[s-cars] Help: Possible causes for engine dying? (Could Seafom cause this?)

[James Murray]

Didn't need to go to the dealer, I replaced mine with regular 15 Amp blade fuses. However there are other alternatives:

Slow Blow Blade Fuses: http://www.littelfuse.com/products/Fuses/Blade+Type/FK3/169.6885.5152.html

Or replacement Thermal Breakers at ECS: 

http://www.ecstuning.com/Search/443937105B/

Regular blade fuses are working fine for me right now. 

Cheers, /Jamu. 

-----Original Message-----
From: Jerry Scott [mailto:jerryscott at wispertel.net] 
Sent: July-24-11 8:14 PM
To: James Murray
Cc: 's-car list'
Subject: RE: [s-cars] Help: Possible causes for engine dying? (Could Seafom cause this?)

Were you able to find the S64 and S72 Thermal breakers at the dealer.
Jerry

-----Original Message-----
From: s-car-list-bounces at audifans.com
[mailto:s-car-list-bounces at audifans.com] On Behalf Of James Murray
Sent: Saturday, July 23, 2011 7:27 AM
To: s-car-list at audifans.com
Subject: Re: [s-cars] Help: Possible causes for engine dying? (Could Seafom cause this?)

 
Problem solved! Wanted to update you all in case this helps someone else along the way... 

I initially thought the problem was the S64 Ignition (coil power) Thermal Breaker, since I took it out, openend it up and saw a small spot on the contacts, well this was nothing compared to what I later found on the S72. 

I had initially replaced the S64, but it did not solve the problem, when I started to diagnose the symptoms further I decided to take a look at the S72 which sits two slots over from the S64. Well the carbon build up or what ever was on the contacts did not look good! I replaced it with a 15 Amp fuse and no more problems! running stronger than ever!!! 

I've updated my Picasa folder with S64 Thermal Breaker and two shots of the
S72 inards at the end so you can see the state of the contacts. 

https://picasaweb.google.com/jamujamu/AudiUrSS64IgnitionBreakerS72FuelInject
orBreaker?authuser=0&feat=directlink

Some further technical info that helped me in troubleshooting

From: http://www.sjmautotechnik.com/trouble_shooting/ecuf20v.html#fcs4

1992-93 S4: The Bentley shows S72 (15 Amp Thermal Breaker) with BL (blue) and BK/R (Black with red stripe) wires for supplying +12V to the Fuel Injectors. (1995 S6 shows the use of S116 breaker with the same wiring
colors) It appears that the same wiring colors were used on the later S6 vehicles, but double check the wiring diagram for your specific year. 

If the S72 thermal breaker was failing, then this would explain why my engine was dying and why I could have full fuel pressure but no start condition. It's the exact same type of thermal breaker as the S64, which would cause similar results (engine dying - no start).
 
The injectors are energized by the J17 Fuel Pump Relay (via a 15 amp fuse
(S72) and controlled as to timing of the injector opening and duration of that opening by the ECU, as shown here:

http://12v.org/urs/engine%20map/20441.phtml

Good explination of the C4 UrS Fuel Injector Wiring with Updates:
http://forums.quattroworld.com/s4s6/msgs/90802.phtml

Thank you! 
 
Cheers, /Jamu

-----Original Message-----
From: s-car-list-bounces at audifans.com
[mailto:s-car-list-bounces at audifans.com] On Behalf Of James Murray
Sent: July-18-11 9:00 AM
To: s-car-list at audifans.com
Subject: [s-cars] Help: Possible causes for engine dying? (Could Seafom cause this?)

Patient: 93 UrS4
Conditions: Car dies shortly after running for a few minutes. Car restarts fine, but won't keep running more than a few minutes!

Driving back from the store on Saturday the car just died on the road...
waited 15 min and she started again, and then died again right after. After
1 hr car started and I made it home (not far). Today I can't make it down the street.

Only change I can think of was that I put a can of Seafoam in the gas tank a few days ago with only 30 litres (6.6 gallons) of gas. Could the Seafoam be causing this problem?

Diagonstic Notes: I have good fuel pressure, no missfires.

All I can think of is the Seafom was put in without enough gas? or bad gas... but the car doesn't run ruff or anything when it's running. I don't get it...

/Jamu
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