Excessive fuel consumption


S

stezie

Member
Joined
Oct 13, 2010
Messages
163
Hi

I have an ek4 with dc2 inlet manifold, j racing slug type induction kit, ek9 cams, ek9 ecu, vafc, standard exhaust manifold.

I filled the tank and within 90 miles its at half a tank.. No mad driving at that. Only put the car on the road this week as I only used it for a couple of track days first.

My idle speed is around 1050rpm so I cleaned the fast idle control valve as Per instructions here, as well as bridging the diagnostic plug, UN plugging the ficv and setting the base idle speed to 550rpm. When I reset the ecu the idle speed returns to 1050rpm.. I'm pulling my hair out as my car test is next Tuesday and would think my emissions are sky high..

I'm guessing the ficv is kaput... But had anyone got Any ideas?
 
Last edited:
If the IACV is buggered you'll have running problems usually not bad fuel consumption , you need to check for a strong spark and o2 sensor/tps voltages
 
Darragh_K said:
If the IACV is buggered you'll have running problems usually not bad fuel consumption , you need to check for a strong spark and o2 sensor/tps voltages
Click to expand...

ah ok.. any write ups on this site that would give me a guide on how to check those?
 
DC2 inlet manifold? You mean a Type R one?

Ah start with the basics first, all of these will help:

Air filter
Fuel filter
Correct and new spark plugs
Correct timing
02 sensor
 
tysonzane said:
DC2 inlet manifold? You mean a Type R one?

Ah start with the basics first, all of these will help:

Air filter
Fuel filter
Correct and new spark plugs
Correct timing
02 sensor
Click to expand...

That's correct, a dc2 integra type R inlet manifold..

The induction kit is less than 1.5k miles old and fitted new fuel filter, spark plugs, new oil and filter on Saturday.

Would the o2 sensor put on the ecu light if it was finished?

And don't have a timing light , so might have to get someone to check the timing so.
 
My bet would be the O2 sensor, as I had something similar happen with my Subaru last year, theres a pretty good explaination of how to test the sensor here:
Just Lambda, Suppliers of Bosch and NTK lambda sensors including zirconia and titania sensors by post
I did see a similar issue recently with an EK model Civic who's MAP sensor had died - disconnecting the sensor put the engine into limp home mode but the idle and emissions cleaned up considerably (although not perfectly), replacing the MAP sensor had the car running right as rain again.
 
I was wandering through this site earlier and came across a post where someone mentioned that the thermostat wasnt keeping the coolant warm enough to allow the fast idle control valve to fully close... so after work I took the car for a wee drive and backed it into the garage, lifted the bonnet and the bottom coolant pipe was luke warm..

Whats the chances its just a thermostat causing this?? Anyone else seen this?
 
ok got a blue print thermostat this morning from an auto factors and it doesnt work.... I sat the car in the garage until the thermo opened and the bottom pipe warmed up...

I drove the car to work and the checked when I got there and bottom pipe was cold again... WTF... any idea??

I start a new thread on this i reckon..
 
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