din ding! round 10! trying to fix the luce...AGAIN!

[laner]

Hey guys, Long time since ive been here..

still have my luce.

its been sitting in the shed for over 4months now because i just got tired of looking for the prob and was thinking about getting her out tommoow for another look.

just thought id throw some vague questions out there to see if anyone would have any ideas.

its a jft btw

ill briefly explain what the symptoms are..

# when slowly rising the revs in nutural it gets to 3500rpm and drops and if i hold my foot there where it drops it rises and falls about 1000rpm at a cycle of about once every 2 seconds..(imagine a sort of fuel cut at 3500rpm but slower)

#sometimes the car runs well, but most of the time under acceleration there is little or no acceleration. and its r ough as guts!
at other times it is normal.

sometimes it will not fire, it will kick over but wont fire and when it does its very hesitant.

any kinds of hints would be heaps appreciated...maybe im overlooking something and just havnt thought of the problem.



k, well it use to run great for months after i bought it and just out of nowhere i satrted having all sorts of probs that i always assumed was the fuel system...well 4 different fuel pumps, 3 different pressure regs later im still having the problem...

Later to my surprise i found a whole lot of water sitting in my fuel tank (wether this was from someone who dosnt like me or some sort of a leak im not sure) so i drained the tank and replaced the fuel. hmmm still having probs galore! and it seems to get worse the hotter the car gets...so i started looking at sensors... so after an hour of looking at sensors, i realised that just looking at them isnot going to help i figured id actually have to do something to test them other than staring at them, then i realised i have no idea how to do that or what sensor it would be.....

k, also im having troubles with my auto.. it shudders when changing back gears usually at high speeds when i go to overtake and backoff when it clicks to a lwer gear after acceleration i get a huge shudder through the whole car and its evident that its the box..would this somehow creat the symptoms above?

what would indicate the turbo being buggered?

anyone have any ideas where to go next?
im actually for the first time in my life thinking about taking it to another mechanic (with MUCH reluctance, cuz we all know how useless they realy are...lol...even though i use to be one) or maybe a dyno.

thanks for any help in advance

cheers guys


LaNeR

[sim_rx3]

first things first..

give it a MAJOR service.

replace ALL

spark plugs
spark plug leads
distributor cap
air filter
fuel filter
oil filter
replace ALL oils engine/gearbox (might as well do the diff while ya at it)
id probably even get ya box serviced at a proper auto transmission mob. they will change the internal filters etc inside the auto.

then replace o2 sensor(s)

remove air flow meter clean with some carby cleaner in the intake area and make sure the flapper inside moves "freely" and doesnt bind up or get stuck. then reinstall

remove throttle body, clean with some carby cleaner in the intake area, wipe with a rag clean. make sure the "butterfly" inside moves "freely" and doesnt bind up or get stuck. then reinstall.
if you know the values of the TPS sensor test it to see if its ok as its a common cause of smoothness reving up engine issue

also check ya throttle cable ie when your foot is flat to the boards is the throttle body at full wide open position?

this is a start at least..

[laner]

if you know the values of the TPS sensor test it to see if its ok as its a common cause of smoothness reving up engine issue[/b]

Hey, thanks for the suggestions sim_rx3

About the TPS.. whats the go with setting it right? does anyone have the settings and procedure? or documentation or a link to find it?would this singlehandedly cause the all above mentioned problems cuz' i know this was one of the things a mechanic said was a prob and had a play with and thats when the up/down revving occured. and if i can get rid of that as a start id be 90% done i recon after doing a full service.

also, is there any idea where id get a dizzy cap in Australia? ive got a wrecker here that has one for parts but for the dizzy cap id like to go new but will go 2nd hand if they are imposible to find. i really got tired really quickly when asking a parts dealer for "x" part for a mazda luce and getting a reply "oh sorry mate, did you say something?..i was jusst daydreaming about a car IVE ACTUALLY HEARD OF!" lol or "did you just call me a luce?!"

Im wanting...no correction..NEEDING to do a manual swap in it soon so ill leave the auto till last as i did a service on it already but i think its just plain rooted. (so ill have to do a readup on that one cuz i understand its VERY hard)


thanks again

LaNeR

[sim_rx3]

no probs

over time if they wear out the risistance value isnt linear any more.

mine did it but it had an open circuit inside it. so id get to so much throttle and the ecu wouldnt see the tps then default to the factory default setting and just limp. ie major decerleration

as for a manual good luck..

you will only ever find one in japanese and even then they are rare as..

i've opted for getting rid of the original ecu and using a Haltech e8 with patch loom (so plugs into original ecu plug/loom and needs no rewireing) so that gets rid of the tps adjustment issue as you can dial the ecu to 0% throttle when the throttle is at fully closed.


but i dare say this missalighnment with the TPS could be partor all of your issue as well. ya mechanic should have left the dam TPS alone until he had the description of how to adjust.

if you had a rotary Luce it could have blown the engine if its leaning out at all..

also start searching this forum im pretty sure its posted somewhere how to adjust it..

plus cause we have such rare cars unfortunatly i think you will find mazda will be your only supplier of dizzy cap.

or try mazdaspeed929 off this forum to see if he can get it from korea as we are finding cheaper parts there that are mazda release/ or aftermarket equivilant.

[mazdaspeed929]

A major service is a good call then fix the other stuff because it is hard to diagnose them properly if the car isn't running right.

If you need something parts cheap I can get it in KDM for you. Or custom stuff, too. Is the JF-T dizzy the same as the 3.0 SOHC dizzy?

[boostomatic@live.com.au]

Hmmm sounds like you have some bad stuff going on there, make sure you give the AFM a good clean and check all the pins are ok in the plug. Sounds a bit like the ecu is not getting a good signal from the AFM and thats why you can bring the revs up a little on the base idle map but as soon as you crack it open it goes way lean and wont rev. Had a similar thing on my 626 turbo when pissing around trying to get some more k's per tank out of it and did not hook the AFM back up properly and same sort of thing was going on till i worked out what a dik i was and fixed it. Hope this helps and might be worth getting a spare AFM to do a quick test.

[Matsuda 9]

JF-T Dizzy only matches the 90-91 sedan models with SOHC (the car has black trims instead of chrome). also the dizzy has/should have blue stickers JF-07 part number from memory.

but that's for Australian car comparison.

[laner]

Ok so i tried another 929 AFM and no avail. in my search for a test AFM i thought it was interesting to note that the kH/KF Laser AFMs are VERY similar. Still trying to hunt down some parts to test other things, but ill keep posted on the prob.

definately not a tech question but....why do all your bills come at the same time ya wanna fix your car?? lol

[Matsuda 9]

GD mx-6/626 turbo/telstar turbo will work (not sure how it affects mixtures through)

tried it in the past and it worked