MK5 Golf GTI

All Things Mk5 => Mk5 General Area => Topic started by: Bainsy edition 30 on February 19, 2013, 09:37:48 am

Title: Having lean idle bank 1 problems
Post by: Bainsy edition 30 on February 19, 2013, 09:37:48 am: Hi I'm having lean idle bank 1 issues putting mil on.

Changed.fuel pump cam follower.
Fuel filter.
New O2 sensor.
Smoke tested no leaks.
Getting high fuel trims.could it be down to new neuspeed intake I fitted.
Title: Re: Having lean idle bank 1 problems
Post by: E30Dom on February 19, 2013, 09:45:28 am: Guessing you're stage 1 and just put a CAI filter on... sounds like you HPFP is struggling to meet the extra fueling needed for the extra air...
Title: Re: Having lean idle bank 1 problems
Post by: Bainsy edition 30 on February 19, 2013, 11:49:43 am: I'm stage two mate.with full turbo miltek and neuspeed plus uprated oem diverter valve.had problem after fitting exhaust and intake but before remap.
Title: Re: Having lean idle bank 1 problems
Post by: ROH ECHT on February 19, 2013, 03:03:07 pm: Look for looseness in the new intake clamps first. Then check the mass air flow sensor. Find someone not experiencing the issue that will let you try theirs briefly. That will show whether or not to replace it.
If that's not it it is likely the pcv and maybe even coils.
Title: Re: Having lean idle bank 1 problems
Post by: Bainsy edition 30 on February 19, 2013, 04:28:09 pm: Sorry forgot to say iv blocked pcv.and she's had new coils.im getting 254g/s on maf log does this sound right for stage 2.it tends to put mil up when I park car up hot then start up again when hot it's there.hot start
Title: Re: Having lean idle bank 1 problems
Post by: mines a leon on February 19, 2013, 04:35:38 pm: You on Revo??
Title: Re: Having lean idle bank 1 problems
Post by: Bainsy edition 30 on February 19, 2013, 06:10:37 pm: No mate hyperchips
Title: Re: Having lean idle bank 1 problems
Post by: Bainsy edition 30 on February 19, 2013, 07:12:01 pm: Just took maf plug of and run car around town and long turm fuel trim is staying 9.2 with maf on its 24% and over.does that meen my mafs bad.
Title: Re: Having lean idle bank 1 problems
Post by: bacillus on February 19, 2013, 07:27:45 pm: Quote from: Bainsy edition 30 on February 19, 2013, 07:12:01 pm
Just took maf plug of and run car around town and long turm fuel trim is staying 9.2 with maf on its 24% and over.does that meen my mafs bad.

Could be but better be sure it's not the map itself causing these issues...
Title: Re: Having lean idle bank 1 problems
Post by: Bainsy edition 30 on February 19, 2013, 08:07:55 pm: It was doing this before I had map on car mate
Title: Re: Having lean idle bank 1 problems
Post by: bacillus on February 19, 2013, 10:06:25 pm: Quote from: Bainsy edition 30 on February 19, 2013, 08:07:55 pm
It was doing this before I had map on car mate

I'm just the messenger here but any decent tuner would have sorted your issue before mapping the car.
Title: Re: Having lean idle bank 1 problems
Post by: mines a leon on February 21, 2013, 11:29:57 am: Without a doubt, running lean can be fixed by rescaling the MAF to deal with the adapted air flow!

Get yourself a proper tuner! Not just the cheapest!
Title: Re: Having lean idle bank 1 problems
Post by: rich83 on February 21, 2013, 11:46:24 am: Fuel trim should be +-10% from what i remember