13bpower

I have been trying to get my 91 started for a couple weeks now. I got it with a blown engine, put a good engine in, and now it just won't fire up. It is not getting fuel into the rotors. When I inject fuel directly into the manifold it will start up and die when that fuel runs out (a couple seconds).

My "circit opening relay" shows only 9 volts going to the fuel pump when the engine is cranking. On my reasearch here (and testing my 88) says it needs to be close to 14 volts (13.7 on my vert). Is this it? would this cause the fuel pump not to operate?

ALSO: I can get the fuel pump to work by jumping it. All fuel pressure and fuel hold pressures are working perfectly.

ALSO: the tps is alittle out of spec. on its ohm resistance readings.

SonicRaT

iTrader: (6)

Hmmmm.... Check your EGI fuse in the main fuse box under the hood on the drivers side strut tower, then check the 'Motor' fuse on the fuse panel underneath the drivers side dash. If that's a no go, try to pull engine codes. Are you sure you have your fuel lines on properly? If they're reversed they don't work! Let us know.

HAILERS

NO. Nine volts is normal at idle or start. The 91 fuel circuit is different than the 88. I'll buy into the fuel lines being crossed.

The 91 has a fuel pump resistor relay just like the 87/88 turboii, and those cars drive around all day long with 9-10 volts and only go to 12 plus volts when under load.

13bpower

Ummm.... Already checked all the fuses. Checked many, many things. The fuel lines: I am assuming you are referring to the incoming and return fuel lines. I have them hooked up the same as my 88. I'll swap them and give it a shot though.

Anyone else have an Idea?

Rx7Nub

Are you sure you have a good battery? If you boost it and it starts up fine, it leads me to believe the battery is not good...

-Mark

13bpower

I'm not following. THe car battery is good. The car starts when I manually put gas in the intake manifold. When that small amount of fuel burns off, the engine stalls. So I conclude fuel is not getting in. The only trouble shooting section I have left is the ECU I hope it's not bad.

HAILERS

I have read that J-Spec engines have the fuel lines just the opposite of the USA engines. Maybe that would explain why you might have to cross the fuel lines opposite from your 88.

SonicRaT

iTrader: (6)

On j-spec's the fuel feed is the line closest to the front of the car, and the return is the line closest to the rear of the car. Make sure your injectors are hooked up and connected perhaps?

13bpower

I don't have a J spec in either of the cars. The incoming fuel line is going into the rail closest to the front of the car right now. Is this how it is supposed to be on the s5 N/A's.

I am just about to work on the car now. Hopefully I will make some progress!

Thanks for the help.

HAILERS

You have it right if its not a J-Spec.

The same source of power that feeds the injectors feeds the coils, so it can't be a fuse since it fires when you spray fuel into it. If its a N/A, then I'd pull one of the secondary injector plugs off, and see if there is 12v on one of the injectors. That would confirm its not a lack of power to the injectors.

Still....about the fuel......On my series four, I can get a 19mm wrench on the secondary fuel rail, at the rear, and loosen that banjo bolt a bit, and fuel will spray if the fuel pump circuit is jumpered. Try that and see if you have fuel pressure on the secondary rail.

I'd spray some more fuel into the intake just to feel good once and a while. humor.

13bpower

Narrowed it down to the injectors. ECU is good. Fuel pressure is 38-40 throughout the system (after fuel filter, after primary fuel rail, after secondary fuel rail) when cranking the engine over.

So should I test the clip that connects to the injector, or the injector itself? Ill try both.

scathcart

Put some LED's in your injector leads. If they blink when you crank, your injectors are getting power.

13bpower

This is really starting to **** me off. I did the LED check on the injector connectors, and checked the voltage they are getting. Everything checked out perfect.

WTF, everything I have checked is perfect. This is so bizzare. I checked the injectors by hard wiring them to the battery. They click on and off like they should when the ground is on and off. I can even see the needle in the nossle moving.

Anyone have any other ideas? I am going to put the injectors back on the rail and see if any fuel comes spuwing out when I crank it over.

13bpower

Well, the injectors work. They squirt fuel when it's cranking over.

Anyone say timing could the culprit? That is what my brother is saying would be most likely.

What doesn't make sense is that it dosen't even pop. No fuel being burnt when I try to start it. SO, if the injectors are injecting fuel.... where is it going? its not gettting burned.

WTF?!?!? Help my poor *** out.