Question about 1988 GMC Jimmy

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How do you test a GM Ignition Coil for Spark and if it is strong enough

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The way to test this coil is to remove a spark plug wire and put a screw driver into the boot put the screw driver 1/4 inch away from bake metal crank over the engine if it has a blue spark it is ok. The most common problem on these coils is not the coil itself but the rotor button in the distributor cap so repace the distributor cap first if you have a problem with it running. you also need to use dielectric greese on the boots of the plug wires so they will not arc out against each other. yo test the coil you need a ohm meter and need to test the primary ans secondary windings with ohm meter, do you own one if so let me know If you need more help post a reply here.

Posted on Sep 30, 2009

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Posted on Jan 02, 2017

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1993 gmc pick up 1500 fuel pump works but nouthing at the injections and no spark at the plugs


Is there a tach place on the distributor cap? If so, use a test light on that terminal, engine cranking, see if the lite pulses? A pink wire should carry voltage to coil or distributor cap. It goes got with the key on? Use a test lite and check for voltage. A couple of possibilities, check the ignition module and pickup coil in distributor. Does the distributor rotor turn when you crank it? With gm bypass ignition, it's the ignition module that controls spark during cranking rpms, not the computer.
There is an oil pressure switch in the fuel pump circuit, so once you crank it enough to bring up oil pressure and that switch closes, the fuel pump will run even w/o a rpm signal, but, for other components, the rpm signal is important.
The ignition module gets signal from pickup coil, engine cranking, then ignition module sends rpm signal to computer on purple wire with white tracer. If no signal, the computer won't ground the fuel injectors, among other issues.

May 13, 2018 | GMC Cars & Trucks

1 Answer

94 gmc c1500 4.3 no start, engine turns over, got gas but don't have. everything in thge ignition is new, got power at the coil


Place a spark plug tester in your number #1 ignition lead and confirm spark.- No spark = possible ignition module failure if spark from coil is present.

Test the fuel line pressure for 12 PSI.for throttle body fuel injection systems on 1987 to 1995 - If reading is low replace fuel pump. If reading is zero lbs check relay.

Compression test for acceptable compression.

If you have spark, fuel and compression, static time the engine and try again to start the vehicle.

PS: If your vehicle is a standard shift you have a clutch safety switch and a column mounted ignition switch that should also be considered.

Here is some more info that may help:


How to Test the Fuel Pump on GM TBI Fuel Systems How To Check Engine Compression GM 3 5L 4 2L

Aug 12, 2017 | GMC Cars & Trucks

1 Answer

Truck will not start


remove coil wire at distributor and plug a HEI GM tester spark plug to see if spark at ignition coil if not test ignition coil for current and signal not short to ground

Apr 10, 2014 | 2000 Chevrolet Silverado 1500

2 Answers

It turns but it wont start,it has gas and power


Pull off the coil ignition cable at the distributor and check for spark coming out of coil when cranking engine over. Use a heavy rag or glove to hold the wire 1/4 inch from a metal ground. Should see a strong blue spark when cranking to verify ignition is good. If no spark, check for battery voltage to coil on the coil primary. If you have current to the coil, suspect a bad coil, ignition module, crank position sensor, or cam position sensor, or pcm. The coil, ignition module, and sensors can be tested before replacing.

Jan 29, 2013 | Cars & Trucks

1 Answer

I have a 97 pontiac grand prix and it will turn over but it wont start. i've had it look at my a couple mechanics and they said it wasnt my fuel pump maybe its the coil pack, so i buy a new set of


Learning how to test a GM distributor less ignition system rather then guessing an replacing parts is the proper way to diagnose . Pulling a couple of pull wires of the same coil an having someone crank the engine over to see if there is spark would the first test . If there is no spark ,could be the ignition module , or the crankshaft postion sensor .
GM 3 8L Ignition Control Module And Crank 3X 18X Sensor Test

Jan 03, 2018 | 1997 Pontiac Grand Prix

1 Answer

There is no power going to spark plugs why? and how can i check the ignition coil?(the ignition coil and the alternator{ part which all cables for spark ploge out from it} are new) car not started there...


You can test coil by pulling coil wire and holding close to a grounded source while someone cranks the car (wear gloves strongly advised). The only way to test an alternator if car is not running, is to take alternator off & bring to a parts store to have them bench test it.

Mar 27, 2011 | 1989 Mercedes-Benz 190

1 Answer

What should a multimeter read on a continuity test on the coil packs? i'm getting 1.9,1.7,1.7


The multimeter can read the resistance and if it is not open or shorted out, I'd say that your readings are in the normal range, comparing each resistance with each other + or - 10%.

I looked up the resistance readings on my online resource, but they did not list it specifically.
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I looked up the following on autozone.com:

There are 3 dual-tower ignition coils that are part of the ignition control module (ICM). The ICM contains coil driver circuits that command the coils to operate. The Powertrain Control Module (PCM) controls each dual-tower ignition coil by transmitting timing pulses on the ignition coil control circuit to the ICM for the proper coil to enable a spark event.
  1. Inspect the spark plug wires for proper orientation.
  2. With the ignition OFF, remove the fuel pump relay.
  3. Crank the engine and test for a strong spark on each cylinder spark plug wire using a suitable spark plug tester. Ground the companion cylinder spark plug wire of each cylinder when it is tested.

    If a strong bright blue spark is present on all of the cylinders, remove and inspect all of the spark plugs for proper torque, proper gap, wear, damage, and fouling. Replace the spark plugs if necessary. If there is no spark on any of the cylinders, test the ignition voltage circuit of the Ignition Coil Module (ICM) for an open/high resistance or short to ground, or test the ground circuit of the ICM for an open/high resistance, or a faulty ICM. The wire circuit resistance should measure less than 3 ohms. If there is no spark on any of the cylinders, or spark is weak or intermittent, test the IC circuit for an open/high resistance, or a faulty ICM. The wire circuit resistance should measure less than 3 ohms. If spark is present on one or more of the cylinders, inspect and test the spark plug wires for arching, cuts, rubbing on other components, and proper resistance. If all tests are normal, then the system is operating correctly.
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Oct 08, 2010 | 2000 Chevrolet Venture

1 Answer

No spark


You'd need to track down a wiring diagram to be certain, but usually the power feed for the coil comes direct from the ignition switch contacts. If you take the steering column shrouds off and measure the resistance across the switch contacts that supply the coil, there should be very little resistance there. If there is more than a few ohms it's best to replace the ignition switch. Also check the power supply to the switch and compare with power out, if it drops a lot, then the switch is at fault (might be easier to do this than measure resistance).
Hope this helps, Mark

Dec 02, 2008 | 1994 Mazda 323

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