No spark, no fuel, no nothin

[AbsorbantNut]

Well, as the title says Im getting no spark or fuel. The car will turn over and crank, but it wont start. I checked the main relay with one from a working car, and it wasnt that. I checked the fuel pump, but it wasnt that. I just got a new CPS, but when I installed it, it still didnt fix the problem.

But there is a sensor on the bottom of the block, exhaust side, I havent checked, but today I noticed that one of the two wires going to it was cut in half and dangling.

What could it be??

[BMWZ318is]

im having the same issue have you figured it out yet?

[jlevie]

That sounds like you are talking about the oil pressure switch or the O2 sensor. Neither of which has any affect on the lack of spark or fuel. No spark and no fuel when cranking will be:

No timing data to the DME
No power to the DME
No START signal to the DME
Bad DME

[AbsorbantNut]

That sounds like you are talking about the oil pressure switch or the O2 sensor. Neither of which has any affect on the lack of spark or fuel. No spark and no fuel when cranking will be:

No timing data to the DME
No power to the DME
No START signal to the DME
Bad DME

its the oil idiot light sensor. Ubernasty just posted a thread about his dripping oil and the pic is of the same exact thing thats broken on mine.

So, basically I need to get a DME to see if its that? I have one in my e30 vert that works(I know because I drive it), but the vert is a 90 and has a 525 DME, which is a late model DME. The 87 has a 153 DME, the early model kind on the other hand. Are they interchangeable? because I know the early and late model harnesses are different, does this affect the DME?

Basically, can I swap a 525 DME with a 153 DME?

[AbsorbantNut]

OK, well it isnt the ECU anymore, I ruled that out when I swapped ECUs and there was no change.

But the new CPS did solve the spark problem. Now I just need to figure out why Im getting no power to the fuel pump

WHAT IS GOING ON!!!:hitler:

[pharow]

did you check the fuse and relay to the fuel pump?

[AbsorbantNut]

did you check the fuse and relay to the fuel pump?

yes

[jlevie]

If power is presented to the fuel pump when the engine is cranking, either the pump or FPR becomes the prime suspects. If rail fuel pressure (as measured by a gauge) is normal and the car is a 9/87 or later 325, C191 (below the intake manifold) is a suspect.

[AbsorbantNut]

If power is presented to the fuel pump when the engine is cranking, either the pump or FPR becomes the prime suspects. If rail fuel pressure (as measured by a gauge) is normal and the car is a 9/87 or later 325, C191 (below the intake manifold) is a suspect.

There is no power. I already checked the intank pump. Ill check the external pump later, but I replaced it with a tested used one a few months ago. Ill pull the line going to it from the internal pump and then crank it over, but this isnt really the problem.

The real problem is I am getting no power to the fuel pump. No power to fuse 11, and no power to the check spots on the fuel pump.

[RedTRex]

Well...........if you are not getting power to fuse 11, then the fuel pump relay is not closing. So it's either fuel pump relay or Main relay or wiring.

[EDIRTYBASTARD]

Im having the same exact problem with my 91 318is, Both the crank sensor and cam sensor have been replaced, along with the fuel pump and fuel filter. I ripped out the aftermarket alarm it had that was tied into the ignition wire and branched to splice with many other wires which i thought would solve the problem. (it didnt -.-) no power to the fuel pump when the ignition switch is turned, doesnt prime at all. want to replace all fuses with updated fuses and all relays. i also want to follow the fuel pump wires. but lets keep this thread alive!

[StereoInstaller1]

Keep in mind how that main relay works: it is a single pole, single throw relay, but with 2 NO contacts.

When the key is on AND the DME has power, the DME will turn on the main relay.

When it turns on the main relay (both 87 pins go to 12V) by sending a ground to pin 85, the fuel pump relay will go to 12V also, as long as the DME sees CPS signal it should fire.

A quick test is to jumper from 30 to BOTH 87's on the main relay. If the car runs, you have a bad main relay. BTW: it will not shut down until you pull the jumper.

GL fellas.

Luke

[RedTRex]

Interesting, I never realized it did that.......DME is looking for power at pin 18 so it can power main relay solenoid from pin 36 and get more power to itself through the main relay and into pin 37

[AbsorbantNut]

Well I didnt have power to the fuel pump rellay, so I traced it to the plastic positive terminal box on the passsenger side of the engine compartment. I later read that the inline fuse in the positive battery cable can sometimes short or burn out, causing no power to the fuel pump. It is located in the trunk, if thats where your battery is, about a foot from the battery in the positive terminal cable. It is connected to the little wire running alongside the big one.

When I checked the fuse out it looked ok, but was covered in a white film/dry paste. I poked it and it basically collapsed. So I spliced in a fuse, just like you'd find in the fuse box, into it, and tried to start the car. It ended up solving my power problem to the fuel pump. You can read my other threads about it and how suspenseful it was.

So definitly rule out the inline positive power fuse before you go replacing anything else

[StereoInstaller1]

Interesting, I never realized it did that.......DME is looking for power at pin 18 so it can power main relay solenoid from pin 36 and get more power to itself through the main relay and into pin 37

Yeah...clear as mud, huh?

Fucking WONDERFUL to see we have another member here who can read a goddamn schematic!

Please tell me you aren't an EE or some retarded crap...