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Thomas Pryde Posted on Aug 28, 2018
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How is cdi high voltage dissipated if no spark plug in circuit

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Roger Paull III

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  • Expert 318 Answers
  • Posted on Oct 14, 2018
 Roger Paull III
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It's shorting out somewhere, the spark is strong enough to jump and short itself out, look for the spark jumping at night with no lights on.

4 Related Answers

Anonymous

  • 156 Answers
  • Posted on May 05, 2008

SOURCE: Model Pan TH50PX75U Purchased May

By any chance do you have the circuit city extended warranty?
If not you gotta act quick on this its less than a year old... DEMAND a replacement TV of the exact kind or equal to the value you originally purchased from Circuit City... Now listen your going to have to call Circuit City Corporate 1-800-843-2489 its going to take time on the phone... but if your persistent they will give you a new TV "Been there done that" I also return stuff without receipts and only because I make a stink about it do they do it... be mad... Tell them you'll never purchase from them again if they can't make this right for you... Thats an expensive TV do you think they want you telling people "DON'T BUY from them. Try this once you get a real person on the phone lol a representative say "Hello I'm offering circuit city the opportunity to keep me as a valued customer... and tell them how its going to be or Best buy will get the sales on TV/Electronics from now on.

Companies will bend over backwards to keep a customer... its easier to make an old customer happy on a single occasion than to make a new customer happy on his 1st purchase ever.

Last thing I got in the mail was a manuf coupon for "Free Battery of any type"
because my battery went capute after like 1 1/2 years in my truck.. so I told the company if they ever wanna sell me another battery they need to make up for this one.
My original battery was only $59.99 but I got the best one it was $149.99. They were smart to do that because now I'll stick with them and recommend them.

Don't feel like doing any of this just take it to a repair place and attempt to collect on the limted 1 year warranty from Panasonic.

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Anonymous

  • 125 Answers
  • Posted on Jun 15, 2009

SOURCE: 1987 Honda shadow vt1100c no spark at any plug

The voltage on the coils is present except at the instant of firing. The interruption of the voltage is what causes the coil to fire. The cdi box is what causes the voltage interruption.
The interruption is very hard to detect. You are not the first to be stymied by that box. If you have access to an oscilloscope, I think you can see the pulse if it occurs.

SpectreWriter

  • 8 Answers
  • Posted on Nov 23, 2013

SOURCE: bike has no power after replacing cdi/spark plug/voltage regulator and spark plug coil

Check the magnetos, assuming the mofrl has them.

Vernon Taylor

  • 7446 Answers
  • Posted on Jan 03, 2018

SOURCE: 11 different codes..fuel pump circuit,map sensor high voltage during ignition and low in idle, electroic spark timing circuit open/shorted

So many codes/so many faults all at once makes it seem like some disaster has befallen your car.

I suggest you erase all the codes and see how many come back after the engine has completed a complete warmup/cool down cycle.
Often fewer codes will return and it is only those that do return you need to check out.

So many faults suggest maybe the ECU is telling lies and could be faulty but replacing it is a last resort so the other stuff needs checking thoroughly and systematically first. Use a good scanner to examine live data and verify every diagnosis before spending any money.

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Related Questions:

0helpful
1answer

How is high voltage dissipated if no spark plug in circuit

The voltage will either jump from the spark plug cable to ground or flow backwards into the primary windings and blow out the ignition module.
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Why would my coil pack get hot then crack

excessive voltage applied
find the reason for that uncontrolled voltage
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Cana elite 50 scooter run without CDI box

no!
CDI MODULES (IGNITORS)
What is a CDI module? A typical CDI module consists of a small transformer, a charging circuit, a triggering circuit and a main capacitor. First, the system voltage is raised up to 400-600 Volts by a transformer inside the CDI module. Then, the electric current flows to the charging circuit, charging a capacitor. A rectifier inside the charging circuit prevents the capacitor from discharging before the ignition point. When the triggering circuit receives triggering signal, the triggering circuit stops charging the circuit, allowing the capacitor to discharge rapidly to the low inductance ignition coil, which increases the 400-600 V capacitor discharge to up to 40 kV at the secondary winding. This 40 kV then jumps the spark plug gap. When there is no triggering signal, the charging circuit is reconnected and starts charging the capacitor again.
Mar 25, 2015 • Motorcycles
1helpful
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Does cdi affect ignition in pulsar 150

yes the cdi is most importing.the starter coil supply electricity to cdi then cdi forward electricity to high tension coil,and high tension coil forward the electricity to spark plug,spark plug give more fire to piston.cdi not only supply only electricity,cdi adjust the electricity and control the power.ok?
0helpful
3answers

