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No spark #851984 11/12/10 05:52 PM 11/12/10 05:52 PM
Joined: May 2010 Posts: 219 Southwest way2fast OP enthusiast
way2fast OP enthusiast Joined: May 2010 Posts: 219 Southwest	Alright, getting ready to fire up the 318 in my 78 club cab. Have power to the + side of the coil but no spark.... where to now? Go Fast and Swerve!

Re: No spark [Re: way2fast] #851985 11/12/10 07:04 PM 11/12/10 07:04 PM
Joined: Jan 2003 Posts: 32,957 Grand Prairie,Texas stumpy I Win
stumpy I Win Joined: Jan 2003 Posts: 32,957 Grand Prairie,Texas	Do you have power to the coil while cranking or just with the key in the on position?

Re: No spark [Re: stumpy] #851986 11/12/10 07:37 PM 11/12/10 07:37 PM
Joined: May 2010 Posts: 219 Southwest way2fast OP enthusiast
way2fast OP enthusiast Joined: May 2010 Posts: 219 Southwest	Quote: Do you have power to the coil while cranking or just with the key in the on position? Key in on position, didn't try while cranking yet..dark now... will try tomorrow. I went and bought a new ballast resistor, had to order the starter relay, won't be in until Sunday. Checked the fusable link, looks good. Have power to the #2 pin on the ECU with key on. Coil shows about 8.9 ohms either side. Go Fast and Swerve!

Re: No spark [Re: way2fast] #851987 11/12/10 08:18 PM 11/12/10 08:18 PM
Joined: Jan 2003 Posts: 32,957 Grand Prairie,Texas stumpy I Win
stumpy I Win Joined: Jan 2003 Posts: 32,957 Grand Prairie,Texas	If it turns over with the key then you don't need a starter relay because it's working. There is two hot circuits to the coil 12v while cranking and 9v in the run positrion. If you have power to the coil in the run position then you should be able to turn the key on and jump the starter relay or the starter and it will have spark to the plugs.

Re: No spark [Re: stumpy] #851988 11/13/10 10:13 AM 11/13/10 10:13 AM
Joined: Jan 2003 Posts: 21,080 Niles , Ohio T therocks oh wait.but hey.lets see.oh yeah.
therocks oh wait.but hey.lets see.oh yeah. T Joined: Jan 2003 Posts: 21,080 Niles , Ohio	Hook a test light to ground and hold the other end to the neg on coil that goes to the dist.Crank it and it should flash.That tells you everything to the dist and the dist is good.Rocky Chrysler Firepower

Re: No spark [Re: therocks] #851989 11/13/10 11:00 AM 11/13/10 11:00 AM
Joined: May 2010 Posts: 219 Southwest way2fast OP enthusiast
way2fast OP enthusiast Joined: May 2010 Posts: 219 Southwest	Quote: Hook a test light to ground and hold the other end to the neg on coil that goes to the dist.Crank it and it should flash.That tells you everything to the dist and the dist is good.Rocky Yup, did that. no flash, also when my key is in the run position I have battery voltage at the coil positive, I thought the Ballast resistor was supposed to drop the voltage? Go Fast and Swerve!

Re: No spark [Re: way2fast] #851990 11/13/10 11:13 AM 11/13/10 11:13 AM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	when cranking you have the light at the coil neg pri & it is lit but it is not flashing on/off? (1) ECU lost it's ground (2) ECU bad (3) dist not triggering the ECU (check pickup continuity and disconnected/by itself it should generate iirc ~1volt when cranking (vom on low scale for volts) live every 24 hour block of time like it's your last day on earth

Re: No spark [Re: RapidRobert] #851991 11/13/10 11:49 AM 11/13/10 11:49 AM
Joined: May 2010 Posts: 219 Southwest way2fast OP enthusiast
way2fast OP enthusiast Joined: May 2010 Posts: 219 Southwest	Quote: when cranking you have the light at the coil neg pri & it is lit but it is not flashing on/off? (1) ECU lost it's ground (2) ECU bad (3) dist not triggering the ECU (check pickup continuity and disconnected/by itself it should generate iirc ~1volt when cranking (vom on low scale for volts) Power at coil +...none at negative or at the primary going to the distributor. Bad coil?? Go Fast and Swerve!

Re: No spark [Re: way2fast] #851992 11/13/10 12:07 PM 11/13/10 12:07 PM
Joined: Mar 2008 Posts: 5,746 Ontario, Canada Dodgem master
Dodgem master Joined: Mar 2008 Posts: 5,746 Ontario, Canada	The wires are hooked to the right sides of the coil?? test both sides. Check wires connected to dizzy? It happens. Reset reluctor gape in dizzy to .004

Re: No spark [Re: Dodgem] #851993 11/13/10 12:52 PM 11/13/10 12:52 PM
Joined: Jan 2003 Posts: 32,957 Grand Prairie,Texas stumpy I Win
stumpy I Win Joined: Jan 2003 Posts: 32,957 Grand Prairie,Texas	.004 is too tight. Factory calls for .008. The tightest I'd go is .006. That will allow for any wobble in the shaft.

Re: No spark [Re: stumpy] #851994 11/13/10 02:25 PM 11/13/10 02:25 PM
Joined: Mar 2008 Posts: 5,746 Ontario, Canada Dodgem master
Dodgem master Joined: Mar 2008 Posts: 5,746 Ontario, Canada	I ran .004 for 15 years worked great now I have a MSD.

