182 Limp Mode

[Kiffle]

Looking for some advice please - I hope someone can help me! My 182 keeps going into limp mode but my code reader will not show me what the problem is. It does it instantly when driven at high rpm (about when VVT would kick in), or it does it at any RPM after about 10mins of normal driving. Won't go above 2.5k but idles at normal revs.


The car is running a 172 Cup engine, no AC, EPAS and a JMRS intake. The HT leads, spark plugs and alternator were new as of October 2020. There is not much left of the Cat, this was seen at the last MOT - there is a P0420 code that can be cleared for a bit but always returns.


I've cleaned the throttle body out and checked the connection to it which seem to be fine. The connections to the inlet and coilpack are also in good condition.


Would appreciate any help towards this before I start pulling my hair out!


Cheers

 

[Louis]

Whats your coolant temperature? You say high rpm, what's that?

VVT kicks in at about 2.2k iirc.
Potentially coolant temp sensor as it never gets out of the 'cold map'. Does the EML flash?

 

[JamesBryan]

"vvt" is active from 1800rpm.

High rpm faults are usually spark related in my experience. Possibly coilpack.

What is it doing exactly?

 

[Kiffle]

Thanks for the responses guys!

I have had some other issues since I posted this (immobiliser related as the car wouldn't even start) but think I've got the limp mode narrowed down to a dodgy throttle pedal after scanning the fault codes.

The EML light never flashed, but is constantly on due to a P0420 code for the lambda.

With regards to the high rpm bit I meant was when you get that extra kick from about 5k. I didn't realise that VVT was active from so low down in the revs - the more you know!

I have a new coolant temp sensor and intake temp sensor on the way just in case it still happens.

Trying to get to the bottom of the immobiliser issue but should have that sorted by the end of the day.

 

[Suspect]

Thanks for the responses guys!

I have had some other issues since I posted this (immobiliser related as the car wouldn't even start) but think I've got the limp mode narrowed down to a dodgy throttle pedal after scanning the fault codes.

The EML light never flashed, but is constantly on due to a P0420 code for the lambda.

With regards to the high rpm bit I meant was when you get that extra kick from about 5k. I didn't realise that VVT was active from so low down in the revs - the more you know!

I have a new coolant temp sensor and intake temp sensor on the way just in case it still happens.

Trying to get to the bottom of the immobiliser issue but should have that sorted by the end of the day.

Hello buddy , was the issue the throttle pedal at the end . I got a similar issue and I have the exact same code as you have.

 

[Kiffle]

Hello buddy , was the issue the throttle pedal at the end . I got a similar issue and I have the exact same code as you have.

After I posted the last response all I did was disconnect the battery and leave it overnight. When I came back to it in the morning it fired right up - didn't actually change anything and has been fine ever since. No real clue what the issue was, just seemed to have a funny couple of days!

 

[Suspect]

Interesting , upon reading this I think I have read another thread on the forum and they mentioned something about the battery aswell.

during lock down my 182 did not get driven much and I needed a new battery.I have recently brought a new battery and changed it.
Will try disconnecting the battery tomorrow and see if that makes a difference.

I am day by day thinking this is a job for a auto electrician or maybe just as simple as changing something but not sure what exactly to change