What would cause a sudden increase in fuel consumption

**coupegt** · 13 August 2006, 16:30

Whew, problem solved. My baby is back again.

Removed the electrical connector on the MAF, and replaced, then I resat the ECU (removed batt. + for 5 min.) and then everything was back to normal.

Cant descripe how happy I am, was really concerned for a moment.

I suspect that the MAF electrical plug might not have been plugged corretly at first, and then the ECU went into limp home mode, causing the poor running.

***Greg_S*** · 14 August 2006, 10:45

Giood news you have fixed it. was going to suggest maybe lamda too, changed mine back at weekend and fuel consumption has improved.,

**coupegt** · 15 August 2006, 08:19

So the error came back. Spend like 8 hours of fault finding, and finally i found something.

At a steady 1500 RPM at standstill, the engine would run 1500, then drop to 1000 and then up again, in a circle of a couple of seconds. Idle speed was around 700, but jumping about 50 up and down.

Seems like the small damper thingy that the throttle body depresses when the accelrator pedal is released was not adjusted correctly.

I was moving it back and forward, and suddenly, like the flick off a switch it started to run smoothly.

I could even provoke the error to come back, if I adjusted the other way again.

I find this hard to understand, as the small damper does not have any vacuum hoses or electrical connectors to send signals anywhere, and I thought the only function was the throttle body was not closed to quickly.

Anyway, car run great as ever for a long strecth last night, so I hope that this was my fault, but do still not understand that this could have such a great impact on the performace. Does however explain, that the car ran ok at near full throttle, as the throttle body then is lifted completely off the damper thingy.

Any comments on this?

**Eriksson** · 15 August 2006, 12:54

My car has also been dooing this.

So the small damper on the inlet mainfold, and throttle body is causing this problem ? and hevy running.
My car felt like the hand brake was in at a stable speed. ?!?

Tell me if you find out something more.

Cheers

**WabTheKing** · 15 August 2006, 13:44

just had similar prob with my rx-7 turned out to be a blocked cat

**GT500** · 15 August 2006, 16:58

yes, full o feckin RICE!!!!!!!

**coupegt** · 15 August 2006, 18:11

Originally posted by Eriksson

My car has also been dooing this.

So the small damper on the inlet mainfold, and throttle body is causing this problem ? and hevy running.
My car felt like the hand brake was in at a stable speed. ?!?

Tell me if you find out something more.

Cheers

Yeah, at from 0 to 100 app. it felt hesitating and a little stumbeling, and did not really want to pull. Kinda like the handbrake was a notch or two up. At more throttle and higher speeds everything was normal, also consuption.

Error came back today, because i did not get the small nut that locks the damper tightened properbly, so the damper had moved a little again. Adjusted once more, thightened the nut, and error is gone, so this damper defenitly has something to do with the running at slower speed and only partially open throttle body.

**Eriksson** · 16 August 2006, 08:21

I think i know what the prolem is.

The TPS Throttle possition sensor that is lockated at the throttle body against the firewall.

My did not click when stepping of the throttle. so he adjusted it. (2 bolts)
Now everything seems to work fine, the car rews more smooth now.

Cheers

**s2dude** · 16 August 2006, 09:01

Originally posted by GT500

yes, full o feckin RICE!!!!!!!

What would cause a sudden increase in fuel consumption

What would cause a sudden increase in fuel consumption

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment

Comment