86 Audi Coupe GT wont start cold
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AudiWorld Super User
Joined: Aug 2011
Posts: 2,369
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From: Washington
86 Audi Coupe GT wont start cold
Its got the 2.3 engine. even though its an 86, somthing special about it has the factory big spoiler, digital dash, FWD 5 speed. I just can not get it to start right away cold. I have tried a New temp sensor for the ecu, resealed the injectors and thier holders, adjusted mixture exactly to spec using the factory tool and multimeter to +-0ma and have the idle screw fully seated.
Still when it sits for 6+ hours, it will fire, stall, fire stall, fire stall, fire, run horrible, grey black smoke, missing, chugging, backfiring through the intake, somtimes stall. Only for maybe, 30 seconds, a good rev up will clear it out.
It used to be way worse before i did these things. It would have to be throttled barley running untill it had 3-4 minutes of running then its perfectly fine.
One thing is, the hose from the idle stabilizer to the intake, has the Air shrouded fuel injector supply hose broken. and sealed off. Would this have any kind of effect on this?
Still when it sits for 6+ hours, it will fire, stall, fire stall, fire stall, fire, run horrible, grey black smoke, missing, chugging, backfiring through the intake, somtimes stall. Only for maybe, 30 seconds, a good rev up will clear it out.
It used to be way worse before i did these things. It would have to be throttled barley running untill it had 3-4 minutes of running then its perfectly fine.
One thing is, the hose from the idle stabilizer to the intake, has the Air shrouded fuel injector supply hose broken. and sealed off. Would this have any kind of effect on this?
AudiWorld Senior Member
Joined: May 2010
Posts: 1,251
Likes: 22
From: Colorado
Have you checked to see if the cold start valve is squirting fuel during start/warmup? You can place it in a clear jar to see if it's working.
What about vacuum leaks in general? I'd do a smoke test, either with a machine or blown from a cheap cigar from the gas station. That's the easiest way to tell if it's leaking anywhere.
-Rog
What about vacuum leaks in general? I'd do a smoke test, either with a machine or blown from a cheap cigar from the gas station. That's the easiest way to tell if it's leaking anywhere.
-Rog
Audiworld Junior Member
Joined: Nov 2011
Posts: 58
Likes: 0
From: Colorado
Roger nailed it for you, the only thing which stops these cars running when cold is the cold start valve, its on top of the air intake manifold on the right hand side when facing the engine ( almost impossible to get started without the cold start valve working) . I take it that you can hear the fuel pump kick in for a few seconds when you turn the key, the fuel pump gets it signal from the coil ( and the connections on the coil are crappy if you do not have the screw on type ( spade connectors don't work correctly).
if the valve is working correctly you can do what the PO did on mine coupe, connect the cold start valve power wire to the starter solenoid, that way when you start the car you will get the extra gas needed to get her to start.......
After working on my Audi I think I have seen about every hotch botch Band-Aid there is to be had...
if the valve is working correctly you can do what the PO did on mine coupe, connect the cold start valve power wire to the starter solenoid, that way when you start the car you will get the extra gas needed to get her to start.......
After working on my Audi I think I have seen about every hotch botch Band-Aid there is to be had...
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