rpm struggles to reach 5000 and over PLease Help.

[Spidey]

Hey,Heres my problem when I start off from a dead stop my first and second gear rev up to 5K and up perfectly fine.But as soon as I shift into third my car reached 4K and starts to bounce, suge, struggle to go higher I shift and 4th gear is just as bad.I need advice what could be causing this?Please Help.

[ItzGenX]

Check your timing, ground connections, fuel pump, injectors, and mafs.

[Spidey]

how do I check the Mafs? could does be the only sorces of my problem?this was hapenning to me when I ran with no catback. When I bolted my stock catback back on it felt fine it still struggeled a little but not as much.I always though running open header was better?

[ItzGenX]

It can be many more problems. What I mean by checking the MAFS is to have it cleaned, then check if there is varying voltage while the engine is running with a multimeter.

[achilles0t]

hey whether you have ever had the transmission out or not check all the connectors and sensors, there are a few 2 wire sensors, and if you set the trans on the floor two prongs will bend and touch and not allow you to go much over 5200. let me know if it worked Stefan

[slw240sx]

FUEL CUT aka boost cut.. do you have a boost gauge on the car yet?!?! if so what are you boosting to! also are you running a FMIC wth a recir valve as your BOV ! this could all be causnig fuel cut .. more info on your set up would help get the question answered !

[Spidey]

Yes I have an FMIC and BOV and I am boosting at 6psi is it possible I am running to rich or too lean?Im getting a atioch meter installed today I know it taps in to your O2 sensor but to which wire there are three.Also when I run open downpipe I can feel that struggle even more.

[slw240sx]

so is that a yes to the boost gauge!? just cause stock boost is 6or7 doesnt mean thats what your at.. mine was at 10 and i didnt have a controler. also is your BOV atmospheric or recirculating ? that makes a differanve ! if its a recirculating one and its not adjusted it could be leaking air back into the intak and that could cause un metered air into the system also can create turbulence by the MAF and itll cause all kinds of problemns .. i had this on my CA

[Spidey]

Sorry didn't mention I had a boost gauge and it read 6-7 psi and I have an atmospheric BOV.hope that helps

[slw240sx]

no not really cause now i dont have much of a clue of what it could be !! sorry one day ill be a real mechanic and own a SR LOL oh check you maf might need cleaning !!!! o2 sensor and knock sensor !! you might be going to a richer fuel map and it might be boggin down as a result.. i think Srs have that type of fail safe fuel map ? dont know much about them

[Spidey]

I cleaned the mafs and the fuel system and fortunately for me the problem went away Just wanted to say thanks for your help it is greatly appreciated.

Im still gonna install the Air/Fuel gauge just in case.

[Projex240]

I think if it was the maf, then it wouls do it more consistantly. Not just at 4000k rpms. and struggling to get to 5k rpms sounds more like a choking problem, maybe the turbo needs to be rebuilt or replaced. Blown turbos lose alot of top-end efficiency but may still run ok when in the lower rpms.

[titotonto]

Sounds like your bov or recirc valve is leaking. Make sure you. Even if the gauge is reading good boost, the turb may still be having a hell of a time getting to full boost because of this leak. Anyway, I would pressure test the whole system, but your symptoms sound like the valve is leaking.