car bogs down under moderate throttle and early onset of boost

[ND4MSP]

So it started yesterday, Just after boost starts to climb i get some serious bogging. It happens at part throttle and heavy throttle. Just as the car hits about 1-2 psi of boost after there is some load I get the tugging like all in the sudden Im towing something I shouldn't be. Also if I give it a little extra throttle from a stop. Boost and rpm will climb like a sloth. Sorry for all of the adjectives, just trying to paint the clearest picture possible. So it seems to be triggered by how much load is on the engine. Prob wont get to checking plugs and such until tomorrow.

I know what a tired clutch and boost cut feels like, this is def not that. No cel's but Ill check later to see if there is something soft stored.

Only thing I can add I had a cel a while back for one of the flappers in the intake manny maybe a year or so ago. It ran super rough almost worse that time. I cant remember but it went away after clearning the cel and playing with the solenoid/plungers and seafoaming.

My speed has 134k on it now. Anyone had these symptoms? thx

 

[Wheredjaredgo]

I kinda had some symptoms like that when my car was heated to normal operating temp... My car ran great in the morning when temp showed cool... Till I got to operating temp then it ran like I had a boat connected to my trunk.... What I did is replaced a vac solenoid on top the intake manifold that had a broken nipple on it and then I got an ich to take the intake manifold off and took out the butterfly valves "vtcs" completely freed me from that towing feeling. When I fixed the vac solenoid I also fixed the vacuum leak I had...not sure if replacing that would have gotten rid of that towing feeling but before I fixed it I got a check engine light every now and then it came up as a vtcs problem an when I was driving I could here what sounded like those butterfly valves bound up stuck partially closed I think ... They were rattling bad anytime I got to boost... The car is running great since I made those two adjustments much quicker and better acceleration There's a couple post about those butterfly valve removal procedures Good luck

 

[IshSonP5]

check your MAF (is it relocated?) check for any leaks, and check your plugs and coil packs. I had the same symptoms not too long ago, one coil wasn't working properly only firing every now and then, my intake inlet coupler on my turbo housing was cracked and my MAF was going bad. Replaced it all and now I'm back to normal.

 

[Dr0]

ish was your car missfiring? i have symptoms like ND4MSP, my car idles fine at 22 inhg, 8 psi at 3/4 throttle and holds fine. But basically the car is low on power and soon as the turbo spools up around 1-2 psi the car has a major hesitation/wall and doesnt not pull at all compared to what it was at

 

[ND4MSP]

Check that I do have a cel now lol. And I think my eBay Bluetooth scanner shat itself. Im thinking it's vtcs considering I've had a cel for it in the past. Im just dreading pulling the manifold out, but it would be one less thing that id worry about down the road if I deleted it's guts. Maf is not relocated by the way. Thx everyone

 

[Wheredjaredgo]

Manifold isn't really a big chore I did the complete vtcs removal and replaced the rear motor mount while I was at it because it was easily accessible with the intake manifold off... The whole job took me about 4 hours I had no prior experience taking off the manifold prior. Just make sure you have a new gasket for the manifold and some swivel ratchet adapters " they help you get to the bottom bolts on the manifold" if you don't run into any unforeseen problems you'll be really glad you removed vtcs.

 

[ND4MSP]

Sounds good. Def going to swap that rear mm when I get around to this.

 

[Dr0]

I think I'm gunna do the same also, I know there was a how to on the vcts/vics but what kind of epoxy did you use to fill the holes that the butterfly valves run through?

 

[Wheredjaredgo]

Well the best way to fill the main hole on the left side of the mani that the vtcs runs through is to use a tap and die and then find a bolt that will work with the thread size you just made... But if you don't have a tap and die set you can find a bolt that isn't too long and fits in that vtcs hole... Just buy some quick steel and put some on the bolt threads and push the bolt in the hole and put some more quick steel over the top of the bolt head and you should be fine... But it may not be as secure as the whole tap and die procedure. it's just your preference. And all the other holes just fill with quick steel and try to keep it as flat as possible when filling so you have least resistance... Some people have bored out the manifold while it was out but I did not think it was worth all the trouble for mediocre gains.... If you do use quicksteel just mix up small portions at a time because you will only have 2 mins to use it before it hardens and you waste it. I mixed up about 4 separate applications"from the same tube of quicksteel" it only took 1 tube for my whole manifold and it all seems to be holding well after 4 months of daily driving.

