Lucan 196 Report post Posted August 15, 2017 (edited) Looking for some advice on issues with my M30 swap: Rundown: M30B35 from a 199X 535i, G240 box, M3/S14 flywheel, M20 clutch and p/plate, M30 starter. ECU bosch 179 red label M30 engine loom. Issues currently present; 1) Fuel pump does not prime when key turned to ACC position? Google search does not help, pump should prime AFAIK. 2) ICV does not hum in ACC key position? Edited September 27, 2017 by Lucan Updat Quote Share this post Link to post Share on other sites
polley 916 Report post Posted August 15, 2017 I cant remember exactly how the unloader relay circuit is wired, but if youve wired the starter through it accidentally that would make a relay race and cause it to jump in and out rapidly. Quote Share this post Link to post Share on other sites
Lucan 196 Report post Posted August 15, 2017 That's possible, the green/black wire connecting to one of the starter spades does ground the unloader relay. May have that and ignition spades around the wrong way, hopefully a quick fix for one of the problems. Tested my CPS and appears to be fine. Will rule that out for now. Quote Share this post Link to post Share on other sites
Lucan 196 Report post Posted September 27, 2017 Updated 1st post. New battery sorted rapid starter, slow crank issue. So engine turns over well. Pump doesn't run while cranking or prime when first switched to ACC, does run when relay jumped. No spark at plugs. Tested 12v at coil Have swapped in known working main and pump relays Have tested and swapped CPS DME ??? Quote Share this post Link to post Share on other sites
polley 916 Report post Posted September 27, 2017 Dme either not getting powered up (main relay possibly?), or not getting crank signal (faulty cps or wired / plugged in wrong) . Or like you said sme is faulty Quote Share this post Link to post Share on other sites
