New to Supra's (And Turbo's), problems (Bov related.)

[Chinois]

Hello everyone!
Well first I would like to start off by I recently purchased a 1989 Supra Turbo. Now the motor and tranny has been completely rebuilt and a metal hg has been placed as a cherry on the top.

To me, this is a perfect project.

I just recently purchased a HKS SSQ BOV. Now, the car was running perfect for 2 days after installation but I noticed last night when I got off the highway the car felt like it was sluggish, reving lower then usual and struggling to get to higher RPMS, when it does past 2.5-3 its fine.

I heard a lot of problems with the BOV, I have it placed into the intercooler piping, so its non recirculating.

My question is: Is there a way I can mount the HKS SSQ and my stock recirculating bov? Do I need the small vacuum line to be split into the SSQ and into the recirculating or just the HKS?

Thanks for your replies, I hope you guys can help me make this purchase a not so costly one.

 

[Chinois]

Cmon I'm working on it now, I'm cuttinggg lol

 

[IwantMKIII]

First....don't rush, your question is no more important then someone elses

Second....there's a search button on this forum and its very useful. Get used to using it

3rd.....DO NOT use your stock BPV

4th....its probably a boost leak.

5th....w/o a tuning device, its best to recirrculate a BOV or you WILL stall

EDIT: BTW, welcome. You will find this site very helpful if you ask the right questions and provide the right info

 

[A-to-the-J]

5th....w/o a tuning device, its best to recirrculate a BOV or you WILL stall

I'm actually having no stalling problems with my HKS SQV vented. a couple of my buddies as well have no problems. IMHO, the opinion of the SQV causing people to stall is a myth. just don't put it straight to neutral after letting off the throttle i guess would help? not too sure, but as stated, a few of my friends and i don't have problems with the HKS SQV.

OP: could be a boost leak. check all the piping/couplers, especially the one from the TB to the 3000 Pipe. definately take a GOOD look at the lower intercooler piping (Turbo > IC). that's where mine was.

 

[89TargaT]

I have no problems with my SSQV being vented and stalling. To the OP, are you hitting fuel cut at all when having this problem? Check for boost leaks especially on the lower intercooler pipe.

 

[Chinois]

No I am not and I put my stock BOV along with my HKS and its working superb, I think I may have fried a few spark plugs thought cause I'm now only running on 4 instead of 6, but BOV = not a problem anymore, was a shock to my ECU I guess.

 

[IwantMKIII]

I'm actually having no stalling problems with my HKS SQV vented. a couple of my buddies as well have no problems. IMHO, the opinion of the SQV causing people to stall is a myth. just don't put it straight to neutral after letting off the throttle i guess would help? not too sure, but as stated, a few of my friends and i don't have problems with the HKS SQV.

OP: could be a boost leak. check all the piping/couplers, especially the one from the TB to the 3000 Pipe. definately take a GOOD look at the lower intercooler piping (Turbo > IC). that's where mine was.

I have no problems with my SSQV being vented and stalling. To the OP, are you hitting fuel cut at all when having this problem? Check for boost leaks especially on the lower intercooler pipe.

it may not be a big problem, but it will happen. Give it some gas and completely let off....odds are, it will stall..i know

if not, you're lucky. Normal everyday driving conditions stalling isn't an issue, its those times you can't have it stall it will, ie traffic on an incline, you rev up, person in front of you stops quick you stall majority of time.

 

[Chinois]

Thanks for the help boys, pulled out all my plugs, 2 of them are wet.. Maybe the coil pack? No boost leak known til now

 

[Chinois]

Blown headgasket? Theres no way this could of caused it, some kids had worked on the vehicle and put a metal hg on it, it might of not been done right.. this is going to be costy..

 

[suprahabsfan]

Faulty BOV, Improperly seated BOV, BOOOOOST LEAK! Check to see if black smoke is coming out the exhaust when boosting.... = running very rich. Also, any engine codes?

 

[Chinois]

Well I checked my compression, I got 160 on the first, 40 on 2 of them. Pretty sure its the headgasket bro, I'm just curious to know if the BOV would of done it but I seriously doubt it.

 

[suprahabsfan]

check your torque on the HG. No, Installing a BOV wont cause a BHG, but I dont like the sound of "some kids worked on the vehicle". Are you overheating?

 

[suprahabsfan]

Well I checked my compression, I got 160 on the first, 40 on 2 of them. Pretty sure its the headgasket bro, I'm just curious to know if the BOV would of done it but I seriously doubt it.

40!??!!! :aigo: If your not overheating, and its not a BHG, you have basically no piston rings! At 40 compression on 2 cylinders you should be be SMOKING if its a BHG. Either way....time for a rebuild!!!

 

[Chinois]

40!??!!! :aigo: If your not overheating, and its not a BHG, you have basically no piston rings! At 40 compression on 2 cylinders you should be be SMOKING if its a BHG. Either way....time for a rebuild!!!

Figured, Im not overheating but I'm still crying :'(

Oh well.. Time to built it :naughty:

 

[CTsupra]

He bought this bov kit from me. There is no way I would sell anybody on this forum a faulty anything.

Chinois, so the car was running fine after what I told you to do? Sorry to hear about the BHG

 

[Rennat]

doesnt sound like a BHG... sounds like your rings are shot.

 

[Chinois]

To CT - I reset the ECU but still to no avail, the problem happened I guess when I came off the highway without the BOV being recirculated. Screwed up with my A/F and screwed something else along the way.

Rennat - Thats a distinct possibility, pulling the motor probably this weekend and opening it up, we'll see what's giving me a hard time.

I'll take some pics and such

 

[IwantMKIII]

bad rings aren't a sign of bad a/f......melted pistons are though. On a more stock motor though this isn't an issue, so i'm stickin with rennat on this and just saying VERY worn rings

 

[CTsupra]

That sucks man. Like I said, some supras' you can run without recirc, and others you can not. Hit, or miss. Mine ran perfect with it vented, but I eventually recirculated it. Looking forward to the build thread though!

 

[Keros]

40psi?

OIE!

I have to agree, that sounds like no piston ring... or a hole in the piston. Did you leakdown test those two cylinders yet to try to nail the problem down?

A couple of things could cause a compression drop like that, a leakdown test would help you pin it down without doing open heart surgery.