got spark and fuel but no bang

[frenchi]

1989 18i auto swaped over to25i prefacelift new loom new ecu branched relay on fuel relay pump then works,all dash lights are on turns over nice swaped black and yellow wire behind glove box to get it to tun over,the only thing i can think that is different loom came with sencer attatched but i still have origanel that came with engine could that control fuel and spark loss,,,,help please pulling hair out not a lot left

update from early ask,pulled relays in engine bay branched over so got fuel to rail got spark to plugs but no bang new ecu this is an 1989 18i auto changed over to 25i manuel preface 86 new loom it seems like injecters arnt firing ,,,,,,,,,,,help

[Grrrmachine]

I'd love to help, but I really am struggling to work out what you've typed there. You really need some full stops because I have no clue what you've done so far.

What do you mean "branched over"? What have you done to get the fuel supply working?

What ECU are you using for the engine?

What mods have you done to the loom to connect the C101 plugs together, if any?

Who the hell is Manuel?

EDIT: I've also edited your post to join your two threads together, and deleted the old one. You don't need two threads running.

[Grrrmachine]

If you PM me, others can't join in to offer their advice. So here it is:

i think its down to the relay five pins, two 87s one 30 if you branch all three together, it now runs ,does this mean the relay is no good or is there more problems,what is a 101 plug,the story, bought a very clean 18i,bought a 25i engine but when arrived loom was cut so ,,new loom,,, no ecu when it did arrive broke ,,new ecu,, all year related the engine is 86 preface high compresion

To start - the C101 is how you connect the engine loom to the car loom; the big plug against the bulkhead. I also think you're confusing "branch" with "bridge", so that tells me what you're doing with the relays.

What sounds most likely is that your Crank Position Sensor isn't working, or isn't sending its signal to the ECU. Now on these really early engines the CPS was on the gearbox, with a second sensor reading a pulse from the flywheel. On newer systems its on the front of the block picking up a trigger from the crank wheel. If you've mixed and matched your looms and ECUs then you'll have the wrong ECU for the sensor arrangement, or a lack of sensors altogether. Have a look at the pictures on this page to see what I mean:

http://www.e30zone.net/e30zonewiki/inde ... ion_Sensor

Can you tell us what the number is on top of the ECU?

[frenchi]

no i have not mixed nothing up , i have sorsed all on e 30 matched the loom it has two gear box sencers and one on the front pully not like picture, small black plastic this was all on loom, just pluged strait in, it runs fine if relay is pulled and the pin numbers 30 and the two 87s are conected ,the ecu that came with engine was coroded so matched numbers 073 ,what shall i do about relay ,is it buy a new one ,or do you think it is more then the relay,i only found out about how to find this problem on the e30 trouble shooting

[Grrrmachine]

Oh, it runs with the relay bridged? It's probably a duff relay then!

[frenchi]

can i use any of the five pin relays tofix this or do they have to match by number,thanks