Question about Cars & Trucks
Truck was running fine then all the sudden it started knocking and every now and then it would bang. it started to misfire, i replaced all plugs and plug wires, replaced 4 tower coil, and put new injectors in it. it has 120 lbs of compression on both cylinders and has 33 lbs of fuel pressure while engine is running. the injectors pulse and the plugs fire outside the motor, but if you pull plug wire off of cylinder 3 or 5 nothing happens. i also sprayed carb cleaner around intake and all hoses with no effect. anyone know a solution i have not tried?
Posted by Anonymous on
I would bet my bottom dollar you have an intake manifold gasket is leaking. My 5.4 ford manifold had to be replaced due to being cracked because they are plastic, common problem..
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Posted on Jan 02, 2017
Most likely I a would suspect the fuel rail had moisture in it. If you checked emissions it would most likely show no HC and alot of 02 and no CO. If it does show alot of HC then I would suspect sticking valves intermittantly . The pinging really points to no fuel issue tho. If you pull the injector connector off and no change then I would remove the fuel rail and inspect. Also make sure the wires are in the correct locations. It easy to get them wrong.
Posted on Sep 03, 2009
It sounds like the number 2 injector is hung open.
It will dump fuel and cause all sorts off issues with the ECU.
You should ohm that injector and compare it with the others to see if it is wildly different. If so, change it out and retest.
Posted on Jun 27, 2010
SOURCE: my truck has a #4
Try to check that the fuel injector, using a fuel injector tester, is getting an electrical pulse as indicated by the tester lighting up and blinking periodically.
Also, one can check the injector by putting a stethoscope on the injector and listening for a loud click.
Also, check that antifreeze is not leaking into the cylinder causing the plugs not to fire. How did the plug look that was replaced? It should have had a light brown dry appearance if normal.
Posted on Oct 07, 2010
Testimonial: "answer was very timely, and definately gave a good NEW direction to look. Thanks."
Hello, It seems you have done a lot in trying to fix this. My first idea is that it is a pickup sensor for the camshaft or crankshaft. The firing order of your engine is 1 4 2 5 3 6. You are having misfires in 3 consecutive cylinders 4,2,5. This would seem to mean that the distance to trigger the firing is greater on 4,2,and 5 than on the other 3 cylinders. This can mean you have a lopsided situation on either the crank pulley or cam. You should see if the crank pulley is tight as well as the cam or if you can better adjust the 2 sensors.
Next, the Intake system can have a bad gasket. Use a water spray bottle and with the engine running, put a mist on the Intake gasket. If you have a change in RPM, then you have found a leak. This would explain why the same 3 cylinders are always misfiring. Some of the V-6 models used sandwiched 2 piece manifolds and the gasket between the upper and lower half would deteriorate over time. Some engines used "runners" between the Intake manifold and heads which could gum up over time. Just a cleaning operation if you are putting on a new Intake gasket anyway.
I hope my solution is very helpful and would like to know what you finally found as the problem.
Posted on Aug 03, 2011
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