I wish I did the install too now. the motor is a '70 vette .030 over 350 / 4 bolt mains. casting # 3970010
Old 04-07-2004, 09:49 PM
  #4  
Member
Thread Starter
 
Mark P.'s Avatar
 
Join Date: Mar 2004
Location: Tennessee
Posts: 136
Likes: 0
Received 0 Likes on 0 Posts
Car: '88 Sport Coupe Convertible in Yellow Gold
Engine: '70 LT1, AFR 190s
Transmission: T5
I have re-dropped the distributer...twice and it is in right. When I turn the dist and put the balancer mark on the timing marks it pops and sputters like it's too far advanced...dial it back and it runs and pulls REAL strong all the way through the powerband and restarts great so it's pretty close to right.....with the balancer mark reading about a 1/2 inch to the left of the timing mark bracket....no Idea if the cam has been indexed but I'll know as soon as the AFR heads, cam, and Holley StealthRam get here. The Holley 950 ECM will probably fix it but I want to drive the car as is till I get time to put in the new MPFI system...and that still wont adress the Tach....or will it?

Last edited by Mark P.; 04-07-2004 at 09:59 PM.
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
specialized
TPI
27
06-18-2022 09:26 AM
Andrew6.688
TPI
10
12-13-2015 10:59 AM
Omega
Interior Parts for Sale
2
08-10-2015 12:46 PM
Thirim
LTX and LSX
2
08-09-2015 06:19 PM
stalkier
Electronics
5
08-07-2015 04:49 AM



Quick Reply: Tach reads double rpm and timing light marks are way off



All times are GMT -5. The time now is 03:43 AM.