450 CDI Tickling sound when accelerating

[FranRukario 2]

Hello everyone,

I have a 2002 CDI Cabrio Smart with 199000 Km, but recently I'm hearing some strange noise from my car.

When I Accelerate I hear some Tickling sound from behind, this noise won't be notice if I release acceleration pedal or when the car is changing gear.

What should I inspect? My mechanic said that it's nothing, but he haven't control what it could be.

I changed the last month my exhaust, but it was doing it even before.

Thanks

[tolsen 630]

Rear panel heat shield touching either exhaust or something else.

[tolsen 630]

Something you also ought to check is engine oil pressure and hydraulic valve tappets.  There should be a noticable clatter from engine when idling if tappets are bad.

Check oil pressure using a pressure gauge.

[FranRukario 2]

On 13/11/2019 at 1:44 PM, tolsen said:

Something you also ought to check is engine oil pressure and hydraulic valve tappets.  There should be a noticable clatter from engine when idling if tappets are bad.

Check oil pressure using a pressure gauge.

Is there anywhere a guide on how to install a pressure gauge?

Thanks

[FranRukario 2]

On 13/11/2019 at 11:49 AM, tolsen said:

Rear panel heat shield touching either exhaust or something else.

I'm thinking it has to do with the exhaust, because I can hear it from the right side.

What could I look for specifically?

[LooseLugNuts 557]

On 11/14/2019 at 11:00 AM, FranRukario said:

Is there anywhere a guide on how to install a pressure gauge?

Thanks

 

remove sender on rear of engine and screw in gauge hose

[xenontibi 0]

possible reasons:
hydraulic valve lifter (wear)
rpm (top dead center) sensor (signal delay) (later signal) : this is my last successful fix