Edyz7s

Issues im dealing with
•Bad gas mileage. Smell of gas
•Misfires; backfiring a ton. Every time I would shift, the exhaust end would pop. It's gotten worse because just reving it would pop. Holding the rpms, it pops.
•Throttle response lags:
http://tinypic.com/player.php?v=25qd...9#.WCo42IVhymE
Every time I start my car when its already warm, it starts and rpms go below average idle, then idles fine. There will be times where it does it normal like how a new car or average car would do.

Things I've done:
•O2 sensor replaced brand new, not to long ago
•Fuel injector cleaner
•Tighten intercooler piping
•Checked spark plugs; they seem good to me. They all look like this one.
http://tinypic.com/view.php?pic=aelhrq&s=9#.WCo3z4VhymE
•Check coils; no cracks
•Check TPS; I disconnected while it was on and almost died, I assume that it does work.
•Check Colant temp sensor; disconnected it before starting and saw the difference when it is on

•Change Fuel filter, to 300zx twin turbo filter
•Cleaned TPS

What else should I do or check to get rid of these problem?
The misfire is the biggest concern to me as it has gotten worse.

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gaz_moose

what are your spark plugs like?

maybe you have a boost leak? perform a smoke test on it.

ultimateirving

Use a multimeter to check the tps, the technique is all over zilvia just use the search function

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Z32 with lq4 swap
Desert Street Scene || Dssevents.com

Edyz7s

My spark plugs, with all of them, look like this:
http://tinypic.com/player.php?v=25qd...9#.WCo42IVhymE

I will try to do a smoke test since I have not done that

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Edyz7s

I will do this as well, feel like the tps could be going out despite it functioning

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Jefro240

Catalytic converter good? BOV leaking?

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| 92 S13 Hatch | 92 S13 Coupe | 95 S14.5 |

Edyz7s

No catalytic converter, running 3in all the way straight pipe with 1 resonator and 1 muffler at the end
It was leaking before, because the diaphragm was torn. Replaced it with the fake bov diaphragm i got with my piping and used it on my authentic Greddy RS BOV. And it worked. This was awhile back but I don't think it's torn since I hear it go off at high RPMS. Low RPMS it doesnt open as much

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jedi03

timing off or fuel injectors sticking open...

Edyz7s

I have checked the timing awhile back aswell. Compared to the FSM, it was set at where it's suppose to be. My method of checking it was using a spark plug wire connected with a coil and worked. Don't know if the timing goes off track over time..
I checked the injectors by using a screw driver to hear them, they all sound good. The last one near the firewall sounds a tad bit different though.

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Kingtal0n

boost leak test, injector leak inspection

Don't do a smoke test. I dont know how that $#!T got started but its nearly worthless. Fill the plumbing with 15~PSI Of pressure to find the leaks.

For the injectors, If you are using a stock rail, you pull the rail out of the engine and turn the fuel pump on. Any leak will become obvious, and the smell of fuel will let you know if there is even a tiny one (there should be no smell of fuel before, and during, the running fuel pump). The fuel smell is the most sensitive test you can perform because a leak can be so tiny the fuel will evaporate before it can be witnessed. A large leak (bad O-ring) will usually show on the plugs (one of them is much darker than the others) so check plugs first (easy), do the boost pressure test (medium) then bother fooling with the rail (annoying).

Edyz7s

So based on what I have done so far, I feel the car running much better but the misfire and tps lag is still there but to a minimal. I still have not had the time to do a boost leak and injector inspection but will do and respond back with results!

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