my S2 aby. drive strange.???

[s2avantdk]

hey. when i acelerate my car is like having tiny tiny smal cut of, or stop in the aceleration. most betwen 2500-4000 rpm. an som time the engine stop total when the boost is coming over 0,4 bar. then i can take the ignision off an start it again, then is ok, but stil the small cut in the aceleration.
i have a new N75 an new NGK PFR7B,
what the F... can be wrong now.............

[s2avantdk]

today i have driving around in 1 houer, an the car is runing ok, stil these smal "bump" in the aceleration. an then sodently after 60 minut. is begining to cut off when the bost got over 0,4 bar.

[Ian Simmonds]

Not got a duff batch of fuel have you?.. My S2 with MTM remap goes nuts with low octane fuels... (and i suspect some retailers aren't quite as honest as we would like to think when it comes to what comes out of 97/8 octane pumps ) As I say, our's notices lower octanes immediately, with a pinking type sound and power retardation. - All fine at the moment on V-power.

[dkw_dude]

Agree..

Be sure to run the highest octane fuel available. The S2 is sensitive regarding spark plugs, this could very well be the reason for cut off, haven't heard of anyone running NGK PFR7B. Orginal Bosch F5DP0R works well, even with tuned engines.

[s2avantdk]

i drive on 97 V-power from Shell.
i have change the Bosch F5DPOR to the NGK becouse i think it was them ther was the problem.

[s2avantdk]

now i have clean my MAF, and it sems like the car now drive better en ever before. ;-)
but lets se when i have drive a long trip in the wekkend.

[s2avantdk]

undtil now the car has drive very god. so i think the problem have ben the MAF.

[s2avantdk]

today the car is doing the bumping agin, betwen 3000-4000 omdr.
now i will by a new MAF, an hope it will desaper.

[s2dude]

today the car is doing the bumping agin, betwen 3000-4000 omdr.
now i will by a new MAF, an hope it will desaper.

Did you use IPA to clean the Maf??
Search this forum for "maf baf"
Have you dont the MAF voltage tests?? to see if its faulty.....

https://www.s2cet

Have you replaced your WGFV?? (likely cuprit maybe...) = waste gate frequency valve

Its s common fault and when it faults boost is limited to around .4 bar boost

Also...have you pressure tested your system for boost leaks??
if so I would do that ASAP

[s2avantdk]

tehe wgfv ventil is new. i clean the MAF, with brake clean spray,
but i havent check the system for bust leaks, i will do that, an by A new MAF.

[Ski]

Ive had these symptoms and it was MAF / wgfv.

If you say they are new / clean maybe you need to clean the connectors or something?

[UUUdirs2newcastle]

now i have clean my MAF, and it sems like the car now drive better en ever before. ;-)
but lets se when i have drive a long trip in the wekkend.

How did you clean your MAF ?

[Greg_S]

Get yourself some isopropyl alcohol (IPA) and wash over over element in the MAF

[larsaskogstad]

How did you clean your MAF ?

I usually buy a designated MAF cleaner, like CRC Mass Air Flow Sensor Cleaner or similar.
Just spray it through until its clean, it dries up fast and doesn't leave any residue.

Do NOT use stuff like WD40 etc..