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Idle control Valve?



 
 
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  #11  
Old March 28th 10, 02:21 AM posted to rec.autos.makers.saturn
Oppie[_7_]
external usenet poster
 
Posts: 175
Default Idle control Valve?

"danielr" > wrote in message
...
>
> Hi Oppie;
>
> Thank you very much for your insight.
> I am in the process of getting "that second" opinion, and get the leak
> fixed.
> I am trying to to avoid (as much as possible), going to the dealer
> shop.
> Here in Canada, they are extremely expensive.


I've been considering again getting the Autotap tool. Had considered getting
this a few years back but didn't have a laptop at the time.
Just got an email from autotap telling of their new product. Looks to be
the same hardware but an entirely new software package. www.autotap.com
For $200 and if you have a laptop, there is some impressive diagnostic
ability. Not just a code reader but can read and display all the engine and
BCM data. ABS and transmission codes are not supported (which is not a deal
breaker but I'm not happy). Other thing is that aside from resetting the
Check Engine Light, it's a read only device; you can't change any program
values or exercise solenoids. Still, the data you can read a wealth of data.

Good Luck,
Oppie
White Plains, NY USA

Ads
  #12  
Old April 4th 10, 04:44 PM posted to rec.autos.makers.saturn
danielr
external usenet poster
 
Posts: 19
Default Idle control Valve?

On Mar 27, 9:21*pm, "Oppie" > wrote:
> "danielr" > wrote in message
>
> ...
>
>
>
> > Hi Oppie;

>
> > Thank you very much for your insight.
> > I am in the process of getting "that second" opinion, and get the leak
> > fixed.
> > I am trying to to avoid (as much as possible), going to the dealer
> > shop.
> > Here in Canada, they are extremely expensive.

>
> I've been considering again getting the Autotap tool. Had considered getting
> this a few years back but didn't have a laptop at the time.
> *Just got an email from autotap telling of their new product. Looks to be
> the same hardware but an entirely new software package. *www.autotap.com
> For $200 and if you have a laptop, there is some impressive diagnostic
> ability. Not just a code reader but can read and display all the engine and
> BCM data. ABS and transmission codes are not supported (which is not a deal
> breaker but I'm not happy). Other thing is that aside from resetting the
> Check Engine Light, it's a read only device; you can't change any program
> values or exercise solenoids. Still, the data you can read a wealth of data.
>
> Good Luck,
> Oppie
> White Plains, NY *USA


Last Monday I took the car to this "second opinion mechanic".
He fixed the leak; extracted the black bakelite elbow, and readjusted
its fit. He noticed that EGR valve looked relatively new (it was
actually changed October last year, after repeatedly SES notices and
P0404 DTCs), mentioned that probably, when they changed the EGR
somehow might have banged into that coupling. There is an O ring
inside which perhaps was not fitting well.
When trying to start up, IT DIDN’T.
He put his (professional) ODB scanner, which reported DTC 1599.
Checked spark into plugs, and here wasn’t. He indicated that it could
be crankshaft position sensor [CPS], or the ignition module or the
computer.
By then, I left to have him working without me scooping around over
his shoulder (I believe it is very annoying for some people, and
didn’t want to take the risk).
Something he mentioned: He said Saturn was an invention from GM to
confront Japanese penetrating USA markets. Then, they put together
(IIRC) a Suzuki engine with some other GM not too vital parts (I don't
remember the tranny make he mentioned), and the plastic body. I am
mentioning this because he expressed his confidence with confronting
the problem based in his familiarity with GM “automotive
architecture”, and the possibility of swapping parts rescued from some
other scrapped GM cars (BTW, he showed me his stock of EGR valves
rescued from other “deceased”).
Furthermore, he has the Mitchell Database System, with all manuals
data accessible in his PC.
Phone call Tuesday: He had tried another CPS, but no luck; next, he
had asked to borrow an ignition module from a friend, and was awaiting
for it.
Phone call Thursday: No luck with module. Was checking for corroded
connections into the PCM (computer); mostly because when connecting
the OBD scanner, it displays 63 RPM even is the key has not been
turned to turn on. He says that are generally about 300 RPM during
initial crank.
As a retired EE, I saw my good quote of anomalies originated from
spurious charges that get stored in some (not properly terminated or
loosely connected) ports in CMOS technology devices (I believe that
must be the technology of this PCM). These devils are, usually, very
temperamental and temperature, moisture, shock (and you name it)
dependant.
If all checked connections are OK, them we’ll have to conclude that it
might be the PCM.
He says it’s difficult to get another used one to swap, first because
my car is standard, and second because Saturn is history, and few cars
available nowadays.
Next phone call will be tomorrow, we’ll go from there.
YES, I have my fingers crossed!!!!!!!!

danielR.
  #13  
Old April 8th 10, 01:05 PM posted to rec.autos.makers.saturn
Oppie[_8_]
external usenet poster
 
Posts: 56
Default CPS, was Idle control Valve

"danielr" > wrote in message
...
> Car Fixed:
> Before categorically blaming the PCM, this mechanic checked all
> electric circuits leading to PCM, but found none deemed to be the
> culprit. Lastly, replaced the Crankshaft Position Sensor for another
> used one.
> Success!!.
> Before leaving this posting, I want to express my appreciation to all
> those who contributed with their comments and suggestions.
> Best regards.
>
> danielR.


Glad to hear you finally got a fix!

The Crank sensor, while it has diagnostic codes associated with it, rarely
seems to throw those codes when it becomes defective. It is the 'master'
timing element for all power train controls. When it gets flaky, it's more
likely to cause all sorts of 'phantom' codes that are totally unrelated to
the crank sensor. As I understand it, the sensor is a magnetically biased
coil that senses ferrous gear teeth on the crankshaft. Crank has a nominal
36 tooth pattern with one tooth missing to indicate TDC. PCM does a clock
regeneration and missing pulse detection to detect shaft position. (as a
fellow EE, you should appreciate that...)
Best Regards - Oppie

 




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