Question about 1997 Buick LeSabre
I have an intermittent misfire on cyl # 4.
Not the coil, plug, wire. Tested for pulse on injector #4.
80% of the time, restrting engine will make it go away?
Then, when hitting brake or acceration will start again. Always a PO304 code.
Suspecting a intermittent failure or sticking of injector if that is possible??
Possibly a weak valve spring on cyl 4?
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
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Posted on Jan 02, 2017
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