OK so 402 ecu should = No EWS start problems?

[Elfoure]

I am useing the 402 ECU on my swap out. Still have the "No spark-No fuel pump-no start thing" happening. Tested for power at coil connecter 15a, good. Jumpered ,what 85 and 30 on fuel pump relay, and fuel pump ran. and ECU is grounded.

Still need to check crank position sensor.

Have traced through wireing several times. Fixed a few miss placed wires. Starter Fine , Cranks nice , Baterry good nice grounding.

SO to clearify 402 ECU. You dont need to change chip accept for preformance?

[mentaleeill]

no ews on a 402. could you of swapped the i.c.v plug and crank position plug by accident? you do have a non vanos engine and harness right?

[matt]

Definitely no EWS. Crank sensor would be my first suspect.

[Elfoure]

ok, I will check crank sensor tuesday night. I am very suspicous of the ECU though think I may have fried it when the wires where wrong. I may pick up a 403 ECU just in case. Read alot of other thread of guys in the same position that I am in the dreaded "NO Start" or "NO Spark" thread. And seams that if isnt EWS than usually ends up bad ECU.

Thanks For helpin Newbie

[Elfoure]

Power to injecters good. Checked crank sensor puttin out 529 oHMS should by what 1285 Ohms for M50 according to book while M20 is 540 so Crank sensor is no Good atleast for my M50. Still Picked up another ECU but got the 403 and will get ne crank sensor.

[gregslow318i]

any up dates? I am also having the same problem but according to my research the cps should only be around 540 not 1285 that is for the cam sensor?

[Elfoure]

yeah greg i checked book again and again that drove me crazy. Book is wrong checked a good M50 crank sensor was about 540. So wasnt that. During the week i got the 403 ecu looked damn near new, came from a crash so car was running. Then i looked at the back and noticed tabs where brocken, figured either ecu had been worked on or someone went in to fetch pref chip before car got scrapped, so i opened it up cause i was litle worried. Turned out to be Christmas in August. Got 403 ECU with Dinan Perf Chip still in it all for @$70 shipped.

Well I did more trouble shouting, had forgotten to plug in oil sense so plugged that. Checked voltage at Old ECU and gound was ok, and not over heating. So i putt in newer 403 still no start.

And so here is the true Newbie mistake! Early on I was hooking up the gas hoses supply and return and the previous owner of the mechanic shop was there to see my friend that now owns the shop. He told me which hose to put where and since he used to work on a number of bimmers and this is my first i listened. Not puting blame on him I was a dumb ass for not traceing it down myself especially before now. THEY WERE REVERSED!!!!!! After switching them she started right up very nice end to that frustraighting chase.

Greg im sure this isnt giving you insight into your situation, but i have learned alot from this forum. And my friend at the shop helped my learn a little better how to use electrical test meter. Checked sensor for resistance, checked main relay today by the book. Jumpered fuel pump relay to check fuel pump. I had put a ground to posative that comes from harness(Dumb But happens).

Tell me your set up and maybe cause im just now going through it fresh i can offer some help, but alot of people around here that have more experience .

[gregslow318i]

k I am using a m50nv from a 92 325i with a e36 nv harness and a red lable 403 I have power to the dme power to the fuel pump and power to the o2 relay. it will turn and crank like no ones problem but will not start but on closer observation if I have the cam and crank sensors switched it will back fire in to the intake mani but I have checked cam trimming ( have the tools now) but will not start. I am using the adapter from my m52 car that I know works ( drive it every day almost) so I am kinda at a loses I have swiched cps back and forth from the m52 and the m50 and they both work fine same with the cam sensor between my m42 car. I have gone through 2 harnness think one was bad same with the dme. coils are good ( shocked the sh*t out of my self testing them) I have good comp accros the board ( from 170-195). so what is next?

