DC871F

Fuel pressure checks ok, Not quite 30 at idle, but a solid 37 at acceleration. I'm a PSI off, but may be the gauge.

Hey you're right. I was stuck in the frame of trying to read ground.

I did the test with it on the car. It just showed an open on all three terminals, not "0", or a large resistance reading. The ground I used was good. Re-installed TVS, took car out and drove it about 90 miles. There is definitely a "sweet" spot on the accelerator peddle, about 75-80% full throttle to where the car will accelerate smoothly. Also, I think the fuel consumption is way high, but that will have to wait till tomorrow to confirm how much gas it used, it may be the fuel sender lying to me. I will go out tomorrow and do the insulator test through the ECU plug, since last time I did all 3 tests with the TVS disconnected.

TVS clean, no defects I could see. Filed the contacts, cleaned, reinstalled. Still cant get it to pass the insulator test on p.82, whatever that test means. Maybe theres a short in the 3 prong plug, but it looks intact. Just for future reference for anybody else. You have to drill the 2 small pop rivets to get the cover off.

I did that about 25 years ago with a TurboZX, that was a huge mistake. And I was at work when I did it, it was a long herky jerky ride home, LOL.

It will be the first place I go this morning, after it warms up a little. Could have got 4 240Z's working in the time this ZX is taking.

Yeah, disregard, had the TVS disconnected, so....... Its 25 degrees tonight in N.FLA, been back and forth between fire place and garage, forgot to hook the TVS back up. So at least I dont have to chase wires tonight. So if the TVS does not pass the insulation test, I'll at least need to replace. Would this cause my issue?

Did the procedure on p.82. For some reason its not testing through the ECU plug. Testing the TVS directly I get continuity on the idle and full open throttle. I do not get a good test on the insulation test. When testing through the ECU plug, do you need a ground jumper? Thanks.

Yes, have wait till I get a gauge, until then I'll look other places. Aftermarket pump installed with the rest of the fuel system components.

Forgot to add, I couldnt get a the TPS insulator check to pass either out on the TPS sensor. So I guess the TPS is bad. AFM is clean and shinny like its 1982.

I replaced the EGR with a new one. Kept the old one, so I'll give it a go.

Only under load. I have not looked under the AFM cap, might go out now and do that. When I mentioned AFM before in my last post, I meant FSM. I use AFM at work, so I just flowed out. The AFM is under constant motion right, always making corrections. I was thinking it was something that was consistent, no what I mean?

Did the clamp trick, no change. I got the resister in from ZDepot, but will hold off an that until I do more testing.

I went through fuel system, but it could be that something dislodged. Car sat for many years, and fuel system was completely taken apart. Only thing original are the fuel lines under the car, which I blew out pretty good with air and gas.

Testing TPS. Continuity checks good at the TPS, Idle and full throttle. but at the ECU plug test as set forth by AFM, I get nothing. PIN's are PIN's correct, I dont need a year specific test for the 82 do I? Tried the clamp method on the return fuel line, no change. Did notice if I moderate the gas pedal (wiggle my foot) up towards full throttle, it does "seem" like it wants to accelerate smooth, but it may be my imagination. This was done without the clamp. All this done with the advance plugged.

Plugged advance inlet, cleaned TPS connection. No change. I go back through the fuel system and I'll start looking at the FSM for testing components. Thanks guys.

OK, so I read Zeds post about when the VA operates, and I hear what your saying. So lets talk about what the car is doing in a little more detail then. Starting from a red light, you accelerate normally until about high 2000's RPM an then a hesitation sets in running through each gear at around this RPM range. In 3rd, 4th gear, you can stand on the gas peddle and the car just acts as if you are disconnecting a plug wire or two, or grounding out, and will do this until you let off the gas, with anemic acceleration. New plug wires, plugs, and they are routed as to not ground out on anything, because at first thats what I thought it was. I guess I was hoping for an easy fix. If you get on the highway, 70 MPH for example, it cruises fine. New gas tank (NOS) from a donor car, fuel pump, filter, lines (engine bay only), fuel rail, injectors. New EGR(manual transmission), 02 sensor, PCV, cap, rotor. New battery, Hitachi alternator (overhauled), New belts. I have been through the wiring harness at all the plugs around the engine hoping for some corrosion, but nothing really notable. About 25 years ago, I had an 81NA, and it did this sort of thing but 10 times worse, and it was the AFM. I have not done anything with this car regarding the AFM. Thanks for all the replies. Added a few pics, just for SAG's. Driver seat is the only thing really bad with interior, everything else was nice. A tiny hairline crack in dash, thats it.

At work, I work overseas, so nothing new to add. My advance doesn't move period, its like sucking on a soda straw, just air. I'll plug it at first chance to see if there's a change. Resistor will be here next week. May be able to get to the car Thursday, maybe.....

Yes, multi-faceted. It ran smooth once I got it back on the road, pulled real nice. After the hesitation started I then went through all the electrical connectors, then re-inspecting all the vacuum lines. So once I got (back) to the distributor is when I found the advance sucking air. Car sat for 20 years, so the condition of the diaphragm may have been poor. I found the resistor on ZCar depot, probably not a bad idea. Won't be near the car for about a week, so it will have to wait. I appreciate you looking for parts, thanks. It seems that the advance is going to hard to source, not sure why since a reman distributor is easy to find.

Spring plate operates smoothly and returns fine when exercised manually. The diaphragm definitely is not working, with a vacuum bleeder or sucking on the hose, just pulls air.

Thanks for all the help guys. It seems the vacuum advance is shot. Been looking around for just the advance can, but no dice. Can get the entire distributor, but that seems overkill and expensive. 119,000 miles on the car, so the distributor should still be good. Anyone know where to get the correct part? The regular parts houses offer only rebuilt distributors, not the advance, or at least not the correct one.

73 240, in the middle of restoration. Very low miles, all original. The ZX was a side diversion, that turned into a mini project. I have had a few 240's back in the day, then I got into ZX's about 20 years ago. So when I found the 82 sitting and wasting away, I remembered how good the ZX's were and couldn't resist. They are not a 240, but a great car in there own right.

Its very clean inside dizzy, so before I got the car running I just installed new cap, rotor and wires with new plugs. I just got done inspecting vacuum advance, and I cant get it to move with a vacuum bleeder. Suck on the hose and it pulls air through (no holes in the hose). It operated normal with a flat blade screw driver, returns fine, I'm thinking if its pulling air through the hose, it must be jacked up. Thanks for all the replies.

I guess you're right, enjoying the chase, in between making Christmas gifts. Resurrected this car from a junk yard, almost zero rust, 119,000 miles, all complete. Everything works, sat for 20 years. If I can get it to accelerate smooth, its done. I'll check it out, thank you. Merry Christmas

82 NA, hesitation during acceleration. Runs fine at highway speeds, intermediate speeds other than acceleration. Car sat for many years and finally back on the road. New injectors, new EGR, 02 sensor, alternator, fuel pump, fuel filter, fuel rail, fuel tank, cap, rotor, plugs, wires. Water temperature is normal, vacuum lines are intact. All electric connectors are tight, but some have the 30 year curse on them where the connector boots are deteriorated. ECU light operational (fast blinking). Have not opened up the AFM or changed ignition module. Doesnt seem like a distributor problem, but I'm not an expert. Thanks for any help.