86 240 car car was running stopped to put new o2 sensor on car would not re-start.. tow home checked volts to the injectors none i installed this into my 84 alfa romeo spider worked great for a year, then this....before this happened, i had all the wires hooked up ran fine.. the big yellow/red wire to the 4 plug i never installed. but it ran then2 days ago stopped.. hooked uo yellow/red wire to 12 volt key on only,, now the injectors click on and off without the motor running, cannot start..any ideas here..my cell is 916-412-9052 i am giving this as my pc is in the shop now, please help..i need my car to run thank you

 

the yellow red wire from the 4 plug. is this 12 volt key on?

 

from what I can see on the wire schematics when the yellow red wire is hot I should get 12volts to the +on the injections yes?and I should not hear the injections clicking on off with the motor not running

 

'the 4 plug' ??

what year, model Volvo is this, and what '4 plug' are you referring to? Ignition On is usually blue-yellow or blue wire or red-black, but it varies by year and model.

 

86 ecu 280 000 544 86 volvo 240 question

 

ok, looks like on the LH 2.2 240's (up through 88), the yellow-red wiring is the the fuel pump and injector power, which comes from the fuel pump relay pin 87/2 and should only be powered when the engine is turning over. The power goes into the fuel pump relay pin 30 from a heavy red wire which comes directly from the 25A inline fuse near the battery.

Ignition switch pin 15 (on in start and run) is a red-black wire that goes to ECU pin 18 and fuel pump relay pin 85. The ECU tells the fuel pump relay to switch on via a blue-green wire from ECU pin 17 to relay pin 86/2.

I still don't know what you mean by '4-plug'.

 

my 4plug is as follows white. red. red/black large yellow/red my cell 916 412 9052 hard to type on cell phone to slow

 

if I UN clip.the injection clip ok get 12 volts to each pin. ecu unplugged is this right should only 1side on the harness side have,12-volts

 

4plug just upstream of the ecu main plug 4 wires come out of the " 4- plug

 

... AHH, I missed that (its not shown on all years of LH2.2 240's drawings)... There is a 4 pin plug shown near the ECU, with black-red, yellow-red, red, and white-black wires. It appears this yellow-red wire is the power to the fuel pumps themselves, the black-red wire is control power from the ignition switch pin 15, and the red wire is unswitched power from the 25A engine fuse going to the fuel pump relay pin 30.

the injectors themselves have two wires, power comes into them from the fuel pump relay on yellow-red wires, and the green-white wires go to the ECU pin 13, which pulses to ground to fire the injectors. as far as I can tell, the white-black, which comes from ECU pin 15, goes nowhere.

again, yellow-red should ONLY have power when the engine is actually turning over. about 1 second later, the yellow-red power is killed via the fuel pump relay controlled by the ECU. The ECU determines the engine is turning over via a signal from the ICU (ICU pin 8 to ECU pin 1 via a grey wire). The ICU in turn sees the engine is turning over via pulses from the hall sensor in the distributor.

 

no hall sensor on my car. the car was running infill a few days ago. I was told that this can be used as a st and alone to system some bmw 2002 owners use this system

 

I have this system on my alfa Romeo spider I use 104/8 from ecu 1 to coil for rrunning signal

 

um, all LH 2.2 US model cars have Chrysler Ignition Control Units, and a hall sensor in the distributor for their timing source. Breaker points went out in the 1970s. the hall sensor has a 3-wire connector on the side of the distributor, green (+ power), yellow (signal) and black (ground), all three of these are connected directly to the ICU. Later LH 2.4 cars (1989+) got rid of the hall sensor and use a crankshaft position sensor in its place.

 

wait, I just read that again, ok, well, now, if this is an engine transplant, then its a whole different can of worms, and I dunno that anyone can help you via online. my wiring diagrams are useless.

 

go transplant removed stock l jet installed Lh jet into my 84 Alfa Romeo spider

 

but before, bmw 2002 owners have installed this system

 

104/8 is no 1 pin on the ecu this goes to the neg coil. 104/7 ignition control unit. 222 -to idle speed adjustment the last two are from the throttle switch. big black thing on the throttle body. any ideas?

 

got you stumped?

 

yeah, I'm stumped. you took a system from one car, and put it on a completely different engine, I've never ever worked on an alfa motor, never mind seen your specific hack, and you expect someone to be able to help?

I already explained how the wiring should be with respect to the fuel pump relay, and how it powers the injectors (yellow-red). did you have another specific question? did I leave details out?

 

yeah, I'm stumped. I haven't seen this custom bastardized setup, I've already explained how yellow-red should be powered from the fuel pump relay, I'm stumped that you actually think someone who's got NO idea what you've done can possibly have a clue how to fix it.