MR2 problems have you got the same ?

[f1fx]

Hi All. i have a H plate sw20 with the 3gse or 3sge . engine .. never remember .
when i bought the car it was standard .
and after time i have added single exit exhaust. and a mesh air filter on a pipe taking it down to the side vent.
momo coarse wheels on Goodyear f1's
changed the plugs leads and rotor arm

and all going well. sounds great.
until my fuel has dropped . IM getting 250 miles per tank . and there is a slight pinking . i had the same problems on a previous mr2 same age same mods. but never go around to fixing it.
so my question is .
I assume it need a tune up due to the mods . can they be tuned ?
To correct the fuel consumption .

Has any one had this before? With this kind of mods
if so what was the fix ?

where can I take it that knows these cars . to fix it .. in the south Wales area ?

Thanks in advance

Matt


Hey guys . what mods have you done. im determined to get to the bottom of this . and cure our fuel problems.

1. air filter on a pipe sending it down to the side vent .
2. stainless exhaust single exit drivers side . previous mr2 twin exit system.
same problems
I have changed plugs, leads, dizzy cap , rotor arm. still the same
on my previous mr2 it was pinking.
Im currently on 240miles with just under 1/4 of a tank left "come on 300"

See full story on the mr2 owners club.
http://www.mr2oc.co.uk/ForumsPro/viewtopic/t=78936...

My car does not have an o2 sensor "lambda"

Edited by f1fx on Monday 22 October 09:18

[Bibbs]

First thing, what make is the filter?

If it's not got head shield it could be sucking in very hot air.

The stock airbox is designed to keep hot air out the intake system. Yes filters sound good, but on an MR2 it usually means a loss in power due to the hot air. And if the filter is cheap, you'll be sucking in loads of cr*p and damaging the engine.

BTW - it's a 3s-GE .. 3s is the engine block, GE is an NA performance head.


FE being NA economy, GTE being a performance turbo head, and for the sake of compleatness GZE a performance supercharger head (the 3s didn't ahve a charger, but the Mk1 mr2, 4a engine did).

[f1fx]

Bibbs said:

First thing, what make is the filter?

If it's not got head shield it could be sucking in very hot air.

The stock airbox is designed to keep hot air out the intake system. Yes filters sound good, but on an MR2 it usually means a loss in power due to the hot air. And if the filter is cheap, you'll be sucking in loads of cr*p and damaging the engine.

BTW - it's a 3s-GE .. 3s is the engine block, GE is an NA performance head.


FE being NA economy, GTE being a performance turbo head, and for the sake of compleatness GZE a performance supercharger head (the 3s didn't have a charger, but the Mk1 mr2, 4a engine did).

Its a mesh filter the last filter was a k+n. still the same problem
i have a scoop on that side of the car too . to keep it cool. still the same as the last one !
engine is a 3S GE.

I think that due to the lower vacuum cause of change in filter in that part of the system. one of the sensors may be a bit confused causing over fuel !

Edited by f1fx on Monday 22 October 10:04

[Bibbs]

Overfuel will stop pinking or det, so it'll be underfueling.

Those TOM's snorkles/airfeeds don't do too much, unless you have the TOM's air box too (it was a box closed to the engine bay, and only open to the snorkle. This reduce heat soak, and at speed it would build high pressure in the box gaining more power).

I'd either add some heat shielding around the filter, or put the stock airbox back in.

Or, get an Apexi fuel controller (SAFC / VAFC) and get it tweaked on teh dyno to add more fuel in and get your AFR's back in spec.

[Herman Toothrot]

as Bibbs said, but it could be as simple as your lambda sensor shot. Considering they are only good for 50,000miles it probably is, they are one of those forgotten neglected essential components.

http://www.picotech.com/auto/lambda_sensor.html

[silent k]

Have you could try resetting the ECU? I can't remember which fuse you pull, but that might help

Edit : Just read the original thread, someone's already suggested that!

Edited by silent k on Monday 22 October 13:43

[f1fx]

silent k said:

Have you could try resetting the ECU? I can't remember which fuse you pull, but that might help

Edit : Just read the original thread, someone's already suggested that!

Edited by silent k on Monday 22 October 13:43

Yep tried that .. it the one in the fuse box in the engine bay . Middle one i think .for over 30 seconds . in ambient temp but i have been told this only resets the error codes ! not setting the ecu back factory standard, off a Toyota specialist !

[f1fx]

Herman Toothrot said:

as Bibbs said, but it could be as simple as your lambda sensor shot. Considering they are only good for 50,000miles it probably is, they are one of those forgotten neglected essential components.

http://www.picotech.com/auto/lambda_sensor.html

My car does not have on O2 sensor ! there is not one in the down pipe where they normaly are. and my car did not have a cat on it either !

WHAT U GUYS GETTING TO A TANK ?