Slight clacking noise when getting on it..

Noticed a clacking noise when the trucks cold in the morning when i get on it, only seems to happen when its cold. I noticed it warm few days ago, not very loud and cant mimick it when im in N or P. 2.7 auto 138K.

Thanks..

 

Anyone? Im pretty sure it only does it when the engines cold. Cant really pinpoint where it comes from.

 

My 2006 2.7L has 86K miles and does the same thing. On cold start, if it's under 35*F, it has a light knock after the engine spools down. If I give it some gas, the knock gets a little louder so I just be careful to give it very light throttle until the knock goes away. The knock goes away very quickly, about 2 minutes after initial cold start. It's a little irritating but it only happens on the coldest mornings (CA) and it goes away quickly, plus I haven't had any problems with driveability or fuel economy or oil consumption. Runs fine.

I did a couple searches on "engine knock" and "cold knock." These links may or may not be helpful to you:

http://www.tacomaworld.com/forum/1st-gen-tacomas/258941-knock-bottom-end-2-7-a.html

http://www.tacomaworld.com/forum/4-cylinder/244968-2-7l-cold-start-rattle.html

http://www.tacomaworld.com/forum/2nd-gen-tacomas/248970-engine-knocking-cold-start.html

 

Only does it in D (flipped it into N today while driving) starts to become noticable after about 1500rpm. Also, is it normal to idle at 1500ish RPM (25*)?

Thanks

 

My 09" has a knock when its under 25°F out.

 

This one only does it in D sounds great when in N

Anyone?..

 

I almost believe its something transmission related...sounds great in N (when revved) havent tried going real fast in R when cold or the lower gears..

 

i have a 1996 2.7 5 speed had loud clicking noise on top of engine., so we put new lifters in and went ahead an put timing kit on.. that didnt help. engine has 174000 miles. with brk on and in gear if you load engine sound will stop at certain rpms. any ideals what that might be?????

 

My '04 2.7 makes a noise that might be similar... haven't figured it out yet. I'm hoping it's not a timing chain issue. My 2.7 has mechanical lifters, so it's not the lifters failing to pump up properly. Only does it cold, and only for a little while. I use Mobil 1 5w-30. It's not a very happy-sounding sound.

 

Im dont think mines engine related..just transmission related when the fluid is cold..think im going to get new fluid and filter and go from there.

 

Since it only does it in D I changed the trans fluid (drained/refilled) Still doing it I have no earthly idea.

I dont think it could be timing (pinging) because if I rev it in N it sounds good.

 

Bump, Like said above, it ONLY does it in DRIVE when freshly started...

Im stumped.

 

TTT

Maybe it could be an exhaust manifold cracked? Seems popular on this year truck. Heat shield rattles so I may take it off and have a look.

Dont understand why it could leak ONLY in gear and not in N or P (Noise only happens when its cold or been sitting more than 1 hour @ 45* temps)

Ideas?..

 

Confirmed cracked manifold Trying to decide which route I want to take. I *THINK* this is recently happened but IDK for sure. You guys think the valves are OK?

Thanks I'll update again when the noise is gone to confirm a fix for others like me desperately searching the net lol

 

confirmed it was an exhaust leak all fixed