1JZ starting issue - starts then stalls - also need TPS calibration specs

[pandaah]

yeh you may have a fuel pump ecu....

http://cgi.ebay.com.au/SOARER-1991-2...ts_Accessories


theres one i found on ebay... just to show a picture

[Bananaman]

yeh you may have a fuel pump ecu....

http://cgi.ebay.com.au/SOARER-1991-2...ts_Accessories


theres one i found on ebay... just to show a picture

Hmm, thanks. Doesn't look familiar, and i've had most of the car apart at some stage by now. Where would it live if it were in a jzz30?

I was under the impression that my wiring loom was partly jzx81, and stuff that i've come across seemed to agree with that - but then there's the computer itself, it doesn't make a lot of sense to wire a different ecu in, surely..

[wilbo666]

If you ask me you really need to find out how your car has been wired to trigger the fuel pump...

As said JZX90 uses a fuel pump ECU...

I wouldn't be surprised if it is currently setup to be triggered off the ignition signal....?

Cheers
Wilbo

[Bananaman]

If you ask me you really need to find out how your car has been wired to trigger the fuel pump...

As said JZX90 uses a fuel pump ECU...

I wouldn't be surprised if it is currently setup to be triggered off the ignition signal....?

Cheers
Wilbo

Well, the previous owner told me that the computer was JZA70, so i'm thinking he's not such a reliable source of wiring info, despite being the guy who built the car I guess i'm going to have to do some digging around with my multimeter...

Previously (or when it intermittently decides to work) - the way it behaves is to prime for about 3 seconds when you turn the key to on, then switch off again until the car starts - so if it were ignition power it'd be humming away the whole time would it not?

Speaking of humming away the whole time... If i cannot fix this in the next week i'll be kind of screwed - assuming i do something mildly better than a paper clip, is there anything stopping me / going to explode by driving around with the fuel pump bridged on via the diagnostic plug? (temporarily..)

[Cuzzo]

lol

dont do that

[Bananaman]

lol

dont do that

haha. But it's such an awesome idea

[Cuzzo]

does the piggyback have a fuel pump output?

[Bananaman]

does the piggyback have a fuel pump output?

Nope. Piggyback doesn't touch fuel pump wiring just injectors / ignition / map sensor etc

[allencr]

is there anything stopping me / going to explode by driving around with the fuel pump bridged on via the diagnostic plug? (temporarily..)

No, it's normally on 99.9999% of the time the ignition is on and 100% of the time the engine is running.
I do not know if there is anything else controlled by the COR.

Fuel pump running after a crash? That didn't seem to be a concern for any Jaguar MG Austin-Healey, whatever owner, but the reliability of SU pumps may have been a factor.

[Bananaman]

Yeah prefer not to wire it to ignition as a permanent solution, because i'd prefer not to have fuel gushing out if i have a serious stack, but to get me motoring for the time being.....

I don't think the COR itself is faulty, because changing it did nothing. I'm going to re-pull apart the passenger side of the dash, see if i can trace how the pump is powered, but i'll also take a look at the guts of the ecu to see if any capacitors look munted, on the off chance that could be a factor.

[MRZ]

I had done a lot of reading when I tried to wire up my car. This was a helpful read. http://www.toymods.org.au/forums/showthread.php?t=48702

There is more info on TC.net too.

I tried to use two relays as a COR and tried to get the JZX90 to trigger it but couldn't get it working. Gave up and got one of those tachometric LPG relay.

The tachometric was easy to install and made it so much easier amd less wires to stuff around with (ref above link).


edit
There is a fuel pump relay plug in the drivers kick panel. Worth checking I guess, mine made a funny sound in that area while I was trying to get the fuel pump to turn on.
The power wire to the fuel pump is in one of the two dash plugs under the ECU location. Forgot which one since after getting car started need not worry about any more wires.

[Bananaman]

Haha, i was just about to post to say that i found that my fuel pump was triggered by a peel cp30 gas safety switch, and refreshed the page to see your post about it... Thanks heaps for the info, legend. I just need to work out what part of it isn't working

[Cuzzo]

Microtech time?

[Bananaman]

Microtech time?

Yeah, that solves everything doesn't it?

I just flicked over ignition while I had the switch in my hand. Paired with it is a relay, that was stuttering to try and come on but didn't really manage to, when it did flicker the switch lit up briefly - so my money is on this being faulty. Annoyingly it looks like it has some sort of specific plug on it, with no wiring code written on it.. Looks very china spec, brand is "sun hold", and when i google the part number nothing is in english

[Bananaman]

well its lucky i'm not a gambling man, changing the relay didn't do shit

Here's hoping its the safety switch, if it's not that then this gets a whole lot harder, damnit.. haha