I've got a problem with my Supra.
I was on a trip and when I came back I turned off the car for about 1 Minute and after that I couldn't start the car again.

Some weeks ago I had some trouble with the fuel (okay, I still have those troubles *g).
I think one of the two walbros is not working (well).
The car stotters when there is less than 40 liters in the fuel tank.
First I had some terrible lambda values (17-18) and after I fulled up the car I had lambda values from 10-12.
I would like to check the plugs and perhaps install new ones.
I've got the Denso IK24. How much do I have to gap those plugs ?

Where else could be the problem ? Crank position sensor ?

Perhaps Sean McElderry can help, he has tuned my AEM months before.


thanks for helping
cheers Marc




Specs:
AEM ECU
5 Bar Map Sensor
IAT Sensor
ARP Head stuts
Blitz Nür Spec 'R Exhaust
Blitz SBC-iD Boostcontroller
Boost Logic's SFI approved crank damper
Boostlogic T67 turbokit, 3"
Boostlogic upgraded autotranny (PI 3800 stall)
Crower springs and titanium retainers
Denso iridium IK24 Plugs
EGR removed
FJO Wideband
GReddy pully set
HKS DLI
HKS FMIC Type R
HKS racing blow off type 2
HKS trac butterfly removal kit.
HKS wastegate (50mm, external)
JUN camgears (intake/exhaust) set to 0
PHR fuel system with 720cc Siemens injectors and dual walbro.
Stock cams

I just checked the plugs. Everything seems to be okay.
I also have fuel pressure.

Could there be a problem with the cold start mapping ?

It could be several things. The first thing I would look at is Stat sync'd on the troubleshooting screen. If this doesn't come on.....it won't start. If it doesn't come on...there is a problem with either your cam or crank sensor.

We checked the plugs, the MAP sensor and the fuel pressure. Everything is okay.

Today we were able to start the car again. We had to change the "idle vs rpm map" and calibrate the trottle position sensor (it was set to 3% ?!!)
The car runs now proper at idle but when accelerating the AEM enrichs but the car leans out !!!

We made 2 logfiles (see attached).
Also you can find attached the modified map. (we only made modifications on "trottle position sensor" and "idle vs rpm map")

Any ideas ? Do you need more logs ?
Is it possible that one of the injectors is failing ?

Log 1 (http://downloads.mkiv.de/SpeedUp/speedup_original_idle_vs_rpm_correction.stf)
Log 2 (http://downloads.mkiv.de/SpeedUp/speedup_test.stf)
Map (http://downloads.mkiv.de/SpeedUp/aem_speedup_supra_t67r.cal)

We checked the plugs, the MAP sensor and the fuel pressure. Everything is okay.

Today we were able to start the car again. We had to change the "idle vs rpm map" and calibrate the trottle position sensor (it was set to 3% ?!!)
The car runs now proper at idle but when accelerating the AEM enrichs but the car leans out !!!

We made 2 logfiles (see attached).
Also you can find attached the modified map. (we only made modifications on "trottle position sensor" and "idle vs rpm map")

Any ideas ? Do you need more logs ?
Is it possible that one of the injectors is failing ?

Log 1 (http://downloads.mkiv.de/SpeedUp/speedup_original_idle_vs_rpm_correction.stf)
Log 2 (http://downloads.mkiv.de/SpeedUp/speedup_test.stf)
Map (http://downloads.mkiv.de/SpeedUp/aem_speedup_supra_t67r.cal)

Fuel pressure is not increasing with boost. Go to your trunk and turn one fuel pump on, then turn your fuel pressure regulator all the way up. The pump should go to 90psi. Then do this on the other pump. Most likely one of the fuel lines in the tank ruptured or came loose.

Chris.

Both pumps are working fine.
All fuel lines are well and not leaking.
I turned the fuel pressure regulator all the way up and the fuel pressure went to 85 PSI.

After all I turned the fuel pressure back to 50 PSI and tried to start the car only with one pump activated.
The car starts but not proper. It sounds like a V8 engine and after some seconds the engine stopped.

I don't know which map is on the AEM at the moment. The "original" one from Sean or the "corrected".
Tonight I will check the map and will make sure the "original" Map is installed, then try to start the car again.
If the car starts, I don't know where the problem was. If not, the problem still exists :aiwebs_00

We checked the plugs, the MAP sensor and the fuel pressure. Everything is okay.

