RE: [DML] Idle gradually increased to 1700 RPM during warm up

[<rob@xxxxxxxxxxx>]

Hi Allen,

 

A plugged converter will be the result of the problem as opposed to the
cause. A plugged cat always has a cause and it's usually excess fuel or
ignition misfiring or both as either problem tends to cause the other. The
task at hand is to figure out which started first. It's kind of like "the
chicken or the egg theory"!

 

Rob Grady,

 

P.J.Grady Inc.

 

 

  _____  

From: dmcnews@xxxxxxxxxxxxxxx [mailto:dmcnews@xxxxxxxxxxxxxxx] On Behalf Of
Allen Mayorga
Sent: Monday, May 18, 2009 3:16 AM
To: dmcnews@xxxxxxxxxxxxxxx
Subject: Re: [DML] Idle gradually increased to 1700 RPM during warm up

 






Check your CAT a plugged Cat will cause this problem.

 

________________________________
From: dmc_5180 <dmc_5180@yahoo. <mailto:dmc_5180%40yahoo.com> com>
To: dmcnews@yahoogroups <mailto:dmcnews%40yahoogroups.com> .com
Sent: Sunday, May 17, 2009 6:51:54 PM
Subject: [DML] Idle gradually increased to 1700 RPM during warm up

This is a never before seen problem on my car during my 16 years of
ownership. I went to start the car this afternoon , it had not not been
driven since the DMCMW open house weekend 3 weeks ago. The car fired right
up as usual Idle was stable at 775 +/- 25 with a very subtle hunt but
virtually stable. I walk away from the car after 20-30 seconds I'm letting
it warm up. I was getting a few things from the trunk of my other car to put
in the D. While I had my head in the trunk of the other car The RPM starts
to gradually increase on the D. I did not think too much about it Figuring
that the Idle Micro switch might not be tripped. I walk back over the D get
in driver seat to see the IDLE is at a steady 1700 RPM . I tap the Pedal a
few times NO change. OK, I Go back to engine bay to make sure the Micro
switch is depressed. It IS. Then I happen to Look down at the Left EXHAUST
HEADER. This Is a JET-HOT coated system. The header starts GLOWING and IS
increasing rapidly. I do a quick check of the Right Header which appears to
NOT be turning colors at this point. FYI I was in a rather dark building at
the time so it was fairly easy to see the heat GLOW. Well I've never had
this happen before. and As the header starts turning very RED rather quickly
, I Shut it down immediately. While the engine was shutting, down I hear a
woooof sound in the exhaust, almost like I flame igniting. The exhaust
header quickly turns back to normal color. I wait about a minute then start
the engine again. Idle is steady at 1700. The scary part for me was the Left
exhaust appearing to be much hotter than the right. Again I did not notice
the Right side turning color as the left did. This is a STAGE I exhaust.
both sides are independent each with a CAT. I thought about the possibility
of maybe a plugged CAT but I'm not so sure about that. Any thoughts of what
may have caused my idle to increase like that?

Dennis

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