Car dies when u touch the gas - TriStateTuners.com :: Home of Tristate Auto Enthusiast

240_fun · 08-20-2009, 08:50 PM

So i just finished installing my T25 and i go to start the car and BAM
starts right up... awesome
I go to rev the car and it dies...
start it again and touch the gas... almost dies but comes back...
The car idles veryyyy smoothly and at 1000 rpm without IACV...
timing is right, TPS sensor is brand new and adjusted right,
I have 15psi of vacuum at idle which is prolly from a broken t bolt clamp but would it really cause that much of a problem?
Could I have a bad MAF?
whats going on???

teh DIRT · 08-20-2009, 09:29 PM

1000 rpm idle? why no IAC?

05OCsrt-4 · 08-20-2009, 10:10 PM

how is your fuel pressure?

240_fun · 08-20-2009, 10:11 PM

i havent really messed with the idle but no iac to make the manifold cleaner and easier to work on... its a track car

240_fun · 08-20-2009, 10:12 PM

Quote:

Originally Posted by 05OCsrt-4

how is your fuel pressure?

34 psi... i have an adjustable FPR
it idles smooth and no black smoke or anything... wideband comes tomorrow to verify my AFR

Renegade_ · 08-21-2009, 12:36 AM

34psi? On an SR? I run 43psi at idle on my sr with T28...

teh DIRT · 08-21-2009, 12:42 AM

you need an IAC (IDLE AIR CONTROL VALVE) to idle. unless you can program it some other way.

TurboTagTeam · 08-21-2009, 12:44 AM

Quote:

Originally Posted by 240_fun

i havent really messed with the idle but no iac to make the manifold cleaner and easier to work on... its a track car

Cant just do away with that.....

The IAC is the Idle Air Control valve. It makes your car........idle

supraghost · 08-21-2009, 07:28 AM

unplug your maf and see if it does the same thing. thats exactly what my car did when the maf went bad

Vr-4-Life · 08-21-2009, 12:17 PM

Nick... your car may still stall out with the MAF disconnected...

I would assume that your hacked up wire harness could be the problem.. Id check the voltage\resistance of the MAF signal wire at the ECU and right after the MAF....

240_fun · 08-21-2009, 01:33 PM

Forgot to tell you my setup

KA24DET T25, 370cc injectors, Stock MAF, FMIC, Completely Bare Intake manifold (NO emissions no IACV no coolant lines, nothing) adjustable FPR set at 36psi at idle

Quote:

Originally Posted by teh DIRT

you need an IAC (IDLE AIR CONTROL VALVE) to idle. unless you can program it some other way.

Quote:

Originally Posted by TurboTagTeam

Cant just do away with that.....
The IAC is the Idle Air Control valve. It makes your car........idle

I opened the throttle about 2%.. i know a few ppl who have done it and the car runs fine

Quote:

Originally Posted by Renegade_

34psi? On an SR? I run 43psi at idle on my sr with T28...

Im sorry 36psi is correct for a stock KA... 43psi is with no vacuum for a stock KA... i figured id start there

Quote:

Originally Posted by supraghost

unplug your maf and see if it does the same thing. thats exactly what my car did when the maf went bad

When i unplugged it nothing happened

Quote:

Originally Posted by Vr-4-Life

Nick... your car may still stall out with the MAF disconnected...

I would assume that your hacked up wire harness could be the problem.. Id check the voltage\resistance of the MAF signal wire at the ECU and right after the MAF....

definate possibility cuz my pigtail is all effed up

240_fun · 08-21-2009, 01:36 PM

Ok so i didnt touch anything (i dont think)
ok so now i have a different problem...
go to start the car... and crank crank crank vroooo---fail...
okkk... so then i step on the gas and start the car.... it revs to 3500 sputters and dies...
tightened all the tbolt clamps cept for the one thats broke.

does this make sense?

Vr-4-Life · 08-21-2009, 02:09 PM

Whats up with your ECU? can you get any diagnostics out of it?

Can you log data from it?

Vince@R/TTuning · 08-21-2009, 02:56 PM

Quote:

Originally Posted by TurboTagTeam

Cant just do away with that.....

The IAC is the Idle Air Control valve. It makes your car........idle

you can get rid of a IAC on a track car, all the iac does is raise and lower the idle under different conditions...

warm the car up set your throttle stop screw at 1500rpms set your tps to .3-.5 volts closed and there ya go...

240_fun · 08-21-2009, 09:24 PM

Quote:

Originally Posted by Vince@R/TTuning

you can get rid of a IAC on a track car, all the iac does is raise and lower the idle under different conditions...

warm the car up set your throttle stop screw at 1500rpms set your tps to .3-.5 volts closed and there ya go...

troof...

240_fun · 08-21-2009, 09:25 PM

Quote:

Originally Posted by Vr-4-Life

Whats up with your ECU? can you get any diagnostics out of it?

Can you log data from it?

Nah its just a stock ECU with a ROM Tune... and im not throwing any codes so idk whats up... come to think of it... ive never thrown any codes... wait.... i think i did once. and it went away in the 3 seconds.

Rockstar · 08-22-2009, 01:24 AM

Quote:

Originally Posted by 240_fun

Ok so i didnt touch anything (i dont think)
ok so now i have a different problem...
go to start the car... and crank crank crank vroooo---fail...
okkk... so then i step on the gas and start the car.... it revs to 3500 sputters and dies...
tightened all the tbolt clamps cept for the one thats broke.

does this make sense?

