thecause17

Well, I'm having a fuel related problem of some sort with the SE.

When the car is started(it's fairly hard to start) it runs fine, has plenty of power, revs all the way to redline, etc...

After it starts to warm up, it will not rev, usually not past about 4000rpms. At this point, I can hear the pump rather loudly, and it sounds like it's straining.

I would've said fuel filter, but I would think that it would do this all the time if it was the filter.

The pump itself works, when I jump it manually, it sounds higher pitched than it does while the car is running.

I'm leaning toward the FPR being bad or stuck, not letting the car get the fuel it needs in the upper rpm range. To me this would also explain why the pump sounds like it does when the car is running, as if the fuel pressure is buidling very high, and the FPR is not letting the fuel get by it.

Does this theory make sense? Is there a way to clean the FPR? If you don't think that's is, then what? Below the point it cuts out, the car has plenty of power, runs very nice, but is hard to cold start, and occasionaly stalls at idle.

thecause17

Well, I replaced the fuel filter, and it did not change the revving problem, but the pump sounds a little better. Does anyone have any ideas, or should I just go to the 2nd gen forum.....

thecause17

quadman_20

Fuel filter would be my first choice also.. As RPM increases, consumption follows. The filter can cause just enough resistance so the volume of fuel is fine at low RPM, but not adequate at higher engine speeds.

Change the filter and see what happens. If it doesn't correct the problem, time for volume/pressure check.

I'm assuming its the 13BFI. I'm not too familure with this system, so the rest of this might not be applicable. Most FI fuel pressure regulators rely off of engine vaccume (keep in mind low vacuume would hender proper operation). There should be a vacumme line leading to the FPR. While ideling, if you unplug the line (plugging the vaccume side of course) the engine should "hunt" to a certain degree..

If you need details for volume/pressure testing, I've found many threads on this subject here.. Search is your friend .

Ben

thecause17

I did replace the filter, I posted that.

Looks like I need to go find some other options.

quadman_20

I'm sorry.. I read the second post as if someone eles wrote it.

Good luck!

enigma32

Have you checked the pressure and flow from the fuel pump? (particularly when the car warms up)

13B4port

i had to do a lot of work on my fuel system when i went to a 88 13b. i had to make it so i was only using 2 injectors. i had a similar problem. the fpr was stuck open. i wanted to be sure so i took it off and unpluged the fuel return line and plug it up with a blot and a clamp. it reved a lot better in high rpm but died for ovbiously flooding. i just went and used the sencond gen fpr and it worked fine. but try that test. it might start hard so get a bucket and let the car get started without pluging the line and let the fuel spill into the bucket if you have a problem with flooding. but keep in min that it will need some preasire b/c the injectors need the fuel under preasure to operate.

thecause17

And how do you go about doing this?


FWIW, it was extremely hard to start today, and I even though I had flooded it, but I got it started. The whole time I was attempting to start it though, when I would let off the key, and get out of the car, I could hear the injectors firing off for a few seconds afterwards.

I'm not sure where to go from here. I don't just want to start hanging new parts on it, as that can be a huge waste of money.

thecause17

Well, I just confused myself. I remember today, when we were putting the motor back in, and were wiring things back up, I wasn't sure which plug went to which ignitor. I put them on the easiest way the wires allowed, since it seemed the that was the way they were made. I thought tonight, maybe I had them wrong afterall, and maybe this was the problem all along. So I switched them, and turned the key either expecting the car to run perfect, or not at all. It started, idled, and i took it out for a ride, and it did the same thing as before. How can this even work both ways like that, switchint the ignitor plugs around????


This leads me to another question, what about the coils? Which coil goes to which plug on the the ditsy. I just wanna verify all of this to make sure I'm ok in these areas, as I can see trailings firing first being a problem, correct? Anyways, can anyone verifty the positions of these items? I'm not so sure I have them right now unfortunately, and am trying to explore every option here.

RX7145

iTrader: (1)

It might help to install a fuel pressure gauge in-line under the hood. I know this helped me alot in trying to figger' some things out. Pressure should not drop below 40psi. If pressure is good then it's something elce.