Fuel injector problems?

Hi gatordog, Welcome to 2carpros and TY for the donation.

Check the injector fuse if okay get a noid lite and hook it up to the injector harness it should be flashing if not could be the injector ground drivers/input power If its flashing test the injectors

[quote:8af70ba3cd="rasmataz"]Hi gatordog, Welcome to 2carpros and TY for the donation.

Check the injector fuse if okay get a noid lite and hook it up to the injector harness it should be flashing if not could be the injector ground drivers/input power If its flashing test the injectors[/quote:8af70ba3cd]How do you test the injectors?

Unplug the injector and use and ohmmeter and measure the resistance on the injector terminal and check if the injector resistance is within specs.

i replaced my intake gaskets on my 1994 chev k1500 with an 350 k motor with TBI. The motor is running great but since installing the new gaskets both injectors are making a very loud pinging noise. Any advice for me?

If you would get a can of seafoam and put it in the gas tank next time you get gas it may be that they are dirty. Let me know if that helps. If not then I will need to know if you have a timing light ok.

injectors in throtle body not shooting out fuel. what controls the opening and closing of injectors?

Hello, are there any codes? How's the fuel pressure? With the engine cranking, is there any spark at the plugs? The B+ to the injectors goes hot when you turn the key on, the computer switches the ground to control.

When I turn the key on the injectors spray fuel non stop. Cannot get my OBD 1 and 2 scanner to read my truck. Help please.

The one of the injectors could be shorted please unplug them and see if it stops, then plug one in at a time to see what happens.

Please let us know what happens.

Best, Ken

Electrical problem V8 Two Wheel Drive Automatic 216k miles

Hi, yesterday my truck would not start. I am getting spark, but no fuel is spraying from the injectors. I removed the fuel line feeding the TBI to check and see if fuel was reaching it, and it is. Not a lot of pressure but it is getting fuel. The TBI is a brand new Holley 670cfm that was working flawlessly up until the no start. The engine has been rebuilt but no problems to speak of until this. Fuel pump is the original so maybe its time to be replaced? Checked the fuses I could find in my diagram and they are all good, wiring looks sound going to the TBI and injectors. Just don't know why the injectors aren't spraying any fuel after trying to start multiple times.

Thanks in advance!

What you need to do here is check the actual fuel pressure with a fuel pressure gauge designed for your fuel system

Here is a guide

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator


if okay-check for power to the injector/s-got power still no pulses-could mean the computer ground drivers has gone bad

Here is a guide

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

Check out the diagrams (Below)

Please let us know what happens.

Cheers

Checked fuel pressure to TBI, its sitting at 13 There is power going to the injectors, what else would cause this problem?

psi.

New thought, I recently had a car security system installed, could this have somehow caused a problem so suddenly a week after installation?

If it has to do w/the security system it won't last a week. Hook up a noid light to the injector and see what happens-if its not blinking its not pulsing could be the computer ground drivers -or the computer is missing an ignition reference signal from the cam/crankshaft sensors therefore not synchronizing the injectors.

Hard starting for past couple weeks until not starting at all. No fuel coming from injectors. Fuel pump 2 years old. With ignition turned on, pump makes whirring sound. pump ok. Fuel filter changed last week. Today I changed both injectors, fuel pressure regulator kit, and pump relay. Afterwards I attached each injector electrical connector with a test (noid) light and cranked the engine over.No light flashes on either one. The book said then you need to look at the ECM, so I replaced it. Still the same result.

I don't have a noid light and its a too late to buy one today, but I threw a voltage meter on it and only saw constant current when the motor was cranking, no pulsing, then again the meter probably isn't fast enough to see the pulses. I guess i'll pick one up tomorrow. Thanks much for the help so far!

what is the exact fuel pressure??

the distributor send a signal to the ecm to toggle the injectors.

Roy

Hi again, tested injectors with a light and its not blinking at all on either injector. Checked for codes and its showing code 12 (No Problems detected). So I replaced the ECM and the truck started it was bad. Thanks for your help

I do not know the exact fuel pressure.

I have a 1993 Silverado that has don that more than once. In each case it was the Distributor. I bought a dist at Auto Zone with a lifetime warantee and they have to replace it about every 2Yr. You will think it is a fuel system problem but it is not. I have had this problem on another 1993 chevy custom with a 350 engine 2 times and my own at least 4 times hope this helps.
Keeps AAA in the Rollback business too ha ha

I don't follow your comment about the distributor sending a signal to the ecm

Test the pick-up coil in the distributor that's the one that synchronizes the injectors

I have a 93 Chevy Cheyenne 1500 4.3l v6 tbi about a
month ago I was driving down the road and my truck just
died I pulled over looked under the hood realized one of
my injectors wasn't fireing off so went to autozone got 2
new injectors still nothing so I got it home from a buddy
with a trailer I replaced the distributor and was able to
drive it it drove fine for about a day then I took it on the
highway and it started to loose power by the time I got to
work couldn't go over 35 mph so tried timing it and
nothing when the truck is idling it surges up and down
and it will barely move now please help