Honda crf450 no spark atall plenty of power out of stator changed cdi nd had coil checked all ok tried dissconecting kill switch to.

maybe get a new spark plug.make sure your grounded(earthed). did you take the plug out and check for spark against the motor while you cranked the bike over?
0helpful
1answer

The bike runs well but lacks power above 4000 rpm. what gives?

dirty air filter,fouled spark plugs, bad spark plug caps, weak coil, dirty high end circuit in carburetors, possible bad pulsar pick up or cdi box. start withe the least expensive fixes and work your way up. good luck
1helpful
1answer

1987 Honda shadow vt1100c no spark at any plug

The voltage on the coils is present except at the instant of firing. The interruption of the voltage is what causes the coil to fire. The cdi box is what causes the voltage interruption.
The interruption is very hard to detect. You are not the first to be stymied by that box. If you have access to an oscilloscope, I think you can see the pulse if it occurs.
0helpful
1answer

No spark on Hyusu

Hi and welcome to FixYa,

For a "no spark" problem with a Hyosung RX125, check:
  • temporarily disconnect the battery. With the engine on at both the ignition switch and engine kill switch, verify that the green wire to the CDI does not measure 0 ohms to ground;
  • if it does, check the ignition switch and the engine kill switch;
  • it it measures anywhere between 50 ~ 500 ohms, then reconnect the battery and check that there is +12 on the orange wire going to the CDI with ignition switch on;
  • for a pulsating voltage (high ACV) at the white / blue wire coming from the CDI going to the ignition coil;
  • for a pulsating voltage (low ACV, 0.5VAC) at the green wire coming from the pulser coil going to the CDI; and
  • of course, check if the CDI (black / white) is connected to the ground.
Postback results of tests.

Good luck and thank you for using FixYa.
4helpful
2answers

No spark

Hi and welcome to FixYa,

To my understanding, the problem is 'no spark' yet the engine cranks. Generally, to consider are:
  • pulser coil (least likely);
  • ignition coil (likely);
  • interlocks (likely);
  • CDI (most likely).

Offhand, the CDI would be the main suspect. Since the CDI is sealed, it is not possible to do component level checks. The only way to check if the CDI is good is to check the external connections; if they are good and yet no spark, then the CDI is bad.

How to check the above:
  • to check the pulser coil, measure the low voltage coming from it using an analog/needle type AC voltmeter. While cranking, it should show a flickering low voltage;
  • to check the ignition coil, use a continuity tester. Primary should measure 3 ~ 5 ohms while primary to the high voltage end would measure 15 ~ 18 kilo ohms;
  • the ignition coil has 1 terminal connected to the IGN +12 while the other terminal is connected to the CDI. This should have a pulsating voltage when cranking.
  • all the interlocks could be checked with a continuity tester. Please note that most interlocks has a diode connected in series with their wires.
The interlocks include:
  • clutch switch;
  • side stand switch;
  • neutral light switch.

Good luck and thank you for using FixYa.
0helpful
1answer

No spark

There are a # of things that can take your spark out, first I would see if you have power to your ignition coil (100V+). If none there you need to isolate your ignition switch (unplug it or take it out of the equation) and jump your starter solenoid manually or try pushstarting the bike. If still nothing check for voltage going into your CDI box, if none check for voltage out of your stator (over 100V) and your trigger or pulse coil (over 3V). If you find voltage at the stator and not the trigger replace the trigger and vice versa. If there is voltage for both replace CDI box (but be cautious to verify good ground for CDI box and ignition coil). If you find voltage out of your CDI box (over 100V) replace your ignition coil. Good luck!
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