https://www.rx7club.com/ en Sat, 16 May 2026 09:44:07 GMT vBulletin 60 https://www.rx7club.com/images/misc/rss.jpg https://www.rx7club.com/ https://www.rx7club.com/2nd-gen-general-discussion-323/s4-na-fuel-pressure-issue-1173172/ Sun, 03 May 2026 22:17:25 GMT Hi all

I've posted about my S4's numerous issues before and I have since gotten it started and it starts consistently, however, I am having even more issue than I did before (go figure). The main issue I'm having now is it runs very rich, making the cats glow and making so little power that popping the headlights almost stalls it out. Obviously not ideal for street driving or passing an inspection and, after several weeks of diagnosis and research, I am completely stumped, so I now ask for your help in maybe finding some answers or if anyone has dealt with and fixed this kind of issue.

So the symptoms I'm experiencing; the fuel pressure measured before the injectors with the key on is around 45 psi, obviously outside of the ~29-38 listed in the fsm. The fuel system also does not currently hold pressure without the fuel pump running, dropping down to 0 in a matter of seconds. One of the two previous owners had wired the fuel pump to always run directly from the battery when the key is on (something I plan to return to stock but that isn't priority with current issues), so that might contribute to the pressure being too high? I admit to being a noob here.

What I've tried so far:
I've tried three different fuel pressure regulators; the one that came with the car, a oem style BOSCH unit I got off ebay (new old stock I think), and a brand new regulator from RockAuto. None of these three made any changes to the issues. In addition to the FPR, I've also replaced the fuel pump. One of the previous owners had replaced to stock one with an aftermarket unit that's rated higher than whats listed in the fsm, so I got one also from RockAuto that is closer to factory spec. This also did not change the situation. I've tried disconnecting the return line at the rats nest and at the FPR to rule out any blockages after the FPR that would raise fuel pressure, letting it dump into a bucket. Still 45 psi. To diagnose the issue with holding fuel pressure, I clamped off the return line and ran the pump for a few seconds. Pressure held very high like I'd expect, and dropped of to zero as soon as I released the clamp.

All of these diagnostics point me towards a bad FPR but it seems statistically unlikely that I have three bum FPRs, two of them fresh from the box.

As I've said before, I'm a complete noob to rotaries (and project cars for that mater) so any help or diagnostic tips would be greatly appreciated. I can provide any more details if needed, Thanks for reading my very long (and a little ranty) post,
]]> 2nd Gen General Discussion DasIsGoot https://www.rx7club.com/2nd-gen-general-discussion-323/s4-na-fuel-pressure-issue-1173172/ https://www.rx7club.com/2nd-gen-general-discussion-323/use-s5-harness-s4-1173109/ Sat, 25 Apr 2026 18:43:04 GMT Hi, has anybody used F061-67-070E in an s4 car? Its the driver side (lhd) harness with the battery connections. Just wondering if the connectors and stuff are the same, since its the only one I can... Hi, has anybody used F061-67-070E in an s4 car? Its the driver side (lhd) harness with the battery connections. Just wondering if the connectors and stuff are the same, since its the only one I can buy new. Thanks ]]> 2nd Gen General Discussion Patrick13bt https://www.rx7club.com/2nd-gen-general-discussion-323/use-s5-harness-s4-1173109/ https://www.rx7club.com/2nd-gen-general-discussion-323/maf-trouble-1173104/ Sat, 25 Apr 2026 04:54:05 GMT hi yall, my fc is giving me more grief as per usual. it dosent want to run and it seems like it’s flooding itself out but will run and limp-drive with the MAF unplugged. i replaced the MAF but it’s... hi yall, my fc is giving me more grief as per usual. it dosent want to run and it seems like it’s flooding itself out but will run and limp-drive with the MAF unplugged. i replaced the MAF but it’s still doing the same thing. any thoughts as to what’s wrong? it turns over and sputters a lot but just can’t get running. i’ve taken the upper intake manifold off like 5 times now looking for vacuum leaks and missed wires but can’t find anything. ]]> 2nd Gen General Discussion james111 https://www.rx7club.com/2nd-gen-general-discussion-323/maf-trouble-1173104/ https://www.rx7club.com/2nd-gen-general-discussion-323/rx-7-guru-mechanic-atlanta-area-1173078/ Thu, 23 Apr 2026 00:24:41 GMT Modified 88 Vert converted to turbo. Looking for someone who works on Rx-7. Have no way to get back into wolf 3d system. Would entertain swapping to a newer engine management system. greddy... Modified 88 Vert converted to turbo. Looking for someone who works on Rx-7.
Have no way to get back into wolf 3d system. Would entertain swapping to a newer engine management system.
greddy professional B seems stuck on about 5-6 lbs of boost.
a few other minor issues I would address if I could find a reputable good mechanic.

