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Join Date: Aug 2007
Posts: 6
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starting problem
1984 944 engine turns over but wont fire.new plugs distributor.tested coil checks out.Any suggestions or ideas!
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08-24-2007, 12:43 PM
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meister member
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Does the tach bounce while you are cranking the starter?
Speedy 
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1983 944 guards red with 16" Fuchs, Host of Wisconsin area timing/ balance shaft belt tensioning party 1987 944S Purchased from Legion. Corvette LT-1 V-8 conversion with Mega Squirt II Check on progress ---> www.porschehybrids.com/gallery/speedracing944 Favorite Road = www.tailofthedragon.com 318 turns in 11 miles (11 min 20 sec best run) |
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08-24-2007, 01:08 PM
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Hi, are you getting spark to plugs and fuel to injectors?
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08-24-2007, 01:56 PM
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the tach wont move and its not geting a spark to the plugs and injectors.
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08-24-2007, 05:30 PM
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Clark's Garage has a good write up on checking the resistance of the Speed and Reference sensor. It's easy if you have a multi-meter or ohm-meter.
Since the Tach doesn't bounce, it could be a reference sensor problem.
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Jake 1983 Euro 944 (Mine) 2000 BMW 323i (Hers) 1997 Sentra (unclaimed!) |
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08-24-2007, 06:05 PM
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Hi, maybe try using a known good DME relay and maybe a DME as well and see if you get spark then?
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08-24-2007, 07:34 PM
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If the tach doesn't bounce it sounds kinda like the reference sensors to me. I had a simillar experience where I had fuel and no spark. Turned out the connection on the refference sensors was bad. Check that connection...maybe you'll get lucky.
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Brian '86 944 NA '94 Jeep Cherokee 3" and 31's '86 Chevy C10 425hp '98 Dodge Neon (the wife) |
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08-24-2007, 07:41 PM
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Location: new york
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Yeah check the connections for the speed and referance sensor coming from next to the firewall... Then ifthat dowsn't work go to clarks and start testing it with a multimeter...
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 1986 PORSCHE 951 3.0 project has begun!1989 IROC-Z(Show Car) 1961 Willys Jeep w/ 283 chevy(straight open headers) 1995 Dodge Ram 2500 HD 1981 Corvette 4spd |
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08-24-2007, 08:55 PM
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thanks ill give that a try
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08-24-2007, 10:11 PM
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Location: Falls Church, VA
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I'm not sure the "tach bouncing" thing is necessarily an indicator; my tach doesn't register when cranking and my car runs fine.
Incidentally, one thing I've noticed is that no matter how well tuned the engine is, when starting the car the engine always cranks for a second of two before the engine fires up. I assume that this is intentional to help the engine build oil pressure before it goes under load? nate
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1988 944... and a bunch of other cars
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08-25-2007, 06:39 AM
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1983 Porsche 944NA 2.5
