97 Boxster crank no start

[Justin Boisclaire]

Ok so here is the deal, i installed a new Double din stereo and now I have no spark and no fuel pressure. I can jumper the fuel pump and it turns on. I sprayed starting fluid into throttle body and nothing. I checked for spark and i have nothing. I replaced the crank position sensor and still no change....so i need to be pointed in the right direction for diagnosis...

[JFP in PA]

12 hours ago, Justin Boisclaire said:

Ok so here is the deal, i installed a new Double din stereo and now I have no spark and no fuel pressure. I can jumper the fuel pump and it turns on. I sprayed starting fluid into throttle body and nothing. I checked for spark and i have nothing. I replaced the crank position sensor and still no change....so i need to be pointed in the right direction for diagnosis...

 

Year and model please................

[Ahsai]

Have you checked fuses C1-C4 and E1?

[Justin Boisclaire]

1997 986 2.5 manual transmission. I have checked all the fuses and they are all good. It is very strange that even with the new cps i still have no bouncing on the rpm needle when it cranks....

I promise when I find the solution to this it'll be posted on this website so if anyone's following This Thread keep watching I'll make sure that it gets posted

Edited April 13, 2018 by Justin Boisclaire

[JFP in PA]

OK, let's try a long shot:  When you replace the radio, did you ground the radio anti theft wire?  The central locking control unit may be responding to what it thinks is someone trying to steal the radio or the car..............

[Justin Boisclaire]

No i did nothing with the wire. When i get home i will ground it and report back. I really appreciate any ideas and comments!

[Justin Boisclaire]

I grounded the wire and it still doesn't start

[JFP in PA]

The car is behaving as though the anti theft system thinks you are trying to steal it, and is shutting off the fuel and spark.  You need to go back over your radio install and look for anything that would lead to this.  Do you have access to a Porsche specific scan tool?  It would be interesting to see if there is an open circuit somewhere in the security system.

[Justin Boisclaire]

No I can get a different type of scan tool

[JFP in PA]

Just now, Justin Boisclaire said:

No I can get a different type of scan tool

 

That won't do it, it needs to be Porsche specific (PST II, PIWIS, Durametric System).

[Ahsai]

In the meantime you can check the following with key ON engine OFF to make sure these get power to them. These verify DME relay and ignition relay.

MAF pin 2-> +12v

Any black wire of any O2 sensor (car harness side with the O2 sensor disconnected) -> +12v
 

[Justin Boisclaire]

A Snap-on Solus will not be able to fully read the 986?

[Loren]

25 minutes ago, Justin Boisclaire said:

A Snap-on Solus will not be able to fully read the 986?

 

No - Porsche has Porsche specific codes (just like MB, BMW, and just about all car makers).

[Justin Boisclaire]

Maf and o2 are getting 12v. Is the DME the fuel pump relay? And where is ignition relay?

[Ahsai]

No, the fuel pump has its own relay. Both DME and ignition relays are under the rear seat parcel panel. Since you have power to the MAF and O2, you have power to the injectors and coils. The only reason you don't have sparks is because the DME is not grounding the injectors and coils. This is also consistent with no tach needle bounce while cranking. Are you sure the CPS connection is tight?

 

If not the CPS, it'll be back to the alarm/immobilizer system.

[Justin Boisclaire]

DME has power, i will check the cps connection.

 

THANK YOU for the help so far!!!

[Ahsai]

Yes, DME has power for sure because it activates the start-lock relay (assume stick shift) to allow power to reach the starter. What I found odd is if the alarm system is trying to prevent the car from being stolen, why does it allow the engine to crank.

[Justin Boisclaire]

Cps is plugged in correctly!

[Justin Boisclaire]

Start lock has been jumpered...

[Ahsai]

3 minutes ago, Justin Boisclaire said:

Start lock has been jumpered...

You mean the microswitch on the clutch pedal?

[Justin Boisclaire]

There is no relay for startlock, just a wire bypassing it

[Ahsai]

Ok, that means you hard wired the starter to crank then. I agree with John it's something the alarm doesn't like then.

Edited April 14, 2018 by Ahsai

[Justin Boisclaire]

Any recommendations? Check cps voltage?

[Ahsai]

What happens if you remove all the jumpers, reinstall the start lock relay and crank? Will the engine crank?

 

Can you try another key? Not much to check before you can scan the car with piwis or Durametric.

[Justin Boisclaire]

Remove all the relays in the back trunk? Not sure which jumpers you mean. 

 

Can i rent a durametric somehow?