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Bad Idle and Fuel Consumption 

 

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 Post subject: Bad Idle and Fuel Consumption
Posted: Mon Sep 05, 2005 11:38 pm 
Tyre Shredder
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Age: 37

Posts: 327

Joined: 6th Nov 2004

Ride: EL XR6

Location: Sydney
NSW, Australia

Ok guys I have two problems atm.

My car has developed a really bad idle. It keeps on jumping around between 750 rpm and 500 or lower. I don't think the ISC needs adjusting becuase when the needle reutrns it stays on 750 for about 1-2 seconds then jumpos again. I have been reading the manual and it says to check the TPS. "A broken or loose TPS can cause intermitten bursts of fuel from the injectors and an unstable idle becuase the PCM thinks the throttle is moving". I have checked the voltage (according to the manual) coming through the wires and all appears to be fine. Is there a way to test the sensor it self. I am thinking just to perform a diagnoistics and maybe it can give me an answer. You can also feel some hesitation while driving but as soon as I put my foot down on the accelarator it disappears.

My second problem is my fuel consumtion. Ok I I have an EL XR6 and I am aware that the diff ratio is 3.45. I did mostly highway work on the weekend up and down from the blue mountains. I put in a full tank of fuel and I am just under a quarter at the moment and I have only done 385kms. When I sit on the highway I am usuallly crusiing at about 120 and that is 2500 rpm. Surely I can get better fuel econmy than that?

What do others get with their XR6's
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Posted: Mon Sep 05, 2005 11:41 pm 
Getting Side Ways
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Age: 31

Posts: 597

Joined: 19th Jun 2005

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Ride: 98 XH XR6

Location: Diamond creek
VIC, Australia

i got 310 out of a 65ltr tank and that was taking it easy.

 

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ONE FOR RUM AND RUM FOR ALL

4.0ltr 1998 XH XR6 - 2 JVC 4way 6X9's - 2 JVC 4way 4" in doors - JVC head unit - AU XR8 intake snorkel


Paceys, hi flow cat and many more still to come

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Posted: Tue Sep 06, 2005 3:02 am 
Fordmods Junkie
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Joined: 17th May 2005

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Ride: EL Fairmont, VFR400 racer

Power: 144 rwkw

Location: Melbourne
VIC, Australia

uhhh im getting about 350km our of 68 litres, and thats half city and highway driving.

 

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EL XR6 motor, EL ECU + J3 chip, WADE 1673 Camshaft, 3" S/S intake, Pacy 4480, 2.5" Hi flow cat, 2.5" Lukey exhaust.
Max Power = 144.6 rwkw (03/05/2008)

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Posted: Tue Sep 06, 2005 3:14 am 
Getting Side Ways
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Last edited by blackjack_original on Fri Jun 06, 2014 4:23 pm, edited 1 time in total.

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Posted: Tue Sep 06, 2005 10:08 am 
Tyre Shredder
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Age: 37

Posts: 327

Joined: 6th Nov 2004

Ride: EL XR6

Location: Sydney
NSW, Australia

Thanks for the responses guys.

I have read that others get 700-800 kms highway work, I would have liked to at least get 550 because there was some city driving involved. I might have to change to premium and see if the kms improve

Does anybody have an idea about the idle of the car???
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Posted: Tue Sep 06, 2005 12:44 pm 
Parts Gopher
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Joined: 5th Mar 2005

Ride: Falcon

Location: Sydney
NSW, Australia

Umm, I might be talking nonsense. But check your MAP sensor. Some numb nuts unplugged mine, result was bad idle and shocking fuel consumption.

Now I average 450-500km per tank. 100% city.
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Posted: Tue Sep 06, 2005 1:12 pm 
Tyre Shredder
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Age: 37

Posts: 327

Joined: 6th Nov 2004

Ride: EL XR6

Location: Sydney
NSW, Australia

Do the I6's have MAP sensors??? and if so were is it located
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Posted: Tue Sep 06, 2005 3:49 pm 
Fordmods Junkie
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Posts: 5051

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Ride: Kia Rio - 1.4L Auto

Power: 238 rwkw

Location: Westside
VIC, Australia

I get between 400 to 500km city / driving to work, with closer to the 500km mark if I throw in some freeway driving.

Straight freeway 100km/h, my best is 820km. Average 650 to 750km depending on speed and if I'm facing some small hills to climb.

Just remember as well that the I6 ECU's have a lean cruise mode. It only works between 90 and 120km/h, straightish roads and constant throttle loads. So if you're pushing 120km/h, you are probably outside the lean cruise mode.

If I do a constant 100 to 110km/h, my trip computer will show 8 to 9l/100km. As soon as I cruise above 120km/h, trip computer will show 11 to 12l/100km.

And your map sensor is a little black box, screwed to the firewall, directly behind the intake manifold. It has a vaccum hose and electrical plug. Make sure the plug is there, and in firmly. Same with the vaccum hose. Firmly on both ends. Maybe take the hose off and check it is not broken, as that can happen. Considering you've done your head a couple of times and general trouble on that side of the engine, something could have been bumped or damaged.
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Posted: Tue Sep 06, 2005 6:45 pm 
Tyre Shredder
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Age: 37

Posts: 327

Joined: 6th Nov 2004

Ride: EL XR6

Location: Sydney
NSW, Australia

Quote:
And your map sensor is a little black box, screwed to the firewall, directly behind the intake manifold. It has a vaccum hose and electrical plug. Make sure the plug is there, and in firmly. Same with the vaccum hose. Firmly on both ends. Maybe take the hose off and check it is not broken, as that can happen. Considering you've done your head a couple of times and general trouble on that side of the engine, something could have been bumped or damaged.


Thanks for the response, that's something I need to check
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