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Audi 100 Turbo C3 , not willing to start warm

BeitragVerfasst: 12.01.2019, 23:20
von 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.

Re: Audi 100 Turbo C3 , not willing to start warm

BeitragVerfasst: 13.01.2019, 12:18
von barny
Hello Jaka,

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

Re: Audi 100 Turbo C3 , not willing to start warm

BeitragVerfasst: 13.01.2019, 14:17
von sigare

Re: Audi 100 Turbo C3 , not willing to start warm

BeitragVerfasst: 10.09.2019, 18:46
von 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.

Re: Audi 100 Turbo C3 , not willing to start warm

BeitragVerfasst: 12.09.2019, 13:24
von sigare
jaka hat geschrieben: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...

Re: Audi 100 Turbo C3 , not willing to start warm

BeitragVerfasst: 30.10.2019, 00:00
von jaka
Hi!
Problem solved! :)
Changed to five new Bosch injectors and since then the car starts warm without problems :)

Re: Audi 100 Turbo C3 , not willing to start warm

BeitragVerfasst: 05.12.2019, 22:23
von 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.

Re: Audi 100 Turbo C3 , not willing to start warm

BeitragVerfasst: 07.12.2019, 11:16
von 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.

Re: Audi 100 Turbo C3 , not willing to start warm

BeitragVerfasst: 07.12.2019, 18:27
von sigare
Jens 220V-Abt-Avant hat geschrieben: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

Re: Audi 100 Turbo C3 , not willing to start warm

BeitragVerfasst: 27.12.2019, 11:30
von 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...

Re: Audi 100 Turbo C3 , not willing to start warm

BeitragVerfasst: 01.02.2020, 23:01
von jaka
Hi!
Car starts fine now after I changed the ignition switch. I hope it remains so! :)