Checked Fuel Pump and filter both fine, checked plugs for spark,engine fires when fuel spills into the tbi intake, but the injector wont spray, checked fuses in box all look good. I bought a new injector and swapped it out but it did nothing. I don't have a noid light to check injector connector but i do have a digimultimeter just unaware of what settings to use... Heard of an ignition module?? could this be a potential cause, or other fuses or fuse wires?
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Re: Fuel Injector Wont Spray
Check wires at throttle body. can use a 12 volt test light to check for current. if you have spark it is not the ign module. set meter for 12-20volts. should have 2 fuse boxes on this model, one behind right side of dash at floorboard
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If there is no fuel pressure then its not getting fuel.If its not getting fuel, then getting spark is rare/.--------
So the problem relates to faulty fuel pump and clogged fuel filter.-------
It is possible that the fuel filter is clogged. If you're real careful you can inject a small amount of fuel in the air intake and see if the engine fires. (you can also spray starter fluid in the air-intake) If it does, you know you have a fuel issue; if it does not it could be an ignition issue. The air-intake is the best place to inject the fuel.----------Get the voltage checked at spark plugs and also check the coils.The spark plugs gets power to spark from coil pack.If the coils are faulty, the spark plugs will not spark.If coil is checked ok, then problem is spark plugs itself, causing the problem.---------It has to be replaced.This will help.Thanks.Helpmech.
Check the spark, remove the fuse to the fuel pump and remove one of the spark plugs. Connect the plug to its lead and position it well away from the engine against the truck frame (do not hold it) and turn the engine over, check the spark. If no spark it most probably a faulty coil. Check the impedance of the spark plug leads and replace any that are much higher than the rest.
My guess is that you have spark but no fuel, What?... OK this is what I think is wrong. Your pump is fine when at position 2 on the ignition switch however when you switch to position three to fire the engine the power to the fuel pump is momentarily disconnected. A leaking fuel pressure regulator or injector would drop the pressure in the fuel line and at the same time flood the engine making it impossible to start. Once you start the engine with ether the ignition is back to position 2 and the pump can make good any loss in pressure but because the intake mix is rich this will cause the engine to run rich too.
A good fuel system is capable of delivering 40 - 50PSI of fuel pressure and when switched off up to 90% of this pressure should be maintained for about 5 minutes, if it cannot check out the fuel pressure regulator and injectors. The fuel pipe should be capable of filling a pint pot in about 15 seconds, if it cannot check out the fuel filter is clogged.
Hope the above gives you some pointers
Hello. My suspicion on your problem is a plugged exhaust or slipped crankshaft to camshaft timing. I'd bet on the exhaust though. It appears your turbo is doing it's job as it is able to blow off the intake duct. But if all that pressure can't get out the other end it's bound to do that. Drill and tap a small fitting into the exhaust pipe behind the exhaust manifold and install a pressure gauge there. Should not be over 1 PSI at idle and not over 2 on throttle blips. Hope this solves your problem. If you need more help with this, ask me.
Spray aerosol carb cleaner into the throttle body while an assistant tries to start the engine. If it runs for a few seconds then quits, you are not getting fuel into the engine. Check the fuses. You might have blown the fuse for the fuel injectors (possible if you removed any of the injector harnesses) or the fuel pump relay. Charlie
I believe that you have throttle body injection (TBI) Take off the air cleaner and have someone crank the engine look at the injectors and see if fuel is seen..Do you or have you smelled fuel when you were recently attempting to start truck???? if so this sounds like you are not getting spark....if you havent smelled fuel try priming TBI with gas and see if the truck fires...If so you know that problem lies in fuel delivery... On TBI systems it is very important that a conicle spray pattern is delivered by injectors for proper ignition if injector drips fuel into TBI this could cause a no start condition...To see if spray pattern is correct you can use a timing light if available...Hook it up as normal (red positive post and black negative post and pick-up on #1 spark plug wire) point light at injector and have assistant crank engine light allows visibility to spray pattern.....also check the fuel pressure regulator and vacuum lines....Hope this helped you..let me know if I can help anyfurther....Good Luck!!!!