[Elfoure]

The fact that it backfires says there is spark and fuel, and getting a signal from sensor just not proper resistance when you switch them to test,in opposite positions. Did you check Crank sensor for resistance with a meter, as i understand car will start if cam sensor is faulty but not if crank sensor is faulty. Use OHM setting on meter check 1 and 2 pin resistance should be around 540, you know that though. You have a harness adapter You said right , i did my own mess.

[88E30M50]

yeah greg i checked book again and again that drove me crazy. Book is wrong checked a good M50 crank sensor was about 540. So wasnt that. During the week i got the 403 ecu looked damn near new, came from a crash so car was running. Then i looked at the back and noticed tabs where brocken, figured either ecu had been worked on or someone went in to fetch pref chip before car got scrapped, so i opened it up cause i was litle worried. Turned out to be Christmas in August. Got 403 ECU with Dinan Perf Chip still in it all for @$70 shipped.

Well I did more trouble shouting, had forgotten to plug in oil sense so plugged that. Checked voltage at Old ECU and gound was ok, and not over heating. So i putt in newer 403 still no start.

And so here is the true Newbie mistake! Early on I was hooking up the gas hoses supply and return and the previous owner of the mechanic shop was there to see my friend that now owns the shop. He told me which hose to put where and since he used to work on a number of bimmers and this is my first i listened. Not puting blame on him I was a dumb ass for not traceing it down myself especially before now. THEY WERE REVERSED!!!!!! After switching them she started right up very nice end to that frustraighting chase.

Greg im sure this isnt giving you insight into your situation, but i have learned alot from this forum. And my friend at the shop helped my learn a little better how to use electrical test meter. Checked sensor for resistance, checked main relay today by the book. Jumpered fuel pump relay to check fuel pump. I had put a ground to posative that comes from harness(Dumb But happens).

Tell me your set up and maybe cause im just now going through it fresh i can offer some help, but alot of people around here that have more experience .

Good to hear it's running. I'm still at the no-start end of the problem myself and was thinking CPS, but now am thinking I need to recheck the grounds, connections and fuel. I think I have the fuel lines right though, as I get pressure when cranking. I just get some sputtering and an occasional backfire. I'm using a green 405, with the D'Sylva chip. I'll recheck the grounds and report back on what I see with mine.

[gregslow318i]

The fact that it backfires says there is spark and fuel, and getting a signal from sensor just not proper resistance when you switch them to test,in opposite positions. Did you check Crank sensor for resistance with a meter, as i understand car will start if cam sensor is faulty but not if crank sensor is faulty. Use OHM setting on meter check 1 and 2 pin resistance should be around 540, you know that though. You have a harness adapter You said right , i did my own mess.

yeah I have check resistance on it and it comes back with tolerance yeah I know my adapter works (came off my other swap car) I am stuck

[88E30M50]

yeah I have check resistance on it and it comes back with tolerance yeah I know my adapter works (came off my other swap car) I am stuck

Did you check the cam sensor? That's what I'm focusing on with my issue right now. Per members on the Yahoo E30Twincam group, the crank position sensor indicates crank position, but the cam sensor times spark. I'm going to give swapping the cam sensor a shot after work tonight. I ran out at lunch a bit ago and picked up a cam sensor from a junk yard car for $5. I'll let you know if this makes a difference in my car.

[gregslow318i]

Did you check the cam sensor? That's what I'm focusing on with my issue right now. Per members on the Yahoo E30Twincam group, the crank position sensor indicates crank position, but the cam sensor times spark. I'm going to give swapping the cam sensor a shot after work tonight. I ran out at lunch a bit ago and picked up a cam sensor from a junk yard car for $5. I'll let you know if this makes a difference in my car.

do you have a m50 nv front crank wheel turns out they are different between a m50nv and a m50

[Elfoure]

Mine is the M50nv , but myself im not knowladgeable about the m50 Vanos. how bout you 88

[88E30M50]

Mine is the M50nv , but myself im not knowladgeable about the m50 Vanos. how bout you 88

My front crank wheel is nv.