sk8ersds Posted June 1, 2008 Share Posted June 1, 2008 I am being stumped. I have had my z for about 3 months now and I feel like it wastes to much gas(like 11 mpg bad). I have checked my wires, checked for vacuum leaks, changed the fuel filter, spark plugs, air filter and keep my car well maintained. It smells like it is really rich but i don't know how to adjust that. Also does anybody know where to find a rhd conversion for the z31 or does it just not exist as a kit. Thanks for the time. Quote Link to comment Share on other sites More sharing options...
evildky Posted June 3, 2008 Share Posted June 3, 2008 sounds like the problem might bewith your right foot, I assume you ca is a turbo to get such bad milage, stay out of boost and yout fuel consumption will go down, you can also run smaller lighter wheels with narrow tires, keep top speeds under 55 mph and try keeping the revs under 3k in any given gear, and druise the interstate as much as possible, as for RHD, I think it's playred out and retarded but all you gotta do issource a JDM front cut, it'll have all the RHD parts and will liely cost as much as a complete Z31 Quote Link to comment Share on other sites More sharing options...
sk8ersds Posted June 3, 2008 Author Share Posted June 3, 2008 no my car is na (that is just a pic of what i like mine to look like) but in the city i live in there is no streets that you can go fast on it is just an everyday driver for me. Quote Link to comment Share on other sites More sharing options...
greygears Posted June 3, 2008 Share Posted June 3, 2008 11mpg?? That’s horrible! Check your fuel pressure. It should be around 34 to 38psi at idle. If your return line to the fuel tank is plugged your going to see 70 to 90psi, which will turn your fuel injectors into parts washers. Check your fuel pressure regulator too. Pull the vacuum line off the manifold that goes to the pressure regulator and suck on it (that’s not an insult). If you taste gas, most likely your pressure regulator is junk. I’ve seen both of these things wrong at the same time, so check them both. If you fix the problem, a new set of plugs plus an oil and filter change will be in order. You probably dumped more than couple of quarts gas in your crankcase if this has been going on long enough. Lets see…11mpg divided by $4.15 per gallon equals…OH MY GOD! Quote Link to comment Share on other sites More sharing options...
sk8ersds Posted June 6, 2008 Author Share Posted June 6, 2008 thanks for the reply i will make sure i do that today. i would have never guessed that it could be the regulator or return line(i am not a mechanic i am just mechanically inclined). Quote Link to comment Share on other sites More sharing options...
zmech Posted June 15, 2008 Share Posted June 15, 2008 You really need to check out all your sensors. It should be obvious that a sensor is really bad. Try the CHTS, O2 sensor and timing. Quote Link to comment Share on other sites More sharing options...
1badzx Posted June 18, 2008 Share Posted June 18, 2008 I would change the PVC valve...thats a cheap... also,,,buy put some Lucas feul injector cleaner...it works wonders!!! Quote Link to comment Share on other sites More sharing options...
roger.svoboda Posted July 1, 2008 Share Posted July 1, 2008 you should be getting 18-20 around town. My 85 turbo gets that. Check with a good flashlight around all the injectors and hose connections on the fuel system to be sure you have no leak. Don't forget to check by fuel filter. My son was a little weak putting on a new filter and mileage dropped a lot. Quote Link to comment Share on other sites More sharing options...
Trevor Posted July 11, 2008 Share Posted July 11, 2008 I had a problem with my Z31T running too lean under boost. Underneath the upper intake plenum on the VG30 I found there is a mass of rubber vacuum hoses. After 20-24 years they dry out, rot, split and create a manifold leak. Start by replacing all of those hoses. Quote Link to comment Share on other sites More sharing options...
DuoWing Posted July 11, 2008 Share Posted July 11, 2008 If the car runs good all around I'd say your CHTS is fine. I'd definitely check your O2 sensor, there's a good chance it's never been replaced or even if it has. It's probably dead. Quote Link to comment Share on other sites More sharing options...
Guest Jenna86 Posted August 28, 2008 Share Posted August 28, 2008 You might also run the ecu self diagnostic (do a search or check a haynes manual) and see if any of your sensors code. That will give you a good idea where to start if it is an electrical or sensor problem. Quote Link to comment Share on other sites More sharing options...
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