 

[Dr0]

Oh nice. And I'm curious were you having issues before you decided to remove the butterflies? Or were you just looking for a performance DIY mod?

I just want to find the root of the problem so I'm 100% sure this will be worth digging into.

 

[IshSonP5]

ish was your car missfiring? i have symptoms like ND4MSP, my car idles fine at 22 inhg, 8 psi at 3/4 throttle and holds fine. But basically the car is low on power and soon as the turbo spools up around 1-2 psi the car has a major hesitation/wall and doesnt not pull at all compared to what it was at

I was having misfire issues until the coil pack was replaced. However every thing else was due to the MAF. Before replacing the MAF I would hit boost and couldnt get it to go more than 3psi without it feeling like my car was towing something, sputtering, and hitting a wall. Basically no power and a horrible feeling.

 

[Wheredjaredgo]

Mine was a spur of the moment thing to remove the intake manifold I had heard so many good things about the free horsepower and who doesn't want free horsepower if it comes at a safe price and not too much a hassle and that is exactly what this mod was for me. I'm almost 100 percent sure that removing the butterflys fixed my towing feeling but I can't say that just replacing my broken vacuum solenoid would have fixed that towing feeling too because after all with the broken solenoid on my car I could here what sounded like pinging from the butterfly valves being possibly bound up like stuck in a semi closed position at full throttle. When I took the valves out that sound went away completely.

 

[IshSonP5]

See I removed my vtcs a long time ago. So my issue had nothing to do with it.

 

[hornsfan10609]

My car has been acting the same way since tuesday. Won't go into full boost and cuts out under more than half throttle, I think it's hitting fuel cut because of the cold weather, have vtcs deleted on my car.

 

[YlwMSP]

I dont want to thread jack, but it seems pointless to start a new thread for my problem too. It seems to be the same, partial throttle and no power, really falls flat on its face in higher gears, like 3rd-5th.
I have and fmic, reloacated MAF, SSAFC (running stock supermap) 3" tbe, brand new gt25 with less than 200 miles on it. I have all these mods, and it seems to be slower than it was when it was stock. I cant even break the tires loose unless I pop the clutch.

 

[Dr0]

yikes, thats not good... have you tried swapping mafs? how do you plugs look? Think of the easy things.

i think im gunna go to the junkyard in town to get a maf and see what that does. or ill just pick up a brand new maf and test it out... if it doesnt fix it ill just return it haha (did that with so many parts its rediculous that they dont ask any questions!)

Ive been having this problem for a while and i have a 3" TBE and a ssafc v2 that i have been holding off on putting in bc i want to fix the root of the problem before i complicate things with modifications (ssafc mainly)

if i were you i would maybe try uninstalling the ssafc and see how it runs... just my two cents

 

[YlwMSP]

Whats the part number for the plugs and wires everybody is using? I just replaced mine last summer, but I had a vacuum leak and apparently no map loaded up on my SSAFC so it was running pretty damn rich, so probably fouled the plugs or something stupid.

 

[Dr0]

i was driving last night and noticed when the problem occured (most notably in 5th at 50-60mph) the car would almost max out the fuel trims as soon as the car hit2-3psi and the car would hesitate badly and hit a wall.

Im like 99.9% positive this is a MAF issue because my car has NEVER had a missfire in the 6 months ive had it. Plugs are NGK laser iridiums gapped at .28 (NGK v-power Copper plugs work just fine though and their a lot cheaper) and i beleive my plugs and wires are still original

 

[hornsfan10609]

That's how the MSP runs on the stock tune, it runs pig rich (9.8 AFRs sometimes) and hesitates under boost.

 

[BrittanyBug1989]

I need help! I am experiencing this same problem! Not only that, but I have done 2 turbo swaps on my car and about to do a third! I am simply repacing turbos with stock GT25. The car hasn't ran right since the day I bought it a few months ago. Turbos keeps going out (I konw this due to the tremendous amount of oil leakage from the turbo..

Please help me! Just to add, I had a CEL when I first bought the car. Something like P2006 (I can't quite remember). It went away without any work on my part. I had thought I may have bad solenoids, or a bad controller (whatever the device is that tells the solenoids when to open and close). Could this cause turbos to break their seals?

Any help is appreciated!! I took it to the dealer for a diagnostic (after a friend's suggestion). I picked up my car to simply be told I 'had a bad turbo'! I said, "Well duh, that's what I told you when I walked in! I need to know what is causing my car to lose power and kill turbos!" Needless to say, anything will help me at this point!