2.7l has low power after rebuild.

I've done a timing chain twice. The first time there were markings (this was an aftermarket set) but were contradictory based on the exhaust side of the chain not being tensioned. I was off a tooth but couldn't figure out why. I thought the adjustment cam was needed until I ignored the marks.

The link count was correct but my assumption was that the chain was made incorrectly and perhaps mixed marks, e.g. two bright links split by a dot rather than a single bright link with a single dot like the manual shows.

The second time I bought factory parts. The bright links and dots made sense so the only trick was taking tension off to get the cam gear to fit on.

Point is I'm a knucklehead and takes me twice as long to do everything.

 

Pulled the timing cover off and alignment marks are bang on. You can see the marks are all two links over from the colored markers.

Feeing pretty defeated/frustrated right now. Any ideas what else I can look for?

Thinking it may have been in a limp mode. Although no codes and no idea what could have caused that.

 

So you are two teeth off on the marks on the cams from the chain links, how far off on the crank mark and link?

 

He's also two off the crank

 

Ya, the colored markers are two links off at this point so timing is good.

Those marks are there for the initial alignment. As soon as you turn the crank once they will lose their place and start to move. If I moved the chain two links to the left without moving anything else, everything would still be in its place.

X links between the cam marks and Y links between the cam and crank marks.

 

Shouldn't they potentially realign whenever the engine is at TDC on #1 with enough turning? The relationship is key and since it appears both are moved two teeth I think your conclusion is right, though.

 

Ya exactly. I turned it enough times that it got close for the purpose of the photo.

 

All this gets me a little confused. But as the crank gear is turning twice as fast as the cam gear, wouldn't that mean if the cam gears were 2 links off, the crank gear should need to be only be 1 link off to be correct. Why not put the marks where they should be?

 

Every 2nd turn of the crankshaft, the timing marks should be right back exactly on the marks.

 

Definitely not just two rotations. Just turned it over by hand for 5mins to line up the mark. Wrist feels like it’s going to fall off.

Hard to see but they’re aligned.

 

If you are sure your timing is correct then I'd start with making sure your catalytic converter isn't plugged up.

 

Seems odd that would be the issue if the truck was running fine before the rebuild. Unless they were replaced with used..?

 

Ya, truck ran fine other than burning 6l of oil between changes.

Going to check the cat either way (which I replaced about 6 months before the rebuild). Check coil resistance, grounds, maybe check fuel pressure somehow. Might burn and collect insurance money.

 

Any chance there’s something wrong with the VVT?

 

Sorry, I'm thinking crankshaft position vs cam position, every 2 turns of the crankshaft, the cam & cam marks will be exactly where they were. the chain links will be totally different. For some reason, still thinking 2 links on the cam may be 1 link???? Uh,... I think I'll just sit back & listen

 

Calling @Loxsl

 

Also @FishTaco401 and @Taco Nation

Please and thanks.

 

Old school timing method.
Remove valve cover and bring #1 to TDC non compression stroke verifying with dial indicator (or screwdriver through spark plug hole.
Look at valves. As your coming to tdc, exhaust valve closing.
After tdc intake opening.
The rock between the valves,(ex-closing and In-opening) should coincide with the tdc mark on crankshaft.

 

Shenanigans