Is this a inital ka-t setup?..if so go over thing over and over. Pull out plugs see if they're fouled/wet..
If it revs to 3k maf should be okay. maf safe mode is 2500rpm
-15 is pretty low definate vacuum leak and car running rich. If you need any help hit me with a pm.

smelly240 · 08-22-2009, 07:43 AM

sounds like maf - or the ecu needs tuning very badly - did you change to a z or n60 or anything like that?

you can use a consult cable and check its sensors, diagnostics, and codes...

Honduh · 08-22-2009, 09:32 AM

If your coupler is leaking AFTER the maf it could easily cause this problem. If its sucking in air that isn't metered by the MAF its going to make the ecu say "wtf where did all this air come from I wasn't expecting this".

And to all the guys saying you NEED a iac - lolololololololol

240_fun · 08-22-2009, 11:28 AM

Quote:

Originally Posted by smelly240

sounds like maf - or the ecu needs tuning very badly - did you change to a z or n60 or anything like that?

you can use a consult cable and check its sensors, diagnostics, and codes...

I just talked to LJ the other day and he told me to ask you to tune my car lol
The ECU came off a running KAT setup identical to mine so im going to assume the ECU is good but i guess you never know... Its currently tuned for a stock MAF

Im going to run to the junkyard and pull a new MAF and pigtail later and I guess we'll see where we're at after that... I got my new t-bolt clamp from Extreme PSI so hopefully that will have taken care of my leaks

08-20-2009, 08:50 PM	#1
240_fun Tri-State Addict Join Date: Nov 2007 Location: Pennington Member #6320 My Ride: BMW 320i, BMW 315 Euro iTrader: (5)	Car dies when u touch the gas So i just finished installing my T25 and i go to start the car and BAM starts right up... awesome I go to rev the car and it dies... start it again and touch the gas... almost dies but comes back... The car idles veryyyy smoothly and at 1000 rpm without IACV... timing is right, TPS sensor is brand new and adjusted right, I have 15psi of vacuum at idle which is prolly from a broken t bolt clamp but would it really cause that much of a problem? Could I have a bad MAF? whats going on??? __________________ ///M [img]http://24.media.tumblr.com/tumblr_li6tbrhfHg1qavqigo1_500.gif[img]

08-20-2009, 10:11 PM	#4
240_fun Tri-State Addict Join Date: Nov 2007 Location: Pennington Member #6320 My Ride: BMW 320i, BMW 315 Euro iTrader: (5)	i havent really messed with the idle but no iac to make the manifold cleaner and easier to work on... its a track car __________________ ///M [img]http://24.media.tumblr.com/tumblr_li6tbrhfHg1qavqigo1_500.gif[img]

08-21-2009, 12:36 AM	#6
Renegade_ Tri-State Post Whore Join Date: May 2006 Location: NNJ/NYC Member #1912 My Ride: 1J Swaggon iTrader: (2)	34psi? On an SR? I run 43psi at idle on my sr with T28... __________________ To view links or images in signatures your post count must be 10 or greater. You currently have 0 signatures.

08-21-2009, 01:36 PM	#12
240_fun Tri-State Addict Join Date: Nov 2007 Location: Pennington Member #6320 My Ride: BMW 320i, BMW 315 Euro iTrader: (5)	Ok so i didnt touch anything (i dont think) ok so now i have a different problem... go to start the car... and crank crank crank vroooo---fail... okkk... so then i step on the gas and start the car.... it revs to 3500 sputters and dies... tightened all the tbolt clamps cept for the one thats broke. does this make sense? __________________ ///M [img]http://24.media.tumblr.com/tumblr_li6tbrhfHg1qavqigo1_500.gif[img]

08-22-2009, 07:43 AM	#18
smelly240 Tri-State Addict Join Date: Jun 2006 Location: near the big fancy mall Member #2072 My Ride: 1990 Nissan 240 iTrader: (1)	sounds like maf - or the ecu needs tuning very badly - did you change to a z or n60 or anything like that? you can use a consult cable and check its sensors, diagnostics, and codes... __________________ PSIPROformance.com Last edited by smelly240; 08-22-2009 at 07:46 AM.

08-21-2009, 12:17 PM	#10
Vr-4-Life Tri-State Post Whore Join Date: May 2006 Location: Philly PA Member #1961 My Ride: BMW E60 M5 V10 6 Speed --- Ducati Monster 696 iTrader: (4)	Nick... your car may still stall out with the MAF disconnected... I would assume that your hacked up wire harness could be the problem.. Id check the voltage\resistance of the MAF signal wire at the ECU and right after the MAF....

08-21-2009, 02:09 PM	#13
Vr-4-Life Tri-State Post Whore Join Date: May 2006 Location: Philly PA Member #1961 My Ride: BMW E60 M5 V10 6 Speed --- Ducati Monster 696 iTrader: (4)	Whats up with your ECU? can you get any diagnostics out of it? Can you log data from it?

08-22-2009, 09:32 AM	#19
Honduh Tri-State Post Whore Join Date: May 2006 Member #1977 iTrader: (0)	If your coupler is leaking AFTER the maf it could easily cause this problem. If its sucking in air that isn't metered by the MAF its going to make the ecu say "wtf where did all this air come from I wasn't expecting this". And to all the guys saying you NEED a iac - lolololololololol

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