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Registered User
Join Date: Mar 2013
Location: DeWinton, AB
Posts: 72
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Cold start problems
I have some intermittent cold start issues. About twice now in last month i have got no start on cold start up. Turns over ok and getting fuel. Both times i have been able to get it going with simply waiting and starting later. It has only let me down in the garage.
I had previously cleaned all grounds and this time replaced critlcal ignition relays. Previous symptoms included some hesitation periodically until warmed up. Driving conservatively until warm up worked well. No issues at operating temp. I suspect temp II sensor. I checked the ohms at 5700-6000 at ambient (15c) which is close to spec i believe but it read 3200 ohms at operating temp - which is far too high. Any second opinions? Could it be maf or other sensor(s)?
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Steve 86 928 Euro 5 sp Red/Blk 63 E-type, 63 Valiant 12 MB C63, 12 MB ML350 |
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06-09-2014, 07:30 PM
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Location: Texas
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Sounds like Temp II to me.
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John Curry (Drift King) 928OC member Grand Prix White 1994 GTS AT (The GTS) Black 1989 GT (The GT) and Cobalt Blue 1989 S4 AT (The Blue Car) 1986 Euro AT Indishrot 1984 Euro S AT (The Stepson) and Black Metallic 1984 Euro S 5 speed (The Schwartz) |
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06-09-2014, 07:41 PM
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1979 5sp 928 project
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I just had the same problem with my 84. I'm not sure what year yours is but as long as it's not a 78, 79 or Euro CIS machine it will most likely be your thermo temp switch. It is mounted horizontally just in front of and below the temp 11 switch. The thermo temp switch fires up your cold start injector on ignition. It it fails then you have no cold start injector. The temp II upon failing will cause rich running because the cold start injector won't shut off at all.
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1979 928 5sp project 1984 928S 5sp black on black |
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06-10-2014, 05:59 AM
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Registered User
Join Date: Mar 2013
Location: DeWinton, AB
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Its an 86 euro with Australian spec 28.45 engine. I know the standard WSM and parts CD I have list a temp time switch but I cannot positively find one on this engine - or I am possibly confusing it with the temp gauge sensor. There is a horizontal sensor off the thermostat housing just behind the engine bay cross member - but this one doesn't have the electrical connection like the temp 2 sensor has and what is shown in the WSM, but a simple two prong.
I will take a further look tonight when I get home - if I find one, I will order two new sensors and replace both.
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Steve 86 928 Euro 5 sp Red/Blk 63 E-type, 63 Valiant 12 MB C63, 12 MB ML350 |
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06-10-2014, 08:03 AM
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Registered User
Join Date: Mar 2013
Location: DeWinton, AB
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No temp time switch sensor on the thermostat housing. Only temp 2 and temp gauge. Will replace temp 2 if i can find one. Different part number listing for this engine than most others.
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Steve 86 928 Euro 5 sp Red/Blk 63 E-type, 63 Valiant 12 MB C63, 12 MB ML350 |
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06-10-2014, 06:35 PM
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1979 5sp 928 project
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Here are a few pictures of the switches
The first is the Temp II switch   and here is the Thermo temp or time switch. I'm pretty sure you have already found them, but pictures are fun anyway. 
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1979 928 5sp project 1984 928S 5sp black on black |
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06-11-2014, 09:32 AM
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1979 5sp 928 project
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Not sure what the one is behind the temp II switch.
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1979 928 5sp project 1984 928S 5sp black on black |
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06-11-2014, 09:33 AM
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Registered User
Join Date: Mar 2013
Location: DeWinton, AB
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Yeah - I don't have that one in your last picture. See below. I got the temp II which is left of the filler cap, the vertical gauge sensor which is right of the cap and left of the fuel regulator and then there is a horizontal one at 2 o'clock position above the filler cap that actually goes into the air intake. I would put arrows on the picture pointing to these if I knew how
 
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Steve 86 928 Euro 5 sp Red/Blk 63 E-type, 63 Valiant 12 MB C63, 12 MB ML350 |
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06-11-2014, 10:37 AM
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Registered User
Join Date: Mar 2013
Location: DeWinton, AB
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Quote:
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Steve 86 928 Euro 5 sp Red/Blk 63 E-type, 63 Valiant 12 MB C63, 12 MB ML350 |
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06-11-2014, 10:40 AM
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Registered
Join Date: Mar 2010
Location: Texas
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Boise,
I'm not sure that LH equipped cars have that thermo time sensor. I know the Stepson ('84 Euro) doesn't have it.
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John Curry (Drift King) 928OC member Grand Prix White 1994 GTS AT (The GTS) Black 1989 GT (The GT) and Cobalt Blue 1989 S4 AT (The Blue Car) 1986 Euro AT Indishrot 1984 Euro S AT (The Stepson) and Black Metallic 1984 Euro S 5 speed (The Schwartz) |
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06-11-2014, 02:08 PM
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1979 5sp 928 project
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Hmmm....And yet another mystery.
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1979 928 5sp project 1984 928S 5sp black on black |
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06-12-2014, 06:29 AM
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Registered User
Join Date: Mar 2013
Location: DeWinton, AB
Posts: 72
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Changed the temp II sensor last week and cold start/driving issues are gone - so far.
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Steve 86 928 Euro 5 sp Red/Blk 63 E-type, 63 Valiant 12 MB C63, 12 MB ML350 |
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06-22-2014, 03:10 PM
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Registered
Join Date: Mar 2010
Location: Texas
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Good news there reddog2!
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John Curry (Drift King) 928OC member Grand Prix White 1994 GTS AT (The GTS) Black 1989 GT (The GT) and Cobalt Blue 1989 S4 AT (The Blue Car) 1986 Euro AT Indishrot 1984 Euro S AT (The Stepson) and Black Metallic 1984 Euro S 5 speed (The Schwartz) |
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06-22-2014, 07:38 PM
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Registered User
Join Date: Mar 2013
Location: DeWinton, AB
Posts: 72
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It is always good news when you solve these problems for under $100!
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Steve 86 928 Euro 5 sp Red/Blk 63 E-type, 63 Valiant 12 MB C63, 12 MB ML350 |
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06-23-2014, 06:48 AM
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Network Native
Join Date: Jan 2007
Location: SoCal
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Quote:
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US 83 zinc metallic 5 spd, aka the nice car. Euro 85 black, 5 spd, the fast rough track car maybe car. SOLD Euro 84 red, AT, only car in garage in years, my parts car, soon to go last 7 years. Last edited by Danglerb; 06-23-2014 at 01:43 PM.. |
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06-23-2014, 01:40 PM
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