7mgte hesitation *videos* help me

ccguy · 06-15-2012, 05:00 AM

so this started as a cel 52 i rewired it with new rg58 wire and it fixed the cel. the problem was this hesitation. as soon as the hiccup would happen the cel 52 would come on so i thought it was a knock sensor problem.
now there is and are no cel codes showing or stored.
but between 1800-2800 there is a hesitation that as you can see in the videos it just falls on its face like a car running out of gas.
i just replaced the TPS with a new one and set it to spec. and it still has it the same as before. it is driving me nucking futts, i can open the throttle and it will fall on its face and not accelerating. but if let off and gas it again it sometimes will blow right through the hiccup range.
i can feather and rev it over the 2800 rpm it runs strong and no problems are evident. like in one of the videos.
-i do not have any intake leaks that i found by pressuring the IM from the first turbo coupler to the head.
-i have the oe fuel dampener on the fuel rail.
-the injectors are firing in a constant sequence when it is choking (listening through a stethoscope)
-timing is set to 10 deg btdc
http://www.youtube.com/watch?v=GjEox...hannel&list=UL
http://www.youtube.com/watch?v=TfSSCT24uAA
http://www.youtube.com/watch?v=8im9_...hannel&list=UL

cre · 06-16-2012, 07:25 AM

Have you checked the fuel pressure?

ccguy · 06-23-2012, 06:02 PM

i dont think it is fuel pressure. the plugs are dry sooty, and the fuel is going fast.
i changed the cps and same things. no boost leaks, i tested using the smoke trick and the soapy water while pressurizing the manifold.
i am starting to really lean to the afm or the wiring to the ecu from the tps??????????????????????????????????????????????? ????????

cre · 06-23-2012, 07:00 PM

Well, you can test the AFM to a degree as detailed in the TSRM. As for the TPS you should. Test the voltage at the VTA pin at the ECU. You should see around.5v up to about 4.8v as it the throttle is open and closed. It might be 3.8v on the high side, I can't recall at the moment.

Are you certain you don't have a knock?

ccguy · 06-24-2012, 02:48 AM

i dont think i do? i cant hear one. but i would hate to think i might have one. i just rebuilt the motor.
the motor was left in the supra with the hood open and half taken apart when i bought it from the guy. i have fought wasp pupas in the vacuum lines and a mess of other things so it makes me question all of the electronics in the engine bay. since the original tps that came with the motor was bad...

ccguy · 06-24-2012, 04:45 AM

even if it was knocking it would not explain the cracked throttle and accelerating.

cre · 06-25-2012, 10:19 PM

I didn't have a chance to really look this over before. A couple things I'd look at are the fuel pump relay and resistor pack, try an alternate ECU, try an alternate AFM. Is the fuel pressure up VSV connected, functional and properly routed?

I didn't recognize a wideband in you gauge set there. If you have access to one log it or at least make a video so we can see what's going on when it bogs.

Did you test the TPS signal at the ECU as I mentioned? What about the AFM (honestly I'd just try to borrow a known good one as I don't expect you have the equipment and documentation to test it copletely).

ccguy · 07-08-2012, 08:50 PM

bad wiring from the tps to the ecu. ran new wires from the tps to the afm/eng temp sensor and ecu. fixed the problem

cre · 07-08-2012, 10:42 PM

Excellent. I'm glad you got it sorted out. Thanks for posting back with the final results.

