Re: [DML] Re: Slightly rough hot idle, sulfur smell
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Re: [DML] Re: Slightly rough hot idle, sulfur smell



Thanks Harold,

I spoke with Dave Swingle and this is my plan of attack - 

1. Pull injectors and cold start valve and make sure they are opening evenly and spraying correctly.  If not, get injectors cleaned.  If so, step 2.
2. Replace O2 sensor and check frequency valve activity with my dwell meter.  If it's off, I'l adjust the CO
3. If it's swinging correctly, I'll have to use my fuel pressure gauge to check pressures, but I'm pretty sure those should be good.

I'll let you all know what I find!  Probably be doing this over the weekend.

Andy






-----Original Message-----
From: Harold <hmcelraft@xxxxxxx>
To: dmcnews <dmcnews@xxxxxxxxxxxxxxx>
Sent: Wed, May 18, 2011 12:28 pm
Subject: [DML] Re: Slightly rough hot idle, sulfur smell


You might also check that the cold-start valve is closing properly and the 
accum lines to the fuel pressure regulator are connected properly.
Harold McElraft - 3354

-- In dmcnews@xxxxxxxxxxxxxxx, Soma576@... wrote:

 
 Hey all,
 
 The last couple of years my D has had a slightly rough hot idle.  It's at 
round 900 rpm most of the time when hot, and it kind of wavers down to about 
00, then surges to 1000, then back to 900 or so.... A couple years ago it was 
ery smooth so I know what it can sound like.  The car starts easy cold, after a 
ouple of cranks hot, and has plenty of power.  It's not missing.
 
 I added a bottle of Techron to a pretty low fuel tank to shock clean the 
njectors in case they got dirty.  I know everything in the tank is good, and I 
ave checked all the obvious stuff like vacuum lines.  
 
 Anyway I can smell the exhaust at hot idle and it smells like extinguished 
atches - a little like sulfur.
 
 Does that sound like a rich or lean condition?  
 
 Andy
 
 
 
 
 
 
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