No spark now!??!
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No spark now!??!
so basically this all started when a piece of my block broke off where the outside starter bolt goes.. here's the thread for those interested..
http://forums.corvetteforum.com/c5-t...hing-else.html
NOW, i have the block welded (battery was unplugged), put everything back together, go to crank. well the motor turns over now, but WONT START. i hooked up a tech 2 to it and it's not getting any spark and the computer isnt registering RPM. since, i've changed the crankshaft sensor to no avail. now i'm thinking the computer is bad or there's a broken wire somewhere in the harness that connects through the crankshaft sensor. i guess it would be possible to backfeed current through the harness with the battery unhooked. what do you guys think?
another question... if i do figure it's the computer, could ECS or any of those guys that do mail order tunes tune a new computer including the initial programming for my vin on my car without it being installed on the car?
any help or feedback is appreciated.
beau
http://forums.corvetteforum.com/c5-t...hing-else.html
NOW, i have the block welded (battery was unplugged), put everything back together, go to crank. well the motor turns over now, but WONT START. i hooked up a tech 2 to it and it's not getting any spark and the computer isnt registering RPM. since, i've changed the crankshaft sensor to no avail. now i'm thinking the computer is bad or there's a broken wire somewhere in the harness that connects through the crankshaft sensor. i guess it would be possible to backfeed current through the harness with the battery unhooked. what do you guys think?
another question... if i do figure it's the computer, could ECS or any of those guys that do mail order tunes tune a new computer including the initial programming for my vin on my car without it being installed on the car?
any help or feedback is appreciated.
beau
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yes. the starter turns the motor over, but it wont crank because there's no spark. when turning it over, the tech 2 does not register engine rpm or spark. the fuel pump kicks on when the key is on the on position, so i know it's getting fuel.
Melting Slicks
Joined: Sep 2006
Posts: 2,041
Likes: 4
From: Rockford Illinois
While the block was being welded, in sure the ground for the welder was on the chassis of the car?? Or was the motor pulled out? If so without the battery being disconnected etc you could have destroyed some electrical, BCM, ECM.
EDIT.. I would start going trhu fuses,Relays, checking continuity,and voltage to the coil packs.
EDIT.. I would start going trhu fuses,Relays, checking continuity,and voltage to the coil packs.
Last edited by Blown 346; Jan 29, 2010 at 08:57 AM.
Tech Contributor
Joined: Jan 2007
Posts: 19,390
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From: Dyer, IN
You need to determine if you damaged the crank sensor wiring during the starter repair.
Last edited by lucky131969; Jan 29, 2010 at 09:55 AM.
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blown 346 - went through the fusebox with a testlight and all looks good. the motor was in the car when it was welded. the welder grounded on the oil pan.
lucky131969 - i began checking wiring last night. the blue wire was hot. the white and red were not. i'm going to have to get a diagram for the crank sensor this evening when i get off of work to get a better idea of what i'm looking for.
lucky131969 - i began checking wiring last night. the blue wire was hot. the white and red were not. i'm going to have to get a diagram for the crank sensor this evening when i get off of work to get a better idea of what i'm looking for.
Tech Contributor
Joined: Jan 2007
Posts: 19,390
Likes: 1,135
From: Dyer, IN
blown 346 - went through the fusebox with a testlight and all looks good. the motor was in the car when it was welded. the welder grounded on the oil pan.
lucky131969 - i began checking wiring last night. the blue wire was hot. the white and red were not. i'm going to have to get a diagram for the crank sensor this evening when i get off of work to get a better idea of what i'm looking for.
lucky131969 - i began checking wiring last night. the blue wire was hot. the white and red were not. i'm going to have to get a diagram for the crank sensor this evening when i get off of work to get a better idea of what i'm looking for.
Former Vendor
Joined: Jan 2007
Posts: 1,584
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From: Lubbock Tx
Sounds like you might have run the blackish brown fusible link wire to ground instead of to the hot post. If you follow that wire back a few inches there is a link and then it's red other the other side.
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hmmm... maybe i am making reference to the extension on the crankshaft sensor so it has more slack to go around the header? the car is a 99 frc. dont know if colors of wire could have changed within years? i dont know. i could have sworn they were red, white, and blue. then again, it was late... i'm going to have to take another look. thanks for the diagram man i appreciate it.
SDPC - are you referring to wires going to the starter? i have one to the small post up top and 3 on the lower hot post.
SDPC - are you referring to wires going to the starter? i have one to the small post up top and 3 on the lower hot post.
