[V8] Intermittent no-start and rotten egg smell

[Dave Saad]

I am not sure about a failing cat, but a very rich mixture will make  
that rotten egg smell - it means the cat is trying but failing to burn  
up whatever it is supposed to burn up.
Left unchecked, you will have dead cats.
I think I would look for an overly rich mixture problem before I  
condemned your very expensive and hard (or impossible?) to get cats.
The obvious culprits are probably fuel pressure regulator, MAF, O2  
sensor, in that order.

Dave

On Jul 19, 2009, at 12:52 PM, Seamus O'Carey wrote:

> I believe the rotten egg smell is a typical sign of a failing  
> catalytic
> converter.
>
>
> On Fri, Jul 17, 2009 at 8:07 PM, Radek <radek at istar.ca> wrote:
>
>> After installing a new air filter and cleaning the spark plugs, I  
>> tried to
>> start the newly acquired 93.  It wouldn't.  The fuel pump relay  
>> would click
>> once, engine would not turn over.  There seemed to be no current  
>> draw (I
>> tried starting it with an interior lamp on, it wouldn't fade).  PO  
>> had an
>> aftermarket radio installed and left some cables connected to the  
>> vacum pump
>> next to the battery, which I removed.  I reconnected those and  
>> tried again -
>> the car started.
>>
>> It ran at high idle, about 2000 rpm, dropped to 1000 rpm when in  
>> Drive.  I
>> will check the TPS tomorrow.  At some point it gave a nasty smell  
>> of rotten
>> eggs - where's that coming from?
>>
>> I let it run until it warmed up and switched it off.  Came back ten  
>> minutes
>> later, without disconnecting anything - it wouldn't start.  Same  
>> symptoms:
>> when the key is turned, fuel pump relay clicks, no voltage drops,  
>> engine
>> doesn't turn over.  Giving it a boost with a 60A charger doesn't  
>> help.
>> Where should I look?
>>
>> Radek
>> 91 V8Q 5-sp
>> 93 V8Q
>>
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