Rattle noise near engine bay

Tiny
SURGEIMPULSE
  • MEMBER
  • 1994 FORD THUNDERBIRD
  • 2.8L
  • V6
  • 2WD
  • AUTOMATIC
  • 199,999 MILES
So when I rev the engine at high rpm's (about 3,000) I can ear a loud rattle that seems to be coming from the engine bay. I seemed to first think that it was the timing belt but the sound seems to be coming from another spot, which I think might be the heat shield. Engine mount bushings should be replaced. You can also hear it while coasting at around 80 mph. Oil pressure is good, coolant works fine. *Engine is a 3.8l*
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Tuesday, November 27th, 2018 AT 7:15 AM

21 Replies

Tiny
ASEMASTER6371
  • EXPERT
Good morning,

Yes, the catalytic converter shield is a very common issue.

The tac welds break and the shield vibrates. If that is the case, you need to have it re-secured.

Are you sure it sounds like the shield and not in the engine?

Can you upload a video of the sound?

Roy

REMOVAL

NOTE: The catalyst welded shields are to be replaced with clamp on service shields.

Removal procedures in most cases involve removing the shield attachments and shield.

INSTALLATION
Installation is the reverse procedure, using new parts.
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Tuesday, November 27th, 2018 AT 7:51 AM
Tiny
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  • MEMBER
I had to fix up an exhaust leak a while ago when I got the vehicle (the last owner was old and could no longer get a license due to health problems) and other minor issues like rust holes at the fenders. It is probably the catalytic converter or the heat shield. Will update later when possible.
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Tuesday, November 27th, 2018 AT 10:19 AM
Tiny
ASEMASTER6371
  • EXPERT
Sounds like a plan.

Roy
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Tuesday, November 27th, 2018 AT 10:20 AM
Tiny
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  • MEMBER
Here you go:
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Tuesday, November 27th, 2018 AT 1:30 PM
Tiny
ASEMASTER6371
  • EXPERT
Sorry. That is an internal engine noise. You need to have that checked as soon as possible.
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Tuesday, November 27th, 2018 AT 1:47 PM
Tiny
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  • MEMBER
Ugh! Guess I will probably need to replace a connecting rod bearings, if not swap the engine if it is too bad. I will get it checked out. Most likely should just swap it.
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Tuesday, November 27th, 2018 AT 2:12 PM
Tiny
ASEMASTER6371
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That is correct. Engine work is a lot more expensive than swapping it out.

Roy
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Tuesday, November 27th, 2018 AT 2:50 PM
Tiny
SURGEIMPULSE
  • MEMBER
So, the oil got bad after only five hundred miles since the last oil change, and I would like to have your opinion on an engine swap. If I was to put another V6 in, hopefully I should not need another transmission or ECU, hopefully I can find the same engine. Do you think swapping it myself will be able to get finished by the end of a day? I do not have a garage and would not want stuff laying around outside where I live. Or in your opinions should I take it to a quality mechanic. Overall putting in the same type of engine should cost how much, if you are okay with making an estimate.
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Thursday, November 29th, 2018 AT 7:10 AM
Tiny
ASEMASTER6371
  • EXPERT
Okay, if you got the same engine, it is not something that is easy. This is a huge job and will not be done for a couple of days.

You would need one day to remove the engine. Then time to change over the parts from your engine to the donor engine. Then install the other engine.

You will not need a transmission or the engine control module. That all stays with the car.

I would suggest finding a place to do the work but even a shop will take days to do the work. If you could rent a garage to do this, it would take the pressure off you for the procedure.

You would also need a huge amount of tools for this as well including air power which will require a air compressor and lines.

Roy
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Thursday, November 29th, 2018 AT 7:16 AM
Tiny
SURGEIMPULSE
  • MEMBER
Ugh, might need to just give the car up since I always have a tight schedule when it comes to work and stuff. This was my first car and really wish I could keep it, I just love it. Last time I took it to a mechanic they said the engine was in good shape, guess that was false as the rattle was a little noticeable at the time. I will park the car in my driveway and cover it up until I am able to get time off of work and a garage available. Thanks for the help.
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Thursday, November 29th, 2018 AT 8:59 AM
Tiny
ASEMASTER6371
  • EXPERT
Okay, sorry for the bad news.

Roy
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Thursday, November 29th, 2018 AT 9:01 AM
Tiny
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  • MEMBER
Hey, it is fine. I can get another car, the monthly payment for my T-bird is pretty low so I will not have any issue keeping it around.
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Thursday, November 29th, 2018 AT 9:03 AM
Tiny
ASEMASTER6371
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Good deal.

Roy
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Thursday, November 29th, 2018 AT 9:08 AM
Tiny
SURGEIMPULSE
  • MEMBER
It is not coming from the engine block or lower, the cylinder head is the source for sure. I will take a look at the rockers and valve springs.
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Thursday, November 29th, 2018 AT 4:42 PM
Tiny
ASEMASTER6371
  • EXPERT
Okay, let me know.
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Thursday, November 29th, 2018 AT 4:46 PM
Tiny
SURGEIMPULSE
  • MEMBER
The noise was coming from the valvetrain right under the fill oil cap. I got some seafoam spray and that quieted it down.
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Tuesday, December 4th, 2018 AT 7:10 AM
Tiny
ASEMASTER6371
  • EXPERT
Okay, but it will come back. That indicates to me you have an oil supply issue.

Roy
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Tuesday, December 4th, 2018 AT 7:19 AM
Tiny
SURGEIMPULSE
  • MEMBER
I decided to swap the engine due to low compression and general past mistreatment. Once I got the oil pan off to inspect I noticed that the rod bearings were very thin and on the verge to causing rod knock.
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Tuesday, January 22nd, 2019 AT 7:09 AM
Tiny
ASEMASTER6371
  • EXPERT
Good find.

Hopefully, the replacement engine is good.

Roy
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Tuesday, January 22nd, 2019 AT 7:12 AM
Tiny
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  • MEMBER
Seems to be working great. Throttle and IAC needs cleaning but other then that it is perfect.
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Tuesday, January 22nd, 2019 AT 7:15 AM

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