No start, many parts replaced. Need help!

[M3 Cereal]

Car is not getting fuel,
there is no power at the fuel pump
Motronic wont throw codes (stomp test not working)
car cranks no start
Car will run with ether (carb cleaner)
all fuses fine

Things i have replaced,
new crank shaft position sensor
New fuel pump
new Fuel pump relay
New main relay
new Motronic
Fuse 11

getting sick of throwing money into this car,
does anyone have any ideas.
really have no clue why the motronic wont throw codes when it would a few weeks ago.

any suggestions will help. need my car running!
-Evan

[603Racing]

You say no power at fuel pump... is this while cranking? If so, I would start by checking the wiring at the ECU. Testing for coninuity and power for the fuel relay wiring, fuel pump power wire, CPS wiring, main relay wiring.

Do you have power at fuse 11?

Does the main relay click when you turn the car on?

If you put 12v directly to the fuel pump does it pressurize the system?

There are some good no start threads on this site, probably a few with the exact same issue you're seeing.

[jlevie]

The stomp test not working could be a bad TPS.

Is there spark when cranking? Is there power to the fuel pump relay (coil & contacts) when the ignition is witched on? Does the fuel pump relay close when cranking?

[M3 Cereal]

I will be checking for sparks and volts tonight everywhere when I get home.
Will replace TPS if this is why the motronic is not throwing codes.
Would anything else cause this.

Car cranks. No power at fuel pump checked it.
I'm going to make a jumper for the pump and see if I can start it this way.

I understand there are a lot of no start threads here and everywhere but i have read close to 50 of them and getting tired of replacing parts and hearing peoples remarks that no nothing about the issue. Which is why I made my own thread. If anyone has a link to a Very helpful no start thread then lay it on me.

Fuel pump gets zero power no matter what key position.

Will check back tonight with electrical findings.
Bently manual does not explain what would cause the motronic to not throw codes.

[jlevie]

The pump only runs when the DME tells it to. For that to happen the DME has to be running and getting timing data from the CPS. In addition to a bad TPS, if the DME isn't running the stomp test won't work.

One reason that there are so many, somewhat confusing, no start threads is that most folks toss parts at the problem rather than doing proper diagnosis and fixing what is actually wrong. The "throw parts at the problem while hoping for a favorable outcome" will eventually work, but it will usually be more expensive.

[M3 Cereal]

so after running through a series of diagnostics i found that my ICV is making a humming sound and has a slight vibration like its not grounded,
before i go ahead and order a new one $150 =[ is there anyway i can fix this one.
It only makes the noise when i have the key on the on position and the sensor is plugged in.


can i soak this part or take it apart and how do i go about doing this (cleaning)

[jlevie]

so after running through a series of diagnostics i found that my ICV is making a humming sound and has a slight vibration like its not grounded,
before i go ahead and order a new one $150 =[ is there anyway i can fix this one.
It only makes the noise when i have the key on the on position and the sensor is plugged in.

That is normal and probably means that the ICV is okay. A bad ICV would result in an unstable idle, but it won't prevent the engine from starting or running.

Is there spark when cranking? Does the fuel pump get power when cranking?

[M3 Cereal]

zero power to fuel pump when cranking.
going to go jump my fuel pump now and see if he will start

[mr ilia]

I had similar symptoms just few days back. Spend a day fighting it.
Crank, but no start.
No power at the pump, fuel relay is good, fuse 11 no power and cps was good.

I jumped fuel pump off battery and it worked, then i jumped fuel pump of the relay by setting up independent wire and the pump started.
At the end i discovered the whole issue was contact at the puel pump and the plug that goes to it. To test my theory i left ignition in on position and fiddled with the plug and the pump started working.....and the car started and no issues so far.

Keep in mind, up until the final outcome i never had power at fuse 11 and power at the fuel pump. After fixing the contact i started getting power at the fuse and at the pump.....
I'm not an electric guru, so i can't really tell you anything else, but i guess this was engineered tat way.

[M3 Cereal]

update.
checked power everywhere
turned out the fuel pump had power but the new replacement was bad, (sent back)
the problem was the TPS which indeed was no codes being thrown

replaced the oled fuel pump and new TPS
Car started with first crank
Thanks all
-Evan

[mr ilia]

Кул беанс.