I put one of those aftermarket high decibel horns in my car. After using it one day, the car started running pretty crappy, limped it home, now it won't start.
A little starter fluid will make it kick for a second or two, then it dies. I've got spark and fuel.
All the fuses are good.
Could I have fried the alt? Or possibly fried something else? I tried a second ecu just in case that was the issue--same results.

 

Sounds like the fuel pump crapped out. Do you have pressure of is it just flow. Also check the AFM and make sure it is working correctly and is plugged in

 

I tried pullingthe line from the primary rail. It's flowing fuel.
The afm is plugged in.

 

Do the horns still work?
Try charging the battery and testing the alternator.

 

I pulled the horn assuming that's what caused the prob. Lights, signals, etc work.
The only way I know how to test the alternator is by starting the car and comparing volt readings to when the engine is not running.

Do you know of a way to test the alt without starting the car?

 

Pull it off and hike to Autozone.

 

Y, that was the plan.

 

never mentioned the series of car.
S5?.limp mode?..

 

s4.

 

Autozone says the alt's good.
I pulled the fuel line off the lower rail, crancked and it flows fuel.
Could the injectors be fried?

 

I pulled the injectors and cranked. The injectors are shooting fuel.
Any other suggestions?

 

aftermarket fuel pump? can you hear it kick on with key in on position?also did it just start running crappy instantly gotta make sure you didnt pop a seal in the motor.

 

Was determined to get that thing running today.
Pulled everything apart. Last thing I did was crank it with the trailing plug out on #2 rotor. Didn't hear the familiar compression sound. Tested. No compression. .. @!$#%@#%@#% ..
Spent the rest of the afternoon prepping the engine for removal and sourcing a hoist.
Looks like I need some rotary resurrection.
Don't understand how it happened. .. whatever .. Time for a rebuild.
:-(

 

Did you try ATF first?

 

Yep.

 

Man thats no goo, sorry to hear.