Larry Velk

I improperly jumped another thread on my '86.0 no start (it was '85 no-start). In any case, my '86.0 5sp failed to start in my own little shop - saving a tow! After finally somewhat figuring out the WSM wiring diag. and testing and probing - spent literally hours seaching threads, I have no power at the trigger terminal for the EZF(K) relay. There is power at B11, so the alarm circuit is not passing through to the 86 terminal of the relay. I have the alarm bypassed - just did this based upon a search yesterday, but I haven't confirmed the jumper has continuity as it is an old one made for Ford EFI jumps. In any case I need to confirm this relay should have 12 v, ignition on, alarm disabled OR working properly - in other words, does it need to crank before 12v goes to it or should it be live with ignition on. I know I should go over the alarm disable info - but it was a bit muddled because the system changed over the years and the experts are more familiar with years other than USA '86.0's. I have 85 jumped to 15 on the plug that goes to the alarm module with no other jumpers on the CE. I was so happy to find something that I haven't properly checked my alarm bypass as yet, but though it best to double check this info first.
OK, alarm was not bypassed properly - I used colors this time instead of numbers - black with red stripe jumped to yellow - now have power at 86 terminal of EZF(K) slot in CE.
Also an error - the 86 rterminal of the LH relay is grounded and the 85 terminal goes to the 21 pin on the LH connector.
I have continuity on the wires from the 2 control units (LH and EZF(K)) and the various terminals on the CE panel. I still need to check the O2 sensor circuit, the MAF and injector circuits. The ignition switch and the main power are all feeding the panel. Believe it or not I'm having trouble buying relays locally. While all the relays bench test OK, I'll put new ones in.

Alan

Larry - got you PM on this - have taken a look

Here is the other thread referenced: https://rennlist.com/forums/showthre...eferrerid=6055

The alarm bridging noted here above - Yellow to Black/Red is correct - though its terminals 87 & 15 on the alarm relay.

You can also link terminals F25 & B23 on the central electric panel - usually easier to do.

F25 = Plug labeled F and pin in the 2nd row (the right hand side - 1 = LHS) 5th pin up (the top one)

Seems you now have power to the EZF relay it should in fact be to the 86 terminal with 85 grounded... you sure?

What are the remaining sypmtoms of your failure - you mention 'cranking' does the starter turn over?

Does the car try to start at all?

You need to first check for spark (safely) on each bank.

To get spark the EZF relay must be on... check Pin EZF 87 (also on CE panel pin W14).

Without spark the injectors will not fire - & the fuel pump will not run until the engine is rotating and you have spark.

Alan

Larry Velk

Alan, thanks to you, mrmerlin, doc for your replies and previous posts on this topic. The car now runs. I checked all as noted - I did not attemp to start it during the process and in fact "fixed" nothing except jumping the alarm. I had no spark and probably no fuel as the plug I pulled was dry and didn't smell. The sad thing of course, is I won't trust it again.
There is a possible reason for this episode. My son now uses my XR4ti so I took the 928 to the food store. The auto hatch lock stopped working and the struts are shot so I needed to open the hatch with the key numerous times unloading a teenager's load of food - I think I set the alarm by mistake as it was distracting and hard to get the thing open with one arm full of six packs and chips. When i got in the car no horn sounded nor was there any indication I NOTICED that the alarm was set. It is more than possible that the car didn't start due to the alarm. I noted your post about owners not knowing how to use the thing - count me in - I don't lock my cars and have never set an alarm intetionally in my life.
BTW, I recall you saying the alarm cannot engage with the car already running - so it cannot cause random dying - is this true even for internal module failures?

Alan

On my car I have a keyswitch (under the sill cover) that lets me test the alarm - instead of Honk Honk Honk - I just have an led that flashes - this lets me test the alarm conveniently.

On some years it is possible to set the alarm with the drivers door open - but you have to turn the key anti-clockwise in the hatch lock - certainly possible to do accidentally when removing the keys.

Glad its running now - with the alarm bypassed you should be OK.

Alan

Larry Velk

I know for sure I turned the key anti-clockwise (I used this term when I taught physics just to make the students think I was a Limey and therefore smarter) when I was doing the grocery thing. This was all at home in the garage/shop - which wasn't clear in my post. In other words the car got home from the store, sat overnight after having the hatch key fooled with and then didn't start the next day. I hope that was it but I'm leery since I'm sure the horn wasn't blowing as I tried to start it. Since the circuits all look OK if it starts doing odd things I guess its time for a brain transplant and CPS.