Spark+Fuel but no start--S50

[Steven]

So what happens if you unplug the MAF?

Uhh I can see tomorrow, but how would that effect the fuel rate?

[techno550]

The MAF is the first input in the chain of fueling. It is the basis for all of the fuel calculations.
A bad MAF can cause a lot of problems. A big vacuum leak can as well. Usually with a big vacuum leak, it will start/catch fine, and die immediately.

[Steven]

The MAF is the first input in the chain of fueling. It is the basis for all of the fuel calculations.
A bad MAF can cause a lot of problems. A big vacuum leak can as well. Usually with a big vacuum leak, it will start/catch fine, and die immediately.

Hmmm how should I test maf and a vacuum leak?

[Wanganstyle]

You have an electrical fuck up.

If removing the fuel pump relay allows the car to start; its causing a short. The fuel pump relay should control the power to fuel pump; with it removed there should be no power to fuel pump.


If unplugging the #1 coil pack makes the car start then you have a short related to #1 coil.

Do you own a multimeter? Time to buy one if you wanna prevent an electrical fire in your car.

Unplug afm to see if its bad; if the car will idle better with afm unplugged you know the afm is culprit.

Have you checked the dme for codes? It will usually tell you something useful

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[Steven]

You have an electrical fuck up.

If removing the fuel pump relay allows the car to start; its causing a short. The fuel pump relay should control the power to fuel pump; with it removed there should be no power to fuel pump.


If unplugging the #1 coil pack makes the car start then you have a short related to #1 coil.

Do you own a multimeter? Time to buy one if you wanna prevent an electrical fire in your car.

Unplug afm to see if its bad; if the car will idle better with afm unplugged you know the afm is culprit.

Have you checked the dme for codes? It will usually tell you something useful

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Okay. Where do I test for a short with the relay?
Coil 1 can be plugged in and it start.
Yes I own one.
I will test the amd when I get home.
I haven't tested the DME for codes but I'll try and get my hands on a code reader

[Wanganstyle]

Okay. Where do I test for a short with the relay?
Coil 1 can be plugged in and it start.
Yes I own one.
I will test the amd when I get home.
I haven't tested the DME for codes but I'll try and get my hands on a code reader

Get the diagram of the 3 main relays.
Check if u got power at power wires and ground at ground wires. If u got power at a ground you = have a short.

Clues:

power will connect to injectors x6
Also to coil packs x6
Ground will also.

If you got a large wire from harness to body in the wrong place you will create a massive short.

I.e. connection of ground to power terminus and make own giant short


If you have a multimeter why are you too lazy to use it? You could a been driving a week ago instead of looking at a dead car

[Vivek]

Okay. Where do I test for a short with the relay?
Coil 1 can be plugged in and it start.
Yes I own one.
I will test the amd when I get home.
I haven't tested the DME for codes but I'll try and get my hands on a code reader

Does 413 stomp test?

[Steven]

Get the diagram of the 3 main relays.
Check if u got power at power wires and ground at ground wires. If u got power at a ground you = have a short.

Clues:

power will connect to injectors x6
Also to coil packs x6
Ground will also.

If you got a large wire from harness to body in the wrong place you will create a massive short.

I.e. connection of ground to power terminus and make own giant short


If you have a multimeter why are you too lazy to use it? You could a been driving a week ago instead of looking at a dead car

I've used the multimeter to check all grounds and power. I've already checked power and ground wires going to the fuel relay... They're all correct...

[Wanganstyle]

I've used the multimeter to check all grounds and power. I've already checked power and ground wires going to the fuel relay... They're all correct...

Some thing else is wrong then; u made a short and hid it from yourself.

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[e30austin]

I know this is crazy talk, but why don't you go get a good known OBD1 TU non EWS harness and swap it in?

[NickL]

Try a different CPS. The one on an e36 I had ohmed out correctly on two of the three pins but incorrectly on two different ones. Swapped it and it fired right up.

Car would intermittently fire and die until I swapped it.

[Steven]

Shit. Well here's what I'm going to do. I'm going to try a different DME in it, if that doesn't work, CPS, if that doesn't work I'll try a new harness.

[techno550]

Results of stomp test? unplugged MAF test?
done as stomp test, then unplugged MAF test, then stomp test again will validate that the stomp test is giving out plausible fault flashes (i.e. that you are reading/counting them correctly.)

[Steven]

Results of stomp test? unplugged MAF test?
done as stomp test, then unplugged MAF test, then stomp test again will validate that the stomp test is giving out plausible fault flashes (i.e. that you are reading/counting them correctly.)

I'll do that today. I didn't touch the engine yesterday, I was putting the fenders and front end back on yesterday

[Steven]

Still need to do those tests but, Still having the problem of too much fuel going into the cylinders... I think. Well it starts up with the fuel pump relay out but dies after a couple seconds idle because no fuel. Tries to start with it in but dies making me believe it's kinda flooding it?