[DML] Exhaust system, engine rattle and port for emission testing
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[DML] Exhaust system, engine rattle and port for emission testing

Hi All

A few weeks ago after my 700 mile round trip journey to DCS, 2957 
developed an engine rattle, which was continuous and didn't change 
with revving, present at startup.  No less that 4 of us tried to find 
it, to no avail.  Talked to Rob Grady and inspected the "usual 
culprits", but no luck.  10 days ago, the rattle was suddenly 
replaced with a roar...uh oh, hole in the exhaust system?

Turns out that the rattle was probably a 13 mm bolt that is in a hole 
on the passenger side of the car, back of the engine compartment 
worked its way out and the bolt and/or the washer was rattling.  When 
it finally popped out, voila, exhaust roar.  We found it using the 
old "rubber hose" trick...that is, place a rubber hose many places 
around and about the engine and see if you get hot air in the face. 
We then put a broomstick on top of the hole, and the roar went away. 
So, a $2 replacement bolt got rid of the roar and no rattle anymore.  
Talked to Rob, he says "sure, can happen"  He mentioned that the hole 
was there for "emission testing". 

I had searched and searched on the DML for "engine rattle" and didn't 
find this mentioned. Since I didn't find anything on the DML about 
this, thought I'd pass it along. And...I couldn't find a diagram or 
mention of this in the shop manual, so as an FYI to others.

Rob, as usual, thanks much!

Joe B.


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