When you vent it causes you to run rich between shifts. Recirculate the BOV and take it for another drive.

It shouldn't bog at WOT with that tube removed. It will surge when you let off the gas because all the metered air isn't getting recirculated.

Bogging may mean you could have some vaccuum leaks or you may need to loosen up some restrictions.

Lunch Box is correct. But if it is only doing it at WOT then it may not be related to the BOV recirculation. More likely boost leak which only starts releasing pressure at higher boost or lack of fuel (as you suggested) causing timing to be pulled. It could be a dirty fuel filter restricting fuel flow.

xlMcMlx DsM said:

im lookin at buying a 1990 Talon FWD turbo and the guy cut the recircualtion hose b/c he liked the sound of the turbo. But it kinda bogs, or seems to be not getting enough fuel at WOT. is that because of the recirculation hose being removed? he just put a new fuel pump in it, so i dont think thats the problem.

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It doesn't bog when it's just at an idle? Thats when it generally will bog. When I took my recirculation tube off and blocked off the return snub on the intake, the car wanted to die.

If he just cut the tube than the motor is pulling in unfiltered and unmetered air, this would make it run real lean.

yeah it ran perfect at idle. no surge what so ever, but when we were takin a drive, it would kinda studder, not like it was going to die, but like it was fuel cut or something. Like something was resisting the car. It only happened every so often during that drive. Hes also got a full stainless steel 3" exhaust from the turbo back. sounds wicked. But i am going to buy this car, so im pretty excited. Its my first turbo DSM.

Also could be a combination of the new fuel pump and bov being vented. If it is a larger fuel pump, you could be running rich from that, and the bov venting is only making things worse. I had issues like that, not a vented bov(i think its stupid) but from running a larger fuel pump on the stock regulator. My .02 good luck

Check your plugs. I had that same problem when I bought my Eclipse. I changed my spark plugs, and it was gone.

Sounds like its a boost leak if its stuttering during wot.

We all know that venting the stock bov is a dumb idea. With my 2G, when I'd go WOT the car would sputter. replaced the plugs and fuel filter and the problem went away

I'd be worried about buying the car from a guy who simply cut the recirc tube. You might find more problems with the car later.

yeah, im gonna change all the fluids, plugs, wires, fuel filter, and air filter. But im gonna get a hard upper ic pipe, and a new lower one b/c they look like crap. and he didnt really cut the recirculation pipe, its plugged with a bottle cap. i got money ready for parts and what not, so im set there. but im gonna bring it in to school and run the Genisis scanner on it. just to make sure.

xlMcMlx DsM said:

and he didnt really cut the recirculation pipe, its plugged with a bottle cap. i got money ready for parts and what not, so im set there. but im gonna bring it in to school and run the Genisis scanner on it. just to make sure.

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that guy sounds like an idiot

Ludachris said:

I'd be worried about buying the car from a guy who simply cut the recirc tube. You might find more problems with the car later.

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I will second that.

Check for boost leaks, reciculate your BOV with a stock hose (some people sell them when they upgrade to a MAFt setup; somebody might just give you one to get rid of it), replace your spark plugs and wires (NGK BPR6ES for plugs), recirculate your BOV, do a boost leak test, and report back.

Check for boost leaks, reciculate your BOV with a stock hose (some people sell them when they upgrade to a MAFt setup; somebody might just give you one to get rid of it), replace your spark plugs and wires (NGK BPR6ES for plugs), recirculate your BOV, do a boost leak test, and report back.

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will do this weekend after i pick it up. Im gonna bring some hose i have at my house just to get me home as a temporary fix, then get the recirculation hose for it. But ill compression test it and all that.


p.s. the motor had a rebuild not too long ago. New headgasket, oil pan gasket, and others. So it should be set for a while(hopefully)

xlMcMlx DsM said:

yeah it ran perfect at idle. no surge what so ever, but when we were takin a drive, it would kinda studder, not like it was going to die, but like it was fuel cut or something. Like something was resisting the car. It only happened every so often during that drive. Hes also got a full stainless steel 3" exhaust from the turbo back. sounds wicked. But i am going to buy this car, so im pretty excited. Its my first turbo DSM.

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I'm betting it's boost creep from the 3" turboback causing either fuel cut and/or knock retard from the excessive boost. Does the car have a boost gauge?

try capping off the recirc tube, see if that fixes the bogging issue. If capping off the recirc tube, and still venting the bov fixes the problem, then there ya go...just make sure to recirc the bov once you figure out the issue...


btw for all who wonder...when i tried to vent my bov, i didn't cap the recirc tube (with the rubber headlight adjustment cap thing) and it only boosted about half of what it normally did and ran like shit under wot...when it was capped it boosted fine, just bogged between shifts...i did it as an experiment.

i bet that there is a nice huge after the MAF from when he cut that tube. That can make the car run like total ass. Just reconnect the tube from the diverter valve to the point after the MAF, like factory. See if it makes a difference.

Does the car have a boost gauge?

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no, but it looks like the lines are already run into the cabin for it. Could just the exhaust be causing that much? how would i go about fixing that? i know the leaky intercooler pipes dont help, and neither does the cut recirculation pipe or disconnected MAS, but will it make that much of an effect? I've never had a turbo car or a turbo DSM before, so i dont know the effects of boost creep, but i know what it is.

ok, so ive been reading up on my boost creep homework and i think thats most of my problem, since theres a full 3" exhaust from the turbo back. Im gonna measure the piping on it when i pick the car up the end of this week. and reconnect the MAS and recirculation pipe, run a boost leak test, put in an aftermarket boost guage, change plugs,wires, fuel filter, and hopefully that should be it for a while. Then i can start modding.

Just picked up the car today! It pulled soooo hard when i was driving it home. But the stuttering problem only happened at WOT(only took it there to see if it would do it) I recirculated the BOV with some extra radiator hose i had, reconnected the MAS, but when i looked at the J-pipe to see where the vacuum line ran, it was tee-d off, but then it just ran straight to the intake pipe?? At that point i went searching for the BCS, i couldnt find it! The guys before me must have removed it when they pulled the motor. Also, theres this weird......thing behind the intake mani. The pic is on the bottom, its like some....thing the vacuum lines are connected to. One goes to the TB, the other one is teed off one of the purge control solenoid valve, and they both go to this thing, and then thats it. ???? its got me stumped, maybe you guys can make something of it, but ill take it out for a drive tomorrow, and see if what I did helped. thanks for all your help so far




on the j-pipe, that vacuum hose goes to the intake, not to the bcs, which isnt there


its got me stumped

I found something like that purge device. Except mine was for my fuel canister. I know one of the plugs route to my intake, not mani, but intake.

Ok, well the other night, i recirculated the BOV, and reconnected the MAS, and when i started it up, it had really bad idle surgeWTF and when i tried to take it around the block and give it gas, the car would really shake like it wanted to die, and i kept trying to give it gas, but it would slowly move foreward, and seem like its hitting fuel cut already. But there is NO BCS on the car, which(i think) is most of the problem. nothing there to limit the boost, so you get fuel cut. I ordered a boost gauge and it will be here tomorrow, so ill hook it up and see what it shows.

well i gapped the plugs to 0.044 in. they are new NGK's, so theres no problem there. But since i figured theyre new, they'd look new. I pulled them out and they were black as night(thats rich, right?) so i started the car again, and it had no idle surge. that is until it got to operating temperature. then it surged pretty good. any idea what's goin on?