has this happened to anyone before? *fixed!!*
i know most of the threads about "my car isnt running right, heres what its doing" never get answered because you really need to be there in person to figure it out. But i figured i'd throw it on the table as well. All of this started happening when i swapped to a y8 intake manifold. The car is really jerkey and violent when you get on and off the throttle. It will not hold a cruise speed, you have to accellerate. Other than that, it runs perfectly fine? Here are some things that it is not:
tps sensor- already checked .45 closed and 4.75 open throttle cable free play- I have a homemade mount, but it looks ok to me the evap purge solonoid broke during the swap. I know it does something with vacuum in the canister, but i dont think it would cause this....? |
Re: has this happened to anyone before?
Originally Posted by sohcpwr
i know most of the threads about "my car isnt running right, heres what its doing" never get answered because you really need to be there in person to figure it out. But i figured i'd throw it on the table as well. All of this started happening when i swapped to a y8 intake manifold. The car is really jerkey and violent when you get on and off the throttle. It will not hold a cruise speed, you have to accellerate. Other than that, it runs perfectly fine? Here are some things that it is not:
tps sensor- already checked .45 closed and 4.75 open throttle cable free play- I have a homemade mount, but it looks ok to me the evap purge solonoid broke during the swap. I know it does something with vacuum in the canister, but i dont think it would cause this....? in otherwords, i dont know...just throwing out something. there isnt too much that can go wrong with a manifold swap...vacuum leaks, fuel issues, throttle cable issues, and sensor issues...but looks like youve already got a good start on checking ----.... |
Re: has this happened to anyone before?
its a b18b throttle body. iat is hanging, but im 99% sure that doesnt matter. the evap purge was connected to my cansiter, not the tb. Still got me stumped.
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Re: has this happened to anyone before?
Originally Posted by sohcpwr
its a b18b throttle body. iat is hanging, but im 99% sure that doesnt matter. the evap purge was connected to my cansiter, not the tb. Still got me stumped.
the purge should be connected from intake manifold to purge solenoid to canister...a large line comes from the canister to the TB vacuum....i believe. |
Re: has this happened to anyone before?
no, i swapped the tb with the manifold. I have a moto 2.5 bar sensor though, so the stock one isnt even used.
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Re: has this happened to anyone before?
what ecu are you using??? stock, chipped, or what???
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Re: has this happened to anyone before?
im gonna bet chipped since he is using a 2.5 bar
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Re: has this happened to anyone before?
Originally Posted by ghettoturbo
im gonna bet chipped since he is using a 2.5 bar
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Re: has this happened to anyone before?
sounds like a vac leak
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Re: has this happened to anyone before?
Originally Posted by Zeniceguycrx
sounds like a vac leak
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Re: has this happened to anyone before?
slight mod.
take some quick start spray it around your intake manifold and then around your TB, if your rpm raises then you found the leak |
Re: has this happened to anyone before?
vacuum leak is usually associated w/ surging idle, and sometimes stalling. i wouldnt guess vacuum leak, but a quick check never hurts.
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Re: has this happened to anyone before?
If it was stock, the two common things that cause premature injector cut-off is TPS, and an unplugged/fucked IACV.
On a non-stock MAP sensor car, (assuming the previous 2 are known good) it comes down to the rom editor that you are using. Ive worked on 3-4 2.5bar cars so far running CROME, and the decel injector cut-off was very very smooth. The latest versions of CROME are pretty freaking good in this area; 2.5bar, and GM 2&3 bar. You using Uber or CROME? If CROME, what version? Post your bin if you want, Im bored. Dave Also, is this intermittent or 100% repeatable everytime you drive the car? Ive noticed that a loose dizzy wire (CYP, TDC, or CPK) seemed to cause this condition until you reset the ECU. Also, a loosely/shitty socketed chip can cause intermittent premature cutoff. (Ive noticed this first hand on my own car. Once I changed to a machine hole socket from a dual-wipe type socket, the problem did not occur again.) |
Re: has this happened to anyone before?
good info, storing that in the memory bank.
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Re: has this happened to anyone before?
i love how this thread was dead for a week, and now all this useful info pops up???
Originally Posted by z1guy
good eye, i totally missed that part. did you also change the maps when you swapped the manifold??? alot of times the TPS can be perfect, much like yours and the injectors wont shut off on decel like they should, mista bones just had this problem w/ a gude TB.
Originally Posted by sikcrx89
what it sounds like to me also did you make sure when you did it you scraped the head thouroghly to get the old gasket surface off if you did get some carb cleaner and spray all vaccum sources
Originally Posted by Zeniceguycrx
slight mod.
take some quick start spray it around your intake manifold and then around your TB, if your rpm raises then you found the leak leed- my iacv just started making some crazy noise yesterday. I believe it be fucked as of now. when i turn to key on, it makes this rrrrrweeeeee sound. Its kinda hard to type but kinda sounds like a fuel pump thats going bad. im using crome 1.1.8, i kept ------- with the bin because it wont even start now. I'll have to see if i can find the origional. |
Re: has this happened to anyone before?
how do i attach my bin anyway?
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Re: has this happened to anyone before?
ZIP it and attach a ZIP file...I dont think the forum allows .BIN attachments
As far as your vacuum, 10-13 is VERY low...you could have a map sensor issue. Go back to your BIN before you swapped intake manifolds...see if it does it on that BIN still when it didnt do it before. If it still does this wacky thing...then its mechanical and happened somewhere in the swap. If it DOESNT happen...chances are its something in the BIN file or tune... |
Re: has this happened to anyone before? *fixed!!*
so it actually stopped starting a few days ago too. Turns out the two problems were unrelated. I switched the fuel pump with a walboro 255 because i didnt hear it priming anymore. still didnt work.. i put a chip backwards in my ecu but didnt start the car. I figured my ecu might be beat. Swapped with a known good one. Still no priming action. So i check the service manual, and i dont know why i didnt think of it sooner.. main fuel pump relay. i heard they go bad all the time on eg's.
as for the bucking... the supra 440's fit fine in the z6 intake manifold because of how the injector bosses are made. The thinner shallower or whatever the ---- they are on the y8 dont like them. They actually dont even fit with my new str fuel rail. My assumption was that the injectors were either spraying at the intake or the head under low throttle, thus causing the engine to get a healthy dose when you step on it more. RC550's are on the way and i should have a fuel system good to 400+ |
Re: has this happened to anyone before?
^^^ ;)
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Re: has this happened to anyone before? *fixed!!*
good deal, thanks for updating.
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