Can not get it to start AHHGGG!!!

944 superstar · 09-26-2006, 03:07 AM

Hello i have come to a dead end with my Porshe 944 2.5s... Now i have only owed it for a few months and its been fine,, i had the cam belt done two weeks ago and have had it serviced and its been running sweet,,,,,,

the Other day it would not start and it still wont start i have tried everything and there is no spark no electric going to the coil tried jump starting.. does any one have any idea it will go to turn over but wont fire up help please i miss driving her..

prooutlaw · 09-26-2006, 05:15 AM

Have you checked the DME relay ?

944 superstar · 09-26-2006, 05:21 AM

Quote:

Originally posted by prooutlaw
Have you checked the DME relay ?

Thank you for your reply... What is the DME relay how does this work and where should i check for it,, I don't have a manual.. any advice would be greatly apreciated.

prooutlaw · 09-26-2006, 05:28 AM

What year is the car ?
If it is 85.5 and up the relay is in the fusebox under the hood (driver side next to the windshield)

prooutlaw · 09-26-2006, 05:30 AM

Check out this Post :
http://forums.pelicanparts.com/showthread.php?threadid=304595

924Sman · 09-26-2006, 05:54 AM

DME relay is not going to help if no spark is there. This relay is to the fuel pump. Could still be an issue but the spark needs to be there as well.
Try a new coil.
Check the battery for 12V
Re check the timing, if off it will not fire properly or at all.
Test the ignition switch by running a jump wire IIRC from the +battery terminal to the black wire on the coil. If it fires the switch is shot.
Check the speed and reference sensor connections, wiggle and start. These are located dead center of the rear of the engine. 2 square black connectors mounted on a metal bracket. The O2 sensor is there as well and is cylindrical in shape. Look to the left of the oil fill cap(yellow) near the firewall for these sensors.

Last but not least get a manual and check out www.clarks-garage.com click shop manual.

GL!

Dal

944 superstar · 09-26-2006, 06:28 AM

Thank you Guys for all your comments, I certainly have plenty to check when i get home.

The car is a Y plate, over here thats 1983... hopefully she will run again... I am not getting a spark and i have changed the coil the timming was only done 2 weeks ago when new cam belt was fitted!!

Looks like it may be the speed ref sensor or the o2 sensor as 924Sman pointed out cheers... i will let you know how i get on...

924Sman · 09-26-2006, 06:52 AM

No not the O2 sensor, I just used the description because of it's relevant location and not to get confused as to which is which. 3 sensor connection grouped together, you want the square plugs.

Check the ground points, see the shop manual for the locations, clean and tighten them. This includes the +/- battery terminals, check for corrosion. Check the small 10 guage wire on the + battery terminal also for corrosion.

Are the green and black coil leads on the correct posts?

Dal

944 superstar · 09-26-2006, 07:03 AM

Sorry got a bit confused there, i see what you meen now... thanks again for your help

luke

Britwrench · 09-26-2006, 12:04 PM

The DME relay controls the ECU and the fuel system...if it doesn't work there is no spark. If you do a compression test, then pull the DME relay which kills everything. The DME relay is on the top row of the relay board. There is an updated part now; 993 615 227 00

Haynes does a manual for this car, the 924 manual by Haynes covers a lot of the body parts too. Also make sure you have the owner's book too.

924Sman · 09-26-2006, 12:47 PM

Britwrench.....Hey thanks for the correction on the relay. Did not know the relay also included spark. Mine sparked w/o but forgot the thing was jumpered so that fact was not in my mindset.

Razorback1980 · Razorback1980's Garage

Do a search for a post from user "SoCal Driver" and search for a string called "five minute test". This will provide you a complete step by step way to locate your problem. If you still have issues after going through this procedure, then provide that information back. This being an 83, the DME relay is in a different location I think but I have a later 944, so I'm not sure where it is. It's been posted many many times in here, so do a search and you'll find a large number of posts on the subject.

Also check out Clarks-garage.com and go to the manual section, you will find more information and better organized than a lot of the manuals you can buy, but pick up a Haynes manual anyway, there are some good things in there.

Welcome to the forum.

SoCal Driver · SoCal Driver's Garage

The ignition switch provides the voltage directly to the coil and the DME relay to close it's first set of contacts. The DME relays first set of contacts provide current to the DME and the injectors.

So when you turn on the key and check with a volt meter the small black wire at the coil you are checkint that the ignition switch is working. When there is voltage at the coil you then check any one of the injector connectors to see if it has voltage. If the injector has voltage then you know that the DME relay has closed the first set of contacts. When the injectors have voltage the DME has voltage because the voltage comes from the same location.