Fired once and not again!!! help!!

**tiang** · 02-01-2007, 01:16 PM

good point. It's probably running 80octane by now, or solidified.

**Wildsupra** · 02-01-2007, 05:02 PM

haha, tiang mate didnt you fill it up with new fuel?

when i came round to fix the starter motor for you it was reading empty, but now reads close to full???? did you actually put any fuel in it? or is the gauge being funny and maybe we actually have no fuel at all???

Wow that would be hilarious, cos i only assumed you filled it up to get the gauge reading so high??

Matty

JP · 02-01-2007, 05:25 PM

what did you do for the mounting of the MAF?

If you used a custom pipe larger than 2.75" in diameter that could be the cause of your idle problem.

**o_man_ra23** · 02-01-2007, 05:31 PM

Originally Posted by JP

what did you do for the mounting of the MAF?

If you used a custom pipe larger than 2.75" in diameter that could be the cause of your idle problem.

WTF is an MAF?? Do you mean Mass AirFlow Meter?? Or Manifold Absolute Pressure Sensor??

Cheers, Owen

EDIT: if its got to do with anything on the intake side of things, 2.75" seems pretty restrictive for a 9000rpm engine.

**Wildsupra** · 02-01-2007, 05:54 PM

The MAF sensor is mounted in a piece of alloy pipe about 2 3/4 inches diameter, its the perfect size for fitting into the origanal rubber pipe, so i would assume its pretty much bang on right size.

I think i'l double check we got fuel in the tank first anyways, that could explain all of my problems ive been having, well most of em.

Matty

**2jzhilux** · 02-01-2007, 06:51 PM

Originally Posted by tiang

very persistant bastard this Wildsupra

.

Ecohilux, So how can you read the codes that come out of the ecu without the diagnostics tool?

go to the connector /diagnostic plug near the brake pedal on the lower trim
get a piece of short wire/split pin short out the tc terminal pin 13 and cg teminal pin 4
and then count the flashes of the engine light like normal
if you get codes and need to know what they mean let me know i will find out

**tiang** · 03-01-2007, 07:38 PM

Originally Posted by Wildsupra

The MAF sensor is mounted in a piece of alloy pipe about 2 3/4 inches diameter, its the perfect size for fitting into the origanal rubber pipe, so i would assume its pretty much bang on right size.

I think i'l double check we got fuel in the tank first anyways, that could explain all of my problems ive been having, well most of em.

Matty

...i clearly remember fueling up to full on the day the engine blew (13 months ago) because i always have full tank on race day. of course it could ahve all leaked out by then. i also noticed the gauge hitting 50% when the body was powered up, so i didn't think it'ld need any more fuel.

the intake is the right size, although bigger would be better.

eco, thanks for the tip....I think an odb2 scanner would be a worthwhile investment too.

**o_man_ra23** · 03-01-2007, 07:51 PM

Originally Posted by Wildsupra

The MAF sensor is mounted in a piece of alloy pipe about 2 3/4 inches diameter, its the perfect size for fitting into the origanal rubber pipe, so i would assume its pretty much bang on right size.

Ok, so again I ask, WTF is an MAF??

Cheers, Owen

**Forcefed6** · 03-01-2007, 08:12 PM

Originally Posted by JP

what did you do for the mounting of the MAF?

If you used a custom pipe larger than 2.75" in diameter that could be the cause of your idle problem.

MAF I would say id Mass Air Flow Sensor.

As for the pipe being the cause of the crap idle, I recall a tread with Billzilla having similar issues on a 3sge. He had a pretty crude solution to fixing the problem, but it seemed to work.

Link to the thread I am reffering to.
http://www.toymods.net/forums/showth...ghlight=straws

I also recently seen a subaru that had a crap idle, and seemed that it was caused to a TOO DIRECT flow of air to the MAF. This was fixed by adding a 90 deg bend in ton of the MAF. Cleaned the idle up heaps.

Also, old fuel wont help either.

**BeRad** · 03-01-2007, 08:13 PM

I guess their talking about the afm, but the wire one. i still call it a afm but ive seen it called a maf..

all this terminology thank god for the new thread

JP · 03-01-2007, 08:18 PM

the celica guys using 3" pipes for the MAF have done a few things to get the car running, including welding plates into the pipe to direct the air through the sensor, and even to the extent of machining up a billet MAF housing with the straighteners built in.

If the fuel has been sitting in the car for 12 months, drain it out and put fresh stuff in. The old fuel that was in my wagon that had been sitting for 18 months didn't resemble fuel at all when it came out, was more like shellite.

**BeRad** · 03-01-2007, 08:30 PM

3sgte has a gated afm, so it doesnt matter.

well some of them haha.

the pipe he has put the sensor in is the same diamter as the orignial piping so it shouldnt be a problem, simple answer is to put the sensor back in the old housing for a bit and see if it solves the problem.

**o_man_ra23** · 03-01-2007, 10:09 PM

Originally Posted by BeRad

I guess their talking about the afm, but the wire one. i still call it a afm but ive seen it called a maf..

all this terminology thank god for the new thread

Yeah, I call it an AFM too. Anyways, the hotwire MAF/AFMs use the velocity of air going past them cooling the wire and thus changing its resistance to detect the volume of air passing it. I think electrically they use a wheat-stone bridge, or similar measuring circuit to calculate the resistance change.

So, in calculating this, there are 3 variables. Cross sectional area of the pipe... which in this case is kept the same as factory, so it should be out of the equation. Temperature of the air coming in... which should be compensated for by the air temp sensor (make sure this is not being interfered with). And finally the velocity of airflow. Velocity times area = volume per unit time, and as stated the resistance measurement will be affected by air temp, and the computer will compensate with feedback.

So, from this, I would say after you renew the fuel, if you still have problems, try cleaning the air temp sensor, it may have dust etc on it from sitting which will affect it.

The 90 deg bend theory may have had an effect on the air temp sensor placement.

Cheers, Owen

**2jzhilux** · 03-01-2007, 10:32 PM

i think the rough idle could be caused by the air flow meter not getting correct readings
if you have a look in the stock pipe/air filter lid there will be a white piece of plastic that sits on the end of the pipe(looks like a cheese grater)
this is to reduce induction noise and to stabilize the air as it enters the air flow meter
i have removed this piece of plastic before on a 2zz/1zz thinking it was an intake restricion only to come back and put it back in due to rough idle

**MR22ZZ** · 04-01-2007, 11:48 AM

just saw this thread, been on holidays, But awesome work getting it going. There is a guy over here who's done the same thing though I think he used a Celica engine.

Have you stuck with the 5 speed box from the MR2 or put the 6 speeder in? Because the car will feel a little lifeless between gears with the 5 speed as the ratios are out of whack for the narrow powerband.

JP is correct, the MAF sensor if designed to run with a 70mm inlet pipe and there have been issues with using a 3 inch pipe.