EECV help? - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars

mongrelEB · 07-29-2003, 05:15

Just wondering if any of the people out there who know about computers could offer me some suggestions/explanations?
Ever since I did the EECV conversion the car has been seriously overfueling - to the tune of about 5km/L.
I wasn't too worried, figuring it was just a sensor.
I have since replaced TPS, MAP, and O2 sensors with no effect. I have checked the regulator, that's OK, am basically stumped now. I will try testing the coolant sensor tomorrow but I seriously doubt that would cause that sort of overfueling. Basically I am down to computer faults, or wiring faults.
Now I did not touch any of the sensor wiring when I did the job, so I don't think it's that, but if all else fails I'll have to pull it out of the car and go over it again.
About the only lead I have left to try is: Can anybody tell me what the black/white wire is for which connects the TPS, MAP, O2, and P/S? Various different books tell me it's a common power, common earth, or data bus. Neither of these really make sense to me due to conflicting apparent functions on various plugs.
Haven't been able to get a reading off it with the analogue voltmeter, dunno if I should though so this is not much use to me.....

Any ideas?
Cheers
Alex

TopGhia · 07-30-2003, 14:19

It looks like a data line - connects to pin 91 on the EEC (PCM) module. That's all I know.

cheers

mongrelEB · 07-30-2003, 16:18

Yeh me too....I can't get a straight answer out of the factory manual either... :\

Oh well fixed the overfueling....had a brainwave last night and took the return hose off at the pump to make sure it was running.

It was.

But putting it back on, I accidentally happened to look down the end.....the skin inside the hose had come away from the wall, last time we put the pump in it draped over the insert and blocked it off!
So I'm stoked!
Only now it's revealed a timing problem, too far advanced, so I guess I'll check the balancer hasn't slipped and the K/S is working.
This is why I love cars...NOT!
Oh well thanks for the help TopGhia.

NZ · 08-02-2003, 16:54

How'd you get on?

mongrelEB · 08-03-2003, 03:59

Still shithouse, idles OK but the timing seems to be too far forwards - pings like a bitch and no power down low - got dragged off by an AUTO for cryin out loud! :)
This is starting to really annoy me....am thinking about changing to full AU loom and making the dash fit it.
Just a repeat on the black/white wire - anybody at all have any ideas at all? Seems as if it must be a power wire but the Ford manual tells me it's a data bus....:z

IAN SCHMIDT · 08-03-2003, 13:11

The black white wire is the signal return wire to the computer from the sensors this is needed for correct sensor readings as the computor sends a know voltage accros most of the sensors and reads difference in resistance to know what is going on.
This wire is bascilly the voltage return wire.

TopGhia · 08-03-2003, 13:32

re the timing. Has that thing got a knock sensor?

I just re-read your post K/S = knock sensor.

What would happen if it were disconnected?

mongrelEB · 08-03-2003, 18:18

Well the timing would be too far forwards :/
I am going back to Ralph today to replace K/S and crank sensor, then I will have replaced every sensor on the bloody motor!

grrr....

VH-PBC · 08-03-2003, 18:29

Hope you fix it up because I'd bet that it's draining more than just your fuel tank!

mongrelEB · 08-04-2003, 03:34

Aye.

Well went to Ralph, replaced K/S, nothing. After an hour of swearing and head-scratching, found another computer on a shelf in the back of the shop and tried it.
It seems to have fixed my timing issues, but the thing's still overfueling, my guess is the regulator may be stuffed since I've replaced everything else......:/

Anybody in Perth have a fuel pressure gauge they'd be willing to share? :)

Gahhh this shits me.