idle problem

[apoc_reg]

When im at traffic lights (or any other stationary position) im at about 1000rpm, but just recently they keep momentarily dipping below that to the point where the car almost stalls, it then rises back to 1000rpm and then will dip again a few seconds later.

This is possibly since I fitted my nurspec but im not 100% on that.

I am having a service and the car set up on a dyno in a few weeks (as the fuellings probably not right with nur, no cats and induction kit) hopefully this will sort this new problem out.

But if anyone knows what exactly could cause this I would sleep easier!

Thanks a lot

Rich

[Paul Laing]

Have you tried resetting the ECU?

Do you have an induction kit on your car? When i got my car back from Toyota mine was doing this and i found out they hadn't tightened the jubilee clip that connects the filter to the MAF sensor, so that was the cause of mine. Could look around that area.......

Paul

[apoc_reg]

yes i have a HKS super power flow induction kit.
i shall check the clip

How do i reset the ecu?

Cheers

[Soonto"HAS"soop]

Originally posted by apoc_reg
How do i reset the ecu?


Disconnect the Battery for a couple of minutes.

Just don't forget any alarm shutdown procedures and stereo codes etc etc.

Ben..

[Paul Laing]

NO!!!!! Don't disconnect the battery mate, just take out EFI 1 fuse from the fuse box on the right hand side of your car.

Take it out and put it back in after 1 minute.

Paul :)

[apoc_reg]

Thanks guys, i removed the fuse for a minute and shall see how she goes!

[Paul Laing]

How is she?

[Andrew]

You could also try a Relearn, this sorted out my idle problems.

This is taken from the Supra Manual.

COMPUTER RELEARN PROCEDURES
1996 Toyota Supra
GENERAL INFORMATION
Computer Relearn Procedures
All Models
* PLEASE READ THIS FIRST *
The following general procedures are to be used if
driveability problems are encountered after power loss or battery has
been disconnected. These procedures may provide an aid in eliminating
these problems.
To reduce the possibility of complaints, after any service
which requires battery power to be disconnected, vehicle should be
road tested.
COMPUTER RELEARN PROCEDURES
Vehicles equipped with engine or transmission computers may
require a relearn procedure after vehicle battery is disconnected.
Many vehicle computers memorize and store vehicle operation patterns
for optimum driveability and performance. When vehicle battery is
disconnected, this memory is lost. The computer will use default data
until new data from each key start is stored. As computer memorizes
vehicle operation for each new key start, driveability is restored.
Vehicle computers may memorize vehicles operation patterns for 40 of
more key starts.
Customers often complain of driveability problems during
relearn stage because vehicle acts differently then before being
serviced. Depending on type and make of vehicle and how it is
equipped, the following complaints (driveability problems) may exist:
* Harsh Or Poor Shift Quality
* Rough Or Unstable Idle
* Hesitation Or Stumble
* Rich Or Lean Running
* Poor Fuel Mileage
These symptoms and complaints should disappear after a number
of drive cycles have been memorized. To reduce the possibility of
complaints, after any service which requires battery power to be
disconnected, vehicle should be road tested. If a specific relearn
procedure is not available, the following procedure may be used:
Automatic Transmission
* Set parking brake, start engine in "P" or "N" position.
Warm-up vehicle to normal operating temperature or until
cooling fan cycles.
* Allow vehicle to idle for one minute in "N" position. Select
"D" and allow engine to idle for one minute.
* Accelerate at normal throttle position (20-50%) until vehicle
shifts into top gear.
* Cruise at light to medium throttle.
* Decelerate to a stop, allowing vehicle to downshift, and use
brakes normally.
* Process may be repeated as necessary.


Manual Transmission
* Place transmission in Neutral position.
* Ensure emergency brake has been set and all accessories
are turned off.
* Start engine and bring to normal operating temperature.
* Allow vehicle to idle in Neutral for one minute.
* Initial relearn is complete: process will be completed during
normal driving.
Some manufacturers identify a specific relearn procedure
which will help establish suitable driveability during relearn stage.
These procedures are especially important if vehicle is equipped with
and electronically controlled automatic transmission or transaxle.
Always complete procedure before returning vehicle to customer.

[apoc_reg]

resetting the ECu has pretty much sorted it out though theres still the very occasional dip.

I shall try the re learn now!