99 Audi A6 - Mystery no start - HELP!
 

I am going to cry. I have dropped almost $4500 into this car fixing it in the last year... timing belt, tensioner, cam timing sensor, MAF, and i think i have repaced virtually all of the suspension. last month the airbag light came on and the cruise control stopped working... the least of my worries.

This week i replaced the collant temperature sensor and replaced the coolant as it was throwing a code indicating "coolant temperature sensor out of range". basically when we had the car up to opperating temperature and then shut it off, it wouldn't start again for about 20 minutes. sometimes it happens and other times, it starts with no problem?!?!? the car turns over no problem, just does not engage and run. like i said, we wait 20 minutes and it starts fine. just checked the codes again and it's indicating P1136 and P1138... (long term fuel trim add. Fuel bank 1 and 2 respectively . System too lean).

I have checked the air intake system for leaks: no problem
I have relaced the MAF sensor
the only things i haven't checked are the fuel styem (press regulator etc) and Heated O2 sensor and O sensor control.

What is going on??? HELP!
Audi: never ever again. this was a $64K car brand new!?! what a breathtakingly horrible emberasment of a car!

Re: 99 Audi A6 - Mystery no start - HELP!
 

Does you fuel pump work when you have the "no-go" situation?

Re: 99 Audi A6 - Mystery no start - HELP!
 

I am not sure. i have it in to the shop... so i'll let everyone know what the diagnosis is.

Re: 99 Audi A6 - Mystery no start - HELP!
 

Never heard of this happening before. Really shocking. And you say it is a new car?
What about your warranty?

Re: 99 Audi A6 - Mystery no start - HELP!
 

I suppose there could be a fuel intake problem, either the fuel and the air is not able to mix properly,Check fuel mixing system for leaks or blockages .

Re: 99 Audi A6 - Mystery no start - HELP!
 

As long as we're guessing, if your sure there's no boost leak, my vote would be for the front O2 sensor(s). also it wouldn't hurt to change the fuel filter. if its otherwise running fine i doubt the fuel pump is at fault.