Older, pre-VVT applications will generate engine rattle. Later model VVT applications will generate engine codes and check engine lights prior to engine rattle If driving an older vehicle, or one with close to 100,000 miles, it is recommended to look for symptoms of the timing chain going bad or failing. Issues with the chain are common in higher mileage vehicles. The timing chain normally needs to be replaced between 80,000 and 120,000 miles unless there is a specific problem. How Do I Know If My Timing Chain Needs Replacing? The chain is located inside of the engine, every time you use the engine, the timing chain is in use. So my conclusion to my original question- cam tensioner issues will create noise, maybe some lack of smoothness, but not cause it to run horribly.A timing chain synchronizes the rotation of the crankshaft and camshaft(s) ensuring proper timing and allows the engine's valves to open and close during each cylinder's firing. One of the metal screens had the spot welds popped and there was a bit of it jammed in the solenoid freezing it in a semi open position. So I pulled the passenger valve cover and pulled the solenoid out. I swapped the cam sensors, but same result. Since I had very recently replaced the solenoids I suspected something else. It was one of the codes about cam timing on the driver side bank. I was able to get it to trip a code to clue me in. The chain noise was gone, but still had the weird running. So I got it back together and buttoned up. It is no wonder the seals on the tensioners give out when looking at the design, ford must have had an intern design that. So I replaced the chains, tensioners and guides. I don't know if it got hung up in approval, was my first post, but it didn't seem to actually get posted before. Thanks for the replies, I actually posted this back in June. It would be nice to have some prior torque pro readings. Thats why I do an engine flush every other time and before 5k. Ford counted on operating this engine with dirty engine oil hydraulically with small screens and passages but no monitor or special cleaning and tried to use extended oil changes.Not that other manuf hasn't done some of this ford just messed it up worse. If only ford would have used a real oil pressure sensor instead of an idiot gauge. The downside is they can cause more wear -but I don't go with that. The nice thing about old style tensioners is they ratchet and hold before oil pressure builds up each time. If oil leak bad enough it could cause both banks to act up with low oil pressure. It is possible the oil leak is stopping the phasor from operating properly and lube oil to that phasor and cam is reduced. Time on each side is determined by that cam linked to the crank so it has either jumped time or not. The job of the tensioner is to keep it from jumping time and whipping into the case, these are long chains and a little wear each joint adds up fast. So my main question is, is it consistent that the tensioner would cause this condition or should I be looking for other issues as well? I'd think the cam would settle out, maybe not? So it definitely has a bad tensioner, but would this cause such a bad idle and such low horsepower at higher RPMs? I guess I would expect the bad idle, but I'm worried about losing some much power at higher RPM. But I was surprised that when I count the links between timing marks when lined up, both chains match at the 30 links, so both cams are still in time. Just turning the motor by hand it leaks oil out and you can tell on the inside of the timing cover that it was squirting oil. I got it all apart and I found one side tensioner was completely shot, guides look good. In highway RPM's it ran smooth, just not much power, but maintained highway speeds and got us home.ĭid my research, expected to find a bad timing chain tensioner and a jumped chain. Overall felt like it had half the horse power it normally does. Lopey idle, chain rattle from around 1500 rpm to 2000 rpm. Pulling out of the driveway I noticed it was way down on power. A day an a half later we leave camp for home. Engine ran fine, no bad noises, full power.ĭrove about 4 hours to a camp site. I noticed a little bit of a chain rattle on start up for about 1-2 seconds for a few days prior to the issue.
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