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1987 944 Turbo poor running while cold

My 87 951 has started to run poorly for the first few minutes now that outdoor temperatures are in the low 30s.
I was wondering if this car has a warm-up regulator, or would the fuel pressure regulator be the cause?

I am also trying to fix the cargo cover. My car has the older style cover with a flat metal end on the passenger's side and a pin at the other end.
The plastic pieces at the end of the tube that holds the cover broke and replacements are not available.
Would there be a cover from a VW or newer Porsche that can be modified or the end pieces used to fix this one?

Thank you for any advice you can provide.

RG
Old 01-10-2019, 10:37 PM
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No warmup regulator, but there are Inlet Air Temperature and Engine Temperature sensors. It more than likely is some small vacuum leak somewhere, but you can check your fuel pressure with a gauge if you think that is the issue.

There are aluminum replacement pieces available for the cargo cover caps available somewhere out there in the etherworld. Look around.
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'88 951S - with LBE, Guru chips, 3Bar FPR, 1.3mm shimmed WG, 3120 lbs, 256 RWHP, 15 psig boost
1987 924S 944 SPEC racecar - '88 pistons/DME, short 5th
1987 944S - Restored salvage title, ready to live again
Old 01-11-2019, 06:51 AM
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kdjones,
Thank you for your reply. I will look into the temperature sensors.
My car has a fuel rail pressure gauge. I will check there, if I remember correctly, the pressure should be around 50 psig.

I will look for the aluminum parts for the cargo cover. Would you have any idea where?

Thank you!
RG
Old 01-11-2019, 09:51 AM
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Here you go:

https://944online.com/index.php/catalogsearch/result/?q=cover+caps
Old 01-11-2019, 11:43 AM
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The engine temperature sensor tells the DME to en-rich the mixture while the engine is cold. Thus making starting easier and cold idle smoother.
More than likely you have a bad sensor or wiring to it.
Sox
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Old 01-11-2019, 12:28 PM
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Sox
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Old 01-11-2019, 12:35 PM
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Thank you both for the information.
I checked at noon time here (32 degrees) the fuel pressure gauge read 40 psig.
Is this within range? I thought it should be 50 psig.

I will look into the cargo fittings and temp sensor next.
Thank you for your help!
RG
Old 01-11-2019, 01:58 PM
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2.5 bar if stock, which is 36psig.

Sounds like you are running a 3.5bar FPR, which is 50.7psig

You should only get this when the vacuum line is removed and plugged.
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'88 951S - with LBE, Guru chips, 3Bar FPR, 1.3mm shimmed WG, 3120 lbs, 256 RWHP, 15 psig boost
1987 924S 944 SPEC racecar - '88 pistons/DME, short 5th
1987 944S - Restored salvage title, ready to live again
Old 01-11-2019, 02:45 PM
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Does car do fast-idle of 1200-1300rpms when you start?
Old 01-11-2019, 09:47 PM
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In case you wanted a Vac/boost relationship to the fuel pressure....
Sox

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Old 01-13-2019, 10:07 AM
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Quote:
Originally Posted by Raulg View Post
kdjones,
Thank you for your reply. I will look into the temperature sensors.
My car has a fuel rail pressure gauge. I will check there, if I remember correctly, the pressure should be around 50 psig.
What pressure did you actually measure at fuel-rail at idle?
Old 01-14-2019, 01:12 PM
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I had stumbling and low power issues when my '86 951 was cold. The problem mostly went away when warm. After replacing a few things, it turned out to be the oxygen sensor. Car runs great right after startup now. I think the change interval for the oxygen sensor is 60k miles.


As for the cargo cover, I used 90 metal brackets from the hardware store. I put a few holes in them and screwed them into the back of the rear seat. They sometimes rotate loose, though.

For the fuel pressure, look at Clark's article: http://www.clarks-garage.com/pdf-manual/fuel-01.pdf
. I don't think 40 psig is too far off. Mine is 34 while running IIRC.
Old 01-17-2019, 07:20 PM
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