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93 astro van fuel injectors not spraying

Every thing works fine we have pulse to the injectors. checked by using a noid light, we have pressure

Posted by Anonymous on

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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polarcycle
  • 1392 Answers

SOURCE: no injector pulse, no current to the injector

Check the pickup in the distributor as this is the cam sensor. The injectors run of the pulses created while the rotor is turning around. It should be a plastic disk located under the rotor button.

Posted on Mar 13, 2009

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SOURCE: 03 SATURN VUE 2WD DIED WHILE DRIVING

crank sensor is bad

Posted on Jul 21, 2009

  • 44 Answers

SOURCE: Fuel injectors not opening on my 5.0 Ford f150

If it ran before sitting 2 years it can run again ok...but...
if it will not now start as you say then it is only one or two things...it is not getting gas into the engine or the plugs are not getting spark correctly. Take one of the plugs out or use one of the old ones and connect to one of the wires with the plug held against ground (sheet metal or engine metal) while someone cranks the engine. You should see spark jump across the plug. If you get spark then you know that is ok. Since you replaced the distributor does that mean you took the distributor completely out of the engine. If so then you probably have the timing off and you may need to rotate the distributor a few degrees one way or the other to get it to run. Also recheck your plug wires to make sure that you have the correct order of the connections from the distributor to each plug. You said you sprayed starter fluid in the throat. That should make the engine try to start if you are getting spark ok. If it trys to start and actually starts running ok but then quickly dies then you know you are getting power to the plugs ok but that the gas is not continuing to flow into the engine so that is the thing to concentrate on. Go rest, have a beer, or watch TV or something for 1/2 hour to let things normalize on the truck and any flooded gas seep away. Then squirt some more starter in the throat, get in the truck stomp the pedal maybe 4 or 5 times. Then hold the gas pedal to the floor...do not let up on it or pump it...and crank the engine. It should sputter, jump and finally run. If not you can try this procedure maybe 3 more times. By then if it will not run then you probably have flooded it. So then do not pump the pedal at all but each time you try to start it merely slowly push the gas pedal to the floor and hold it there while you crank. That will relieve any flooding and hopefully it will start and run. If your timing is off though from the work you did on the distributor you may need to get that set close to the correct position before it will run well. I guarantee that if it ran 2 years before then it will run now. Also, take a look at the air intake filter...mud dobber wasps like to get in there and build nests. Try leving the air filter completely out until you get the engine started and running ok. While you are at it, look carefully at some of the wiring in the engine compartment...the small wiring stuff that goes to the distributor etc. I have seen where mice get hungry in the winter and actually chew off the insulation and even cut the wire...so look around...sounds silly but I have seen where I had to splice wires and recoat some with insulation where the mice have done their thing.

Posted on Aug 22, 2009

dnewcombe1
  • 1564 Answers

SOURCE: I have a 93 Chevy G20 VAN G20 with a 4.3L engine

There are three relays all grouped together on the firewall on the passengers side. All three are related to your situated. We can eliminate one of them because you stated that the fuel pump is operating fine. Now that leaves the relay for the ECM(engine control module) this tells the injectors, cold start and run, when and how much fuel to supply and also controls ignition timing and spark advance. The third controls the AC compressor. Now I've got to remind you that I started working on fuel injection systems the day they started failing here in the US around 1972.These were such vehicles as Mercedes, Saab and Volvo. I've worked on every configuration, TBI, MPI, diesel etc.etc. I may on occasion cross one fact with another or mispronounce certain aspect of a system however, These three injectors are where you want to concentrate your efforts. With some finnesse you can swap the harnesses from one to another. If your car runs fine and your AC suddenly does not, then you know that that relay is faulty. Do this until you get your answer. Best of luck my friend, Dana

Posted on Aug 31, 2009

dttech
  • 4803 Answers

SOURCE: vehicle came in for check

A misfire at idle that smooths out at cruise is ALMOST ALWAYS caused by a vacuum leak. Take a hard look at your fuel trims at idle. If the Bank 2 Long Term Fuel Trim is more than + a couple points higher than the Bank 1 trim, your problem is most likely a vacuum leak. If the Fuel Trims even-out while holding the engine at 2000 RPM for about 20 seconds, then a vacuum leak is DEFINITELY your problem. I would suspect a leaking lower intake gasket leak because an upper plenum leak will normally affect all cylinders.

Posted on Jan 30, 2011

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1993 gm 3800 left bank disconnecting of plug wire and injection connector does not change idle, appears left bank is not working.. Compression good...


Did you test for spark? I would check spark and fuel pressure. OK, here's a little bit of working theory that'll help you to see the ‘why’ of the Noid light test.

Whether you're testing a No Start Condition or a Misfire Condition, you'll need to know if the cause of the problem is a lack of fuel. When your GM 3.8L (Buick, Chevrolet, Oldsmobile, Pontiac) does not start, it will be either because of a lack of fuel or spark. The same thing goes for when your GM 3.8L equipped car or mini-van is misfiring... that specific engine cylinder isn't contributing to engine power because it either lacks fuel or spark.

Now, since the above two conditions (No Start and Misfire) can be caused by any number of things... one of the things that has to be eliminated, from this list of possibles, is the fuel injector not getting power or the injector pulse signal (On/Off switching signal) from the vehicle's Computer.

