Home page
SPONSOR AD

Support our Vendors!  |  Advertise Here

Topic: No spark

in Forum: C3 Engines


Already a Member?
Login
Not yet a Member?
Register for Free!

No spark (1/7)
 6/15/15 7:26pm
MAJOR C3
Former Member

Send Private Message

EAST NORTHPORT, NY - USA

Vette(s):
1982 C3


Joined: 7/17/2014
Posts: 4

Just changed the ignition wires on my 82 vette , while doing so I hit the wire on the started and caused a spark.  Car would not start no spark ,  I checked all the fuses , I have 12 volts at the distributer , I change the coil , cap rotor and the seven pin module , still no spark , any idears. 
Our Sponsors help support C3VR
Re: No spark (2/7)
 6/15/15 10:51pm
kstyerLifetime Member
Lifetime Member
Moderator
Send Private Message

CUYAHOGA FALLS, OH - USA

Vette(s):
1975 C3 Red, T-Tops, Black Interior. All I need is time and money! Getting there!


Joined: 12/2/2003
Posts: 6424

Does the engine crank? Do the headlights come on ( on, not lift)? Do you get dash warning lights. What did you use to check voltage to the distributor? Did you check power to the distributor when cranking, if it cranks? Do have power to the battery terminal on the alternator? Give me bit more to go on and we will solve this.
Re: No spark (3/7)
 6/16/15 1:27pm
Adams' AppleLifetime Member
Lifetime Member
Moderator
Send Private Message

Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas


Joined: 11/8/2003
Posts: 20126

 Ken beat me to it...I had the same questions. It's possible you burned a fuse link somewhere, and you don't have power(12v) to all the right places anymore. Check the headlights, and for power(12v) at the large terminal on the alternator. A test light may light up, making you think it has 12v, but it may only have 5 volts. Use a multi-meter to verify actual voltage.
Also, does the "Check Engine/Service Engine" light come on? You may have codes stored in the ECM that will give you/us a clue to what happened, and how to correct it. Find the diagnostic connector under the ashtray area. Look for the small letters on the side of the connector. Use a paper clip, or small wire to connect/jumper the "A" and "B" terminals, then turn the key ON(but don't start). The "Check engine) light will flash any codes stored. It should start by flashing one long flash,a short pause, then two short flashes, indicating a "12"(blink....blinkblink). This is just a code that lets you know the ECM is in diagnostic mode. It will flash any codes three times in a row, then go to the next stored code. Give this a shot and let us know if there are any codes stored. Thumbs Up

______________

Joel Adams
C3VR Lifetime Member #56    

My Link


(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

Re: No spark (4/7)
 6/16/15 5:54pm
MAJOR C3
Former Member

Send Private Message

EAST NORTHPORT, NY - USA

Vette(s):
1982 C3


Joined: 7/17/2014
Posts: 4

OK got back out to the car, I am using a multi meter to read voltage , I should mention I am an electrician. I have 12 volts at the alternator , also voltage at the distibuter when I crank the engine whick cranks fine, although the voltage does drop to 9.6 volts while cranking which I guess is expected. Lights come on but they dont pop up and there is no check engine lite on . Any idears ?
Re: No spark (5/7)
 6/16/15 9:55pm
kstyerLifetime Member
Lifetime Member
Moderator
Send Private Message

CUYAHOGA FALLS, OH - USA

Vette(s):
1975 C3 Red, T-Tops, Black Interior. All I need is time and money! Getting there!


Joined: 12/2/2003
Posts: 6424

9.6 is a minimum and should be enough with a stock ignition. My MSD ignition will will not fire below 10 volts. Voltage at the battery before cranking should be at least 12.4. This may sound a bit odd, but dispite the fact that the engine cranks ok, try charging the battery or hooking up a good set of jumper cables and try again. See if you get spark. If not we go from there, but it may fire. I have actually seen this several times. Let me know.
Re: No spark (6/7)
 6/17/15 9:28am
dwa175
Former Member

Send Private Message

leesburg, FL - USA

Vette(s):
1979 coupe and now 2007 c-6


Joined: 7/19/2014
Posts: 195

I found that this is always overlooked  this is correct  old vehicle need at least 12.5 our better charge battery check voltage with gauge  youmite be surprised  also note newer vehicle need at least 13.5 volts  to pcm,s to start   the guys here know what to do   dwaBeer
Re: No spark (7/7)
 6/17/15 1:09pm
Adams' AppleLifetime Member
Lifetime Member
Moderator
Send Private Message

Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas


Joined: 11/8/2003
Posts: 20126

 What exactly did you touch the starter wire(s) with that created a spark? The only fuse link I see on the diagram powers pretty much everything inside the car...head/tailights, courtesy lights, etc, but it also powers the anti-theft module(thru the fuse box). An errant "zap" might have damaged the module....
Can you hear the fuel pump run when you first turn the key on?
Reading the first post, it appears that you replaced the ign module/coil etc. AFTER replacing the plug wires, and finding out it wouldn't start? Or was all of that done at the same time as the plug wires?

This might get interesting...Geek



______________

Joel Adams
C3VR Lifetime Member #56    

My Link


(click for Texas-sized view!)
             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

Our Sponsors help support C3VR