Here is the short list of Mods,
ND fuel pump
Turbo II Motor
3mm Apex seals
3mm corner seals
Gredd Power extreme exhaust
Cross drilled rotors, Stainless Brake lines
Down pipe
Wolf 3D Engine Management System
Fluidyne Auminum Radiator
Stage II Turbo Upgrade
ACT PP and clutch Components
Greddy Turbo Timer
Greddy Front Mount Intercooler
Phantom Vac/boost and Water Temp and EGT Guages
Nippon Denso 720 CC injectors
Cold Air Intake
Hi flow cat
Greddy Blow off Valve
Sport Springs
Kyb ADJ SHocks front and rear
Greddy Profec B ]]> 2nd Gen General Discussion derb22 https://www.rx7club.com/2nd-gen-general-discussion-323/rx-7-guru-mechanic-atlanta-area-1173078/ https://www.rx7club.com/2nd-gen-general-discussion-323/1990-gxl-potential-buy-1173062/ Tue, 21 Apr 2026 22:31:27 GMT I am looking at a 1990 GXL with 86,500 miles and automatic. Original owner, oem everything, and in very good condition. They want $10k. What is a good offer? I am looking at a 1990 GXL with 86,500 miles and automatic. Original owner, oem everything, and in very good condition. They want $10k. What is a good offer? ]]> 2nd Gen General Discussion Pietro931 https://www.rx7club.com/2nd-gen-general-discussion-323/1990-gxl-potential-buy-1173062/ https://www.rx7club.com/2nd-gen-general-discussion-323/10th-ae-pricing-discussion-1173059/ Tue, 21 Apr 2026 17:39:09 GMT There are plenty of posts out there asking, "Whats my mint 19XX RX7 with 17mi worth", but those are the rarest of the rare cars.
What I want to discuss the value of clapped out cars!!

I recently went to check out a 10AE that's posted for sale locally. Typical white paint flaking off and starting to rust throughout. Missing a couple moldings. 10th shift **** is MIA. Seats are CLAPPED. Chip in the windshield. Normal interior items broke/missing.... BUT.... it does fire right up, idles sounds steady, no structural rust, and clean title.

For the sake of discussion, what do YOU think something like that would be worth? What's the value in a VIN, a few trim choices, and the knowledge that the car is probably 1 of ~1000 these days (at best). You can find examples of good/great condition cars on BaT for 20-40k$, with the top end being near mint of course. I know personally my build would be "resto-mod", and maybe not be the most desirable, BUT.. I bet Id still be out of pocket 20k$+ on a vehicle like this to make it right.

Thoughts? Is a clapped 10thAE worth 8$?.. 5k$?.. 15k$.. 9 million Iranian Rial? ]]> 2nd Gen General Discussion Mustanghunter https://www.rx7club.com/2nd-gen-general-discussion-323/10th-ae-pricing-discussion-1173059/ https://www.rx7club.com/2nd-gen-general-discussion-323/back-pressure-tube-thing-1173035/ Sun, 19 Apr 2026 08:09:00 GMT hi everyone, i sold my cat when i took my car apart because i was planning to buy a whole new exhaust but my budget changed and im working with the stock system for the time being. i have a straight... hi everyone, i sold my cat when i took my car apart because i was planning to buy a whole new exhaust but my budget changed and im working with the stock system for the time being. i have a straight midpipe in place at the moment but im wondering if i need to find a way to reattach the long tube that used to go to the cat? its an s5, will my 5th/6th ports still work? i’m a bit confused as to what the tube does. thanks! ]]> 2nd Gen General Discussion james111 https://www.rx7club.com/2nd-gen-general-discussion-323/back-pressure-tube-thing-1173035/