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Guzzling Fuel Like Beer...

_x_FiReStOrM_x_

By _x_FiReStOrM_x_,
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_x_FiReStOrM_x_ Community Regular

_x_FiReStOrM_x_

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Posted

Hi guys,

I'm currently trying to figure out why my car's running so damn rich.

Had it tested on a wideband the other day, the results were an AFR of 11.5 @ idle, and the ratio didnt flutcuate with revvs either.. just sat on 11.5-11.6. :s

Does anybody have an idea on what would cause the car to run so rich?

I've changed the O2 sensor, to no avail. Reset ECU. Cleaned a shitload of sensors and plugs. Cleaned AFM.

Would a dodgy TPS cause the car to run rich at all?

Next up is the coolant temp sender. Does anybody know of a common part that i can use to replace it with? Or do i have to be on a 3 day waiting list to order a 'skyline' one.

Cheers, Phil.

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RB30-POWER Mentor

RB30-POWER

Posted
Posted

If you don't have a service manual with the specs to test sensor with a multimeter get a consult scan cable and software and check the realtime values are what they should be, particularly coolant temp, afm etc.

If it looks in spec, check the fuel pressure, as you may have a blocked return line or the return/feed lines on back the front of the fuel pressure regulator.

If everything is standard, confirm you have the correct injectors on the engine and check the ecu hasn't been tampered with. Someone may have thrown bigger injectors in without upgrading ecu in the past, or removed a chipped ecu without changing back to standard injectors. Just some stuff you have to check on imports as you don't know what has been tampered with during its life.

_x_FiReStOrM_x_ Community Regular

_x_FiReStOrM_x_

Posted
  • Author
Posted

Hey mate, thanks for your reply but i'll no longer have to worry about this problem.

Just for the record, I did do a fuel pressure test and everything was up to spec.. ecu and injectors looked stock too.

Umm but yeh.. car was written off a couple of days ago unfortunately *sigh*. I had only previously owned it for 3 weeks. I was T-boned by an elderly lady at a T intersection. She failed to give way.

Luckily the car that was behind hers was an unmarked police vehicle... what better witness to have.

Worst part about the whole incident is the inconvenience. I'll be without a car for about a month until evverythings sorted out. And as always, i'll end up worse off...

So another skyline gone to car heaven... :rolleyes:

Just out of curiosity, does anybody know the average book value for a 32 gtst? I cant seem to find any for sale for under $10k. Hopefully the payout's decent enough for me to be able to afford another skyline; as i have a heap of brand new parts sitting here that i never got to install. (Heavy duty clutch, racing timing belt kit, boost controller, etc..)

If all goes to plan, i'll hope to buy it back from insurance and part the car out. So keep you eyes peeled in the F/s section guys.

mad082 Grand Master

mad082

Posted
Posted

firstly, how many litres are you talking about? not just full to the empty light on. if you had a faulty sensor you may have had the light coming on while you still had 20L in the tank.

but there was obviously something going on if your car was running so rich at idle and low load. do you know if the ecu had been remapped? it may have had closed loop taken out of it, so it only worked off the mapping.

Lachlan33 Community Regular

Lachlan33

Posted
Posted
Hey mate, thanks for your reply but i'll no longer have to worry about this problem.

Just for the record, I did do a fuel pressure test and everything was up to spec.. ecu and injectors looked stock too.

Umm but yeh.. car was written off a couple of days ago unfortunately *sigh*. I had only previously owned it for 3 weeks. I was T-boned by an elderly lady at a T intersection. She failed to give way.Luckily the car that was behind hers was an unmarked police vehicle... what better witness to have.

Worst part about the whole incident is the inconvenience. I'll be without a car for about a month until evverythings sorted out. And as always, i'll end up worse off...

So another skyline gone to car heaven... :thumbsup:

Just out of curiosity, does anybody know the average book value for a 32 gtst? I cant seem to find any for sale for under $10k. Hopefully the payout's decent enough for me to be able to afford another skyline; as i have a heap of brand new parts sitting here that i never got to install. (Heavy duty clutch, racing timing belt kit, boost controller, etc..)

