ll77

Ok I bought a oil pressure gauge today b/c I read that those are ok for my application between the fuel filter and rail. I can't believe how hard it is to get one for fuel injection applications! I'll get the fitting tomorrow, but I might take it in to the shop tomorrow too, so I might not have the car for a while. I'll have updates ASAP! Oh yeah, and I had a bit of a thought bubble today. I learned in my physiology class that when blood capillaries contract (get narrower), blood pressure increases because blood must travel through a smaller area. Could having smaller diameter fuel line also increase my fuel pressure? The fittings on my FPR seemed to be very tight for the hoses, perhaps the PO used the wrong size fuel line. Hmm... any thoughts?

Bad news, oreilly's didn't have in-line gauges, PCV valves, or chain tension retainers for me. I guess it's time to shop. I think I'll take her to the shop to get the chain adjusted, dash removed (so I can check my hazard flashers), and injector screws loosened up (totally rounded). I put in a new FPR a couple months ago b/c of the reading from the gauge. When I get a new gauge (today?) I'll get a good reading for you guys. About the AFM, I have the wrong model for my year, so I adjusted (leaner) to try to compensate. My smog report says I'm waaaaay rich. Also it is a "fuel injection corp." rebuilt AFM. I've heard that rebuilt AFMs have an issue with their counterweights, creating extra resistance at the flap, making it lean at idle. Makes some sense right? Oh yes, the boot is cracked. I tried to sealing it with rtv, don't know if it did any good. I hope to have an AFM w/ boots coming real soon. I have a bunch of fuel and vacuum line sitting, I'll throw it on ASAP. Just been discouraged by the injector screws (wanted to change all the lines at once haha). I also have the EFI bible and I've performed all the tests on there, everything's ok. But I haven't performed the Air and water temp sensors hot yet. I'm off to put everything back together and go shopping now. I'll keep you guys posted, Thanks!

Yeah, the gauge really is terrible, it's probably not that high. I'll update tomorrow when I put on a new gauge. But since my vacuum is so low, I really suspect the valve timing since it seems to be ridiculously advanced.

Hmm. I have not tried that yet, I'll try tomorrow. But it could very well be the gauge, it acts very strangely, I'll definitely put in a new gauge too. Do you mean the oil cap on the cam cover? I'll try that too, and I also suspect a vacuum leak, perhaps at the manifold gasket. There is a hissing noise, but I've sprayed propane on all the vacuum hoses, fittings, and CSV. a31-625-000. I believe it's a later 77-78 model.

I have a 76 280z that runs rough, lacks power, and is quite gas-inefficient. I checked my air temp sensor and water temp sensor w/ a multimeter, and they read acceptably. I hooked up a vacuum gauge with a T at the FPR vac line, and these were the results: ~10.5 in Hg @ 800 rpm (not jumpy, but twitchy) (I don't have a tachometer yet, sorry) drops to ~4.5 in as throttle is applied raises back to ~10 in to WOT up to ~20 in @ throttle release Fuel pressure (gauge is not very accurate) 39 psi (idle)- 42/43 psi (throttle applied) I tried messing with the AFM (PO put wrong one on the car)- gave it more fuel while also decreasing idle back to 800 rpm (my dad was screaming the tach reading to me over the exhaust hahaha) and my vacuum started drifting steadily between 15-17 inches, which would be more acceptable. I don't have any big irregularities except for the fact that the vacuum is SO LOW, and I understand that is causing my very high fuel pressure. I checked my valve timing, I cranked the crank pulley till the timing mark was at 0 deg BTDC, so TDC. Weird side note: my intake/exhaust cam lobes were making 11:15, if the intake were the hour hand and exhaust was the minute hand (relative to timing chain). Also the dizzy was pointing underneath the upper radiator hose, looked as if it were already touching the #1 plug wire contact. That don't seem right. So anyways, I looked to the marks on the cam sprocket, and the triangle was waaaay to the EDIT**right of the mark. So I'm too advanced, I wonder how that happened. Then I decided to look at my PCV valve, so I popped off the hose under the BCDD going to the intake manifold, nothing there! Just a bunch of carbon. Whaatt? I need a PCV valve. SOO, I've gathered I need to adjust my valve timing, and the right model AFM would help too, yeah? What do you guys gather from this? Thanks a bunch for any input!