Car died

[kmofom]

Alright so I have to update my profile but the car is a 1991 Tsi. Car is basically stock for other than the fuel pump and fuel pressure regulator. I can start the pump and hear is run but when I go to turn the car on it just turns over and the pressure drops. It's not turning the pump on when I'm turning the car over. Any clues? And I have searched but my phones not loading all them

 

[SpawnedX]

...So let me get this straight? You hear the fuel pump running when you put the key in the ignition on setting but then it turns off when you are trying to start the car? How are you confirming this, what do you mean by the pressure drops do you an FPR or gauge reading fuel pressure as you try to crank the car?

 

[kmofom]

Last guy had it set up if you turn the key it starts the pump and then a push button to turn the motor over. And yes I do have a pressure Guage. It was working and the car died on me

 

[turbo24]

you pcm is not seeing the signal from the crank sensor if you check you prob dont have spark either check your crank sensor

 

[xyexz]

Might be a faulty MPI fuse relay...its actually two relays and one could be out resulting in your issue possibly.

 

[KRRZ350]

Reread his last post guys.

Is it possible to tell how it was wired stock & wire it back proper, or did he muck it up real bad?

 

[kmofom]

wiring has to be bad. I do have spark since i sprayed starting fluid and it wanted to start i know i have spark. Would having the fuel pump wired to the car alarm do these things? im planning on ripping it out since its acting up and randomly locking the doors and what not. Also after doing a few harder pulls it acts up, but if i give it awhile itll work fine again? I struggled to get off the highway and i could just hear the turbo spooling up

The wiring is legit a rats nest ill take some photos tomorrow its horrible in the driver side on the firewall. We tried seeing if the computer was throwing and codes today and it couldnt read it. Its not throwing any codes but the last guy was horrible at wiring. Also the computer has no leaking caps or burnt spots.

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[DSM1G90]

the ECU's momboard can look clean, but those drivers, the six slim black devices, could have blown open - doesn't take much to knock them out of commission ....

...and that board looks a bit discolored around the EPROM .. which isn't good either...

I shudder when I see a "spider's web" of a wire nest under the dash - that is asking for tonnage of problems right there in which I'm surprised that the car didn't catch on fire ...

-DSM

 

[turbo24]

yes the alarm can deffinatly cause the pump to go out that is ussually what they will tap into as the "safety feature" i would rip all that crap out and see what u get worse come to worse you could always just wire a fuel pupm relay in line to the pump to check and see if you have injector pulse un plug the injector and take a small peanut bulb (194 bulb) and point the little wires on it down and stick them into the inj. plug and while cranking it should flash indacating the the ecu driver is still good and firing off the inj

 

[kmofom]

The car will randomly work then act up like I'll push the clutch in and it will die and not even want to start it'll just turn over. Then randomly start working again. I do have another clean EPROM ecu that I found in the trunk all bubble wrapped up, can I just put that chip in to that one? I don't wanna really mess with all that and potentially make things worse. I'll be under the dash tomorrow sorting the wires a d cleaning it up. I couldn't learn much from the previous owner because his died and his brother just wanted to get rid of it. There's a mystery box under the dash by the door that has a key? And a box in the center console that blinks red that I still have to figure out about. My alarm system is a viper but when you open the doors and close them it has been randomly automatically locking my doors it just recently starting to do that.

 

[DSM1G90]

There's a mystery box under the dash by the door that has a key? And a box in the center console that blinks red that I still have to figure out about

Sounds like that's the whole or part of an alarm system and is sounds like it's full of bugs

 

[kmofom]

Alright so i went ahead and start looking at the wiring and I am horrified on why someone would do this...... When i looked at the car everything was great, but i didnt think to look up under the steering wheel. Theres gonna be a lot of pictures so hopefully someone can help me figure out what half of this #### is. Ive never seen something so bad.

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[DSM1G90]

...and the car can still run, or try to run? What I see here is tonnage of voltage drops all over the place due to all of that wiring and attached contraptions.

Wire and even heavy gauge wire, in a way, acts just like a big resistor and the more you add to a single DC circuit, the resistance value drastically increases through the circuit and you can say "Goodbye" to the required amperage to run that circuit and "HELLO" to a potential cabin fire.

One can tell that it wasn't put in professionally - someone was being desparate in finding a circuit to tap in to to power the CRAP that was added on.

It was like a 1996 Chev S-10 that I bought (which was a real clean unit in itself) but had some issues with the electrical. Sure enough, I looked under the dash and around and some clown put in a very complicated alarm system (which looked like this "spider web" of wires in these fotos..) to have attached to the aftermarket sound system that was taken out before they traded it in at this one dealership.

It took me two hours to completely eliminate all of that CRAP and restored it to factory wiring - which completely settled down the electrical issues that was present.

...which is the challenge that faces you now - to completely eliminate what was added and return it to stock form.

Dang! .. and good luck to you - DSM

 

[kmofom]

I hate wiring and after seeing this headache I rather not mess it up with my lack of electrical background. Haha. So since it's at a friends house were gonna tow it to his dads job (he's a mechanic) and he's going to sort it out. I honestly don't know how the hell the car didn't catch fire.