HT4100 4.1, 4.5, 4.9 Discussion, A 4.X Water Pump Story - Not for the Faint of Heart in Cadillac Engine Technical Discussion; Just finished the water pump on my '87 HT 4100. It was a bit more challenge than I envisioned. You ...
Re: A 4.X Water Pump Story - Not for the Faint of Heart
There's always that one bolt, isn't there? Glad your car is working again.
I say this while knocking on wood, but I'd be very surprised if there's much left to fail on your car, given that you've already replaced the alternator, water pump, A/C compressor, and EGR system components. Despite the occasional issue (I've replaced my alternator and EGR valve thus far), my 4.1L Cadillac has been uber-reliable. I also finally traced my hesitation problem to a plugged breather and sticky valves which I've half cured by spraying carb. cleaner on the valves while the engine is running. I still need to remove the back valve cover and perform this treatment. You may want to try something similar next time you have the valve covers off. I think a varnish built up on the valves/guides when the intake gaskets blew which was causing a few valves to stick open at higher RPMs.