Cultus efi rpm drops to zero & shuts down on AC after a bit long high speed drive, rest normal without AC and if turned ON again smoothly works after a while and stablizes its rpm

fighters.f16 (Riz) 2020-05-31 20:04:01 +0500 #1

My car cultus efi 2007 vxr works very fine if running without AC. Even with AC it runs very smoothly. But once if run for long run at 3000+ Rpm (or high speed) continuously and braked as soon as i press clutch the rpm rushes to 0 and car shuts down. Car is not even hot, it’s centre. The heat sensor is working fine in its operation from cold to hot. So the car is not getting hot. And once the car shuts down, it is started again and starts normal. And rpm stabilises in a while. This only happens if car is running for more than 15 minutes continuously at high rpms. My is on petrol. It had cng option but i removed the cylinders long ago. So i run on petrol only. Please help this issue.

fighters.f16 (Riz) 2020-06-02 22:49:54 +0500 #2

Aik chez aur, jo menay observe kia, wou ye k agr main gari chala ra hu aur bara gear may ho aur menay clutch dbana ho tou agr mein foran clutch dba du jab rpm 1000 say zyada hon tab gari band hojati ha, laikin agr clutch na dbao aur auto pe speed kam honay pe rpm kam hotay jatay hain speed k sath aur jesay hi mein usko dekhta hu k 1000 say nechay gayay tab clutch agr dbao tou phir gari nai band hoti aur rpm uper jatay hain clutch dbanay pr aur gaari band nai hoti... laikin iss maslay ka hal nai milra... kyu k kabhi achanak clutch dbana prta ha tou 1000 say uper rpm wala wqt b ajata ha aur tab normally gaari band hoti hai...

RehanBhatti (RehanBhatti) 2020-06-02 22:59:05 +0500 #3

Did you try to clean idle air control valve? If not
Then clean it with carb cleaner and give us feed back.

fighters.f16 (Riz) 2020-06-02 23:15:24 +0500 #4

Can you point out from my engine picture that which one is that Idle control valve.
As i got alot of things serviced n replaced, like plugs, air filter, plug wires, service of throtle body etc. May be it have been cleaned or changed but if you can point it out.

RehanBhatti (RehanBhatti) 2020-06-02 23:42:20 +0500 #5

Its under the throttle body. Any knowledgeable mechanic can clean it properly.

fighters.f16 (Riz) 2020-06-23 00:33:35 +0500 #6

Did it as you mentioned. The problem is still same!

RehanBhatti (RehanBhatti) 2020-06-23 09:05:12 +0500 #7

Follow below IAC valve duty check procedure by a digital multimeter,

fighters.f16 (Riz) 2020-06-23 11:22:47 +0500 #8

I have got a multimeter but I don’t know which wires to check from this picture. Can you explain further?

RehanBhatti (RehanBhatti) 2020-06-23 11:40:23 +0500 #9

There is a diagnosis switch close to ignition coil. Check voltage there according to the procedure in picture.

brownrose78 (brownrose78) 2020-06-23 15:14:46 +0500 #10

@fighters.f16
Have you recently or in past have ever serviced/washed/cleaned your Throttle Body?

If yes, then search on pakwheels archives & older posts how to resolve this issue

RehanBhatti (RehanBhatti) 2020-06-23 18:24:49 +0500 #11

His problem is IAC valve related. His sensor or valve is given up.

fighters.f16 (Riz) 2020-06-23 18:26:04 +0500 #12

Yes I have got it serviced last year and probably the problem started after few weeks which I came to know with time. I thought it would be a minor one. Recently also got serviced, thought it would clear the problem, but didn’t!

fighters.f16 (Riz) 2020-06-23 18:26:59 +0500 #13

You got any picture of that?

fighters.f16 (Riz) 2020-06-23 18:28:02 +0500 #14

I can be precise now as I have now noticed it very minutely. This happens with AC on only, to what I have experienced.

RehanBhatti (RehanBhatti) 2020-06-23 18:29:38 +0500 #15

Rotate the IAC valve sensor clockwise a little bit then observe your rpm with AC.

fighters.f16 (Riz) 2020-06-23 18:39:03 +0500 #16

Which one is that IAC sensor?

RehanBhatti (RehanBhatti) 2020-06-23 18:44:03 +0500 #17

It is under this TPS.