[V8] ISV

[Dave Saad]

The ISV valve is at the front of the intake manifold, right over the throttle plates.  It has a 2 wire connector on it.  There is a wiggle test you can do to test it, and I suggest you do because you may get some other codes that could tell you more.  You will need to make the test light setup from here:
http://www.sjmautotechnik.com/trouble_shooting/ecufv8.html

My problem is getting weird.  Of course.  What else could I expect?
I have eliminated the MAF, O2 sensor and vacuum leaks.  Mine runs great until it does its thing - then it turns on the MIL light and then SOMETIMES it does the thing where it feels like there is no fuel getting to the motor - then it comes on strong.  Today when it did it, I switched on the AC just to see if it would kill the motor (at idle) and it almost did, but then it started to run fine and the MIL went out.  I am starting to wonder if the fuel pump is starting to go? It does not make any unusual noise.
I have noticed that the motor seems hot - the temp gauge is fine but it just seems hot so I pulled two plugs today and they are white.  That says running lean to me.  I am going to check fuel pressure next but I bet it will be fine.



On May 23, 2012, at 1:57 PM, <bw at UDel.Edu> <bw at UDel.Edu> wrote:

> I have a similar problem with my "92.  The idle will not hold and begins to 
> decline/hunt to 500rpm from 700+. This happens if I have down shifted (the auto) 
> or accelerated (in S). I get a muffled backfire or a hesitation hiccup first. 
> It is like "vapor lock", because it is always a hot engine on a hot day. It has 
> symptoms of rich running, smell of gasoline when machine is at idle and uneven 
> running (will often slow from regular idle rpm's and stop).
> A new hall sensor and TPS helped, but something else??? Where is the idle switch 
> and idle stability valve? I am sure this is a common problem. Thanks,  Bob
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