Today we were able to start the car again. We had to change the "idle vs rpm map" and calibrate the trottle position sensor (it was set to 3% ?!!)
The car runs now proper at idle but when accelerating the AEM enrichs but the car leans out !!!

We made 2 logfiles (see attached).
Also you can find attached the modified map. (we only made modifications on "trottle position sensor" and "idle vs rpm map")

Any ideas ? Do you need more logs ?
Is it possible that one of the injectors is failing ?

Log 1 (http://downloads.mkiv.de/SpeedUp/speedup_original_idle_vs_rpm_correction.stf)
Log 2 (http://downloads.mkiv.de/SpeedUp/speedup_test.stf)
Map (http://downloads.mkiv.de/SpeedUp/aem_speedup_supra_t67r.cal)

Did you look at the logs at all???? The problem is plain as day! I urge you to look at the logs and you will see the problem. I don't know how you could miss it, either you have a turbo that responds better than any P.D. blower ever dreamed, or you clearly have a map sensor problem.

Both pumps are working fine.
All fuel lines are well and not leaking.
I turned the fuel pressure regulator all the way up and the fuel pressure went to 85 PSI.

After all I turned the fuel pressure back to 50 PSI and tried to start the car only with one pump activated.
The car starts but not proper. It sounds like a V8 engine and after some seconds the engine stopped.

I don't know which map is on the AEM at the moment. The "original" one from Sean or the "corrected".
Tonight I will check the map and will make sure the "original" Map is installed, then try to start the car again.
If the car starts, I don't know where the problem was. If not, the problem still exists :aiwebs_00

Your base fuel pressure should be 40psi. You are flooding your motor with fuel. You may need to crank it awhile for it to start now, or pull your plugs out and crank it to get the fuel out of the cylinders.

Chris.

Okay, I will lower the fuel pressure to 40 PSI and check also the MAP sensor again.

The IAT-Sensor has permanent 25 C°. Is this the failsafetemperatur ?

Okay, I will lower the fuel pressure to 40 PSI and check also the MAP sensor again.

The IAT-Sensor has permanent 25 C°. Is this the failsafetemperatur ?

The IAT sensor should match outside temp when car has not been run for awhile. Under cruise it should also be slightly above outside temp.

Chris.

So it looks like I've got (also) problems with my IAT-Sensor. Great :help:

Can I check the IAT with a volt meter ? How much volt should I normaly measure ?

So it looks like I've got (also) problems with my IAT-Sensor. Great :help:

Can I check the IAT with a volt meter ? How much volt should I normaly measure ?

I'm not totally sure if the IAT sensor is voltage based or resistance based. You've probably not wired it properly. As I recall, the 2 wires go to the MAF or one to maf, one to ground. Can't remember which.

Chris.

yeah your sensors are messed up...look at your logs, the engine load is like 40psi at idle....thats bad

I wired the IAT-Sensor to the pink/blue and brown/black wire (next to the Mass Airflow Plug).

Today I checked the IAT Sensor and the wiring.
Everything is okay. The sensor is working and the wiring is also okay. :aiwebs_00

yeah your sensors are messed up...look at your logs, the engine load is like 40psi at idle....thats bad

Do you mean the MAP sensor is the problem ?

Did you look at the logs at all???? The problem is plain as day! I urge you to look at the logs and you will see the problem. I don't know how you could miss it, either you have a turbo that responds better than any P.D. blower ever dreamed, or you clearly have a map sensor problem.

Did you miss this post from awhile ago....the first logs you posted showed it to be the culprit.

What do I have to change on the map when I want to go with the more accurate AEM 3,5 bar map sensor ?

Just check the 3,5 bar map sensor instead of the 5 bar on the map sensor wizard ? That's all ?

@1BADSUPRA & @ChrisB

Could you please take a look at my new logs ? Thank you.

http://www.thesupraforums.com/showthread.php?t=1118


BTW: I just ordered a new Map sensor but I'm still waiting for it.

it sounds like all my buddies getting together to work on one of ur rides.

@1BADSUPRA & @ChrisB

Could you please take a look at my new logs ? Thank you.

http://www.thesupraforums.com/showthread.php?t=1118


BTW: I just ordered a ned Map sensor but I'm still waiting for it.

The map sensor looks to be reading in log 3, I just looked at one. You are really....really lean.. I would suggest you hire someone to dial that thing in for you before you blow up your engine. There are several guys that you can fly out to tune for you, and I think some people in your area as well.