1JZ microtech issue, Fires up then dies

[Biggo]

So a few weeks ago I had wired up a microtech LTX-12 onto an JZA70 1jz. Story goes the old ecu was playing up intermittently and kept getting error code 14 (no igf signal) We tried everything, got the ecu repaired, spare ignitor, checked the whole fucking loom 10 times and it still did it. Sometimes it ran sometimes it didnt. I started raging and pulled the whole setup, binned it and put a spare microtech in it.

Now it doesnt do anything. What it does do is:

Turn key, hear fuel pump prime
Cranks fine then fires
Dies before it even gets a home reference or 1 revolution
Continuous cranking does nothing either. Things i have checked

All wiring (loom was off a running 2jz)
relay wire for coils and ecu gets power on crank and ign on
fuel pump works
crank and cam timing is spot on
Tried 188345 different ways to wire the cam and crank sensors
TPS reads 00% on the microtech dash, unplugging it and cracking the throttle while cranking does nothing
It does not like throttle when it fires at all

I have also blocked off the iscv/bov port on the manifold, the coolant lines are still there though.


So all im asking for is some ideas, anyone got some please spend 2 mins and spell it out. PLEASE! my hair is going grey and i cant afford to pull it out.

[J0RD0]

where in bris are you?

[Biggo]

Not Brisbane, On the sunshine coast

[dumbass]

dont u just love wiring
soo many people thing they can do it themselve but when problems
happen they start raging and pull their hair out heheeheheh

thats y to get a proper job done it costs a shitload and no one wants to pay it hehehehe

does the hanrdset turn off during cranking
if u crank it for awhile do u get rpm signal on handset

should be around 200 rpm

pull all coils out and sit on rocker cover
sit good spark plugs in them and crank motor
does all spark plugs spark

go back to basics
check all coils for firing not jut the first one

same with injecotrs
put a noid light on all injecotrs one at a time

spray aerostart down throttle body see if it keeps runnign longer
if no spark or injection then u have crank or cam sensor problem

was engine pulled apart at all
bent crank relucotr ?
fkt cam sensor?
get an oscilliscope and test crank and cam sensors

i could come up to sunshine coast and look at it but it will cost abit
so see if someone will do it for free

[Ken_T]

Buy this little guy here
http://www.ebay.com.au/itm/ARM-DSO-N...item2c54772c4e and watch your CAS signal, not that it'll help a while lot.

But yeah, the first thing I'd do is make sure the hand controller is showing some consistent RPM while cranking. Can you watch the signal on the laptop like you can a megasquirt? It is set up to 24/1 yeah? It probably is but I'm just checkin.

[midnight_purple_GA70]

when you say its a spare... is the tune anywhere near correct for your setup?

coil pack grounds good?

[Biggo]

dont u just love wiring
soo many people thing they can do it themselve but when problems
happen they start raging and pull their hair out heheeheheh

thats y to get a proper job done it costs a shitload and no one wants to pay it hehehehe

does the hanrdset turn off during cranking
if u crank it for awhile do u get rpm signal on handset

should be around 200 rpm

pull all coils out and sit on rocker cover
sit good spark plugs in them and crank motor
does all spark plugs spark

go back to basics
check all coils for firing not jut the first one

same with injecotrs
put a noid light on all injecotrs one at a time

spray aerostart down throttle body see if it keeps runnign longer
if no spark or injection then u have crank or cam sensor problem

was engine pulled apart at all
bent crank relucotr ?
fkt cam sensor?
get an oscilliscope and test crank and cam sensors

i could come up to sunshine coast and look at it but it will cost abit
so see if someone will do it for free

Hmm a few ideas there. The dash does not turn off while cranking. Shows 250rpm when it does.

Ive checked all the injectors and coilpack wiring with a noid light, all is well there. Checked and rechecked that the plugs went to the correct ones.

Cam and crank sensors are within specs. Motor hasnt been pulled apart by me but its entirely possible somebody fucked the crank pickup. Will try areostart sometime today.

Buy this little guy here
http://www.ebay.com.au/itm/ARM-DSO-N...item2c54772c4e and watch your CAS signal, not that it'll help a while lot.

But yeah, the first thing I'd do is make sure the hand controller is showing some consistent RPM while cranking. Can you watch the signal on the laptop like you can a megasquirt? It is set up to 24/1 yeah? It probably is but I'm just checkin.

Haha Ken, ive never used an oscilloscope in my life, theres a couple kicking around at work but im not going near them. The ecu was sent to microtech for upgrade and basemaped for a 1jz.

when you say its a spare... is the tune anywhere near correct for your setup?

coil pack grounds good?

Coilpacks dont have grounds, they are bolted to the head.

[midnight_purple_GA70]

there is 2 black ground wires in the microtech loom for coils... should be grounded to intake manifold was what i was meaning sorry

[Ken_T]

You said you have a pulse at the coil but does the coil have a strong spark?

Get the scope and put one of the signal wire to a coil and put the other to an injector, I'm guessing it's a two channel. As the car starts up, see which one stops pulsing. Then you know which side is the problem as least. Quit horsing around and use the scope! you have access to one!

[Biggo]

Had a doodle around yesterday with noid lights and areostart. Spark and fuel happens but wrigling some wires caused it to have itermittent cranking signal. Might remove the belt and see it improves as the cas plug sits ontop of the alternator.

[1JZ-Rolla]

Something I don't understand:

You said it doesn't even get a home signal, and you get an intermittent crank signal

Yet you have a steady RPM reading while cranking on the dash.........


which one is it? Cause I can't see how you'd have one without the other.


Are your cam and crank angle sensor looms shielded? Even if not, i'd only expect you to be getting lots of interference which causes erroneous spark events (backfires etc) not a dead motor altogether.


Good luck with it mate, sounds like you've got a bit of a lame donkey to fix

[dumbass]

what is the condition of the loom
does the original loom wiring job look ok
would u use it on one of her majesty the queen's cars
i find 60 to 80% of wiring jobs i would even feed to my dog

if u have intermitent problems and if the loom looks average due to the previous owner/wirier
then best to strip it all down and go over it otherwise u will have more headaches than your code 14
on your 1j std ecu which would have been easier to fix than this microwreck hehehe

[Biggo]

So yair heres an update.

Loom is good, looks far better than i would have don but im not a fan of this covering he put over it. Its like Ortack seriously.

Crank and cam signal was fgood last time i checked it, it keeps firing even after the motor started and died. Same for injectors. Noticed the fuel was a dribble last time i pulled the return line offf so i hooked up a pressure guage to the feed and its fluttering around 6psi. probably releif valve stuck or sumat. New pump is in the mail, wired up the digi dash so i can see shit now and ill see what happens when the pump is in.

[CELICASUPRA7M]

so after it primes there is still only 6psi fuel pressure? maybe the pump is only getting voltage at the crank position, and not the on postion?

[dumbass]

thats y i said try run it on aerostart
will help u figure if its fuel related