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janek
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 Posted: Fri Mar 18, 2005 8:53 am Post subject: How to test for a faulty MAP sensor |
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i need some help, i have a feeling my map sensor is rooted, i am pulling 18-22l/100km, new leads, new plugs, new oil. it has nothing to do with my driving, because the easier i take it, the more it guzzles. (the car has never been close to the redline whilst ive owned it).
this is really pissing me off. 50 dollars of fuel gets me 220 km. WHAT THE HELL!
so anyone with any experience, or who can offer some help, please, please post!
the car is a 2000 au2 fairmont vct. the economy was bad before, but worse now. |
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4.9 EF Futura
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| Posted: Fri Mar 18, 2005 9:01 am Post subject: Re: How to test for a faulty MAP sensor |
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| janek wrote: | | , i am pulling 18-22l/100km |
Hehe, welcome to my world.
Nah, seriously.... It may be that you have a vacuum leak. Id recommend getting a vac gauge on there, should be around 20inches/hg at idle.
Alternatively, disconnect the MAP sensor... if there's no change then fair to assume the MAP aint doing much.... |
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madmax
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| Posted: Fri Mar 18, 2005 9:48 am Post subject: |
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| I had a MAP sensor fail on my EA. We found it was the problem by swaping it with one off another car. |
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voxace
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| Posted: Fri Mar 18, 2005 10:06 am Post subject: Re: How to test for a faulty MAP sensor |
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| janek wrote: | | am pulling 18-22l/100km |
Yeah, same here too. I hear ya!
Still trying to sort it out myself.
I have been absolutely babying my car over the last few days. Premium fuel, New spark plugs, oil, air filter, fuel filter, ISC gasket, throttle body gasket and the trip computer reads 21.3 goddamit!
I've bought an intake manifold gasket and will be replacing that when I get time, and then leads after that. Grrrr.
Wish I could help...lol... |
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ghiaman
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| Posted: Fri Mar 18, 2005 2:13 pm Post subject: |
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I thought my AU VCT mtr was bad at 14L per 100ks.
I replaced my aftermart BMC panel filter to a new ryco one and the display on the C/C panel reads between 11.7 to 13.5 around the city and 9.0 to 10.5 on country driving now. I keep the economy on the tranny all the time on. I average over 450+ on a tank around town & sometimes over 700ks country driving. I think the AU VCT mtrs should get about 400+Ks around the city if things are running correct.
ghiaman |
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janek
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| Posted: Fri Mar 18, 2005 2:36 pm Post subject: Re: How to test for a faulty MAP sensor |
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| 4.9 EF Futura wrote: | | janek wrote: | | , i am pulling 18-22l/100km |
Hehe, welcome to my world.
Nah, seriously.... It may be that you have a vacuum leak. Id recommend getting a vac gauge on there, should be around 20inches/hg at idle.
Alternatively, disconnect the MAP sensor... if there's no change then fair to assume the MAP aint doing much.... |
bingo, i did that after i fixed the sticky accelerator... strange phenomenon |
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janek
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| Posted: Fri Mar 18, 2005 2:38 pm Post subject: |
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| ghiaman wrote: | I thought my AU VCT mtr was bad at 14L per 100ks.
I replaced my aftermart BMC panel filter to a new ryco one and the display on the C/C panel reads between 11.7 to 13.5 around the city and 9.0 to 10.5 on country driving now. I keep the economy on the tranny all the time on. I average over 450+ on a tank around town & sometimes over 700ks country driving. I think the AU VCT mtrs should get about 400+Ks around the city if things are running correct.
ghiaman |
my reading has only ever been below 18.3 on the highway when i reset it. its really pissing me off now. im wanting to go for a stage 3 or 5 its performance kit, taht way at least i have an excuse to be such a pig. at the moment i am going to try resetting the ecu as well.. disconnecting the battery do the trick? |
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voxace
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| Posted: Fri Mar 18, 2005 2:57 pm Post subject: |
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One thing I have noticed with my car. Accelerating the instant fuel consumption seems to be the same as my mates almost identical car. The main difference seems to be when cruising or backing off.
When he is crusing he can have the thing sit on about 6 L/100km and when backed off it goes right down to 1-2 L/100km.
Mine seems to hover at about 8-9 L/100km when backed off and will cruise at around 11 L/100km!
So obviously it is injecting fuel when there is no need, something has to be causing this.
Does yours do the same thing when you have it set to "Instant L/100km"? |
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janek
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| Posted: Fri Mar 18, 2005 3:27 pm Post subject: |
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pretty much... most of the time, the inst is 11+, when im cruising in the city its NEVER below 9, normally 11-13, highway, 8-14.
i havent paid much attention other than that, but will find out.
as for ecu reset, i have disconnected the battery and am waiting, anything i should be wary about when restarting it? |
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Dellboy999
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| Posted: Fri Mar 18, 2005 3:31 pm Post subject: |
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| The only thing when reconnecting will be the radio code, and it will idle a little rough till it learns. |
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4.9 EF Futura
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| Posted: Fri Mar 18, 2005 3:35 pm Post subject: |
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| janek wrote: |
as for ecu reset, i have disconnected the battery and am waiting, anything i should be wary about when restarting it? |
Yeah just turn the steering wheel back and forth a bit, put it in D (if auto) and N for a bit, turn aircon on/off a couple times.... just so the ECU knows what to do when these loads are placed on the engine. |
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janek
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| Posted: Fri Mar 18, 2005 4:12 pm Post subject: |
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| will keep you posted, but shouldnet be expecting any major issues? |
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janek
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| Posted: Fri Mar 18, 2005 4:55 pm Post subject: |
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ecu reset seemingly ok. will be taking it out for a test soon. the map sensor is the unit which bolts onto the throttle body, correct, 2 phillips screws hold the unit in place, a 3 pin plug connecting it to the harness?
if the ecu reset doesnt help, ill see if disconnecting the map sensor completely and see if that has any effect. |
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voxace
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| Posted: Fri Mar 18, 2005 5:02 pm Post subject: |
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| No the MAP sensor is on the firewall, and has a little hose going to it |
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janek
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| Posted: Fri Mar 18, 2005 5:13 pm Post subject: |
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hmm... any chance of a pic?
then what does that thingmy do? i disconnect it @ idle, the idle jumps 2-300 rpm.
will post pics in about 5 min |
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janek
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| Posted: Fri Mar 18, 2005 6:08 pm Post subject: |
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if anyone an show me the approx location of the map sensor, and explain what the circled is, it would be much appreciated. i am rather new to efi setups, but am quite experienced in everything carby :S |
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janek
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| Posted: Fri Mar 18, 2005 6:10 pm Post subject: |
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| PS. please excuse the hugeness of photos, didnt realise! |
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voxace
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| Posted: Fri Mar 18, 2005 6:21 pm Post subject: |
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Well I can't see it in the pic, but in the E-series it is right next to the washer bottle on the firewall basically. It's probably there on an AU too somewhere.
The thing you have pointed to is the throttle position sensor. |
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janek
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| Posted: Fri Mar 18, 2005 6:23 pm Post subject: |
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if thats the case, then if i disconnect it, why does it still rev when i hit the accelerator?
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mspw
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| Posted: Fri Mar 18, 2005 6:53 pm Post subject: |
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Throttle position sensor and idle speed controller.
its an auxilary device that automatically adjust throttle to maintain idle (such as when your engine is cold) and to adjust throttle according to load (power steering / aircon) ect.
Last edited by mspw on Sat Mar 19, 2005 8:48 am, edited 1 time in total |
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