Stalling Problem PLEASE HELP!

[AjWit]

I will try and be as exact as possible, bear with me.

My 7m-gte will stall when i push the clutch in to either downshift or come to a stop. Not always, most of the time it is fine and havs no problems. But probably a trip or two a day will i encounter this problem, it will do it for most of the trip, i'll go do something, come back out, start it and then it's fine. Then it will do it again later, you get the idea.

In the higher gears and higher speeds it wont do it, but downshifting from 3rd to 2nd it will occasionally, i'll even try to quickly shift to prevent it but it does it almost as soon as push the clutch around 1.5k to 2k rpms. The coming to a stop one is worse and more annoying though. Whether i wait til the rpm's get low (1k) to push the clutch before a stop or push it higher (2.5k) it'll do it. It starts right back up, but will jump from 300 to 1200 rpm's when i restart it for a few times, then levels out around 700 and i'm good to go. There is no pattern to it, i've already made sure of that. I checked for vacuum leaks, i replaced an aged alternator belt, and put new platinum plugs in and i still have this problem.

The only variable to this problem is i replaced the upper IC piping and put a Turbonetics BOV on, sounds great, i get full 5.5-6 psi and i can't think of any reason why this is happening. Just please don't mention anything about a HG because i'm a bit low on funds right now.

Any help is appreciated, thank you in advance.

 

[jdub]

The BOV is vented to the atmosphere vs recirculated to the accordion hose like stock?
If so, that could be your problem...the motor is going rich and stalling. You might try pulling the EFI fuse in the engine bay box an let the ECU relearn idle, but that's a crap shoot.

Do you have any ECU codes?

 

[87n/a_supra]

ok either one its your TPS, have it checked, or two(and i have slightly this same problem) your BOV is the problem. if it vents into the atmosphere then your AFM will read funny and get confused in a way lol. i would check the TPS first tho

 

[AjWit]

i forgot to mention that i also put in a spectre air filter on the MAF and instead of blocking off the old bov recirculation opening on the accordian pipe, i put a breather on instead, was that stupid of me? i attached a pic of my new engine bay. does this shed any more light?

 

[jdub]

instead of blocking off the old bov recirculation opening on the accordian pipe, i put a breather on instead, was that stupid of me?

Ummmm...yes, it was
You need to block the BOV opening...you are allowing a boat load of unmetered air into the system.

 

[grimreaper]

yes, yes it is! your letting un-metered air in....

edit: jdub beat me to it

 

[87n/a_supra]

well yeah id say so lol, problem solved

 

[AjWit]

I figured it was my stupidity lol. i looked at the picture i took yesterday and was like wait a second... i put a breather after my MAF, that could be a problem but im not 100% sure. Thank you guys for your insight. I'll get on that tomorrow, blocking off that hole. Thanks guys!

 

[AjWit]

I'm sorry to bother you guys again. But my problem is back, not the downshifting one though. Just the stalling at a stop, or more confined to, stalling when there is no load on it. It actually stalled after i started one time today, rpm's went up and a down a couple times and then stall... I start it back up and it's fine, when i say this problem comes and goes, i really mean it. If i make 10 trips(starts) in my car a day, ill usually have 1 stall on start, and 3 trips i'll be plagued with stalls. Embarassing part, an mkII pulls up next to me at a red light, my car is in neutral, and then, stall! I HATE IT, i love the car when it's running well though(most of the time). This may be separate or the same, but i've been noticing that my radiator has been running low on coolant from time to time but i haven't found or noticed a single leak yet. My resovoir is always the same level, but rad will be too low at times and ill add coolant to it, i carry it with me now. Any help would be greatly appreciated. If you need any more info just ask. Thank you.

 

[87n/a_supra]

as for the stalling out part, check your TPS, mine did that to me a while back. and for the coolant part find a coolant system pressure tester and hook it up give it a few pumps and see if you see a leak.

 

[dumbo]

Recirce your BOV and kiss that noise goodbye. That should solve your problem. Why do you think Toyota did it?

 

[RazoE]

I had that problem, you are letting metered air out too quickly. Downshift, brake, and engine brake to about 1,200 rpms if you can, then clutch in. I bought a recirculating tip for my BOV, but I couldn't find a hose to fit it, so I just got used to downshifting and engine braking...

 

[AjWit]

OK, thanks for the tips. I still dont see why a BOV would have an effect on my car after i come to a complete stop, sit for 5 seconds, then stall. Or why it would at start up. I'll get the TPS checked out, alternator bench tested, and vacuum lines checked over, Again.

 

[dumbo]

OK, thanks for the tips. I still dont see why a BOV would have an effect on my car after i come to a complete stop, sit for 5 seconds, then stall. Or why it would at start up. I'll get the TPS checked out, alternator bench tested, and vacuum lines checked over, Again.

Ok I thought it was stalling shortly after the clutch was pushed in, if your siting for 5 seconds then it abruptly stalls, that may be something else. But recirculate your BOV, the stock ecu/afm is not designed for a vented one. PERIOD.

CHECK YOUR CODES.

 

[AjWit]

Ok I thought it was stalling shortly after the clutch was pushed in, if your siting for 5 seconds then it abruptly stalls, that may be something else. But recirculate your BOV, the stock ecu/afm is not designed for a vented one. PERIOD.

CHECK YOUR CODES.

Well you are right, it is shortly after the clutch is pushed, but every so often i get the 5 second ones and the start stall ones. i have no check engine light and never have had one, but ill check anyways i guess. dont know about recirculating, no more money to buy the kit to do that. i got the turbonetics bov as a gift that i cant sell. thats why its on and not sold for better stuff.

 

[dumbo]

Well you are right, it is shortly after the clutch is pushed, but every so often i get the 5 second ones and the start stall ones. i have no check engine light and never have had one, but ill check anyways i guess. dont know about recirculating, no more money to buy the kit to do that. i got the turbonetics bov as a gift that i cant sell. thats why its on and not sold for better stuff.

Go back to stock? You can have codes without the CEL lit.http://cygnusx1.net/supra/Library/TSRM/MK3/manual.aspx?Section=FI&P=23 I would try and figure something out if you can't go back to the stock bypass valve.

Backyard mechanic:naughty::naughty:

 

[AjWit]

thanks for the link. where can i get an SST to use?

 

[dumbo]

thanks for the link. where can i get an SST to use?

go to your kitchen and twist a peice of tinfoil into a strand. it works.
any peice of wire will work, just strip both ends and stick em in,

 

[gotsomegetsome]

I had that problem, you are letting metered air out too quickly. Downshift, brake, and engine brake to about 1,200 rpms if you can, then clutch in. I bought a recirculating tip for my BOV, but I couldn't find a hose to fit it, so I just got used to downshifting and engine braking...

yea keep doing this and say bye bye to your transmission....happened on my celica after only 1000ish miles of me not knowing that engine braking is bad unless you absolutely need it (like going down large hills once in a while)

 

[dumbo]

I had that problem, you are letting metered air out too quickly. Downshift, brake, and engine brake to about 1,200 rpms if you can, then clutch in. I bought a recirculating tip for my BOV, but I couldn't find a hose to fit it, so I just got used to downshifting and engine braking...

You must not be looking very hard...

yea keep doing this and say bye bye to your transmission....happened on my celica after only 1000ish miles of me not knowing that engine braking is bad unless you absolutely need it (like going down large hills once in a while)

Ummm, what happened 1000miles before that??? Lots of people drive like this. Shit its straight out fun.