RETed

1) Fuel delivery is inconsistent.&nbsp Check the usual?&nbsp Fuel pump, both fuel filters, fuel injectors clean?

2) The loud backfire could be signs of a bad TPS.&nbsp Check resistance at WOT to see it doesn't go over 6k-ohm to 6.5k-ohm.


-Ted

Dave-ROR

Sup Ted. TPS is good. Injectors could probably use cleaning but going to replace the secondaries with larger injectors anyways but will get the primaries cleaned. I have a spare set of injectors too, maybe I'll see if any of those work better. Going to replace the pump with a walbro unit and replace the filters. Mazda OEM only or discount for the filters?

RETed

I rely on Mazda OEM.&nbsp Fram does make an aftermarket "high pressure" (i.e. firewall) fuel filter for about $10 less if you're on a budget.


-Ted

Dave-ROR

Going to be putting a Haltech EK6 in it so the $10 isn't going to break the bank. Granted it's not a super high budget, but 3k has been allocated to this project unless we need it elsewhere.

It was more of the convenence factor than price. :P

Ryde _Or_Die

Alright thanks. Have any idea around how long it usually takes?

Dave-ROR

Depends on what you have to tune. I'd cal lJohn and talk to him, he'd know that better than I would.

Ted: Checked the TPS again and put a ground wire on the UIM. TPS is ~.995->1.050k ohm closed and warm, 6.16-6.18 at wot. going to try to find a spare asap.

The car runs the same with or without the pressure switch plugged in :shrug:

And still idles on one rotor. Going to try to find spare sensors and stuff this weekend at the junkyard.

Dyre

Is anyone else impressed by how much hp your making to the ground at 7psi???
I sure as hell am.

Dave-ROR

I am. As far as I can tell the motor is basically stock (EGR blocked off, open stock downpipe, it does have a k&n filter, but that's it) but I haven't exactly taken it apart to check for a streetport either. I know the previous owner got the motor from a japanese engine importer and never touched it so if it's been touched it happened in japan :shrug: The motor does have astonishingly (sp?) good compression, 8.6kg/cm2 front and a little less in the rear rotor.

This weekend is going to be busy. First hitting the junkyard for a TPS and some pressure switches. A few gauges from the junkyard and some other sensors too. Whatever worthwhile spare parts I can find. Then going to tear it apart and replace the LIM and UIM gaskets, change the fuel injector clips, test all the sensors, replace the o2 sensor (it's throwing a code), etc.. should be fun :P

Ryde _Or_Die

While doing all that you might as well have the injectors cleaned professionally. I'm sure theres some local places for it to be done.

Dave-ROR

We actually have a spare set of injectors that I am trying to find for that purpose :P

RETed

Yeah, that WOT resistance spec is borderline.&nbsp At those readings, it might or might not contribut to high RPM hesitations.&nbsp In comparison, a brand new TPS specs out under 5k-ohm.&nbsp As the TPS ages and wears, the resistance starts to climb.&nbsp Anything under 6k-ohm should still work good, but it gets suspect over 6k-ohms.

Good luck!



0Ted