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2003 Volvo S40 engine rattles

Tiny
STRETCHMAN
  • MEMBER
  • 2003 VOLVO S40
  • 2.0L
  • 4 CYL
  • TURBO
  • 2WD
  • AUTOMATIC
  • 125,000 MILES
There is a rattle coming from the engine between gear changes when revved in neutral and when coming of the gas, recently ran low on oil but is now full, not a knocking sound like big end failure, have had experience of that,
can you help?
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Monday, August 24th, 2015 AT 2:34 PM

12 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Is the sound a rattle or a tick? If a rattle, have you checked the heat shields on the exhaust? Have you checked the catalytic converter. I have seen them come loose internally.
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Monday, August 24th, 2015 AT 7:21 PM
Tiny
STRETCHMAN
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  • 7 POSTS
No loose heat sheilds and cat ok, definitely engine internal, top end I'd say
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Tuesday, August 25th, 2015 AT 2:41 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
If it is a tapping, chances are it is a lifter.
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Thursday, August 27th, 2015 AT 4:37 PM
Tiny
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  • 7 POSTS
Yes it's a tapping sound noticeable more when engine is at it's normal operating temperature and when free revved above 3000rpm.
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Thursday, August 27th, 2015 AT 11:52 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
You could try using an additive such as Lucas, BG, STP. It may help.
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Friday, August 28th, 2015 AT 8:25 PM
Tiny
STRETCHMAN
  • MEMBER
  • 7 POSTS
Ok will try that but I'm thinking it could be more serious an issue as last evening the car overheated quite badly, water temperature gauge was reading normal, fan was kicking in as normal and plenty oil and water in the engine, removed oil filler cap and all seems ok, no smoke or smell of burning oil but lost all power and had to crawl the last few miles at 15mph.
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Saturday, August 29th, 2015 AT 4:40 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Have you confirmed that the catalytic converter isn't plugged? Does it get red hot when the engine is running for some time? Also, since you lost all that power, did the check engine light come on?

PLEASE NOTE: Since this new issue with power loss, I agree with you that an additive most likely isn't going to do anything. Let me know the answers to the questions above.
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Saturday, August 29th, 2015 AT 7:16 PM
Tiny
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  • 7 POSTS
Have had the car on the ramp and checked the cat and all is good, when it overheated no warning lights came up at all. Have since driven the car and the overheating seems to have lessened (boiled over twice more when releasing the radiator cap but now just steam vapour).
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Sunday, August 30th, 2015 AT 12:36 AM
Tiny
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  • MECHANIC
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Are you sure the rad cap is good? If you only see vapor, are you sure it isn't low on coolant again? Also, are you using coolant or water to fill the system?
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Monday, August 31st, 2015 AT 8:44 AM
Tiny
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  • 7 POSTS
Rad cap is fine and I'm using coolant, hasn't overheated again since the boil overs, thinking it could have been an air lock in the system somewhere, rattle is still present though with no change, as you said it maybe a lifter, is there a way I can check this without major engine surgery?
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Monday, August 31st, 2015 AT 1:41 PM
Tiny
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  • MECHANIC
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The only thing I can suggest is to remove the valve cover and see if anything appears loose.
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Tuesday, September 1st, 2015 AT 11:07 AM
Tiny
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Ok will have a look.
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Tuesday, September 1st, 2015 AT 2:04 PM

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