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How do I check power and ground pulse to the injectors on 93 Chevy Cheyenne 2500

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You would use a noid light to check injector pulse.

Posted on May 08, 2017

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93 chevy cheyenne acks as if its out of fuel, or not getting fuel i've replaced fuel pump and filter, checked the jets whats next?


Does it try to start if you spray starting fluid into the throttle body ?
Are you getting power and ground pulse to the injectors ?

Dec 10, 2015 | Cars & Trucks

1 Answer

I have a 02 chevy silvarado 5.3 the injectors wont pulse


first make sure you have power to one side of the connector. the injectors are ground side controlled by the computer. If that checks out check to see if you have spark. If there is no spark than you may have a bad crank sensor.

Also, it may help to explain how you checked for pulse.

Sep 09, 2015 | Cars & Trucks

1 Answer

I have a 2001 chevy blazer ls 4.3 l 2 wheel drive and it has NO injector pulse . Ive replaced the distributor


have you checked for codes in the PCM to see if there is an injector code. first place to start. then check for power and ground at the injectors. if none then you will have to find were you have lost power or ground.

Jul 17, 2015 | Cars & Trucks

1 Answer

No injector pulse 4 cyl 93 f250 460


if you have a $5 test light, you could find the problem. just know that all eight injectors have a constant voltage applied to them anytime the key is in run or start. and also that 4 of the injectors share a common ground, they have their ground wires spliced together before the ground wire enters the pcm to be internally grounded. and the other four injectors are the same- their ground wires splice together. so your four that don't pulse have lost either the power to them, or the common ground wire for the 4 may have broken. or lost connection.

it is easier to check the power side first, so clip a test light lead to the negative battery post or cable, turn the key to on,and probe each injector connector. one of the terminals at all eight injectors will be the power wire, and it should light up the test light. if all eight injectors have power to them, you know it must be a ground side problem. if you find that 4 injectors have no power to them, look for a broken splice in the power wire to all injectors. back in those days, injectors were "bank fired". one side or bank of the engine all had the injector grounds spliced together, so all injectors on one bank fired (pulsed) simultaneously, and then the other bank was fired or pulsed. that was good until sequential injection matched the pulse to the cylinder ready to fire, more precise, and in the modern systems each injector ground has a separate ground inside the pcm. no more splicing of the ground wires, and having bank fired engines.


when the pcm grounds the circuit, the injector coil is energized and the injector opens to spray fuel out. so the injector has constant voltage to it. only when the circuit is grounded is that power applied across the injector.

Jan 22, 2015 | Cars & Trucks

1 Answer

I have fuel coming to the motor but not going in it for a 98 chevy cavalier


Check the fuse for the injectors. If you have a test light, check for power to the injectors with key on. Pull off one injector connector to check for power. 2 wires to each injector-one is the power wire and powered anytime key is on. The other is the ground wire going into the computer, where it is internally grounded for a split second to pulse the injector-fuel is then sprayed out.
If power circuit is good, test the ground circuit: clip a test light lead to the POSITIVE POST of battery. Insert tester probe into the ground terminal of injector-the one that has no power with key on. Now have someone crank the engine over: test light should be blinking.
If both tests work-steady power to injectors with key on, and blinking tester on ground terminal with engine cranking, then the injector drive circuit and the ground circuit is working.
Let me know what you find. Good luck.

Dec 11, 2013 | 2000 Chevrolet Cavalier

1 Answer

I have replaced the fuel pump on my 1991 chevy cheyenne im getting fuel to the injectors but they aint working


Check the injector fuse. With key on, injectors should have constant power available to them on one wire. The other injector wire is ground wire. With constant power to injectors, all it takes to pulse the injectors is for the computer to ground the injector ground inside the computer for a split second, and pulse occurs, causing fuel to spray out the injectors.
So if injectors aren't working, either the injector drive circuit (the power to injectors) or the injector ground circuit is lost. You can buy a cheap "noid light" at any auto parts store, and check the injector circuit. Just plug the light into the injector connector and crank the engine over. If the light is blinking, circuit is good. If no light, the circuit has a problem, either on the drive side or the ground side.
Here's a way to check the ground circuit separately. Use a test light clipped to the Positive battery post. Probe the ground wire terminal of the injector connector while the engine is cranked over. The test light should be blinking-meaning the computer is grounding the circuit normally and would be causing the injectors to pulse, if power is available to them.

Aug 19, 2013 | Cars & Trucks

1 Answer

93 astro van fuel injectors not spraying


Unless you have a clogged fuel line going into the throttle body, something got missed.
With the key on, can you ground one of the injectors and make it spray ?

Jul 18, 2013 | Cars & Trucks

1 Answer

My injectors arent pulsing on my 1989 k1500 suburban. I have 12 volt power to the injectors and have replaced the module in the distributior. Any one have an anwser for me


The injector ground circuit must not be working. What causes the pulse is when the computer internally grounds the injector circuit, power is passed across the injector solenoid terminals. All the injector grounds are spliced together on each bank of engine, and run into the computer. So, injector power, but no pulsing would seem a computer malfunction as long as the ground wires are good. Did you check all the injectors for pulse with the noid light, or at least both sides of engine?

Jan 23, 2013 | 1989 Chevrolet K1500

1 Answer

05 chevy aveo no injector pulse


At only 30,000? This is not good advertising for Aveo! At those no-pulse times, have you checked for power at an injector connector with key on? With a new ecm, I would not expect the injector ground circuit to be the problem, so maybe you could trace the injector drive circuit back from a wiring diagram. The injectors get power to them when the key is on. They only pulse when the ecm grounds them. good luck, ken.

Nov 26, 2012 | 2002 Nissan Sentra

2 Answers

'93 Chevy Cheyenne 4 WD uses excessive fuel (4.3 V6)


check for tune up
check for vacuum leak

distributor cap worn plugs worn

Jul 07, 2009 | 1993 Chevrolet K1500

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