1982 porche 924 turbo not firing

bongmongy · 12-08-2009, 09:19 PM

need some help! i have a 1982 924 turbo thats getting no fire to the spark plugs i have put on a new coil, distributor cap, plugs, wires, ignition module, and crank sensor pulling my hair out here! when it cranks over i can smell gas so i think it is getting gas can the computer under dash cause no spark? or what can it be?

924RACR · 12-09-2009, 05:05 AM

Welcome to the joy of the 931's DITC ignition system.

Most likely the crank sensor is the issue. It's located at the back of the engine on the bellhousing, directly below the ignition coil. Make sure the wiring is not damaged, and clean the contacts on the ignition module (which we call the DITC) on the center tunnel "behind" (actually in front, relative to the car) the radio. The two plugs on it are accessed in the driver's side footwell.

If you are getting a crank signal, you should see the tach move when you crank the engine.

You should also a) go to the 924board.org discussion forums, where the 924 and 931 experts live, b) unplug the fuel pump relay so you stop filling the crankcase with gas, and c) change the oil - it's very likely diluted with gas and useless for lubrication by now.

Also - did this car ever run, and just stop, or are you restoring it?

Have you changed the timing belt yet? If not, you must, or look forward to bending a set of irreplaceable valves.

etc etc...

bongmongy · 12-09-2009, 09:24 AM

ok, so are you talking about the tach inside of the car? car is not a restore the car did run and it set in a garage for 2 years and now it wont start no spark on the plugs but it was real damp in the garage alot of moisture the box your talking about down in the foot well can this go bad and cause no spark?

you have been a great help so far

thanks

924RACR · 12-10-2009, 05:19 AM

The tach inside the car on the dash, yes.

It's not so much that the DITC can go bad, but that corrosion on the connectors can keep it from working. Or the sensor itself can go bad... in which case you're F'ed, time to convert to EFI, as the sensors are no longer available... unless you can find a good used one. But they're rare, since the cars are rare.

I think you should read my post here before you go any further:
924Board.org :: View topic - 931 Resuscitation - how to resurrect a long-dead turbo

Certainly, you can focus on the electrical/ignition stuff, before spending any more money. But you should read it all.