Hi, i have a ticking noise in my 2004 XC70 that I hear when the car is first turned on (engine is cold). Once the car warms up, the noise disappears. My mechanic finally thinks he diagnosed the problem and said its the exhaust gaskets that are contracting when the car sits for a while, thus creating the ticking noise when the engine is started. The noise disappears when the engine is warm b/c the gaskests have expanded and there is no longer space in between the exhaust manifold and the cylinder head. he game me a quote of $865 to fix this saying the bulk of the work is labor b/c its a particularly difficult part of the engine to reach so he has to use mirrors and such to get in there. Anyone heard of this?
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Re: Exhaust manifold gaskets
The ticking noise when cold is an exhaust leak.If it is the exhaust manifold gaskets,depending on the vehicle they can be very difficult to replace.in some cases you must remove many other parts even to see the manifolds.make sure when manifolds are off that they are checked for warpage,this is a simple test needing only a straight edge and feeler gague.ask your tech if he can see any broken manifold studs/bolts and if quote covers time for removing broken manifold studs/bolts,because if any are broken,this can take quite some time to extract the broken studs/bolts.
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When you start the car with cold engine the oil light indicator is on even after the engine started?
If the sound comes from the engine itself you could check the oil level with cold engine before start.
If oil level is ok ( between low and maximum marks on the dipstick ) then could be 3 posible causes:
1. Bad oil
2. Faulty oil pump
3. Worn camshaft bearing, worn crankshaft bearing, or faulty piston bolt.
It may help if you bring on some more details like since when is making that noise, in what circumstances appeared and so on.
Exhaust leaks,like a manifold or loose plug will sound like a tick inside the car,if it is louder when it is cold,suspect something more serious ,like a piston. if the tick only happens when u turn,it's an axle joint.
You have a leak in the exhaust system. Have it looked at soon. You don't want to be breathing carbon monoxide while driving. If you hear a "ticking" sound while the engine is running (more predominant with a cold engine) it's most likely an exhaust manifold leak, either a bad gasket, broken stud or cracked manifold. Other possible causes could be the "donut" gaskets that seal the Y pipe to the exhaust manifolds, the Y pipe to catalytic converter gasket (if equipped).
Theres a leak somewhere, make sure theres no cracks in the manifold or a worn gasket at the connection pipe, heres apuicture of your exhaust to show you where to check, also the manifolds should of been checked when the gaskets where replaced, these vans are known for breaking exhaust manifold bolts, hopefully they didnt try to replace the gaskets with a broken bolt,hope this helps.
I had what sounds like the exact same problem. It was an exhaust leak from the left (driver's) side exhaust manifold. This engine has a history of the manifold bolts breaking and causing the exhaust leak. The engine is also used on some Dodge vehicles. It sounds like a tick and I almost mistook it for a bad lifter. I took it to the local Jeep dealer who confirmed the exhaust leak. I replaced the left manifold completely and replaced bolts/gaskets on both sides (left/right) and it fixed the problem. Be careful, as the dealer tried to gouge me on the price. You are looking in the ball park of $600 parts/labor. I got parts for $120 and it took the better part of a work day to do the job.
A small exhaust leak can sound like a ticking noise during acceleration and can get better or worse as the system heats up. I had a similar problem when the engine was cold that was solved with a new exhaust manifold gasket.