Well, once more I am posting on here seeking assistance for my poor Cabriolet.
Here is the link to my original post: http://forums.vwvortex.com/showthrea...ks-but-no-fire
This is a 1993 VW Cabriolet with Digi II.
To update, let me explain what is wrong, then what I have done in an attempt to fix the issue.
The problem first started with random no start issues. The car would crank but not start.
After the second time it did this I replaced the cap and rotor (they were in vary bad shape) and the car started right up and ran fine... for a day.
The following morning I go to leave for work and it does it again. Cranks over but doesn't start.
Upon further inspection I noticed the following: A) Fuel Pump was not priming, B ) No spark during cranking (sparks erratically about 3 times when ignition is switched to On position), C) Airbag lights are on and stay on (tho it has been this way since I bought the car 3 years ago).
What I Have Done:
1: New Cap, Rotor, Wires, Plugs, Coil.
2: Replaced ALL grounds.
3: Replaced Ignition Switch.
4: Removed and Checked Primary fuel pump (still good)
5: Replaced Fuel Pump Relay
6: Checked entire Ignition System.
A) Coil is Hot, Ohm's out properly, etc.
B) ICU has battery voltage at connector.
C) Hall Sender tested out (I think)
* Voltage at outer terminals of connector (Very low voltage, book doesn't say how much it should have).
* Switching function questionable (LED Test light stays on and dims while cranking, does not flicker).
D) Just re-read the testing procedures concerning the ICU. Will need to recheck. (Regardless, I don't see how this would effect my fuel pumps)
7: Cylinder compression is Good
8: Fuel Pressure is GOOD (tested by jumping the relay)
9: Injectors are GOOD (nice and clean, Ohm out properly)
10: Checked for any bad grounds under dash, all are clean, wires are not burnt or melted, everything is intact as should be.
So... What in the world could possible effect both my fuel pumps and my spark? A signal is getting lost somewhere.
I read elsewhere on here that the Airbag system can sometimes cause starting issues. I know that many newer, and perhaps older, vehicles with airbags will shut off fuel and spark when the airbags are triggered.
If it isn't this then I suppose I am looking at ECU or ICU issues. :-/
Sorry for the long post, but I wanted to be through for your sake and for mine.
Anyone have an ICU and or ECU for sale?