Question about 1988 Jeep Wrangler

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Will not spark until ignition is turned off then moment ignition is is turned back it has one good spark

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You didn't mention engine size so this isn't a fix (most of my diagrams are terrible anyhow) but, when you are turning the key on and off you are doing the same thing that the distributor pickup does (causing the coil field to collapse and make a spark) On that basis, I'd check the coil pickup and anything along that line ...also make sure that the run side of the ignition switch is hot with the key on.

Posted on Oct 06, 2009

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Starts and runs good for15seconds then cuts off,Must wait to restart.


I have to ask? How long since a tune-up? Are there any applicable trouble codes?
As far as spark at the spark plugs, check the ignition module. Check voltage to ignition module with key on, pink wire with black tracer. If no voltage, check fuse circuit, fuse 6--20amp in relay center. Not only check the fuse, check the fuse circuit for voltage.
During cranking rpms, it is the ignition module that controls spark, but, it has to see rpm signal, which comes from crank sensor. At the moment, I can't be positive which component or exactly where the fault lies.
To reply, click on comment link.

Apr 12, 2016 | 1992 Buick LeSabre

1 Answer

Got 86 Toyota pickup 22r getn no spark changed igniter,coil, plugs, and wires and did inline spark test still no spark need help!!!!


Sounds like you have concentrated on the HT items.
Time to go back and check out the LT circuit from the ignition switch through to the points in the distributor.
disconnect the feed going to the coil from the ignition switch. Switch on the ignition and 'flash' the lead to earth (ground)
You should get a healthy spark you would expect from the battery. If all is OK switch off the ignition and reconnect the lead. Remove the distributor cap. Worth checking the spring loaded carbon brush in the top of the distributor cap at this stage
Rotate the engine until the points are closed. Switch on the ignition and with a small insulated screwdriver open and close the points, a healthy spark should be seen every time you open the points. Check the condition of the points while here to make sure there has not been an excessive build up due to arcing, Clean or renew if necessary, Some distributors are fitted with a capacitor near the points - these can break down in time and always suspect.
If the spark across the points is good get a friend to turn the engine over while you watch the points. A good spark should be seen every time the cam opens the points. Clean the corrosion from the rotor and the segments on the distributor cap.
Sometimes the points are badly adjusted and prevent a good spark or the heel that runs on the cam gets badly worn.

Jan 16, 2016 | Toyota Cars & Trucks

1 Answer

2005 vw caddy no ignition lights, wont turn over


Go back to basics. Spark at plugs? Correct fuel pressure? Injector pulse present? Using a small amount of starter fluid does it start for a moment?

Feb 05, 2015 | Cars & Trucks

1 Answer

Car won't start


There are three basic items that make a car engine run - ignition, fuel and timing/compression. If any of these are missing or bad, the engine wont start.
To check for ignition, pull out a plug wire (any one) and place a metal object such as a smallish screwdriver into the plug cap, hold the metal part of the object near a metal part of the engine then have someone (the trouble and strife will do) turn the engine over.
If the ignition is OK, a nice blue spark should pop from the metal object to the engine. Keep your hands away, the spark reaches upwards of 26 000 volts, not enough to kill you, but it can spoil your moment.
To check for fuel, remove the fuel line from the carburettor and turn on the ignition for a second. A good stream of petrol should spurt from the pipe if you have an electric fuel pump, otherwise crank the engine to let the mechanical pump work.
Finally, check for compression. Remove a spark plug, block the plug hole with a finger if possible, then have someone crank the engine. The compression should attempt to blow your finger out of the hole. Compression is dependent on good timing. If the compression is bad, you could have a broken timing belt, a blown head gasket or a number of other nasties.

