Renault Trafic 1.9dci no throttle response on cold start

[lmsvvavr]

This issue has been debated all over the web, but with no conclusive outcomes...
So, this trafic on cold start has no response from the throttle pedal... a few seconds later,(random from 5sec to 30sec) starts to respond, and runs fine for the rest of the day... unless if parked for a long period of time...

I have tried to increase the idle RPM by 10 RPMs, made no difference...

Today I have plugged in clip am monitored the cold start... (had no throttle response for about 6-7sec)



Can anyone comment this values?
I am bit suspicious about the injectors flow correction....????

[Meat-Head]

yeah theirs VARIOUS rumor going around egr valve MAF.

we had one, sadly it never became our job 100%

can't remember now, but when it faulted the gas pedal was working as it should with a voltmeter

see if you can block off the egr valve with a piece of coke can.

for tresting when not faulty unplug airflow meter see if it rev and what rpm then repeat experiment when cold.

[lmsvvavr]

yeah theirs VARIOUS rumor going around egr valve MAF.

we had one, sadly it never became our job 100%

can't remember now, but when it faulted the gas pedal was working as it should with a voltmeter

see if you can block off the egr valve with a piece of coke can.

for tresting when not faulty unplug airflow meter see if it rev and what rpm then repeat experiment when cold.

Thanks for the quick reply M-H, before the van came to me, the maf has been changed, but I will try disconnect it tommorow morning and have go...

Oh, the pedal is a brand new one...

I also got to the plug by the relay/fuse box, it was a bit corroded, but nothing major, gave it a cleaning and put it all back together...

[Meat-Head]

the maf has been changed, but I will try disconnect it tommorow morning and have go...

tomorrow is Sunday that' spend all day on DK day not working.

if it has been changed then spend your time blanking off the egr valve.

plug your diagnostic on - look at throttle posistion and pedal position.

if you start then stop before it revs what happens?

full throttle then start?

[lmsvvavr]

tomorrow is Sunday that' spend all day on DK day not working.

if it has been changed then spend your time blanking off the egr valve.

plug your diagnostic on - look at throttle posistion and pedal position.

if you start then stop before it revs what happens?

full throttle then start?

Right, full throttle then start makes no difference...
The throttle position and pedal position both match when the van is reving ok...
Need to check tomorrow what it does when is not reving...

Cause I can only replicate the problem oce, if licky twice a day, is taking ages to try to find anything...

[Meat-Head]

before you do run run the engine read the coolant and air temp

DOUBT it very much incase it's a hidden feature - eg rumor states BMW is limited rpm till warm

wounder if oil pressure related no rev rev until oil pressure up

has it got one wire on oil pressure sensor.

look at that stupid oil gauge in dash see what oil it things it has.

[lmsvvavr]

before you do run run the engine read the coolant and air temp

DOUBT it very much incase it's a hidden feature - eg rumor states BMW is limited rpm till warm

wounder if oil pressure related no rev rev until oil pressure up

has it got one wire on oil pressure sensor.

look at that stupid oil gauge in dash see what oil it things it has.

will take a print screen and will post it to analize...

[genius76]

Train fast start
Put key and immediately start engine don't wait any second

[genius76]

If the pedal responds let me know

[lmsvvavr]

If the pedal responds let me know

ok, i will...

[Meat-Head]

Train fast start
Put key and immediately start engine don't wait any second

Huh you seem to be quite a helpfull newish member explain more please

[genius76]

Injectors ecu correction
Festart not allow for the ECU to pick up the last injets settings
I had a client with a zafira with the same problem
I sent it to a guy who made the ecu remap as the customer chooses that too expensive to replace the jets
This is not necessarily the problem is but just in case
After all try FastStart does not cost anything

[lmsvvavr]

Injectors ecu correction
Festart not allow for the ECU to pick up the last injets settings
I had a client with a zafira with the same problem
I sent it to a guy who made the ecu remap as the customer chooses that too expensive to replace the jets
This is not necessarily the problem is but just in case
After all try FastStart does not cost anything

Hi there...
Tried your suggestion but the same result... although the engine toke a few turns to start... there is -1!
Still no throttle...
I will try read the live data in the morning...

[lmsvvavr]

Right, went today and done some live redings, as suggested above...

Prior to start the engine:


Engine running and no pedal response:


Engine running with pedal response:


The pedal response came in about 5 sec after the engine started, cleanning the plug by the fuse/relay box seemed to improve it, used to be mutch worse...

From the above the only parameter that changed with the pedal response is the air flow, so can well be the maf...
or a slow response from the clip tool, as I have take the photo as soon as the engine started...
Will try again tonight to see what happens...

Anyway, this morning I have noticed that just before the pedal started to respond I could hear a change in some noise in the egine bay, not sure if is related...

Any suggestions?

[garryreed]

two things spring to mind ... egr valve and the contacts on the main plug in the engine fuse ... the header tank is above it and the suffer corrosion.