Question about Cars & Trucks
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Posted on Jan 02, 2017
How's your coolant level? The intake manifolds on the 3.8L engines are prone to breakage at various locations causing coolant leaks into the crankcase and vacuum leaks on intake ports.Removal of the upper intake manifold will be necessary for inspection. Also, check for vacuum leaks at various locations on the outside of the intake manifold using WD-40 or brakeclean/carburetor cleaner sprayed hoses, non-electrical components, at the base of the manifold etc. As for a faulty injector, not likely but if you suspect one you can always swap the suspect injector with another on the engine and see if the misfire follows the injector. Just be sure to relieve the fuel pressure before servicing. Hope this helps.
Posted on Feb 10, 2009
SOURCE: only 2 injectors are firing
More than likely your injectors are burnt out. You need a digital multimeter to check it out. Unplug the connectors to the injector. Check the resistance it should be around 12 ohms. If the measurement is much higher it is burnt out out. Using a node light, If you don't have a node light you can use a LED with a 1k resistor connected to the anode. Connect that to the injectors wire terminals to see if the computer is providing pulse to it. Caution don't put DC current on injectors by using the battery, you will damaged them. Don't use a regular light bulb to see if the computer is providing pulse, it can damage the computer. The LED light must have a 1k resistor in series with it. This makes it safe to connect to injector terminal.
Posted on Jun 28, 2009
Remove the plug and check the compression for that cylinder it should be between 120 psi and 150 psi, if it is low it is a mechanical issue (bad valve or worn piston rings). If commpression is low remove the valve cover and turn over the motor confirming that both valves for that cylinder are opening to there correct travel or height if not it is a faulty hydraulic lifter or worn cam. Also check the valve lash clearance the clearance is usually .012" for the exhaust valve and .008" for the intake valve to check the lash turn the motor over until the valve shuts completely for each valve, then use a feeler gauge go no go procedure. Has the wire been replaced for the plug? If this motor has coil on plug type disregard plug wire question.
Posted on Jan 05, 2010
Testimonial: "Thanks, was fearing that."
The very first thing that you should do after finding a cylinder mis-fire that can not be easily explained such as a fouled spark plug, is to take a compression test especially of the mis-firing cylinder to be certain that the mis-fire is not caused by a mechanical problem, and I have seen people spend a lot of time and money trying to hunt down an electrical problem when the actual problem was a mechanical one, and no electronic part will repair a burnt or bent intake or exhaust valve.
Posted on Jun 06, 2010
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