Jul 31, 2014 | 2004 Nissan Sentra 1.8

1 Answer

Will not start but turns over


Check if security light is on, if so, must reset. To reset, put key in ignition and turn to on position. Security light will start flashing on and off. Leave key in on position until security light stops flashing and turns off completely. This will take approximately 10 minutes. Then turn key off and take out of ignition. Put key back in and start car. Should now start

Jun 29, 2014 | 2000 Saturn SL

1 Answer

Trying to figure out what the name of a part is


That would be the ignition coil, the part that creates spark at the spark plug. If you follow the electrical path from the coil wire to the distributor cap, and from there, the spinning rotor just under the distributor cap carries the path from the coil wire at the cap's center to the spark plug wires around the dist. cap, and through the plug wire to the spark plug.
The high voltage causing the spark is created in the ignition coil by the engine computer at the precise right moment signaling an ignition module to cut 12 volts current to the ignition coil. This causes the coil to internally build up high voltage which is passed through the coil to distributor cap wire. The computer knows the precise right moment to initiate spark from engine sensors, primarily the crank position sensor and the cam position sensor.

Nov 06, 2012 | 1999 Dodge Durango

1 Answer

I started my truck up this morning and let it idle as always everyday and all of a sudden the engine turned off like if someone fliped a switch or something...checked for spark at the coil and found no...


Your fuel pump runs for a few seconds when you turn the ignition is turned on because the fuel pressure naturally eases off when the engine is stopped, it runs until it gets to>< 30PSI and kicks off. This is normal, you know that fuel is reaching the injector line. On some engines there is a solenoid that has to trigger before fuel can go into the fuel lines for the injectors. If this solenoid isn't firing the computer will detect it and shut off the ignition. Look for some kinda solenoid or gadget where your fuel line come up in front of the fire wall. It should be close to where the fuel line splits off to go to each bank. Hope it;s a wire come unplugged and easy fixed. dhgill1949

May 22, 2011 | Chevrolet Silverado 1500 Cars & Trucks

4 Answers

There is no spark thus car won't start. the battery is fine, it turns over good, it is not flooded, the spark plugs are new, the ignition coil was just replaced, what else controls the spark


The Crankshaft Position Sensor and the Ignition Control Module also control the spark. It depends on whether your vehicle is equipped with the 2.2L engine or the 2.4L engine as to where these components are located and what they look like.

Jan 29, 2011 | 1996 Chevrolet Cavalier

1 Answer

2000 montana 3400 engine,code p302 number 2 cylinder,replaced module,,one coil,new plugs,and wires.Miss occurs,then will clear,and come right back,compression good,spark,and injector pulse good.Sometimes...


ignition control module, throttle position sensor and other sensors need to be tested to establish problem, any codes from OBDII ? check engine light staying on ?

Jul 04, 2010 | 2000 Pontiac Montana

1 Answer

Won't crank


Hi,

I am assuming that the engine is cranking (turn over) but will not run.

Most gasoline engines would need only two (2) elements to run; fuel and ignition (spark) at the right moment. Based on your post, "not appeared to have jumped timing", it would then be assumed that the "at the right moment" (at least for the spark) is good. Next to check then would be for the presence of spark; this could be performed by removing one of the spark plugs, reconnecting the said plug to its wire, let it rest on any exposed metal and crank the engine. There should be a pulsating spark at the end, if yes then problem is most likely elsewhere, if none, then next to check (depending on the engine type) would be the:
  • high tension wires;
  • distributor;
  • distributor cap;
  • rotor;
  • ignition module;
  • ignition B+12.
If there is spark and yet would not run, then the fuel delivery to the engine has to be checked. There are two checks on the injector:
  • electrical - pulsating +12 on each of the injectors while cranking;
  • fuel spray - you need to remove all and check if each will spray fuel (while cranking). For safety reasons, pls have several disposable containers ready to catch the fuel, paper towels or rugs to wipe/clean off any spilled raw fuel. If yes, problem is elsewhere, if not and no pulsating +12 while cranking, ECM wiring or connector, if there is pulsating +12 yet no fuel spray, then defective injectors or defective high pressure pump.
In some instances, it could be the alarm/security/immobilizer acting up which prevents the engine to run.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Aug 02, 2008 | 2002 GMC Safari

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