Hesitation on WOT (V70 2.0 T5 AWD 1997) Topic is solved

Post by **Fiodor** » 28 Nov 2018, 06:35

Okay, fuel filter replacement didn't change anything

Post by **Fiodor** » 28 Nov 2018, 08:20

This car isn't made to run E85 but I've put on a piggyback device that raises the amount of fuel per injection cycle so that I could have the proper AFR.
And I don't know what ECU is in the car.
I've left it to my mechanic who'll tell me tomorrow if he finds the cause of my issues.
I'll keep you updated, thanks for your help !

Post by **misha** » 28 Nov 2018, 08:48

Maybe that device is the source of your problems.

Post by **Fiodor** » 28 Nov 2018, 09:15

I've tried unplugging it, didn't change a thing :'(

Post by **Fiodor** » 29 Nov 2018, 05:17

Update!
If I run with the MAF unplugged my problems disappear + my fuel consumption drops drastically!
does this make the MAF the definitive culprit?

Post by **misha** » 29 Nov 2018, 05:21

Usually...bad Maf have totally different symptoms.
Is Maf that is currently on the car Bosch or something aftermarket?

Post by **Fiodor** » 29 Nov 2018, 05:22

Will check this evening and report.
Thanks for bearing with me

Post by **misha** » 29 Nov 2018, 05:25

If it is not Bosch...it can cause unusual behaviour....pretending that it's working...but not properly...since aftermarket Maf doesn't have the same values as Bosch(OE) one.

Post by **abscate** » 29 Nov 2018, 06:47

Fiodor wrote: 29 Nov 2018, 05:17 Update!
If I run with the MAF unplugged my problems disappear + my fuel consumption drops drastically!
does this make the MAF the definitive culprit?

It might be the MAF or it could be an induction leak after the MAF. When you unplug the MAF, the ECU guesses the air flow by rpm, and it gets pretty close. It will run a bit rich, but it will run well.

Post by **Fiodor** » 29 Nov 2018, 13:12

It's a Bosch MAF, the ECU is a moronic 4.4

It feels as if unplugging the MAF causes a performance loss.
The car doesn't stutter but it also doesn't pull as hard...