What have I done to offend the gods?
01-13-2009, 10:06 PM
#46
Drifting
Just found a thread on the 996 forum someone using a VW ignition switch part in their 996 for only $30
John
01-13-2009, 11:50 PM
#47
"Cal, I missed the part where you diagnosed the "no spark" condition. How did you test that, and did you see if you are getting power to the fuel pump by jumpering the dme relay socket?"
rusnak
If it's a "no spark" condition, let's not have the troubleshooter testing
for power to the fuel pump. Using the "shotgun" approach to troubleshooting
wastes time and can potentially waste mone!
"I have read the injectors can short out and cause a no spark."
Not actually. An injection short can result in no injector signal but it won't
affect the spark.
Here's a very simple test procedure you can use without your DME ECM:
1. With the key "on", check that pins 1, 18, & 35 all have 12 volts,
i.e. best done with a basic test light ~ $10-$15. Check for ground
at pins 5, 16 & 17.
2. Using an ohmmeter, check for approximately 1000 ohms between
pins 8 & 27 and pins 25 & 26. Then with a voltmeter set to A.C. volts,
check that the A.C. volts between pins 8 & 27 is greater that 1.0 V.A.C
while the engine is cranking. Then check between pins 25 & 26 for about
.100 V.A.C. when cranking. Make sure that the sensors are NOT reversed
at the engine bracket.
3. Again using the test light, make sure the coil has 12 volts.
4. Once the DME ECM is re-installed, remove the coil wire from the
distributor cap and place it about 10mm from the engine case.
5. Have someone crank the engine while using the test light to check
for a signal at one of the two coil connections. If you get a flashing
signal, then check that the coil wire has a spark.
6. Next remove an injector connector and check for 12 volts.
If you have an injector tester (light), you can test for injector
pulses while cranking.
Report back once you have done the above.
Note: As mentioned previously, your DME ECM is NOT the problem!
rusnak
If it's a "no spark" condition, let's not have the troubleshooter testing
for power to the fuel pump. Using the "shotgun" approach to troubleshooting
wastes time and can potentially waste mone!
"I have read the injectors can short out and cause a no spark."
Not actually. An injection short can result in no injector signal but it won't
affect the spark.
Here's a very simple test procedure you can use without your DME ECM:
1. With the key "on", check that pins 1, 18, & 35 all have 12 volts,
i.e. best done with a basic test light ~ $10-$15. Check for ground
at pins 5, 16 & 17.
2. Using an ohmmeter, check for approximately 1000 ohms between
pins 8 & 27 and pins 25 & 26. Then with a voltmeter set to A.C. volts,
check that the A.C. volts between pins 8 & 27 is greater that 1.0 V.A.C
while the engine is cranking. Then check between pins 25 & 26 for about
.100 V.A.C. when cranking. Make sure that the sensors are NOT reversed
at the engine bracket.
3. Again using the test light, make sure the coil has 12 volts.
4. Once the DME ECM is re-installed, remove the coil wire from the
distributor cap and place it about 10mm from the engine case.
5. Have someone crank the engine while using the test light to check
for a signal at one of the two coil connections. If you get a flashing
signal, then check that the coil wire has a spark.
6. Next remove an injector connector and check for 12 volts.
If you have an injector tester (light), you can test for injector
pulses while cranking.
Report back once you have done the above.
Note: As mentioned previously, your DME ECM is NOT the problem!
01-14-2009, 12:27 AM
#48
I haddah Google dat
Rennlist Member
Rennlist Member
you're the one assuming he has no spark. I was asking how he came to that conclusion, as you have already quoted me. And he already changed the fuel pump at this point, what money wasting are you referring to exactly?
01-15-2009, 11:02 AM
#49
Burning Brakes
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I thought while waiting for the DME I would ad a little information. I thought I would remove the old Clifford alarm (have I posted this already?).
This is a heads up for anyone that has old after market items such as an old alarm. The electrical tape is 25 years old and after years it turns to a goo like substance if not applied correctly.
I found wire connections with little wrap on them and (of course) they were non factory wires.
