7MGTE fuelling problem- now with wiring pictures...

[RyleyMA61]

guys,

yet another problem, again, the car (7mgte ma61) is deciding to be a bit grumpy on startups.

yesterday i had the car taken in for a/c regassing, it started fine there, and when they drove it into the garage, but wouldn't start afterwards. symptoms:

it starts, and idles for a second (but running rather rough, sounds like 4 cylinders) then dies. Subsequently, it does not start, but cranks, is about to start and dies.

Now the a/c guys fixed the problem by playing with the fuel rail and getting some petrol into the injectors/cylinders... the equivalent of pouring petrol in the carbie on a carbied car.

now i drove the car a few times yesterday and today, it was fine, but has since done the same thing tonight at a friends house.

i'm assuming its either a clogged fuel line, fuel filter, fuel pressure regulator or fuel pump!

.....However I just need a tip/trick to get fuel up to the injectors so i can start the car, as it's going in on tuesday to my mechanic for an overhaul, and i'll get him to thoroughly inspected the fuel system then. what can i wind/pinch/whatever/etc to get it to start?....


i'm also thinking it might be linked to this problem, which has gone unsolved:
http://www.supraforums.com.au/forum/...hlight=surging

I thought this wet weather issue may be water in the fuel... don't know how, but the theory seems to fit. i've been told metho can make the water and fuel mix together and clean it out, but i'm reluctant to do this. any ideas on this theory and problem would be appreciated.

thanks heaps guys
cheers,
ryley

[EldarO]

simple soloution would be to dump your fuel and fill 'er up again

i havent had this problem with my 7M (yet ) but yeah, it sounds like either your fuel pump is mung, or your fuel filter is clogged to the shithouse.

my mate was having problems with his Silvia not starting, we replaced the fuel filter and it started pretty much the first time it cranked over from then on...

we later tipped the fuel filter up side down, and the most horrendous crap came out :O

switch your car to the "on" position, and go to the back of the car and have a listen for the fuel pump, alternatively, disconnect the line from the fuel pump to the filter, and get someone to switch it to "on", if fuel pours out, your fuel filter, or fuel rail/lines to fuel rail are clogged/buggered.

Eldar.O.

[Cressida91GLX]

with the bastard little 7M, whenever there is problem in idling, I know what I will do .
But your problem seems to be a bit different. You regassed it and than drove around in it with the AC on ( casuing it to heat more than necessary with AC fan not working or did you check?). So there can be two indications, first the HG is gone ( little chance in your case but get it TK tested if the problem is not solved by other ways). Second problem can be with IDLE control Valve, get it cleaned.

Also your problem is more related to fuel , so check your filter and pump they tend to die out.

[RyleyMA61]

eldaro- thanks for that, i'll give it a try. i'm going to replace the filter, get fuel lines checked and even possibly replace the pump, as i don't know how well the 5m pump will hold up under all my new modifications....

cressida- i've had many issues with my idle valve... it's odd, and it always checks out okay... which is really weird. i think my car has a few little electrical gremlins. pretty sure it aint a BHG as it was correctly re-done about 8 months ago and has given no trouble since...

so, i'm pretty sure its the pump or filter.... so i just need some sort of trick to get it started in the interim until tuesday-

thanks guys, rep all round.

[CrUZida]

Pump or filter is where I'd first be looking too.

If the car is wired correctly the pump should turn on as soon as you get to 'start'
Also you should be able to bridge +B and FP in the diagnostics box to turn the pump on manually (with the key 'on')

If the pump runs all the time with the key 'on' then someone has done some dodgy wiring and I'd look into getting it fixed.

I don't know what those mechanics claim they did with the fuel rail, but there is no 'pouring of fuel in the rail' like you can with a carby.
The only thing they could have done is use AeroStart down the intake track.

Also look into cleaning the ISCV and making sure the TPS is set to IDL

Fouled plugs are also a major cause of hard starting, but that should clean itself after a hard thrash.

[RyleyMA61]

alright thanks peewee. i'll do that check with +B and FP and see how i go. I'll also clean the ISCV and plugs for good measure. How does one check the TPS settings?

Thanks mate, appreciated.

[CrUZida]

http://www.supratsrm.com

[RyleyMA61]

http://www.supratsrm.com

lol thanks man, just before i'd read your reply i'd gone hunting for this

thanks!

[thechuckster]

also check that the AFM plug hasn't been bumped/damaged - fuel pump should give you a quick priming squirt, then turn off unless the motor is cranking/running and drawing air thru the AFM.

also, a disconnected TPS (or dodgy/damaged wiring to...) will also let you do little except idle the car.

cheers,
charels.

[CrUZida]

also check that the AFM plug hasn't been bumped/damaged - fuel pump should give you a quick priming squirt, then turn off unless the motor is cranking/running and drawing air thru the AFM.

Are you sure?
I've never heard that on any Toyota I've had.

[RyleyMA61]

thanks guys, managed to get the car started, but it did not run well (idled way too high and tacho didn't work :S) but it then died again.

i was playing around and found the following plugs unplugged. (see picture).

Plugs A and C were unhooked, and i figured they must be the problem. I hooked them up, the car ran, but no tacho, and idled like a madman.

After further inspecting, I found 2 more similar plugs, B and D. They were connected. B comes from the aircon compressor, D toward the firewall. A and C come from various parts of the loom.

Now plug B was somewhat stretched, so I assumed that plugs A and B were meant to be together, and C and D were. I hooked them all up and the car ran well- except for no tacho and aircon doesn't work....

I then put the car back the way it was, B and D connected, A and C connected. Everything worked bar Tacho. When plug C is disconnected, the tacho works. When it is connected, it doesn't....

So what the hell does all this mean? Should I just have two plugs sitting there doing nothing? What are they for?

And car seems to be running better now. Added fuel system cleaner to tank. I just need it to start until Tuesday, when it goes in for overhaul.

Any further tips/ ideas on the wiring plugs is greatly appreciated, thanks guys. Kudos and Rep all round.
Cheers,
Ryley

[BlackSupra]

Are you sure?
I've never heard that on any Toyota I've had.

Its how the 5me works in an MA61 at least.

[CrUZida]

Wierd.
I'm positive my 5MGE never did it.
Sure, the flap keeps the pump on, but there was no priming.

[thechuckster]

Wierd.
I'm positive my 5MGE never did it.
Sure, the flap keeps the pump on, but there was no priming.

sorry - i might be confusing that with the megasquirt - it does a priming squirt unless ECU is in floodclear mode.

has been a while, but i think that on the 5ME in th MA61, unless you have airflow thru the AFM, you have no fuel pump.

Hence, easy prank to play on 5ME owners, partly disconnect the AFM plug - hours of irritation wondering why the fuck the the damn thing wont start.

[CrUZida]

sorry - i might be confusing that with the megasquirt - it does a priming squirt unless ECU is in floodclear mode.

has been a while, but i think that on the 5ME in th MA61, unless you have airflow thru the AFM, you have no fuel pump.

Very well could be.
My Microtech primes, as does all the Nissan's I've worked on, and Holdens, but don't recall any Toyota doing it.