Re: No spark [Re: Dodgem] #851995 11/13/10 03:07 PM 11/13/10 03:07 PM
Joined: Jan 2003 Posts: 32,957 Grand Prairie,Texas stumpy I Win
stumpy I Win Joined: Jan 2003 Posts: 32,957 Grand Prairie,Texas	That doesn't make it right. Like I said the factory calls for .008. After all they just designed the system and don't know any better.

Re: No spark [Re: stumpy] #851996 11/13/10 03:34 PM 11/13/10 03:34 PM
Joined: Mar 2008 Posts: 5,746 Ontario, Canada Dodgem master
Dodgem master Joined: Mar 2008 Posts: 5,746 Ontario, Canada	Well it is just a magnet that creates a field when the reluctor peaks pass so closer is more likely to get a reading. Just telling what works! especially on a street strip motor.

Re: No spark [Re: way2fast] #851997 11/13/10 04:03 PM 11/13/10 04:03 PM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	Quote: I thought the Ballast resistor was supposed to drop the voltage? it does when current is flowing,until then the voltage (pressure) is backed up & stays the same. OK unplug the yellow solenoid wire from the starter relay to disable the starter (no need to run the batt down nor listen to the noise distraction) then take off any and all wires from the coil primary NEGATIVE terminal then w a jumper wire w alligator clips on each end attach 1 clip to this neg pri coil terminal (the terminal not the wire you removed from it) and you touch the other alligator clip repeatedly to ground like Morse Code tap tap tap and with your other hand hold the coil to dist large wire (the dist end) 1/4" from a good ground while a helper holds the key to "start". W a charged battery of course if you get sparks that tells you that the ballast/coil/ign sw and their supporting wiring is good and that only leaves the ECU (& it's ground) and the dist pickup and their supporting wiring. The dist when rotating generates its own voltage to trigger the ECU which makes it (the ECU) ground the coil primary to collapse it's (coil primary) field which makes the coil secondary spark which goes to the dist to be routed out to the plugs. Holler back live every 24 hour block of time like it's your last day on earth

Re: No spark [Re: RapidRobert] #851998 11/13/10 06:23 PM 11/13/10 06:23 PM
Joined: May 2010 Posts: 219 Southwest way2fast OP enthusiast
way2fast OP enthusiast Joined: May 2010 Posts: 219 Southwest	Alright now what!! I replaced the Ballast resistor, the ECU, The Coil and the Distributor, Voltage regulator and the Cap and Rotor. The Fusable Link is good. checked and redid grounds....Where do I go from here??? Go Fast and Swerve!

Re: No spark [Re: way2fast] #851999 11/13/10 06:27 PM 11/13/10 06:27 PM
Joined: Jan 2003 Posts: 32,957 Grand Prairie,Texas stumpy I Win
stumpy I Win Joined: Jan 2003 Posts: 32,957 Grand Prairie,Texas	Instead of just replacing parts do the diagnosis necessary. Did you try the test above your last entry?

Re: No spark [Re: stumpy] #852000 11/13/10 10:48 PM 11/13/10 10:48 PM
Joined: May 2003 Posts: 15,487 Florida S scratchnfotraction I Live Here
scratchnfotraction I Live Here S Joined: May 2003 Posts: 15,487 Florida	if that baby has a keyed hot wire on the + side of coil with key on this is where I drop a points dist with a pertronix points conversion in it,with the 40,000 volt flame thrower coil unplug the ecu,jumper the BR for full 12 volts to conversion and ride sally ride but thats just me,I have not had a late 70s-late 80s mopar that was not done this way just for this reason done changed everthing and still no worky if i low on the cash I just drop in the reman point dist and remove the - side of coil and hook the points wire up and go has always fired up and ran every time after that I AM NOT SAYING....i am just saying... run what ya brung

Re: No spark [Re: stumpy] #852001 11/14/10 12:27 AM 11/14/10 12:27 AM
Joined: May 2010 Posts: 219 Southwest way2fast OP enthusiast
way2fast OP enthusiast Joined: May 2010 Posts: 219 Southwest	Quote: Instead of just replacing parts do the diagnosis necessary. Did you try the test above your last entry? did that..... no sparky. And everything on it was old so I went ahead and replaced everything and checked grounds and connections just to be safe, this is going to be my daily driver and I can't have it not starting at 0430 getting ready to go to work. Go Fast and Swerve!

Re: No spark [Re: way2fast] #852002 11/14/10 01:46 AM 11/14/10 01:46 AM
Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,041 Lincoln Nebraska	Quote: did that..... no sparky. do we have fire at the coil primary positive terminal w the key turned to "start". Last edited by RapidRobert; 11/14/10 03:42 AM. live every 24 hour block of time like it's your last day on earth

Re: No spark [Re: RapidRobert] #852003 11/14/10 08:27 PM 11/14/10 08:27 PM
Joined: May 2010 Posts: 219 Southwest way2fast OP enthusiast
way2fast OP enthusiast Joined: May 2010 Posts: 219 Southwest	Ok .... still at it pulled the ECU 5 pin connector to check voltage like the manual says and I don't have battery voltage at Pin #4 or #5 with key on or in start position... looking at the wiring diagram 4 goes to coil negative and 5 goes to the BR. should these show voltage at any point or is that for the 4 pin connector? engine turns when key is turned to start but does not fire. I'm learning to hate this truck Last edited by Way2Fast; 11/14/10 09:01 PM. Go Fast and Swerve!

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