Oddly, I was walking my best buddy and saw a fellow about my age (not so young) working on installation of a hands free in a car at the neighbors.
Turns out he is a Porsche guy and has been in the auto electirc biz since the eighties and he does mobile so he comes to the house.
I am going to have him clean up and remove any non factory item from the the car.
So this non start led to the discovery of wires that may have cause me problems in the future or now, for all I know.
Funny how things work.
This is a heads up for anyone that has old after market items such as an old alarm. The electrical tape is 25 years old and after years it turns to a goo like substance if not applied correctly.
I found wire connections with little wrap on them and (of course) they were non factory wires.
Oddly, I was walking my best buddy and saw a fellow about my age (not so young) working on installation of a hands free in a car at the neighbors.
Turns out he is a Porsche guy and has been in the auto electirc biz since the eighties and he does mobile so he comes to the house.
I am going to have him clean up and remove any non factory item from the the car.
So this non start led to the discovery of wires that may have cause me problems in the future or now, for all I know.
Funny how things work.
Last edited by cal44; 01-15-2009 at 07:39 PM.
01-15-2009, 12:51 PM
#50
Rennlist Member
cal: I would have suggested that you look for old alarm components (especially in the trunk under the cowl, and under the passenger foot board), but that usually only applies if the battery has been removed, then hooked up, then the crank but no-start happens.
Clifford's were pretty reliable, but I've seen some horrible installations!
Clifford's were pretty reliable, but I've seen some horrible installations!
01-15-2009, 03:21 PM
#51
Burning Brakes
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Just got a call from Otto's. Nothing wrong with the DME. So as soon as it gets to the house I will have the tech drop over. He thinks as "Mr. Z" that it may be the old Clifford as they used to install to where it would not start. Will report in a week. Tired now
01-15-2009, 07:48 PM
#54
Burning Brakes
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Mr. Z, got it....post 37. I will say that I released the nut on the fuel rail and fuel came out and when I put in the new fuel pump I had my share of fuel in my face. Then I discovered hose pinch pliers.....duh.
One more thing, when I turn over the engine I can smell fuel at the tailpipe. This is a good indicator of my desire to own and drive these cars. In the past if a hobby car gave me this kind of trouble I would have sold it "now". But these darn Porsches have gotten under my skin. Signed, an Addict.
Thank you Rusnak
One more thing, when I turn over the engine I can smell fuel at the tailpipe. This is a good indicator of my desire to own and drive these cars. In the past if a hobby car gave me this kind of trouble I would have sold it "now". But these darn Porsches have gotten under my skin. Signed, an Addict.
Thank you Rusnak
01-17-2009, 10:37 AM
#55
Burning Brakes
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Got the (good) DME back from Ottos and will install this afternoon. Electric tech to be out on Tues. morning to remove 25 year old items I didn't invite. I have decided not to touch anything further until tech looks. Then we will see.
01-20-2009, 06:24 PM
#56
Burning Brakes
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Here is the latest. The tech showed up and had the car running in one hour. What was it? The old non factory alarm. Wires with electrical tape falling off. He is getting rid of all non factory items and fixing what past fingers had done. The good thing is this guy knows Porsches. Talk about dumb luck running into him while walking my dog.
Heads up for those with old alams. As soon as the noodles (I can't spell spegetti) were cleared out the six sprang to life. What a relief. Thanks all all that helped. I got new parts I didn't plan on buying but whata ya gunna do? I will report on Pelican as those folks were helpful as well. Mike
Heads up for those with old alams. As soon as the noodles (I can't spell spegetti) were cleared out the six sprang to life. What a relief. Thanks all all that helped. I got new parts I didn't plan on buying but whata ya gunna do? I will report on Pelican as those folks were helpful as well. Mike
01-20-2009, 07:05 PM
#59
Burning Brakes
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This guy is something. He even puts little foam goodies on the doors edges so they will not chip if the door hits the wall. I really can't afford to have him remove the alarm from the other car but I really can't afford not to considering what happend. Thanks again guys.
Mike
Mike