924Board.org

Druman · Joined: 19 Mar 2007 Posts: 419 Location: Middleport, Ohio

Ok so for my 944 Auto Zone sold me a WR7DC but my owners manual says I need WR8DS, could this be causing my car not to start? My plugs are BLACK! Thanks guys.

7osh
_________________
87' 924S non-sunroof (Red) 45K miles
85' 944 "early" NA (Red) 130K miles

PORSCHE pisses excellence...

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

AZ vs. Porsche, I might be tempted to take Porsche's advice.
_________________
Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

Druman · Joined: 19 Mar 2007 Posts: 419 Location: Middleport, Ohio

yeah, I got some champions that crossed over to the correct number, but still nothing

7osh
_________________
87' 924S non-sunroof (Red) 45K miles
85' 944 "early" NA (Red) 130K miles

PORSCHE pisses excellence...

ic932 · Joined: 11 Feb 2005 Posts: 1104 Location: UK

PET says WR7DC.....

Smoothie · Posted: Wed Dec 10, 2008 9:47 am Post subject:

The one ending in "DS" is a silver plug, while the other ("DC") is copper (both are excellent conductors). -And there's only one heat range difference between the two. While heat range is important (you want the plugs to get hot enough to self-clean, but not so hot that they cause [pre-ignition

]), I seriously doubt that it's causing a no-start problem. Of course the black deposits on the plugs suggest a too rich mixture...maybe a bad o2 sensor?
_________________
"..it's made in Germany. You know the Germans always make good stuff."

'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox

Druman · Joined: 19 Mar 2007 Posts: 419 Location: Middleport, Ohio

Yeah, I tried a set of Champions that crossed over to the WR8DS, still won't start, I guess the next thing I need to check would be either distributor cap, wires, or coil eh?

7osh
_________________
87' 924S non-sunroof (Red) 45K miles
85' 944 "early" NA (Red) 130K miles

PORSCHE pisses excellence...

Rich H · Posted: Wed Dec 10, 2008 6:29 pm Post subject:

The plugs don't make much difference when starting as long as they are intact adn sparking, the heat range is more to do with later on after warm up is complete. Check the whole ignition system (Don't replace it of hand) all the way from the sparkers to the ignition unit.
_________________
1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec

Druman · Joined: 19 Mar 2007 Posts: 419 Location: Middleport, Ohio

Thanks Rich, I'm gonna try the wires, distributor cap, and coil from my 924S to see if one of those is the problem. I wondered about the shims on the spark plugs tho, are they necessary on these cars? Could they be pulling the plug away from the piston to much?

7osh
_________________
87' 924S non-sunroof (Red) 45K miles
85' 944 "early" NA (Red) 130K miles

PORSCHE pisses excellence...

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

Druman · Joined: 19 Mar 2007 Posts: 419 Location: Middleport, Ohio

Well I guess the spark plugs weren't the problem, it ended up being either a crankshaft or camshaft positioning sensor. Thanks for your help fellas.

7osh
_________________
87' 924S non-sunroof (Red) 45K miles
85' 944 "early" NA (Red) 130K miles

PORSCHE pisses excellence...

mehall · Joined: 15 Dec 2008 Posts: 191 Location: Richmond, MO

How did you decide it was a crank shaft or sensor?

Black plugs seem indicate that they are fouled by too rich fuel mix.

Thanks.

Mark
_________________
Mark

'87 White 924s manual
'94 Lexus LS400

www.kcws.org

Druman · Joined: 19 Mar 2007 Posts: 419 Location: Middleport, Ohio

I changed it out of my 924S and it started working haha. When I took them out they were covered with blackness, I cleaned them put them back in and they still wouldn't work so I changed them. Hope this helps.

7osh
_________________
87' 924S non-sunroof (Red) 45K miles
85' 944 "early" NA (Red) 130K miles

PORSCHE pisses excellence...