Thinking the worst...here's what happened

[frotosride]

So I loaded the bikes (M109R & GSXR750) in the bed of the truck. For about 20 miles everything seemed fine. I was babying old blue because of the bikes. I never got over 40mph. I actually eased onto the interstate and as I approached 35 I heard what initially seemed like a loud metallic boom. My first thought was transmission, great! After the noise I couldn't get over 35. When I pressed the gas the engine would bog as if someone hooked a D5 dozer to the truck. I pulled over looked at the tranny and t-case expecting pieces to be hanging out. Pulled over again found I was a little low on tranny fluid so I filled it up and got on the road.bout a mile and it happened again. The amount of traffic was too loud but the next time it happened I knew what it was. The loudest backfire I have ever heard. I got to thinking what was the last thing engine related I touched.. Knock sensor! Ohand re-did the radiator mount. When under load I can hear valve train chatter. I use Lucas ZDDP additive and have every since  the rediclouse spa took it away from us. I doubt I wiped a lobe but it's always possible. But so is a bent push rod. I left the truck on base and I'm headed to Maine with the family. Any suggestions for me to check when I get back. When I can I will try and post more when I get more time to troubleshoot. Thanks for the help.

[bd]

A bent pushrod would probably be associated with a regular misfire, even if subtle.  Check engine vacuum with a gauge to rule out valve train, then check for a restricted exhaust.

[frotosride]

I will Check the vaccum for sure.not sure what could be restricting my exhaust because its just headers and a pipe but I will make sure something odd hasn't happened.

[frotosride]

So I got a chance to drive the truck an look at little under the hood. I do have a few loose to rockers but they do not seem to be lose enough to be causing my problem. I'm headed back to main so it will be after. Christmas before I will be able to check anything else. I'm still thinking its a timing issue of sorts. The truck has 168k on the original engine and nothing started until I had a heavy load in the bed.

[frotosride]

I unfortunately didn't get to check the oil for flakes..wish I had done that for sure but one thing I did notice is since the incident the truck had been keeping extremely smoother which barrels me. However as soon as I put it in gear I can hear the valvetrain chattering like mad. Anymore suggestioms welcomed..

[rich weyand]

Sounds like you jumped the timing chain.  BTDT.

[roundhouse]

Sometimes
You can spot a jumped time by holding a dollar bill over the exhaust pipe
dissconnect the coil
And have someone crank it over

If it tries to suck the dollar bill into the exhaust pipe
You have a jumped timeout chain
Also it will spin over really easy and fast when you try to crank it


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[80midnightchevy]

Just a suggestion, is there any possibility that a piston has gone bad. As for the rattling once it's under load or put into gear, could that possibly be the front end of the tranny. Possibly one of the bolts on the bell housing was shaken loose or the torque converter bumped wrong.

[frotosride]

Sounds like you jumped the timing chain.  BTDT.

I think this may be the issue for sure because of the way the engine is acting. not so sure about actually skiping a few teeth but I do think that there may be a chance tha The chain has slack in it and the extra load brought it to its breaking point.
 

Sounds like you jumped the timing chain.  BTDT.

I never thought about this but its going t be a little harde to notice with a 'y' pipe and dual out. But I may be able to try it. Either way as son as I get back I am putting the engine back tgether and limping it back to the on base hobby shop and popping the timing cover, replacing the chain and gears since they are so cheap. I do not paln on putting too much money into it because The 6.0 will be in the near futue. I just need the truck to haul the bikes to Maine.

I seriousely doubt this because this truck has been takin extremely good care of and there isn't anything that would suggest a piston faliure.
Just a suggestion, is there any possibility that a piston has gone bad. As for the rattling once it's under load or put into gear, could that possibly be the front end of the tranny. Possibly one of the bolts on the bell housing was shaken loose or the torque converter bumped wrong.

[80midnightchevy]

Which base do you live on?

[frotosride]

I'm not currently living on base but it's where the truck is and the hobby shop is the easiest place with lifts and all kinds of tools. Either way it's Naval station Norfolk.

[frotosride]

. Heres a video of blue running. No codes or my light doesn't work. And help?
I did unplug the smog pump electrically and plugged the vaccum line. Other than the other things I previously mentioned I have unplugged the IAC and no change at all. I unplugged the coolant temp sensor and idle went up slightly but all symptoms were still there.

[Captkaos]

It sounds like an exhaust leak

[VileZambonie]

you probably blew out a spark plug insulator

[frotosride]

Cap.. After posting it I'm positive its an exhaust leak
Vile..I'm gonna check them in just a few. If I don't get him running in 3 days I smell intake and carb!!