Audi 100 Turbo C3 , not willing to start warm

[jaka]

Hi!
My brother has an Audi 100 Turbo from 1991 (C3 model) and sometimes it it impossible to start the engine when warm, especially if it's +20-30 degrees celsius . We have changed the fuel pump, replaced the lambda sond, spark plugs, distributor, rotor , It will always start when cold and most of the time when warm but occasionally will not start having sat warm for 20-30minutes after being run warm.

[barny]

Hello Jaka,

check the injectors, these must not drop. Warm start issues indicates that mostly.

[sigare]

yup vaporlock and leaking injecter,
http://www.sjmautotechnik.com/trouble_s ... ouble.html
http://www.sjmautotechnik.com/trouble_s ... start.html
http://www.sjmautotechnik.com/trouble_s ... ficis.html

[jaka]

Hi!
The strange thing with my brothers Audi 100 Avant Turbo- 91 is that when this happens (that the engine doesn't start when he turns the starter key)...he is able to start it by running the car in 2 gear,on the battery and then the engine starts every time...first slowly on just two or three cylinders and after a few seconds on all five.

[sigare]

Hi!
The strange thing with my brothers Audi 100 Avant Turbo- 91 is that when this happens (that the engine doesn't start when he turns the starter key)...he is able to start it by running the car in 2 gear,on the battery and then the engine starts every time...first slowly on just two or three cylinders and after a few seconds on all five.

still leaking inj will corse this problem.
its a full elk ign, so ther is not the problem...

[jaka]

Hi!
Problem solved!
Changed to five new Bosch injectors and since then the car starts warm without problems

[jaka]

Hello!
Aaah!
Last Saturday the same problem occurred again! The car did not start! After having driven the car and making a few stops at different shops the car did not start! But after a while having nearly emptied the battery we tried towing it and it started instantly!
Problem might be a faulty ignition switch. But after coming home the car started instantly as usual.
I'm going to replace the ignition switch and see what happens.

[Jens 220V-Abt-Avant]

Morning!

i think, your problem is the hall-sensor in the distributer.
just try cooling down (bottle of water) the distributer when it is not possible to start the warm engine, if it starts afterwards you´ve found the fault.

[sigare]

Morning!

i think, your problem is the hall-sensor in the distributer.
just try cooling down (bottle of water) the distributer when it is not possible to start the warm engine, if it starts afterwards you´ve found the fault.

comprest air in a spraytin is easy, drive when is happening spray the air and you know

[jaka]

Hi!
I replaced the ignition switch two weeks ago and since then the car has started fine!
I replaced the Hall censor with a new one several years ago, so that wasn't the culprit.
I let you know how things evolve...

[jaka]

Hi!
Car starts fine now after I changed the ignition switch. I hope it remains so!