Hello,
2005 Grand Voyager 3.3l gas. If my timing chain has jumped a cog would it definitely throw a code?
I have removed a cylinder head in preparation to replace the valve lifters due to a bent intake valve. However I see evidence of all intake valves impacting the top of the pistons on that side. Only one of the valves was bent so again I am suspecting either timing chain, low oil pressure or all hydraulic valve lifters faulty???
Yet I am not getting a code
Any advice please.

 

For a cog jump there will be a cam sensor code..Get all the valve lifters cleaned out or renewed. Time it all up of course on rebuild.

 

There is an issue with one of the V6's think its the 3.5/3.6, where the valve stem to guide clearances cause the valve to stick and hit the pistons. Check the valves are free in the guides full travel, incase they are slightly bend after an earlier collision. As too the timing chain check for wear and cogs/sprockets for hooked teeth. As far as I can work out with this engine, which is reported many times to be noisy, it's due to poor maintenance and lack of servicing, as it all comes down to the lubricating oil. Jacked up lifters due to sludge maybe the cause of valves hitting pistons...
Oh and just incase, I read of one guy rebuilding his V6 engine after bent valves and after rebuild he found the valves were still hitting the pistons. So whether he had a sheared woodruff key, (are they fitted) causing the timing to be dramatically out, but he did say he timed it right. So check how the cogs are secured to crankshaft and camshaft.

 

Thanks for your help Goggs.
I should have clarified that I do not believe the timing chain has jumped a cog. It was more a question of IF it had jumped would it throw an error code? As I have no codes coming up I am going to presume the chain is OK.
It's definitely the 3.3l engine I have in my car.
I have now pulled the other head and save seen where the #5 piston has impacted heavily with the valve. That valve is bent badly. However Cylinder 1 & 3 have no sign of impact so I am leaning towards blocked valve lifters as being the problem.
Anyone think of any other possibilities?