06-15-2012, 05:00 AM	#1
ccguy 3" Exhaust Join Date: Jun 2012 Location: az Posts: 50	*7mgte hesitation videos* help me** so this started as a cel 52 i rewired it with new rg58 wire and it fixed the cel. the problem was this hesitation. as soon as the hiccup would happen the cel 52 would come on so i thought it was a knock sensor problem. now there is and are no cel codes showing or stored. but between 1800-2800 there is a hesitation that as you can see in the videos it just falls on its face like a car running out of gas. i just replaced the TPS with a new one and set it to spec. and it still has it the same as before. it is driving me nucking futts, i can open the throttle and it will fall on its face and not accelerating. but if let off and gas it again it sometimes will blow right through the hiccup range. i can feather and rev it over the 2800 rpm it runs strong and no problems are evident. like in one of the videos. -i do not have any intake leaks that i found by pressuring the IM from the first turbo coupler to the head. -i have the oe fuel dampener on the fuel rail. -the injectors are firing in a constant sequence when it is choking (listening through a stethoscope) -timing is set to 10 deg btdc http://www.youtube.com/watch?v=GjEox...hannel&list=UL http://www.youtube.com/watch?v=TfSSCT24uAA http://www.youtube.com/watch?v=8im9_...hannel&list=UL

06-16-2012, 07:25 AM	#2
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Have you checked the fuel pressure? __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

06-23-2012, 07:00 PM	#4
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Well, you can test the AFM to a degree as detailed in the TSRM. As for the TPS you should. Test the voltage at the VTA pin at the ECU. You should see around.5v up to about 4.8v as it the throttle is open and closed. It might be 3.8v on the high side, I can't recall at the moment. Are you certain you don't have a knock? __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

06-25-2012, 10:19 PM	#7
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	I didn't have a chance to really look this over before. A couple things I'd look at are the fuel pump relay and resistor pack, try an alternate ECU, try an alternate AFM. Is the fuel pressure up VSV connected, functional and properly routed? I didn't recognize a wideband in you gauge set there. If you have access to one log it or at least make a video so we can see what's going on when it bogs. Did you test the TPS signal at the ECU as I mentioned? What about the AFM (honestly I'd just try to borrow a known good one as I don't expect you have the equipment and documentation to test it copletely). __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

07-08-2012, 10:42 PM	#9
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Excellent. I'm glad you got it sorted out. Thanks for posting back with the final results. __________________ If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum. If you're so inclined I'm always more than happy to accept tips via PayPal. Tip Jar --->

06-23-2012, 06:02 PM	#3
ccguy 3" Exhaust Join Date: Jun 2012 Location: az Posts: 50	i dont think it is fuel pressure. the plugs are dry sooty, and the fuel is going fast. i changed the cps and same things. no boost leaks, i tested using the smoke trick and the soapy water while pressurizing the manifold. i am starting to really lean to the afm or the wiring to the ecu from the tps??????????????????????????????????????????????? ????????

06-24-2012, 02:48 AM	#5
ccguy 3" Exhaust Join Date: Jun 2012 Location: az Posts: 50	i dont think i do? i cant hear one. but i would hate to think i might have one. i just rebuilt the motor. the motor was left in the supra with the hood open and half taken apart when i bought it from the guy. i have fought wasp pupas in the vacuum lines and a mess of other things so it makes me question all of the electronics in the engine bay. since the original tps that came with the motor was bad...

06-24-2012, 04:45 AM	#6
ccguy 3" Exhaust Join Date: Jun 2012 Location: az Posts: 50	even if it was knocking it would not explain the cracked throttle and accelerating.

07-08-2012, 08:50 PM	#8
ccguy 3" Exhaust Join Date: Jun 2012 Location: az Posts: 50	bad wiring from the tps to the ecu. ran new wires from the tps to the afm/eng temp sensor and ecu. fixed the problem

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
7MGTE to 7MGE	karu	MKIII Supra	4	10-22-2010 07:22 AM
Need help please. 7mgte	Toyota1	MKIII Supra	4	05-22-2010 08:33 AM
Twin turbo on 7mgte?	supraman121	MKIII Supra	7	08-24-2007 02:12 PM
7mgte front clip	supraman121	MKIII Supra	4	05-31-2007 01:27 PM
7mgte and 7mge question	supraman121	MKIII Supra	2	01-12-2007 09:09 PM