still burning too much gas...

[mikeinaus]

skip to page 7 please...

[whitete]

?? What do your spark plugs look like ?? have you used the chart on google for spark plug conditions


any smoke from tail pipe thats not normal ?

how about a small crack in any on the vacuume lines ? possible from intake ?

my milage is around the same to be honest ( but my cyl 5 has a misfire - i know from p0305 code and the fact that my exhaust manifold on that cyl is chrome while the others are all black from the heat !

and the high HC's have you done any research on what it means etc. and what can be made to improve it ..

also mabey try a drive clean center and see if they have some ideas ---it is there job to help us out to --- as its there job to perform the test



keep me posted im intrested to see some results on yours and my KLZE


thanks ,
Terry

[Ryan]

try a stock KLDE ECM...

I thought my milae was bad, but its not that bad.

I get about 400 km on 37L.

[mikeinaus]

are there any klde ecu's that run on the 94 mx3 disty? should i try another k834 ecu with one of my chips? or source a de ecu/maf and disty? i really dont think its the tune. my new chip runs much smoother threw the power band then the probinator did. not that the probinator was bad. i just think the vris was off. around 4000rpm with light throttle there was a noticeable burst in power. im also getting more or less the same mileage since i put in the new chip.

to be honest Ryan. id be ecstatic to run 10l/100km average.

as for vacuum leaks i redid all my vacuum lines a couple months ago. if there is a leak its extremely minor and would have to be in the throttlebody or intake gaskets. i dont remember what the plugs looked like, but i remember they were slightly wet and smelled a bit like gas last time i checked.

i forgot to add that it doesnt burn any oil. i dont need to add any between oil changes anyways. there also isnt any smoke coming from the exhaust pipe under normal circumstances. however when it is cold outside there is a bit of whiteish smoke during idle, which im guessing is unburnt fuel vapor.

high HC levels is usually attributed to unburnt fuel...

[Daninski]

You said your running 'stock 14s, the K8 (GS) was 15". Now I know rim size isn't important but tire diameter certainly is. What size are your tires? I'm just thinking you may be reving higher than you should if your tires are too small and that would cause increased fuel consumption. Not to mention shitty looking wheel fitment.

[mikeinaus]

185 65 14 currently and i was running 205/40/17 in summer. there only 1.7% too small. i doubt they'd have that much of an impact if any.

this is more of an engine/engine management problem. its not like its running ideal. if i had a clean burn and 13l/100km i wouldnt be complaining. its the fact that its not mixing fuel and air properly, or it is not burning it effectively.

lets take rolling resistance, brakes, power loss threw transmission and anything else thats external out of the equation. we need spark, fuel and oxygen. too much fuel is being used. therefore we need to increase spark or oxygen to effectively burn it off, or we need to lower gas flow.

oxygen flow isnt being impeded threw the intake or exhaust setup, perhaps the intake valves have some buildup limiting airflow? if this was the case does anyone know of a way to test or clean them other then seafoam? or maybe my vaf is reporting more airflow then is actually being introduced into the engine? i have a spare je50 i will install tomorrow.

everything in the ignition department has been replaced other then the distributor. seeing as i dont have any other problems indicating lack of spark or a failing distributor we should be able to eliminate this from the equation? i do have a spare distributor and i guess i could give it a try, no harm in trying right?

now on to fuel. we know the pump is priming to 42psi which is in spec. i know the injectors arnt leaking as they will hold fuel pressure for 5+ minutes. maybe one of the injectors electrical switches are malfunctioning? i can test that but its not really worthwhile until i get my intake off when i do my timing belt. i also didnt test my fuel pressure regulator. its possible its holding too much pressure and causing excess fuel spray from the injectors.

so things to test/try:
seafoam again
je50
distributor
new fuel pressure regulator. i could always buy an aftermarket one and just dial the pressure back until i get an ideal burn, but without an a/f ration gauge this is dangerous.
de ecu/maf/distributor

im appreciating the ideas guys. please keep them coming.

on a side note. my fuel rail doesnt hold pressure with the pump off. alldata says the rail should drain to 22 psi after 5 min, mine drains to 2 psi in about 3 minutes. does anyone know where the checkvalve/ return line limiter is? with return line clamped it holds pressure so injectors arent leaking forsure...

[mikeinaus]

i just installed the new vaf. idle/reving seems normal, exhaust still smells of gas. i also checked codes for the first time since i put in the o2 sensors and coolant temp sensor last thursday and im getting code 69. looks like the sensor i bought is a dud or my wiring has a short somewhere. being the genius that i am i didnt save my old sensor. ill email amazon and look into getting a new sensor sent out.

[Mr.mx-3]

Before yesterday when mine compleatly quit running (no spark) I was getting around 250-300 miles per tank but i also have a kl31 ECU. Before I got it I was using my stock K8 ecu an gas milage was horriable at best I would get close to 200 miles per tank but it usually ran between 125-150 miles per tank. Altho I think I may have a plugged injector one cyl is compleatly dry put in new plugs about 10 months ago and one looks brand new like it just came out of the box ecept for the ceramic around the electrode is melted. There's no deposites on the threads like the others and it's been running rough every since I installed the ze which was the same time I put in new plugs. I now know why it felt sluggish and I've been getting my a-- handed to me when raceing bulls--- cars. I've only been running on like 4 or 5 cyl. for the last 10 months. Does this sound like a plugged injector?

[mikeinaus]

could be. have you done a compression test?

id love 200miles a tank. im averaging probably around 250km a tank. looks like grabbing a de ecu might be a good test...

[Ryan]

The chips built by the probe community are for Probes... I think there may a be a small difference, because my chip throws 69 too, whereas my KL55 and K801's do not. I also get s--- milage on my chip.

[Nd4SpdSe]

You keep mentioning chips, but what are you actually running for an Chip/ECU? My Probinator only cost me about 25km per tank compared to my KL36. Were you trying on something other than a JE50?

I wouldnt say it's anything to do with tires/rolling resistance, they wouldn't affect his mileage to be nearly that bad. I was also running 205/40/17.

Temp Sensors also affect mileage. You '94 is a one-sensor one, right? Maybe your chip is looking for a 2 and is throwing things way out of wack. Normally it would only cause the rad fan to be on all the time, but maybe with yours it's more than that?

Wonder if an HEI mod would help...What you running for spark plugs?

[Ryan]

Oh, thats probably it.

Nd4Spd, you jogged my memory, code 69 is a coolant temp sensor code.

Op, does your rad fan run 24/7?

[mikeinaus]

Ecu is a k 834, and I have the unique tot7271(?) Disty I believe. Original chip was probinator new one was custom made for my specs. Something to do with the chip needed the 93 coolant sensor. Both chips have needed it and I have been using one as long as Ive had the car. I got a new coolant sensor thinking the old one was out of spec. New one is a dud and replacement is in the mail. Ice only ever tried je50

[Daninski]

That would be TOT57171 for 94. There is no work around for the extra sensor if the chip is looking for it. Installing the extra sensor takes about 10-15 mins, you just have to plug the neck with a rag as well I used a shop vac to ensure all the drillings were captured. Then you drill and thread then install the sensor on the flat portion of the neck. Easy peasy.

[Nd4SpdSe]

Question is, where do you run the wire to?