2005 B5.5 V6 2.8L Passat Wagon AWD. Automatic Transmission. 130K miles. Not original owner. No service records provided at purchase.
I have novice to intermediate level of automotive repair knowledge. I searched through several threads on this site and others for information related to the crank but, no start issue before I posted here. This is a friend's car and most of my experience is with Japanese cars.
Cranks but, no start issue. Initially (two weeks ago), engine shut off in traffic without warning or CEL light and wouldn't start again. Car towed home. Initially, after towing home and trying to start there is No CEL light and no codes coming up with code reader. The following has been tested/replaced within the past two weeks:
1) No fuel pressure: tested at fuel lines that connect to fuel rail. However, fuel pump engages with ignition on and can hear it audibly. Removed pump, tested with 9v battery and it pumped/flowed well.
Replaced fuel filter and repaired broken vacuum line (very small diameter, very brittle) that connects to the fuel pressure regulator. Now fuel at least getting to beginning of fuel rail: checked by loosening connection between fuel line and fuel rail... gas gushed out.
Engine still not starting.
2) Checked spark with Lisle spark tester https://www.amazon.com/Lisle-20610-Inline-Spark-Tester/dp/B0002STSC6 and held each spark plug electrode against firewall. Very good spark on all six wires and five of the spark plugs. One spark plug was weak but, not enough to cause a no start issue.
3) Did a compression test but not under optimal conditions. Battery was not fully charged and engine cold.
Dry compression test proceedure used for all six cylinders: Removed all six spark plugs, held gas pedal to floor during cranking, cranked long enough to reach a point that compression needle reached a peak and then kept crank a couple more times past to ensure highest reading. Readings were between 120 to 160 psi. Unfortunately, I didn't have any oil on hand to do a wet compression test.
Spark plugs had normal carbon buildup for mileage. They were not wet with fuel, oil or coolant and no abnormal smell. No signs that it was flooded.
4) Replaced ECT (coolant temp sensor) with an aftermarket (4-wire). I generally diagnose before replacing but, the ECT sensor has come up many times as a possibility for the posted issue. It was only $10 and figured it was worth doing while I had the air intake off. Turned out to be a bit of a challenge to replace due to the metal tubing that is inconveniently above it. My friend did the replacement.
5) Replaced some vacuum lines that literally crumbled at the slightest touch. Not sure why a manufacturer would use such tiny diameter, plastic tubing next to a hot engine and not expect or anticipate them to get brittle. Replaced/intergrated small diameter factory lines with rubber vacuum lines that fit snugly over their outside diameter.
6) RPM gauge moves during cranking which, from what I've read, should rule out a faulty ESS (engine speed sensor/crank position sensor).
7) Performed ECU reset/relearn using this procedure: http://www.passatworld.com/forums/v...cussion/157204-diy-engine-computer-reset.html
Does anyone know if there is another procedure. Does this also align the throttle body?
As of yesterday still cranks but no start. Oil pressure light comes on now when cranking: Read that this is normal for crank no start condition.
EPC light is on. Now, no CEL light but has two fault codes:
P0444: P0444 - OBD II Trouble Code
P0104: P0104 - OBD-II Trouble Code
My assumption is these codes are due to cranking the engine with air intake (includes purge valve and MAF) removed. I also assume these codes can be cleared after engine and will most likely not return after engine starts running. My friend plans on cleaning the MAF sensor with MAF spray and spraying TB cleaner in throttle body just before next starting attempt.
Some threads I've read also suggest a faulty ignition switch as a possibilty. A faulty fuel pressure regulator also comes up as a possibilty.
Unfortunately, we don't have access to a VAG VCDS scanner to expidite this process.
All replies appreciated
I have novice to intermediate level of automotive repair knowledge. I searched through several threads on this site and others for information related to the crank but, no start issue before I posted here. This is a friend's car and most of my experience is with Japanese cars.
Cranks but, no start issue. Initially (two weeks ago), engine shut off in traffic without warning or CEL light and wouldn't start again. Car towed home. Initially, after towing home and trying to start there is No CEL light and no codes coming up with code reader. The following has been tested/replaced within the past two weeks:
1) No fuel pressure: tested at fuel lines that connect to fuel rail. However, fuel pump engages with ignition on and can hear it audibly. Removed pump, tested with 9v battery and it pumped/flowed well.
Replaced fuel filter and repaired broken vacuum line (very small diameter, very brittle) that connects to the fuel pressure regulator. Now fuel at least getting to beginning of fuel rail: checked by loosening connection between fuel line and fuel rail... gas gushed out.
Engine still not starting.
2) Checked spark with Lisle spark tester https://www.amazon.com/Lisle-20610-Inline-Spark-Tester/dp/B0002STSC6 and held each spark plug electrode against firewall. Very good spark on all six wires and five of the spark plugs. One spark plug was weak but, not enough to cause a no start issue.
3) Did a compression test but not under optimal conditions. Battery was not fully charged and engine cold.
Dry compression test proceedure used for all six cylinders: Removed all six spark plugs, held gas pedal to floor during cranking, cranked long enough to reach a point that compression needle reached a peak and then kept crank a couple more times past to ensure highest reading. Readings were between 120 to 160 psi. Unfortunately, I didn't have any oil on hand to do a wet compression test.
Spark plugs had normal carbon buildup for mileage. They were not wet with fuel, oil or coolant and no abnormal smell. No signs that it was flooded.
4) Replaced ECT (coolant temp sensor) with an aftermarket (4-wire). I generally diagnose before replacing but, the ECT sensor has come up many times as a possibility for the posted issue. It was only $10 and figured it was worth doing while I had the air intake off. Turned out to be a bit of a challenge to replace due to the metal tubing that is inconveniently above it. My friend did the replacement.
5) Replaced some vacuum lines that literally crumbled at the slightest touch. Not sure why a manufacturer would use such tiny diameter, plastic tubing next to a hot engine and not expect or anticipate them to get brittle. Replaced/intergrated small diameter factory lines with rubber vacuum lines that fit snugly over their outside diameter.
6) RPM gauge moves during cranking which, from what I've read, should rule out a faulty ESS (engine speed sensor/crank position sensor).
7) Performed ECU reset/relearn using this procedure: http://www.passatworld.com/forums/v...cussion/157204-diy-engine-computer-reset.html
Does anyone know if there is another procedure. Does this also align the throttle body?
As of yesterday still cranks but no start. Oil pressure light comes on now when cranking: Read that this is normal for crank no start condition.
EPC light is on. Now, no CEL light but has two fault codes:
P0444: P0444 - OBD II Trouble Code
P0104: P0104 - OBD-II Trouble Code
My assumption is these codes are due to cranking the engine with air intake (includes purge valve and MAF) removed. I also assume these codes can be cleared after engine and will most likely not return after engine starts running. My friend plans on cleaning the MAF sensor with MAF spray and spraying TB cleaner in throttle body just before next starting attempt.
Some threads I've read also suggest a faulty ignition switch as a possibilty. A faulty fuel pressure regulator also comes up as a possibilty.
Unfortunately, we don't have access to a VAG VCDS scanner to expidite this process.
All replies appreciated