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gauge coolant sensor differences
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jvandyke  



Joined: 31 Mar 2016
Posts: 193
Location: Hudsonville, MI

PostPosted: Thu Apr 20, 2017 7:03 am    Post subject: Reply with quote

still trying to get temp and fuel gauges happy, can't find the ground point up under the dash, we had erratic readings from both for a while, now nothing, really suspect the grounds, where is that grounding point?
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87 924S project, '83 944 engine,
my son's first car.
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jvandyke  



Joined: 31 Mar 2016
Posts: 193
Location: Hudsonville, MI

PostPosted: Fri Apr 21, 2017 1:03 pm    Post subject: Reply with quote

pulled gauge, disassembled, could tell right away that wasn't the problem, all was tight and clean, lost a gauge light in the battle
All the other idiot lights in that pod are fine so why the temp and fuel are inop is just weird, the temp gauge does "energize" with the key coming on, the needle snaps up to attention but never moves with engine operation, the fuel gauge is totally dead which is very strange since it worked badly, then I messed with the sender then it worked fine, then it went dead, could be two unrelated problems, like bad temp temp sender and bad fuel sender at the same time
later that night
pulled wire off sender on engine block, grounded it, needle maxed, then used on old potentiometer and needle followed my adjustments
I guess it's the sender.
Anyone want to trade for the '87 924s sender we bought a few months ago and won't fit our '83 944 block?
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my son's first car.
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hdrider19  



Joined: 03 May 2016
Posts: 193
Location: Catawissa Missouri(40 mi sw of St Louis)

PostPosted: Mon Apr 24, 2017 2:59 am    Post subject: Reply with quote

Have you thought about drilling the hole in the block and tapping to correct thread for the 924S sensor? That is what I will do on mine I plan to have my wife hold a shop vac hose by the drill bit to keep chips out of the water jacket.
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Rasta Monsta  



Joined: 12 Jul 2006
Posts: 11332
Location: PacNW

PostPosted: Mon Apr 24, 2017 3:39 am    Post subject: Reply with quote

Did you check the big ground cluster under the intake?
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Toofah King Bad
  • Shaggy (1980 931) - Got Boost?
  • Red (1987 924S) - Pro44/Spec944
  • Weiße Scheiße (1987 924S) - In Progress
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jvandyke  



Joined: 31 Mar 2016
Posts: 193
Location: Hudsonville, MI

PostPosted: Mon Apr 24, 2017 8:47 am    Post subject: Reply with quote

Rasta Monsta wrote:
Did you check the big ground cluster under the intake?

Where is this exactly? Could be a problem. We lost everything to an engine fire before we were really familiar with the car so it could easily be I missed something obvious.
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87 924S project, '83 944 engine,
my son's first car.
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jvandyke  



Joined: 31 Mar 2016
Posts: 193
Location: Hudsonville, MI

PostPosted: Mon Apr 24, 2017 8:51 am    Post subject: Reply with quote

hdrider19 wrote:
Have you thought about drilling the hole in the block and tapping to correct thread for the 924S sensor? That is what I will do on mine I plan to have my wife hold a shop vac hose by the drill bit to keep chips out of the water jacket.


I did but I don't think it's a sender/gauge mismatch anymore. I think it's just a bad circuit--bad sender/bad ground. I ordered a new early 944 sender and with a new sender and more ground chasing we'll go from there.
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87 924S project, '83 944 engine,
my son's first car.
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Rasta Monsta  



Joined: 12 Jul 2006
Posts: 11332
Location: PacNW

PostPosted: Mon Apr 24, 2017 9:24 am    Post subject: Reply with quote




_________________
Toofah King Bad
  • Shaggy (1980 931) - Got Boost?
  • Red (1987 924S) - Pro44/Spec944
  • Weiße Scheiße (1987 924S) - In Progress
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jvandyke  



Joined: 31 Mar 2016
Posts: 193
Location: Hudsonville, MI

PostPosted: Mon Apr 24, 2017 9:32 am    Post subject: Reply with quote

Rasta Monsta wrote:




oh, yes, the main grounds by bell housing, got those clean on tight, thought maybe there were more, thanks though
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87 924S project, '83 944 engine,
my son's first car.
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jvandyke  



Joined: 31 Mar 2016
Posts: 193
Location: Hudsonville, MI

PostPosted: Wed Apr 26, 2017 10:13 am    Post subject: Reply with quote

new sender arrived, installed; all good, thanks for the input everyone, just to clarify, it seems the early 944 sensor (pre '85?) the "button style" works with the later 924s gauge, at least on test run around the block it read in the middle of the gauge where you'd think it would be.
What a lot of red herrings.
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