Wont idle. No fault codes!

[SteveP]

Afternoon all. Am new on here (although been a lurker for a while!). I have searched everywhere for an answer to this and am stumped, as are the mechanics who have been out..To say i am beat is not the word.

My other half has a 206cc 2003 1.6 model.

She had it recovered home a couple of weeks ago after it started to overheat. She was sensible and it didnt get too hot. After looking into iut i found that the wiring to one of the front relays by the radiator had corroded and broken. Thsi was all replaced including a new relay. Since this overheating the bloomin car wont idle.

She starts and runs fine but as soon as i take my foot off the accelerator it dies. I did reset the BSI and disconnected as per the instructions on here. She has had a new throttle body, temp sender switch and MAP sensor.

Now the daft part is, if i disconnect the MAP sensor, or any of the vacuum pipes she will idle albeit a bit lumpy byut can be driven fine. I have had her on a live diagnostic machine which picked up the fan and relay faults which were cleared and then they didn't come again.

The mechanic thinks it may be some electric fault somewhere or possibly a software update issue.

Can anyone on here shed any light ion this problem please?

Steve

[Enright]

Can you put your location in your profile please? You may find there's someone nearby who can help.

[Capncol]

Could the wiring to the lambda sensors have got damaged? (although I would have expected warning light)
Did you calibrate the new throttle body properly?

[SteveP]

Neil, sorry, yes will do.
Cap no. I thought that would be covered with the bsi reset.

[Capncol]

Direct from the book of words..........



Programming the motorised throttle housing
For this system to operate correctly, it must be programmed.
The programming procedure consists of programming the closed and fully
open positions of the throttle.
The throttle position programming procedure should be performed after:
• replacing the ECU,
• replacing the motorised throttle housing,
• repairing the motorised throttle housing after a fault is detected,
• downloading the ECU,
• telecoding the ECU.
Motorised throttle housing programming procedure
• reconnect the wiring harnesses,
• switch on the ignition,
• leave the ignition on for at least 10 seconds (do not switch off the ignition
during these 10 seconds and do not press the accelerator pedal),
• switch off the ignition and leave it off for 15 seconds (the ECU records the
motorised throttle programming parameters in the EEPROM - this is the
POWER LATCH phase),
Warning: Do not switch the ignition on during these 15 seconds.
Important: If the values are not programmed:
• the system will not control the engine torque correctly as a
function of throttle opening,
The ECU will effectively not be able to precisely recognise:
• the closed and fully open positions of the throttle.
This operating fault will last until the ignition is switched off and until the
POWER LATCH sequence has finished (minimum duration = 15 seconds).
The throttle position is also programmed automatically during the engine's life
to counteract wear in the throttle's minimum end stop.
In effect, the ECU systematically compares the memorised "Limphome"
position (non controlled throttle position) with the position when the ignition is
switched on.
If this value is not equal to 300 mV, the ECU will perform the programming
procedure.
Therefore from time to time, after the end of the POWER LATCH sequence, a
clicking noise from the throttle can be heard as it comes into contact with its
end stops.
This is not an operating fault

[SteveP]

Thanks Col. I take it I should clear the bsi again first to clear the memory before doing this or is it ok to do it straight from now?

[Capncol]

No need to reset BSI

[SteveP]

Nope no difference at all. It's as if the revs aren't high enough with the map sensor and vacuum leads plugged in. Taking one of those out raises the revs enough for it to run but then it just idles rough.

[Capncol]

OK. Back to basics a bit.
What scanner was used to try and obtain fault codes?
Was live data looked at? In particular, Throttle angle, fuel pressure, MAP, and Ign advance?
Why was the temp sender, MAP and TB replaced? Just guessing or faulty readings? Were they new items or S/H?

[SteveP]

Two different ones. One was a code reader that picked up nothing, the other I don't know what type it was but was told it was a live reader. Watched the guy and he had to put vehicle details in then some form of little pcb from a selection. Once connected he was able to run diagnostics all of which came back ok.. Only issue he found was trying to force the fan to work and it wouldn't at all. Oh and the bloomin fan isn't working either after checking, the relays have power and the fan works if bridged from a 12v source. Plan is to do a manual override to a switch inside that can be manually operated. Could these two things be connected?
Everything else was changed just to be safe. The temp switch because of the overheating (belt and braces) along with the thermostat.
Map sensor was new the throttle body s/h
.

[gazza82]

That sounds like a snap-on diagnostic ... there's a Peugeot specialist in Old Windsor that uses one of those .. he diagnosed my airbag fault light.

[SteveP]

He's local but not Old Windsor. May I ask who the Peugeot specialist is as that's really close.

[SteveP]

Anyone any other ideas? Please.

[gazza82]

A T C Motor Services

Unit 9 65a, Straight Rd, Old Windsor, Windsor, Berkshire, SL4 2SA

Tel: 01753 842771



I've used them in the past but not recently. They are in the yard behind that estate agent in short row of shops before the Bells of Ouzeley.

[SteveP]

Thanks Gazza