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Offline shmed

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Re: starts an dies
« Reply #15 on: October 10 2016, 04:07:18 PM »
when the maf is unplugged an it does run   fuel pressure is at 42 line off.
 when it is running   the idle is around 1800????
 regardless of throttle plate stop location

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Offline shmed

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Re: starts an dies
« Reply #16 on: October 10 2016, 04:08:03 PM »
glad its our thanksgiving  and I'm cooking an drinking an doing garage things lol   the guests just love it  lol

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Offline earlbrown

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Re: starts an dies
« Reply #17 on: October 11 2016, 01:42:05 AM »
Quote from: shmed on October 10 2016, 04:04:51 PM
earl what is the  koef  test?    i did try key on engine off an af was at 4   then full  throttle still 4  is this what you mean?
      no translator  stock maf

You did it right.  If the MAF reading stays the same that means the ECM is communicating with the MAF.  If the number goes up as you push the throttle, that means the ECM is having to guess as the airflow and there's no communication.

That test can spin you out if you're running a Translator with a bad MAF. as it means the ECM is in contact with the Translator thinking it's talking to a MAF but there isn't any actual airflow data going to the translator.
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Offline daveismissing

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Re: starts an dies
« Reply #18 on: October 11 2016, 08:33:36 AM »
Glad to see Chuck is here.
You did check that the TPS is a reasonable voltage and not stuck?
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Offline larrym

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starts an dies
« Reply #19 on: October 11 2016, 02:16:09 PM »
I have had a similar symptom with a translator unplugged at the MAF check your wiring to the MAF


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Offline TexasT

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Re: starts an dies
« Reply #20 on: October 11 2016, 03:06:20 PM »
Quote from: daveismissing on October 11 2016, 08:33:36 AM
Glad to see Chuck is here.
You did check that the TPS is a reasonable voltage and not stuck?

I'm sure he read about the circle jerk and wanted to see what it was all about. Haha
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Offline shmed

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Re: starts an dies
« Reply #21 on: October 11 2016, 06:00:16 PM »
ok  am i on to something here or still spinning my wheels...


after speaking   with my helper...  he tells me he had the iac out an  it was stuck  so he unstuck it???    but said it worked fine near the end of last season??


SO  i unplugged the iac  an it started up  like its supposed to just rpm was in the 1500   area ??


ideas thoughts??



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Offline Steve Wood

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Re: starts an dies
« Reply #22 on: October 11 2016, 06:09:04 PM »
the IAC is a solenoid.  Trying to fix it probably broke the plunger connection some how??
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Offline Scoobum

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Re: starts an dies
« Reply #23 on: October 11 2016, 06:14:18 PM »
Shmed, I think you can still buy the IAC from the dealer. Got a new one for my car a few years back.
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Offline daveismissing

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Re: starts an dies
« Reply #24 on: October 11 2016, 06:35:56 PM »
Its a bipolar stepper motor inside ,must turn a screw like part inside to move the visible part in and out a tiny bit. Dunno how one would even unstuck-it.
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Offline daveismissing

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Re: starts an dies
« Reply #25 on: October 11 2016, 08:26:53 PM »
Rockauto show them for $25-55 CDN. seem readily available
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Offline earlbrown

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Re: starts an dies
« Reply #26 on: October 11 2016, 08:48:16 PM »
Quote from: daveismissing on October 11 2016, 06:35:56 PM
Its a bipolar stepper motor inside ,must turn a screw like part inside to move the visible part in and out a tiny bit. Dunno how one would even unstuck-it.

I was thinking the late 80's F-bodys had the threaded ones you could adjust but ours was fixed.

That being said, years ago I noticed one in the junkyard on a plain ole shitbot GM beater car and grabbed it.  It works fine on my GN to this day.
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Offline Just a Six?

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Re: starts an dies
« Reply #27 on: October 12 2016, 06:44:38 AM »
Blast off the carbon if dirty with some Brake Cleaner etc & try it again. Can`t hurt.
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Offline shmed

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Re: starts an dies
« Reply #28 on: October 12 2016, 04:26:51 PM »
well replaced it with a new one  no change   starts then dies??


could this be a vacuum leak ??? 
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Offline daveismissing

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Re: starts an dies
« Reply #29 on: October 12 2016, 06:06:47 PM »
And still runs at 1500 if you unplug IAC?
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