2JZGE-T Won't Start When Warm

[Turismo07]

Hi,

I have just purchased a Supra NA-T with a Haltec stand alone ECU.

Everything runs fine and I've spoken to the workshop who did the work on the car and everything is fine.

However I've just discovered that when the engine reaches normal running temps and I shut it off and try to restart it won't.

Using an aftermarket temp gauge (sensor in the top rad hose), normal running temps are 82-88 degrees, and I can't get it to start until I wait for the temps to drop to around 65 degrees...

When trying the start, the engine will just crank. No sign of it trying to fire at all. When it does finally start, it'll usually cough and not hold revs at idle, so I'll nurse it using the throttle and after about 20secs it'll smooth out and idle like normal.

I can hear the fuel pump so I don't think its a fuel issue. The distributor cap, rotor button, ignition leads, sparks plugs, and idle control valve are all 1,000km old.

I've had these symptoms in other vehicles before and they were caused by faulty crank angle sensors and cam angle sensors that wouldn't work when they got hot. After researching the 2JZGE apparently these sensors are in the distributor... Is this correct?

Anyone had this issue before and solved it? Could it be the crank angle and cam angle sensor, if yes can they be replaced or do I need to replace the whole distributor?

Thanks for any help you guys can give.

[dumbass]

its most probably tune related

[bk_]

Got access to the tune?

Prime Pulse Time table? (injectors?)

What does it rev to when it's cold/warm/hot? it should hit ~1800 RPM and quickly drop to target RPM. Otherwise, the absolute position of the stepper motor is incorrect or some other fundamental setting is wrong (eg: Post Start Offset %).

As for tune settings, from my experience (albeit with another aftermarket ECU), I have the IACV stepper motor to open +40 steps on prior to start ("Post Start Offset %") whether cold/warm/hot, which if converted to Haltech settings, is around 25%, instead of 15-10%. Although I only hold it there over 1 second, instead of tapering off over 3 seconds. Most likely not a problem.

[Turismo07]

Got access to the tune?

Prime Pulse Time table? (injectors?)

What does it rev to when it's cold/warm/hot? it should hit ~1800 RPM and quickly drop to target RPM. Otherwise, the absolute position of the stepper motor is incorrect or some other fundamental setting is wrong (eg: Post Start Offset %).

As for tune settings, from my experience (albeit with another aftermarket ECU), I have the IACV stepper motor to open +40 steps on prior to start ("Post Start Offset %") whether cold/warm/hot, which if converted to Haltech settings, is around 25%, instead of 15-10%. Although I only hold it there over 1 second, instead of tapering off over 3 seconds. Most likely not a problem.

It usually revs to ~1,800rpm. When cold it'll stay there for maybe 20-30secs then slowly drop down to normal idle speed of 1,000rpm. When warm/hot (If I ever get it to start then lol), it'll drop back almost immediately to normal idle.

I don't have access to the tune as I need a new laptop. WTFauto is the workshop that did the work and tune (very basic quick tune) and I've seen the tune on his computer etc. I do plan to go back to him within the next month or so to have the tune more 'fine tuned' after some other mods I'm doing.

BTW do you own the car in your avatar? I'm pretty sure I've driven past you about a 100 times on Alex Dr every morning on my way to work and I saw your car in the Alex Heights shopping centre carpark a few weeks back. Nice clean car. What motor you running? I now figure it must be a Toyota motor, but always thought that you had turbo'd the Merc engine and thought that was pretty rare and cool if you had, but a Toyota transplant makes more sense in every way!

[bk_]

Hard to say what's the problem, but most likely related to Idle "Start Position" and also "Post Start Offset".

Worse case, prime pulse time table.

BTW do you own the car in your avatar? I'm pretty sure I've driven past you about a 100 times on Alex Dr every morning on my way to work and I saw your car in the Alex Heights shopping centre carpark a few weeks back. Nice clean car. What motor you running? I now figure it must be a Toyota motor, but always thought that you had turbo'd the Merc engine and thought that was pretty rare and cool if you had, but a Toyota transplant makes more sense in every way!

Yeah, that would be me although not sure about the "every day" part, since I haven't driven to work on a daily basis since 2008.

Motor is 1JZ, stock twins, W58 gearbox, and aftermarket ECU.

[Turismo07]

Hard to say what's the problem, but most likely related to Idle "Start Position" and also "Post Start Offset".

Worse case, prime pulse time table.



Yeah, that would be me although not sure about the "every day" part, since I haven't driven to work on a daily basis since 2008.

Motor is 1JZ, stock twins, W58 gearbox, and aftermarket ECU.

Thanks for the info, I'll look into the start position and post start offset.

Yeah that's prob a exaggeration, I've been taking that route to work every day since 2007 and have seen you car a number of times over the years .