This is where the fuel injector Noid light test comes in handy, because you're able to visually see if both of these signals are present or not. If no flashes, then now you know that you have to verify that the connector is getting power (12 Volts) and the injector pulse signal.

One thing to keep in mind, is that the fuel injector Noid light test does not test for a BAD fuel injector. But, is the first step in verifying if the fuel injector is BAD or not. For the fuel injector test tutorial.

May 07, 2017 | Cars & Trucks

1 Answer

GAS GETTING THREW THE THROTTLE BUT WONT COME THREW INJECTERS


First understand how the fuel injector circuit works that causes them to spray fuel out, then you could probably find the problem. It's really simple, the key thing is that the hot wire to the injector (there are only two, a power wire and a ground wire) is always hot anytime the ignition key is in on, or run, or start. It is a fused circuit that is powered on when the key is on. The fuse is either in the distribution box under the hood or in the instrument panel fuse block.

The ground wire from the injector goes into the computer where it can be internally grounded inside the pcm for a split second. This is what causes the "pulse" of the injector, a needle is raised electromagnetically, and fuel under pressure is sprayed out. The computer can vary the pulse width, by duration of ground time, and really fine tune the gas metering.

Check for power at the injector connector with key on. If nothing, check the injectors fuse, and trace it back to the ignition switch. If there is power on the hot wire, one way to further test the circuit is to go buy a cheap "noid light," a tester at any parts store-different sizes, but easy to find a standard for gm vehicles. A noid light checks power and ground wires at the same time. Now that you understand "pulse", a noid will blink as if it were being pulsed-well it is, just that. Hook it up to an injector connector, and the engine has to be cranking over-that is when the computer is grounding the circuit repeatedly-when the engine is running and when it is cranking by the starter. If the noid light blinks, the circuit is working correctly. If the light doesn't turn on at all, first verify that the power wire has power with key on. If it does, problem may be in the ground side of the circuit, or in the pcm itself.

Mar 30, 2014 | 1991 Chevrolet Caprice

1 Answer

I have a 2000 astro van with a 4.3 it blew a intake gasket so I replace the gasket also the roller lifters in it.Now I have got it back together it cranks but it's dead on 4,5,6,cylinders I check it's not...


Sounds like the injectors may be bank fired-they all pulse at same time on each side or bank? If they are, all three grounds for the injectors will splice together and enter the computer on a single wire. So if you have battery voltage to the injectors, be sure and check the ground signal. You can check the pulsing with a noid light. Or if you use a test light, clip the test light lead to the positive battery post, and put probe in the ground side terminal on the injector connector. When engine is cranking, the test light should be blinking-meaning the ground for that injector is working.

Aug 16, 2013 | 2003 Chevrolet Astro

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

Van cranks but wont start


Hi there:
You wll have to pinpoint what the engine is missing...
- Spark
- Fuel
- Compression

All three of these are tested when the engine is being cranked over. There are two way of checking for fuel. Fuel pressure and fuel trigger. Both are very important and must be present for the engine to start. Fuel pressure is self explanatory. You just hook up the gage and see what the reading is. Fuel trigger is check with a noid light. The injector gets unplugged and the noid light gets plugged in to the injector clip. With the engine cranking over, this light must blink. This is the signal to the injectors from the computer. You can have all the fuel pressure in the world, but it wont matter if the injector is not pulsing gas into the cylinder like it should.

Compression tester, spark tester, fuel pressure gage and noid light are all accessible at your local auto store. All three tests play a very important part in diagnosing a no start condition. Be extremely careful when doing these tests.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Feb 09, 2012 | 2000 Mazda MPV

1 Answer

Why my van cranks but wont start


Hi Fabio:
Some check engine or anti-theft light there? We will have to pinpoint what the engine is missing...
- Spark
- Fuel
- Compression

All three of these are tested when the engine is being cranked over. There are two way of checking for fuel. Fuel pressure and fuel trigger. Both are very important and must be present for the car to start. Fuel pressure is self explanatory. You just hook up the gage and see what the reading is. Fuel trigger is check with a noid light. The injector gets unplugged and the noid light gets plugged in to the injector clip. With the engine cranking over, this light must blink. This is the signal to the injectors from the computer. You can have all the fuel pressure in the world, but it wont matter if the injector is not pulsing gas into the cylinder like it should! Compression tester, spark tester, fuel pressure gage and noid light are all accessible at your local auto store. All three tests play a very important part in diagnosing a no start condition.

Also, keep in mind that CKP sensor could be failed; scanned the PCM for fault codes stored.

Hope this helps.

Jan 31, 2012 | 1996 Chrysler Town & Country

1 Answer

My 95 buick lesabre will not start , I have change to a new fuel pump and a new cam shaft sensor. The gas is getting to the fuel rail, I have spark on all six cylinders . If i spray gas in through the mass...


Thee are a couple of things left to check. One is to hook up a fuel pressure gauge to the fuel rail and see how much pressure your getting and compare it to specs. It maybe getting fuel there but not enough pressure. To see if the injectors are being pulsed you wil need a set of noid lights. You will unplug an injector and plug in the noid light. It will flash everytime that injector is pulsed. If it never flashes your injector drivers on the ecu are bad.

Sep 20, 2010 | 1995 Buick LeSabre

2 Answers

Need help with this 93 astro van


Have you checked for injector pulse with a noid light at the injector connector? You could have a bad ecm.

Aug 12, 2009 | 1993 Chevrolet Astro

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