If all goes to plan, i'll hope to buy it back from insurance and part the car out. So keep you eyes peeled in the F/s section guys.

Am i the only one that thinks drivers over 65 should have to have E plates (elderly) and driving restrictions? I mean we P platers have all that because its accepted that we are less experienced drivers who are more likely to crash. But so are old people. They have experience sure but they have the reaction times of turtles. Funny thing is though is that the second you even sugest such a thing they would be up in arms about how they have been driving for 50 years and never had an accident bla bla bla. I was in the car with my grandmother once. She put her purse over the handbrake and drove off (forgetting to let the handbrake down of course). We then stopped at an intersection, she asks if its clear my way. I say 'no' and she drives through, gets honked at, turns too wide and mounts the gutter on the other side then continues down the street with her handbrake making a groaning noise from still being on.

Anyway I feel for you man, thats gotta really suck!

_x_FiReStOrM_x_ Community Regular

_x_FiReStOrM_x_

Posted
  • Author
Posted
firstly, how many litres are you talking about? not just full to the empty light on. if you had a faulty sensor you may have had the light coming on while you still had 20L in the tank.

but there was obviously something going on if your car was running so rich at idle and low load. do you know if the ecu had been remapped? it may have had closed loop taken out of it, so it only worked off the mapping.

I'm guessing it was basically a whole tank, as it always took $60+ odd dollars to fill it up.

Afaik, the ecu was stock (as the rest of the car was, bar exhaust); the casing looked to be unopened and couldnt see any other signs that it had been removed or even touched.

Lachlan33, my ideal solution would be that drivers over the age of 60 should have to re-sit their license tests at least once every 5 years or so. I'm totally OVER old people being on the roads!! it sickens me. This week alone i've had almost another 3 incidents involving the elderly. Two occurred on roundabouts, where the elderly driver did not check for traffic and just went ahead, causing me and other drivers to have to brake suddenly. The third incident, a senior citizen began to cross the road right in front of me, without looking... causing me to lock the brakes and skid to a halt (in mums car). She then stared at me with a displeased look, and i saw her muttering something...

I'm just plain sick of it...

They call P platers the unsafest drivers on the road for 2 main reasons; 1, they claim we are the most unexperienced. 2, they look at road accident statistics and see that the highest % of accidents were by P platers.

What they fail to see is that a rather high percentage of accidents caused by P platers involve only one vehicle, (usually a commodore... uleh) and are the result of an unexperienced driver pushing their car past its limits. Its the elderly accidents that in 99% of cases involve a 2+ car colission, which puts the rest of the community at risk. At least P platers will only disadvantage themselves when crashing, not others.

Dantay Rising Star

Dantay

Posted
Posted

haha Lachlan good story i agree with you 100% E plates are a good idea.

on the North side of Brissy on Bribe Island they issue a Bribe license to old folk. they can only drive on the island not allowed to cross the brige to the main land. haha dodgy.

Firestorm, wow thats bad fuel eco i would have been crying if i got 200K's from 60Ls i know life starts at a litre a minute but not quite that way haha

_x_FiReStOrM_x_ Community Regular

_x_FiReStOrM_x_

Posted
  • Author
Posted
Firestorm, wow thats bad fuel eco i would have been crying if i got 200K's from 60Ls i know life starts at a litre a minute but not quite that way haha

Haha yeh... don't worry i'm used to the economy, my previous car was a TS magna 4cyl auto. lol

Nah the magna was surprisingly decent on fuel. It returned consistent 400-450km per tank, which was around 40-45L from full until the empty light would illuminate. The fuel gauge sender was poorly designed in them, so you still had around 15-20 litres remaining when it showed empty...

_x_FiReStOrM_x_ Community Regular

_x_FiReStOrM_x_

Posted
  • Author
Posted
i had the same AF ratio - air leak in the system. Turned out to be cooler piping not attached properly.

Just for the sake of other users (for future reference)...

Suave, wouldnt the vacuum leak cause a lean air fuel ratio?

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