Russ-R

Recently, my car died on me on my way somewhere. I was in third gear and hit the gas but nothing happened. Eventually it stopped and died along side of the road. I've replaced the fuel pump and the fuel filter. I've checked for spark and checked my fuses. I'm stumped. When checking the fuel injectors, i cranked the car while the injectors were out, but still connected to the fuel rail and no fuel came out. So I'm thinking that the fuel injectors are clogged. I needed the car to run so i switched the secondaries and put them as the primaries but still no fuel would come out. Fuel is getting through the fuel line and im sure i have enough fuel pressure. Could it be that my secondaries also got clogged? Also, when your crank the car, do the secondaries give gas to start up or is it only the primaries.

rx7roller02

At startup, it is only your primaries that come on. Secondaries don't come on until around 3500 rpm. Also, have you checked your TPS? IT could be messed up and not opening up the gas for you. I am having a similar problem right now with my GXL--when driving, it would hesitate randomly, and before I got a chance to check it out, it just wouldn't start one day. Since it is not my daily driver, I am thinking it is time for some serious work. Gonna send out the injectors to CruizinPerformance for a good cleaning--I know of someone on here that had similar problems to us, and when he did that, the car fired right up. But I would check your TPS first. Do a search for how to test it in here.

Russ-R

Ok, i did the diagonostic test, and it gave my the tps code. How would the TPS affect the injectors opening. I tested the current to the primary injectors while cranking and it had current.

EDIT: Stupid me, had the TPS sensor uplugged, gonna check the test thing again.

Russ-R

ok, it isnt throwing any tps codes.

alwayssideways

have you checked your Egi fuse ????? first place i would look

HAILERS

On a series four, the 40a EGI INJ feeds both the coils and the injectors. So it stands to reason that IF you have spark you should have powerat the fuel injectors. Take a meter, and with the key to ON, see if one of the two wires at the injectors has battery voltage. All four injector plugs should have that battery voltage.

The ECU is the item that pulses a ground to the fuel injectors to cause them to open momentarily. See if you have battery voltage on the pin 3I with the key to ON.

I'm assuming that the fuel pump is running because you said you could hear it running the rails. And I'm assuming you have spark because you said you checked for it, but didn't really come out and say you had spark. So do you have spark?

If you do, that is a clue. The ECU uses the cas signal to determine spark AND when the fuel injectors pulse. It stands to reason that if you've spark then the fuel injectors should pulse. It'd be odd if you had one without the other. Since you have spark I assume the cas plug is connected.

It's REAL hard to believe the injectors all clogged up at the same time.

While your at the ECU, see if you have less than one ohm on the pins 3A, 3G, and 2R.

The above is for a series four car only.

BDentonFC

Definitely check these ground pins. I had a similar problem where my injectors wouldn not fire. They had power at thier appropriate pins but didnt work. Turns out the ecu ground on the block was bad. I too agree that it seems very unlikely that your two primary injectors would simultaniously clog.

neu

could be something with the AFM... since you've been checking and throwing parts at the fuel system... think about the intake for a minute

Russ-R

i checked 3I, its getting battery voltage. Didnt have enough time to check the rest. I looked at the manual and it said 0v should be the reading for it. So im guessing that anything between 0v-1v would be fine. But just incase, where would be the grounds located on the block? Also, I am getting spark from all of the sparkplugs. But when checking sensors at the injectors, only the primaries worked when cranked and secondaries got no current.

HAILERS

1. What year car?

2. About 3I......I don't understand what you said about the manual saying it should be less than 1volt. It should be battery voltage with the key to ON. IF it is a series four car.

3. I don't understand what you are saying about the injectors. Only the primarys are supposed to inject below 3500rpm. You said they are injecting??????? The secondarys won't draw current until 3500 rpm.

4. Are you real sure you have fuel pressure in the rail??????

Russ-R

Lol sorry, i was talking about the 3A, 3G, and 2R pin. Mine is a 1987. Primaries are getting current but not injecting. And im really sure there is pressure in the fuel rail, injectors popped off when my friend cranked the car when i forgot to hold the injectors steady.

RotaryEvolution

iTrader: (30)

the ground is on the rear rotor housing, there is a ring terminal there with about 3 black wires in it, remove that and clean it and tighten it down snug and see if it helps. wouldn't hurt to also clean the ground wire at the battery terminal and where it bolts to the starter as well.

Russ-R

im having trouble locating the ground, is it on the passenger side or driver side.

J-Rat

iTrader: (2)

Well,

Karack has a great idea, but you have to gain access to that ring terminal by raising the UIM and throttle body. Big job. Plus a ground usually causes a slow degradation of injector performance, not a sudden loss of all injector function (but it COULD have happened, just not very likely). Is your UIM already removed?

You said you pulled up the Primary fuel rail, and cranked the car with the injectors still in the rail, and nothing happened? How did you restrain the injectors to the rail? If you had normal fuel pressure you would be searching for your injectors right now because the fuel pressure would have launched them to the moon unless you restrained them somehow.

Normal ops.. Secondaries only come on above 3800 RPM.

My guess? You have a poopy Fuel pump.

Rat

HAILERS

How sure are you that you have spark??????????? The cas is the big ticket for both spark and fuel injection. If one has spark he almost always has fuel injected. That's why I ask the question about spark.

If I had neither spark or fuel being injected, I'd take a look at pin 2a with the key to ON. You should have approx 4-5volts. That's with the plug connected and backprobing the 2a wire.