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[PLANETNZ]

Hi guys


my question is, with my car (99 2.5 fl) generally is a low voltage code 73 a stuffed maf of something else down the line?

The weird code 73 developed the other day after i had the car parked on a rather steep up-hill incline.
immediatly after starting and backing down the hill the car started running like a POS. managed to coast down the hill left it for a bit tried re-starting and still running like crap.
Dissconnected the MAF and away it went, ran heaps better and weird part was the MPG went down IE; much better! I figured at the time maybe some oil residue or something from being on the hill had contaminated it somehow
A few days latter I removed it (maf) and cleaned with circuit cleaner, blew it off (quitely) with compressed air. Plugged the obd into the laptop "code73" cleared it ran it again still there (after a couple of times)
The maf voltage is .11V and very little movement in the intake vacumme
Would the fact there is movement and voltage mean that the maf is Ok and its possibly something else??  I cant find and vacuum leaks etc.  Also, would the "improved" mpg shown on the computer be because the maf is now unhooked??

i have of course searched through here and still are but maybe someone has come accross this before!?

Cheers

boycey

[PLANETNZ]

..just on the mpg, the car generaly runs about 8.5 k/pl but occasionaly runs down to 7.1 (about 18mpg) this is general around town running avr speed is 22kph.
The car has has new / recent dis pack, leads, plugs, breathers icv cleaned etc etc. I kinda figured at the time one of the o2's was getting a bit lazy.
until 2 years ago the car was immaculate but after our roads here have turned into goat tracks after a couple of good earthquakes its kinda gone down hill a bit.
Since then the cats have also been removed after the exhaust system has had more hits than Elvis. 
Would a malfunctioning maf cause the poor mpg or do they just fail rather than play up?, could it (maf) have been doing this for a while??
open to ideas!

[noel]

i would say your maf needs replacing tbh,and as for cleaning it that's not always a good idea as they are very sensetive.
had a similar fault with mine changed maf for a genuine bosch one problem sorted

[symes]

mate I reckon you got same problem I had-MAF is failing  Unfortunately would not recommend anything -except fitting another MAF-Bosch-not cheap pattern part as they last days only

[TheBoy]

Do you have the facilities to read the live data, as the ECU reports it?

If so, post up the idles kg/hr reading...

[dbug]

Replace the maf mate - cleaning it is usually the kiss of death for it mate

[symes]

Replace the maf mate - cleaning it is usually the kiss of death for it mate

+1

[Kevin Wood]

Check for intake air leaks before changing anything. Remember, the code is telling you that the value from the MAF is lower than engine operating conditions suggest it should be - not that the MAF has failed!

[dbug]

Probably has failed now - op cleaned it

[Kevin Wood]

Probably has failed now - op cleaned it

Could well be.

[PLANETNZ]

yea yea i know..i cleaned it my fault!:)  so do these things just crap out or can they play up??. One of the reasons im asking is the fuel economy "seems" to be better now!

IE: was this a fault thats been there for a while and not shown until now??

[Kevin Wood]

They do tend to deteriorate over time. Eventually, the ECU has wound too much fuel trim on to compensate that it starts raising codes and that's when the symptoms start because it has reached the limit of fuel trim.

Having said that, the non-DBW MAFs tend to be moe reliable.

[PLANETNZ]

Cheers guys, im going to plug the laptop back into it today and see if any of thereadings make any sence but with a cracked screen and and now this its about to get parked up as the cost to repair isnt worth it.
 Im thinking about (seriously) coming over and chucking a couple of Mercs / bmw's into a container and shipping them back here as they are half the price in the UK at the moment!
one question, has anyone posted or thought about posting a set list of "normal" parameters rather than just in individual topics?
Cheers

[TheBoy]

As Kevin Wood implies, 2.5/3.0 MAFs tend to be pretty robust, far more so than the 2.6/3.2 ones.

The fact you've cleaned it, it probably does need a mew MAF now anyway, but that might not be the root cause of the problem.

[symes]

Check plug on EGR-this can cause your code problem-if you change MAF and still same