1jz won't start

[roadkill]

Hi,

before you do that, check those cables that attach to that plug and make sure that they aren't damaged anywhere and are earthing out. It may not be enough to pop a fuse, but it might be enough to send a funky signal. The 1j in my celica would just rub on a bracket and it would earth out and pop a 30A fuse and the car would just die. Luckily i managed to find it by the bright flash it would make when i wiggled the loom around in the dark. Fixed in 5 mins

I'd doubt that it is the sockets that aren't connecting properly, but more likely that one of the wires isn't in the connector properly - if that's where the problem is.


bEn

[JZA70R_92]

what the feck...Just to be sure on the ecu side the pins are soldered good to the ecu board? having this issue with a AIRCON panel here at the moment wiggle and aircon goes off lol. but just do what ben suggested maybe a wire is loose in the crimped connecter within the plug if possible wiggle each individual wire whilst its running until you find the culprit?

[George]

+1 for pliers. I once had floating problem, figured out it was TPS-related, then narrowed search down to ECU side cause trouble depended on ECU movement. Then extracted the pin, squeezed it a bit and the car still works ok. Of course crimping new connectors or maybe soldering pieces of wire with good connectors is more reliable, but at least you would make sure that your 16pin connector is the problem.

[doommachine]

+1 for pliers. I once had floating problem, figured out it was TPS-related, then narrowed search down to ECU side cause trouble depended on ECU movement. Then extracted the pin, squeezed it a bit and the car still works ok. Of course crimping new connectors or maybe soldering pieces of wire with good connectors is more reliable, but at least you would make sure that your 16pin connector is the problem.

OK so I pulled out every pin from the 16 + 12 pin connector and worked out how to improve the connection - stuffing the tool I used to extract the pin in the back of the pin basically bends it back out. A couple of the pins when pushed over the ECU side pin were very very loose.

Now my ECU connectors are tight, wiggling them has no effect - but the car still runs like shit. But at least its consistent - it will consistently start.

it behaves in pretty much this way...actually it behaves exactly in this way.

http://www.youtube.com/watch?v=-zYJfVZXn7w

http://www.youtube.com/watch?v=026xC...=UL-zYJfVZXn7w

Opening the throttle smoothly causes it to effectively die, pulsing the throttle as the guy does in the video does allow revs to rise so long as I keep opening and closing it.

Sometimes when I start it, it runs beautifully BUT the idle is really high, it hasn't done this since I replaced the ISCV.

[roadkill]

Hi,

farks, that sounds horrible! Have you tried emailing the guy from that video to see what he did to fix it?

Also, i'm thinking it ***may*** be a fuel problem. I don't know too much about efi so i'm working on basics or timing/fuel/spark/compression. What happens if you supplement the current fuel supply with something via pressure pack can? Deodorant will do the trick, start ya bastard, wd40 etc etc. So once you actually get it running, try opening the throttle a bit and squirt it in. See what happens then? It might still be some sort of fuel issue. A blocked line/filter will do amazing things. My old HJ monaro used to randomly stop because the hose would just kink and starve it of fuel......... Theoretically it should throw an 02 code with this trick as well i'd guess.

bEn

[roadkill]

stupid dbl post

bEn

[doommachine]

Hi,

farks, that sounds horrible! Have you tried emailing the guy from that video to see what he did to fix it?

Also, i'm thinking it ***may*** be a fuel problem. I don't know too much about efi so i'm working on basics or timing/fuel/spark/compression. What happens if you supplement the current fuel supply with something via pressure pack can? Deodorant will do the trick, start ya bastard, wd40 etc etc. So once you actually get it running, try opening the throttle a bit and squirt it in. See what happens then? It might still be some sort of fuel issue. A blocked line/filter will do amazing things. My old HJ monaro used to randomly stop because the hose would just kink and starve it of fuel......... Theoretically it should throw an 02 code with this trick as well i'd guess.

bEn

Hmm.. it could indeed be that.... I'll have to grab some start ya bastard and see what happens. The filter is new but theres no guarantee there wasn't a bunch of crap in the line.

Possibly could be hammered injectors also? Looks like injectors are a PITA to remove in 1jz, hopefully not that.

[George]

It's much harder to fit your injectors back =) If you ever get them off better bring em to some place with flow test setup. Though you can clean em to some degree by yourself.

[roadkill]

Hi,

srsly, deodorant will do the job. Anything that has a hydrocarbon as the propellent in a pressure pack can. Try it n see.

bEn

Hmm.. it could indeed be that.... I'll have to grab some start ya bastard and see what happens. The filter is new but theres no guarantee there wasn't a bunch of crap in the line.

Possibly could be hammered injectors also? Looks like injectors are a PITA to remove in 1jz, hopefully not that.

[George]

with seriously stuffed injectors only ultrasonic thing + heated liquid will do the job completely, but I would agree that in most cases even carb cleaner spray will make things a bit better anyway. Only remrmber to clean them in backwards direction as well

[dumbass]

didnt someone on here or the crappy lextreme site have issues with a fuel hose banjo having the wrong
washer and therefore causing fuel flow issues
but doesnt the car run fine once in a blue moon
might be time to fit a fuel pressure gauge on it
if the car runs perfect sometimes then switches from good to bad randomly it usually points to ecu
if a sensor is faulty it normally stays faulty
if all your injectors are working properly and mechanically its fine then it has to be fuel flow or fuel injector duration
so by adding extra fuel or by crimping fuel lines to reduce fuel might point u in right direction

[doommachine]

with seriously stuffed injectors only ultrasonic thing + heated liquid will do the job completely, but I would agree that in most cases even carb cleaner spray will make things a bit better anyway. Only remrmber to clean them in backwards direction as well

Ahh.. yeah but I can hope that it isn't that. How can I test that they're blocked? The car does run perfectly sometimes as I said, to me the issue + its intermittance seems like an electronic issue.

[roadkill]

Hi,

yes it could be an electronic issue..... and guess what.... your fuel is delivered through........ an electronic fuel pump...... and the fuel is injected into your engine via an........ electronic fuel injector..........

bEn

[doommachine]

Hi,

yes it could be an electronic issue..... and guess what.... your fuel is delivered through........ an electronic fuel pump...... and the fuel is injected into your engine via an........ electronic fuel injector..........

bEn

Yes.. however those things still mechanically move fuel around. What I mean is, if it was a series of blocked injectors or fuel line, surely it would never be able to run smoothly, ever...

[doommachine]

Yes.. however those things still mechanically move fuel around. What I mean is, if it was a series of blocked injectors or fuel line, surely it would never be able to run smoothly, ever...

OK so I got some start ya bastard - also I worked out that injector 2 and 3 had been wired backwards... but it still made zero difference.

Anyway, pulled all sparkplugs out, they were all pretty wet with fuel, cleaned them off... car started and ran but more shit than ever before. I miss my 2000 rpm idle :/... sprayed some start ya bastard in when I managed to get it to idle and it smoothed the idle out. So, yes, must be a fuel supply issue. Like I said, fuel pump is already good, already tried bridging FP and B, no change, so next up I'll pull out the filter and see what happens.

Interestingly now that the car has the injectors wired correctly the car seems to backfire through the intake.. if I open the throttle slightly I hear that the ISCV closes and it seems ok, however with the throttle closed it seems like theres a lot of bangs through the intake.. so yeah, that would also point to shit fuel supply? Hopefully its just the filter and not a kinked hose.