Help wanted please

[VincentRS2]

Help Wanted,.

Hello audi fans!, yesterday i made an pull with the car, in 3th gear, till 7500 aprox.. Afterthat the car runs very strange, i looked at the log file from Vems and noticed that something was maybe broken or else... Before the car runs very fine... starts good, cold and warm, drives very good.. Maybe one of you can see whats wrong or defect.. I saw that the pulse width sometimes is zero.. and lambda is jumping around..



Regards Vincent

Setup:
Audi S2 3b
TTE380 turbo
470 cc Bosch
n75
coils NGK R06 02 S 003 00 (U5014 395N) red ones

[newsh]

The first thing I would do is a boost leak check.

[pfi]

check the MAF connector, known issue

[VincentRS2]

check the MAF connector, known issue

Thanks! It was the first time in all times that i drive so many rpm's,.... could the MAF connector suddenly be defect...?.

[pfi]

Kind of, corrotion on the contacts, happened to me, behavior like You described, pulled it off/on a couple of times and all ok for now

[VincentRS2]

Kind of, corrotion on the contacts, happened to me, behavior like You described, pulled it off/on a couple of times and all ok for now

I try that also .. let you guys know about that

[pfi]

Could of course be a leak somewhere but the MAF is easy to check before doin' a boost leak test ...
( My experience is from a std 93' ABY )

[VincentRS2]

Thanks! It was the first time in all times that i drive so many rpm's,.... could the MAF connector suddenly be defect...?.

I saw i have no MAf sensor

[pfi]

I saw i have no MAf sensor

At least eliminated a possible source of error then ...

[VincentRS2]

At least eliminated a possible source of error then ...

I looked again at the log file,.. i noticed that the spark angle most at the time at 7 degrees was... but in the settings is that 12 degrees.... , then after 5 minutes its goes up in rpm , and from 15 to 24 degrees... spark... Could it be i blew the coils? after that rough pull in 3th gear?

[Rikki Kitto]

No MAF, what is this Voodoo

[pfi]

No MAF, what is this Voodoo

nope, several "aftermarket" supports MAF "deletion"

[Rikki Kitto]

Makes sense when new ones are £500 if you can find one

[pfi]

Yup, really expensive as a new one
but, You might be lucky to find a used one for a fraction of the cost
lucky be me, got two spares

[Rikki Kitto]

Problem is as they age they become less accurate