idling problems b18ft

razzy69 · Jun 14th, 2010, 08:23

Hi, ive just dropped in a b18ft into my renault 5 gt turbo but the engine idles at 2000rpm. im presuming the choke is still on but what sensor tells the ecu the engines warm to take the choke off?? just had new dizzy, rotor, plugs, ht leads, lamba sensor
cheers

B20F · Jun 14th, 2010, 10:26

The ecu gets is warm/cold signal from the coldstart sensor (coolanttemp.sensor) which is located beneath the right hand plug. It has 2 terminals on a turbo. But I don't think this sensor is causing the high idle. It only raises the cold idle with appr.200revs. Most of the times such a high idle is caused by a vacuum leak somewhere in the system. So check and double check all the vacuum hoses. Another thing you should check is the idle valve in front of the plugs, it has 2 hose connected on top of it with a 2 pin connector. Remove and flush the innards with white spirit or some other solvent to remove dirt built up.

razzy69 · Jun 14th, 2010, 10:42

the other thing i forgot to mention is that its running very rich, and although boosting to 8psi, when u come off the throttle there is a big hesitation?
i must admit that there is no knock sensor attached could this have an effect?

B20F · Jun 14th, 2010, 15:10

If it's running very rich check for an air leak after the MAF. Also a non original (Bosch) lambda could result in running rich.
If the knock sensor is not connected the ecu will retard ignition with something like 10degrees, which can result in hesitation and loss of power.

grass hopper · Jun 14th, 2010, 15:56

previous comments were for the wrong engine variant,as mentioned could be a fault with the idle air control valve,does it buzz/open when the ignitions switched on ?

razzy69 · Jun 14th, 2010, 16:45

where does the knock sensor plug into? what are the values of the wires? ie 5v? as ive done this conversion myself there are two types of wires left with different voltage outputs

B20F · Jun 15th, 2010, 10:24

The knocksensor plugs in the ignition/turbocharge controle module (Bosch EZ210K) at connections 12&13. Don't know the colours of the wiring, you can look that up at the back of the module. To fit the knock sensor be sure you torque it exactly with 20nm. Any less or more torque and it can't function properly!

Nifton · Jun 16th, 2010, 07:23

I have a spare if you're interested...

razzy69 · Jun 17th, 2010, 11:29

Cheers fellas sorted the knock sensor but still the same scenario, ive checked icv thats fine. So the only thing that i need to check is the engine temp sensor for the choke. Am i right in thinking that it is pin 2 (+) and pin 25(-) ?? Thanks for the help

razzy69 · Jun 21st, 2010, 12:58

Still having the same problem, everything else is working perfectly. tested the icv and cleaned it out, knock sensor is functioning correctly, lamba sensor is working. all hoses have been vacuum checked. the only thing that is not connected is the head temp sensor as i dont know where it wires into ( conversion on R5) as i said it runs sweet cold as it hits 70-80c it starts to lumpy idle and black smoke comes out. if i turn her off and back on while its still hot its even worse???

Jun 14th, 2010, 08:23	#1
razzy69 New Member Last Online: Jun 21st, 2010 15:26 Join Date: May 2010 Location: brockley	idling problems b18ft Hi, ive just dropped in a b18ft into my renault 5 gt turbo but the engine idles at 2000rpm. im presuming the choke is still on but what sensor tells the ecu the engines warm to take the choke off?? just had new dizzy, rotor, plugs, ht leads, lamba sensor cheers

Jun 14th, 2010, 10:26	#2
B20F Master Member Last Online: Jul 7th, 2016 21:43 Join Date: Mar 2007 Location: Zeist View Photos By: B20F	The ecu gets is warm/cold signal from the coldstart sensor (coolanttemp.sensor) which is located beneath the right hand plug. It has 2 terminals on a turbo. But I don't think this sensor is causing the high idle. It only raises the cold idle with appr.200revs. Most of the times such a high idle is caused by a vacuum leak somewhere in the system. So check and double check all the vacuum hoses. Another thing you should check is the idle valve in front of the plugs, it has 2 hose connected on top of it with a 2 pin connector. Remove and flush the innards with white spirit or some other solvent to remove dirt built up. __________________

Jun 14th, 2010, 15:10	#4
B20F Master Member Last Online: Jul 7th, 2016 21:43 Join Date: Mar 2007 Location: Zeist View Photos By: B20F	If it's running very rich check for an air leak after the MAF. Also a non original (Bosch) lambda could result in running rich. If the knock sensor is not connected the ecu will retard ignition with something like 10degrees, which can result in hesitation and loss of power. __________________

Jun 14th, 2010, 15:56	#5
grass hopper Premier Member Last Online: Mar 18th, 2011 13:38 Join Date: May 2009 Location: grassmere!	previous comments were for the wrong engine variant,as mentioned could be a fault with the idle air control valve,does it buzz/open when the ignitions switched on ? __________________ Last edited by grass hopper; Jun 14th, 2010 at 16:58. Reason: wrong engine

Jun 15th, 2010, 10:24	#7
B20F Master Member Last Online: Jul 7th, 2016 21:43 Join Date: Mar 2007 Location: Zeist View Photos By: B20F	The knocksensor plugs in the ignition/turbocharge controle module (Bosch EZ210K) at connections 12&13. Don't know the colours of the wiring, you can look that up at the back of the module. To fit the knock sensor be sure you torque it exactly with 20nm. Any less or more torque and it can't function properly! __________________ Last edited by B20F; Jun 15th, 2010 at 12:59.

Jun 14th, 2010, 10:42	#3
razzy69 New Member Last Online: Jun 21st, 2010 15:26 Join Date: May 2010 Location: brockley	the other thing i forgot to mention is that its running very rich, and although boosting to 8psi, when u come off the throttle there is a big hesitation? i must admit that there is no knock sensor attached could this have an effect?

Jun 14th, 2010, 16:45	#6
razzy69 New Member Last Online: Jun 21st, 2010 15:26 Join Date: May 2010 Location: brockley	where does the knock sensor plug into? what are the values of the wires? ie 5v? as ive done this conversion myself there are two types of wires left with different voltage outputs

Jun 16th, 2010, 07:23	#8
Nifton Junior Member Last Online: May 30th, 2020 11:52 Join Date: Dec 2009 Location: Sheffield	I have a spare if you're interested...

Jun 17th, 2010, 11:29	#9
razzy69 New Member Last Online: Jun 21st, 2010 15:26 Join Date: May 2010 Location: brockley	Cheers fellas sorted the knock sensor but still the same scenario, ive checked icv thats fine. So the only thing that i need to check is the engine temp sensor for the choke. Am i right in thinking that it is pin 2 (+) and pin 25(-) ?? Thanks for the help

Jun 21st, 2010, 12:58	#10
razzy69 New Member Last Online: Jun 21st, 2010 15:26 Join Date: May 2010 Location: brockley	Still having the same problem, everything else is working perfectly. tested the icv and cleaned it out, knock sensor is functioning correctly, lamba sensor is working. all hoses have been vacuum checked. the only thing that is not connected is the head temp sensor as i dont know where it wires into ( conversion on R5) as i said it runs sweet cold as it hits 70-80c it starts to lumpy idle and black smoke comes out. if i turn her off and back on while its still hot its even worse???

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