High idle and due for MOT!

[HJ2]

Dear all,


My Belgian friend Ivo has some problems with high idle on his Elan. I thought i would make a new topic for it so he can focus on the solution (hopefully)
his MOT is due early February, and it will not pass for sure in the current state, so all help is appreciated! I'll start with helping him out by translating for him and post on LEC

Problem:
With a warm engine suddenly idle started to go up to 2.500 RPM, which is now the default idle rpm with hot engine.
From cold, idle starts at around 1500 pm.

Some history:
Cheapscan showed error 22 (low voltage TPS)
Tried to re-adjust the TPS, but 1500 rpm was as low as it would get. Any lower and the engine stalled.
After that tried another TPS + throttle body, but with the same results (so... NO results...)
Then replaced the CTS, but without any luck, no result

HJ2's earmarked candidates: 1. IAC, 2. Vacuum leak 3. Air Temperature Sensor


Any other pointers would be appreciated!

[HJ2]

Sorry for my Dutch:

Hoi Ivo,



Wat je moet onderzoeken:
Als je voor de motor staat, dan zie je aan de achterkant van het gasklephuis 2 of 3 pijpjes (Vacuum aansluitingen) zitten.
1 ervan gaat met een knietje naar beneden. Dit knietje gaat vaak kapot. Controleer visueel / voelen of deze vacuumslangen nog heel zijn.

Je kunt ook proberen met een draaiende warme motor een willekeurige vacuumslang los te trekken zodat je ZEKER weet dat er een vacuumlek ontstaat.
Als de motor tijdens het lostrekken van de slang niet van toerental verandert, was er dus al een vacuüm lek, en zul je alle vaccumslangen moeten nalopen. Tip: in de linker wielkuip (bestuurderszijde) zit onder het plastic aan het schutbor het vacuumreservoir geschroefd waar de meeste vacuumslangen aan zitten gekoppeld. Uiteraard kun je ook luisteren of je ergens gesis hoort!

De IAC valve: Deze zit aan de achterkant van het blok, onder het gasklephuis en zit vast met…. Een vacuum slangetje en 2 kruiskop schroeven.

Maar: Achter in het gasklephuis zit nog een sensor geschroefd (goed bereikbaar) en deze meet de lucht temperatuur van de lucht die wordt geinjecteerd. Deze zou ik ook eens doormeten kerel!
Veel succes!

Hier vind je de componenten:
http://wikilec.9600.org/index.php/Engin ... components
IAC Valve: Nr. 25
MAT sensor: nr. 19
Naast 19 zitten ook de vacuum aansluitingen.

[RayD]

It's most probably a vacuum leak ... try pulling one of the tubes off to see if the speed increases ... if it doesn't it will confirm it's already leaking.

Ray

[ovi]

Thanks HJ for posting my problem and also Ray for the tip!

[HJ2]

Sorry to hear about the crash of the family car Ivo!
That's a big challenge fixing that AND be in time with the Elan repair for the MOT.

If I were you i would spend one hour on the Elan (vacuum), chances are that it will be fixed then and that is one problem less to bother you.

[GeoffSmith]

It's most probably a vacuum leak ... try pulling one of the tubes off to see if the speed increases ... if it doesn't it will confirm it's already leaking.

Ray

[ovi]

Sorry to hear about the crash of the family car Ivo!
That's a big challenge fixing that AND be in time with the Elan repair for the MOT.

If I were you i would spend one hour on the Elan (vacuum), chances are that it will be fixed then and that is one problem less to bother you.

Yep, our daughter has once again crashed a car!
Going to try to dismantle all the pleated parts this weekend.

Nevertheless will first try to resolve the problem with the Elan.

[ovi]

This weekend finally time to take a further look!

[Ade]

Hi
I had a similar problem, after much searching it was found to be the earth wire being loose. This is the earth on the left of the engine as you look at it down by the cam belt cover to the left of it towards the alternator..

Ade.

[RayD]

Hi
I had a similar problem, after much searching it was found to be the earth wire being loose. This is the earth on the left of the engine as you look at it down by the cam belt cover to the left of it towards the alternator..

Ade.

This detail was added to the Tickover page on the Wiki at the time Ade posted it ... it would probably benefit from being expanded on and maybe a picture adding.

Ray

[HJ2]

... So Ivo, What's the current status then?

[ovi]

Hi
I had a similar problem, after much searching it was found to be the earth wire being loose. This is the earth on the left of the engine as you look at it down by the cam belt cover to the left of it towards the alternator..

Ade.

Could it be that these are two wires? Than I already checked and no problem found.

[ovi]

... So Ivo, What's the current status then?

This weekend finally time to take a further look!

[ovi]

Everything checked and found nothing.
However, there's no error code more so the TPS is good.
No leaks were found, and I mounted the throttle valve with silicone to be sure not to draw false air.

My patience is wearing thin.

[Enright]

It's not blown the idle-speed adjuster screw out has it, like in this thread?
Try either using a 2ft piece of hose as a stethoscope to trace the hissing noise, or blocking the intake pipe.

[ovi]

It's most probably a vacuum leak ... try pulling one of the tubes off to see if the speed increases ... if it doesn't it will confirm it's already leaking.

Ray

Done but nothing!

[ovi]

I try myself in my best English so sorry for the mistakes!


Enright!
I bought a full throttle body with TPS mounted from my friend Peter who was on an Elan he had just bought for parts and was therefore certainly fine functioning.

Have meanwhile replaced everything whatever I can and I don't hear a small leak anywhere so I do not know.
Some history:
Cheap Scan Showed error 22 (low voltage TPS)
Tried to re-adjust the TPS, but 1500 rpm was as low as it would get. Any lower and the engine stalled.
After That tried another TPS + throttle body, but with the same results (SO ... NO results ...)
Then Replaced the CTS, but without any luck, no result
Replaced MAT: no result

Yesterday I received the new IAC valve from SJ and mounted but the result remains the same!
So I keep searching.

[ovi]

http://wikilec.9600.org/index.php/Image ... cation.gif
Could it be that there is something wrong with part 9? (Exhaust Gas Recirculation vacuum solenoid valve)
If I blow smoke from my cigar in the small bowel from the EGR smoke comes out from above through the holes off part 9? Should that be closed?
This still contains a membrane so I guess that normally can not pass through?

HJ, declare my teks if necessary because I do not know if I wrote it understandable!

[HJ2]

Ivo,

I think there is no need to improve your translation. At least i can read it fine and know perfectly what you mean!
If am correct, it is still a fact that when you pull a vacuum hose, the rpm does not change at all. (as it was high already).

So it still looks like the vacuum system needs to be investigated a bit further!

Perhaps you can clamp (dichtknijpen met een klemmetje) the vacuum hose to the EGR solenoid and see if that changes something.
In fact you could do that with all strategic positioned vacuum hoses!

After the EGR I would start with heater control (block it all together from the vacuum reservoir under the front left wing). as there are a lot of hoses there that could go awry.

Good luck man!

[epipete]

Though, personally, I don't think 'Blowing smoke from your cigar into your small bowel' is either recommended (or indeed what you meant)

Nevertheless, your English is a darn sight better than my Dutch, so no worries