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Have 99 Park Ave. 3800 series II n/a. Original engine went with my daughter driving. She said it quit shifting and then revved way up and quit. When she opened the hood it was pretty hot and smoking. Towed it home couple days later changed oil and it reeked of gas. Drove around town and started knocking and gas in oil again. Pulled pan and a rod bearing and crank was scored. Picked up another 3800, had to use the old upper intake and put new upper and lower intake gaskets, new water pump, new MAP sensor because it seemed pretty loose, new plugs and wires, new oil pressure sender, nwe EGR gasket with original EGR. Hooked it all up would only run a few seconds. Swapped the fuel rail for the original one and it fired right up...But it seems like the exhaust gets hot quick. Thought it was just burning off PB Blaster and oil and stuff, but it didn't go away very fast. Only let it run 30 seconds or so at a time because we are paranoid of the last failure. Put a infrared thermometer on the exhaust manifold and it went up to about 320 F pretty quickly. Anybody with a good running one ever measure the ex manifold temp? Thanks for reading my book lol.
 

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The manifolds do heat up very quickly. If the engine is running too lean, the manifolds will glow cherry red. Better to scan it and see what O2 output is, fuel trims, etc. If Engine Temp is ok, then manifolds are usually ok.
 
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