7MGTE Fuel Cut at 2700rpm

[kaiser]

Ok So

Lex AFM, 550cc INJ, Walbro 255lph Fuel is at 35psi.

I Try to rev the car in neutral and at 2700rpm my wideband shows it leaning out in spikes and it wont rev higher. The ECU tests fine (5V on KS and VC when IGN on and 4V when running on KS). I Put my SAFC on it to see it it sees any signal from KS and it sticks at 3hz constant. Not sure if SAFC is pooched. I have run it with No afc if that is what someone is going to suggest.

Less then 1 ohm between KS at afm and KS at ECU.

I was thinking Bad AFM but I pulled codes 21 and 51 (TPS wiring is also good as is O2 sensor wiring) O2 sensor is Brand New and TPS bench tested fine.

SO confused.

 

[jetjock]

Who's that in your avatar?

 

[IndigoMKII]

Ok So

Lex AFM, 550cc INJ, Walbro 255lph Fuel is at 35psi.

I Try to rev the car in neutral and at 2700rpm my wideband shows it leaning out in spikes and it wont rev higher. The ECU tests fine (5V on KS and VC when IGN on and 4V when running on KS). I Put my SAFC on it to see it it sees any signal from KS and it sticks at 3hz constant. Not sure if SAFC is pooched. I have run it with No afc if that is what someone is going to suggest.

Less then 1 ohm between KS at afm and KS at ECU.

I was thinking Bad AFM but I pulled codes 21 and 51 (TPS wiring is also good as is O2 sensor wiring) O2 sensor is Brand New and TPS bench tested fine.

SO confused.

Code 51 doesn't mean a bad TPS, it means a mis-calibrated TPS. No IDL signal IIRC.

 

[3p141592654]

If its rev limiting at 3000 rpm then there should be a code 31. Check codes again.

 

[mkiiibro]

My brothers car has been doing this for about a month as well. He can drive it all day without getting into boost, but as soon as he starts rolling into the throttle he gets the same kind of cut out

 

[3p141592654]

Different problem. OP can't rev in neutral.

 

[BryanDyer]

what do you have the throttle positions for hi and low set to on he safc?
idk if that affects revving in nuetral but in mine I had my afc set wrong so Is I would go more than 10-20% on throttle it would cut out
are you sure it's an rpm thing and not a throttle thing?

 

[kaiser]

The SAFC is not Intercepting the KS signal at present. I just have it Monitoring Throttle, Rev and KS.

Originally I had a 31 but when I pulled my EFI fuse it went away. I believe it was only there because I had installed the SAFC and intercepted the KS signal.

I will check again tomorrow.

I will Re calibrate the TPS tomorrow as well.

Keep the Insight coming! It really helps boys!

 

[kaiser]

Also it is running pig rich. 10afr at idle. Plugs are black and fouled. This is why i got an SAFC. To try and lean it out.

 

[supraguy@aol]

I would guess an intercooler pipe leak, based on the rich condition, along with fuel cut.
But of course, my guess and a $1.50 will get you a cup'a joe at waffle house.

 

[jetjock]

Also it is running pig rich. 10afr at idle. Plugs are black and fouled. This is why i got an SAFC. To try and lean it out.

Crack me up. Details, details...

 

[IndigoMKII]

My brothers car has been doing this for about a month as well. He can drive it all day without getting into boost, but as soon as he starts rolling into the throttle he gets the same kind of cut out

Probably a bad boost leak.

 

[3p141592654]

Also it is running pig rich. 10afr at idle. Plugs are black and fouled. This is why i got an SAFC. To try and lean it out.

Say what! Sucked in again....

 

[kaiser]

So Boost leak is the General consensus? Even though my SAFC tells me there is no frequency coming from the AFM? I don't get an AFM code when I run it though. Very Weird. Maybe this SAFC is NFG?

 

[jetjock]

Why would you get a SAFC to correct 10 afr @ idle? Did it have anything to do with your avatar?

 

[Rollus]

edit: my bad, you already did the test I've proposed.

 

[Rollus]

I would guess an intercooler pipe leak, based on the rich condition, along with fuel cut.
But of course, my guess and a $1.50 will get you a cup'a joe at waffle house.

Same guess here.

For rich and limp mode:

If the Karman Vortex air flow meter system were to fail completely the TCCS will enter Fail Safe mode. Under this mode injection pulse width and ignition timing will be set to the Fail safe fixed values based on other engine sensor conditions. This is the normal injection pulse width and ten degrees fixed ignition timing.

 

[kaiser]

Why would you get a SAFC to correct 10 afr @ idle? Did it have anything to do with your avatar?

I got the SAFC Because 10AFR is very rich and my plugs are really black

Same guess here.

For rich and limp mode:

Ok so my charge piping is pretty simple.

Turbo
Hump Hose Coupler
180' Aluminum Bend
45' Silicone
90' Aluminum Bend
Hump Hose Coupler

My Accordion Hose is a brand new Ebay coupler.

So I don't really have much to check. I will try to Spray starter Spray on any potential leak sites and listen for a rev.


What is still really bugging me is whether or not my SAFC is NFG????? It does not read a Hz when I monitor the Karmen input. WTF? Anyone heard of this issue before?

 

[suprarx7nut]

This is real simple.

Who is in your avatar?

Take out the 550's, take out the lex afm and get it to run right without the safc.

Who is in your avatar?

Is she related to you? Is she really a he?

Who is in your avatar?

Sent from my Galaxy Nexus using Tapatalk 2

 

[80083r]

if you seriously want to know who that is in the avatar - you can drop an image on google image search... and get

this

some images may not be work safe.