sprocket_3

Hey I just bought a 88 GXL and the kid I bought it from tried replacing the omp lines and he got them all switched around. now the car won't start. It sputters and maybe will start and rev to like 3k and then shut off. He said he also replaced the fuel filter but he said it ran after that. If anyone has some advice. I already did the flooding fix a few times with 20-50 not atf.

RotaMan99

Switching the OMP lines around wont cause your engine to stumble.

Chances are he didn't put something back together right. Such as vacuum lines or leaky intake manifold gaskets

sprocket_3

Thanks I'll check and post my results. I'm new to this whole rx7 business.

turbo10th

iTrader: (6)

Sure he didn't switch the fuel lines up some how?

sprocket_3

I don't know. I was wondering that, but I don't know how they went originally and using the fuel diagrams are impossible.

sprocket_3

He hooked the fuel filter up to the pressure regulator is that where it goes on these cars?

ramses666

iTrader: (1)

Nope...fuel filter to pressure regulator is backwards. It goes the other way. Make sure MAF is plugged in.

Ramses666

sprocket_3

The MAF is on the air intake correct its the silver box on the bottom of it.

sprocket_3

I got it to start with starting fluid but as soon as I stopped spraying it stopped firing and It started smoking in the back of the motor I think it has a exhaust leak

locketine

try flooring it after turning her over. If it runs fine at high rpm he got the fuel lines backwards... I did this after I rebuilt my motor last year, it had the exact same symptoms as what your having....well minus the smoke. If this works take off the intake manifold and swap the wire going to the upper two injectors with the wire going to the bottom two.

myersprostatus

iTrader: (2)

sounds like a vacuum leak

HAILERS

Did you fix the fuel line problem?????? As described above?????? The very LAST item in the fuel system is the FPR, not the first thing. Next time, remove the RETURN line off the engine and look for fuel flow when the vane in the afm is pushed aft with the key ON, or when the fuel pump check connector is jumpered with the key to ON. IF the fuel system is up to snuff, fuel will flow continuously when you do either of those two things. It'll flow FROM the Return line off the engine is what I'm saying.

EDIT: I re-read the original thread. I've changed my mind. Either the electrical plug is off the AFM or you/he left a LARGE air intake line off( mentioned in a thread above). On a n/a look for the half inch line being off the bottom of the duct that feeds the throttle body and comes from the AFM. That's what was wrong in another similar post a day or two ago.

RX will Start up without the afm plug on the afm, because the ECU uses a internal fuel map during Starting. Once the engine starts and is above 500 rpm, the afm supplys the fuel needs. If it's disconnected the engine will die of fuel starvation.

sprocket_3

I checked my large vacuum off the intake with my buddys car and its the same. I also checked the fuel lines and they also appear to be the same. I don't know how to locate or opperate the fuel pump check connector if anyone can assist me I know i'm a noob or what ever but any assistance would be great. I've just been on forums 14 hours a day for the last week trying to fix this thing. I was a honda guy which I know are cake and they suck compared to these cars.

HAILERS

It's circled in the jpg attached. IN purple. It's a two socket, yellow connector connected to nothing. It floats on the harness. You may have to poke around to find it.

Just put a paper clip b/t the two sockets. Key to ON. Now the pump runs.

There is no voltage on those two sockets. One goes directly to gnd. The other goes to the ground on the circuit opening relay. Key to on the relays coil has 12vdc. Jumper the two sockets on the yellow plug and you put a gnd on the coil and the relay pulls in operating the pump. Pump runs continuously with the key to ON and jumper in place.

sprocket_3

Okay so I pulled the injectors and when I did it didn't have any fuel pressure. It didn't spray at all it just leaked the fuel out. How do I test the fuel pressure on the fuel pump?

HAILERS

Fuel pump only runs if the engine is running.

Fuel pump only runs if the key is HELD TO START.

Fuel pump runs if the key is to ON and the fuel pump check connector is jumpered.

Fuel pump runs if the key is to ON and the vane in the afm is pushed back at least a quarter inch.

Fuel pump does not run if the key is just to ON.

Fuel pump does not run if any of the above conditons are met but the ENGINE fuse is blown or out.

When the fuel pump runs you can HEAR the fuel passing thru the fuel rail constantly and returning to the tank. It runs continuously.

You check the fuel pump pressure by putting a fuel/pressure gauge in the pressure line. You TEE the gauge in the line.

You don't mention if you hear the pump runnning or have jumpered the fuel pump check connector or....

Leaked fuel out??? You did what and the fuel leaked out of what? If the pump was running and you unbolted the fuel rail the fuel would shove the injector off and on to the floor. IF the key was off and you removed the fuel injector then fuel should dribble out the fuel rail. Residual fuel.

sprocket_3

Thanks for the info by the way. I checked the flow and its flowing just fine. I just discovered however that when I took the dynamic chamber apart the lowest part had thick sludge in it. It smelled like gas and looked like oil and had tons of carbon deposits in it. I think it was a mix of the three. What could be causing that?