I had a 91 na s5 that i crashed. I bought a 89 s5 auto and swapped my manual tranny plus motor from the 91 into the automatic shell 89. I am currently stuck due to the fact that i have completed the swap and cant get the car to fire. It will crank all day. Ive replaced the battery, pulled the fuel lines at tht entrance to the engine and insured that i have fuel going to the motor. Ive replaced the spark plugs and insured i am getting spark across the board. I have double and triple checked the spark plug wires and insured that they are in the right order. I even jumped the neutral saftey switch for the auto and thats insured by the fact that the car cranks now. Someone please tell me how i can check to see if the injectors are delivering fuel into the housings. thats really the only thing left. Btw the engine ran perfectly fine in my old car. Could it possibly be an engine grounding issue? maybe an ecu grounding issue? (yes i am using the ecu out of the old car). I am in desprate need of help and anyone that could do so would be greatly appreciated.

 

spray a few shots of starting fluid into the intake and see what happens.

 

anyone else? please i really need to figure this out.

 

Did you try the starter fluid or not?

 

I'm wondering if he had tried this yet or not. ^

You have EVERYTHING swapped? EVERY ground, plug, and hose inspected? EVERYTHING necessary to get it running? Double, triple, and quadruple check your work...

 

if you want to check the injectors you'll need to pull one f the rails off. use zip ties to hold the injectors firmly to the rail. place a towel or something down to catch the fuel that will hopefully be sprayed out of the injectors. have someone try to start the car

 

Did it fire with the starting fluid?

 

Yes it did fire when I sprayed starter fluid. I've checked every plug that I can see has a connector. I'm pretty sure that the problem is with the fuel injectors not firing.

 

The only things I unplugged whe I did the swap were the ecu, the power steering, starter alternator and fuel. All the strictly nessecary **** to pull the motor and tranny (which ran fine) from my old car and dropped in the new. I need to know if there is a connector I could have missed that controls the injectors. I keep looking all over the place for two plugs that might go togethr or something and it seems to be in order. There is a four port white connector at the top right of the wiring harbess by te charcole filter I don't have plugged in. Does tat go anywhere or is it for the airbags like the blue ones next to it

 

Top left sorry

 

The Light Green wires (four of them) at the smallest ECU plug should have battery voltage on them w/key to on. This would validate that the injector plugs are connected properly and that the two wires in each plug are not pulled back thus providing a faulty connection.

Have you jumpered the fuel check connector w/key to on and listened for fuel flowing through the fuel lines? The Blue wire at the Circuit Opening relay (found under the dash and to the right of the steering wheel and is Yellow and Black) would have voltage w/key to on w/jumper in place.

 

So if hypotheticlly I tested the pin side of the ecu and had voltage but I'm still not getting fuel could my injectors be clogged

 

Do you have a scarce crank angle sensor? You could plug it in and spin it by hand with the key on and listen for the injectors to click. Also are you sure the gas line are properly routed (feed and return)? It's easy to swap them by accident on the emissions rack

 

i checked both ways and i also cross refrenced them with my buddies s4. If they are the same im sure i have that right. I however are not sure what you mean by a scarce crank angle sensor and how you are trying to tell me to test it. Remember the motor came out of the old car running and i never messed with that sensor when i pulled everything.

 

He means "spare"... I believe.

 

Have you proved you have fuel flow? Disconnecting the return fuel line and placing it in a jug and jumpering the fuel check connector w/key to on will tell you a bunch.

 

I pulled the fuel lines going to the block and cranked it. It deffinitly pumped fuel. I'm just not getting any inside the motor. I even pulled a plug and cranked it over and tried to smell/see any fuel insie and got nadda.

 

u sure the pump is kicking on and pushing also i know i had old gas i let mine set for like 6 months and i had to drain all my gas and replace it and still use starter fluid a few times to get it running.

 

You can have a situation where fuel goes in, but doesn't come out, so this is why you would want to check the return flow line as it verifies fuel going in and fuel going out. And the four ECU Light Green wires related to the injectors would be in a different plug then I past stated as I forgot your car is an S5 so yours would be in the largest plug far left end of the ECU plug.

 

make sure the ground loop on the engine harness is bolted to the rear rotor housing.

 

Satch ill pull the return and try to crank it into a jug. Karak I have the one that connects to the firewall and drops below the motor connected. And I'm getting spark which means the engine is grounded. I got it to fire on starter fluid but it won't give any fuel.

 

that's not the engine harness and has nothing to do with spark either. it has a great deal to do with whether the ECU actually gets a ground to switch the injectors on or not.

the ground terminal splits off the main engine harness close by the primary injectors where the harness loops back around the rear half of the engine.

 

Yep my earlier post got auto corrected by my phone, sorry I meant spare cas. If you have a spare one, which I'm not sure if you pulled the motor out of your donor body and still have it, you can leave yours installed and plug in the extra one and spin the gear by hand with the key on and listen for the injectors to click, but you will also hear the plugs snap from spark unless you unplug your coils, or listen carefully. Its easier and "better" then pulling the one already on your once running engine. They aren't the easiest to get reinstalled properly without messing with it a few times.

 

I don't have a spare cas unfortunatly. And I checked the ground hanging off the manifold at the top right that's fine. And underneath that ones good to. And the ecu pins for the injector wires are fully functional.

 

So I have spark and compression but I'm not getting fuel. I checked the ecu pins for te injectors and they are fine. I replaced a fuel filter and guarenteed that I'm gtting fuel to the engine. But I'm still not getting fuel inside the motor. Can someone please help wit this? The next thing I'm going to do id replace the injectors its the only thing I can think would still be fucked up.