stage 4 vf22 engine cutting out... possible boost leak? UTEC log inside.

knertified · 11-27-2004, 02:48 PM

This happens generally in 3rd or 4th gear at full throttle. It is not at a certian RPM. Some times its at 18-19psi, sometimes at 15-16psi.. I have a hyperflow V2 TMIC... I think it may be the stock turbo inlet hose which is crap or the intake manifold tube connected to the intercooler. Although I am not positive its a boost leak, possibly fuel? Take a look...

EDIT: Added Columns..

Code:

RPM	MAP(PSI) MAP(V)  TPS%	MLP	KNOCK	A/F	WG	Boost(CL)

4278	19.2	4	98	100	0	  rich	40	250
4312	19.4	4.2	98	100	0	  rich	47	250
4474	19.4	4.1	98	100	0	  rich	42	250
4604	19.8	4.3	98	100	0	  rich	42	250
4444	19.4	3.7	99	100	0	13.8	52	250
4566	18.8	4.3	53	100	0	  rich	45	250
4636	13.1	2.5	0	0	0	  rich	8	ECU.  
4456	5.9	2.4	0	0	0	14.6	13	ECU.  
4130	-1.2	2.4	0	0	0	  lean	13	ECU.  
3866	-7.5	2.3	0	0	0	24.5	14	ECU.  
3565	-8.7	2.2	0	0	0	24.5	15	ECU.  
3258	-9.1	2.2	0	0	0	24.5	17	ECU.  
3106	-9.6	2	0	0	0	24.5	18	ECU.  
3055	-9.8	2	0	0	0	  lean	16	ECU.

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CMJ · 11-27-2004, 03:22 PM

Looks like your hitting boost cut. If you have not changed the parameters then it is set to 20psi and you are running very close to that.

knertified · 11-28-2004, 09:16 PM

I was thinking it was possibly that but doesnt a CEL flash when that happens? It did before when I didn't have utec and was running a ebc.

CMJ · 11-28-2004, 11:16 PM

Not always. In this case I'm 99.99% sure that you hit boost cut.

knertified · 11-29-2004, 12:40 AM

Quote:

Originally Posted by CMJ

Not always. In this case I'm 99.99% sure that you hit boost cut.

Yeah I think you are right on this.. I will hold off until i get tuned next weekend and still see if i have the problem. The tuner will probally raise it a little and we will see how it goes. Thanks!

SlideWRX · 11-29-2004, 09:14 AM

Look at the line with 4444 rpm - the MAF voltage drops a LOT. if it was a boost leak, the MAF wouldn't drop, as the turbo would be pushing more air (some of it not into the engine). looking at the A/F part going lean (13.8), The air is still there, just not recorded on the MAF. Perhaps a loose wire to the MAF cutting out?

Tom

mick_the_ginge · 11-29-2004, 10:17 AM

Flick the FCD on the UTEC hardware itself. This will ensure you never hit ECU generated Boost Fuel cut.

Enable the boost cut in the Open loop fueling menu.

11-27-2004, 02:48 PM	#1
knertified Scooby Newbie Member#: 33244 Join Date: Feb 2003 Chapter/Region: NESIC	stage 4 vf22 engine cutting out... possible boost leak? UTEC log inside. This happens generally in 3rd or 4th gear at full throttle. It is not at a certian RPM. Some times its at 18-19psi, sometimes at 15-16psi.. I have a hyperflow V2 TMIC... I think it may be the stock turbo inlet hose which is crap or the intake manifold tube connected to the intercooler. Although I am not positive its a boost leak, possibly fuel? Take a look... EDIT: Added Columns.. Code: RPM MAP(PSI) MAP(V) TPS% MLP KNOCK A/F WG Boost(CL) 4278 19.2 4 98 100 0 rich 40 250 4312 19.4 4.2 98 100 0 rich 47 250 4474 19.4 4.1 98 100 0 rich 42 250 4604 19.8 4.3 98 100 0 rich 42 250 4444 19.4 3.7 99 100 0 13.8 52 250 4566 18.8 4.3 53 100 0 rich 45 250 4636 13.1 2.5 0 0 0 rich 8 ECU. 4456 5.9 2.4 0 0 0 14.6 13 ECU. 4130 -1.2 2.4 0 0 0 lean 13 ECU. 3866 -7.5 2.3 0 0 0 24.5 14 ECU. 3565 -8.7 2.2 0 0 0 24.5 15 ECU. 3258 -9.1 2.2 0 0 0 24.5 17 ECU. 3106 -9.6 2 0 0 0 24.5 18 ECU. 3055 -9.8 2 0 0 0 lean 16 ECU. * Registered users of the site do not see these ads. Last edited by knertified; 11-28-2004 at 09:47 PM.

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11-27-2004, 03:22 PM	#2
CMJ Scooby Specialist Member#: 39235 Join Date: Jul 2003 Location: L.A., CA	Looks like your hitting boost cut. If you have not changed the parameters then it is set to 20psi and you are running very close to that.

11-28-2004, 09:16 PM	#3
knertified Scooby Newbie Member#: 33244 Join Date: Feb 2003 Chapter/Region: NESIC	I was thinking it was possibly that but doesnt a CEL flash when that happens? It did before when I didn't have utec and was running a ebc.

11-28-2004, 11:16 PM	#4
CMJ Scooby Specialist Member#: 39235 Join Date: Jul 2003 Location: L.A., CA	Not always. In this case I'm 99.99% sure that you hit boost cut.

11-29-2004, 09:14 AM	#6
SlideWRX Scooby Specialist Member#: 3803 Join Date: Jan 2001 Chapter/Region: MWSOC Location: SouthEast Michigan Vehicle: 07 Mustang GT Ford Crappy Paint White	Look at the line with 4444 rpm - the MAF voltage drops a LOT. if it was a boost leak, the MAF wouldn't drop, as the turbo would be pushing more air (some of it not into the engine). looking at the A/F part going lean (13.8), The air is still there, just not recorded on the MAF. Perhaps a loose wire to the MAF cutting out? Tom

11-29-2004, 10:17 AM	#7
mick_the_ginge Citizen Mick Member#: 27646 Join Date: Oct 2002 Chapter/Region: NWIC Location: Portland, Oregon Vehicle: 2003 Sleeved 2.5 Oil Dry Sump Goodness	Flick the FCD on the UTEC hardware itself. This will ensure you never hit ECU generated Boost Fuel cut. Enable the boost cut in the Open loop fueling menu.