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Running Rough When Cold


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#1 Dan r

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Posted 30 June 2019 - 08:02 AM

The last few times I've started the vx (stage 2 sc with a Courtney calibration) from cold it's run extremely rough and is difficult to keep it running, it cut out this morning when trying to pull away and threw up the EML, I had my scan gauge to clear it so managed to get home OK.

Code was P0107 which is MAP sensor fault apparently but this may have just been because it was running so rough it spiked at a point out of the range maybe?

The cold calibration is rubbish so drives badly for the first couple of minutes usually, but this is very difficult to keep it running which is never a problem.

When it's properly hot it feels perfect so wondered if it could be the egr valve stuck open? It's still in operation as it's not caused a problem before.

Just be good to see if anyone could confirm this is likely or if it could be something else as I'm really busy at the moment so didn't want to waste any time.

I have opcom which I could confirm the egr is operating properly or check something else.

Thanks in advance.
Dan

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#2 vocky

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Posted 30 June 2019 - 08:53 AM

EGR should be blanked off on a SC conversion, so will not cause any issues.

 

Faulty MAP sensors are a common problem with a Courtenay mapped SC conversion, mainly caused by secondhand MAP sensors being used or aftermarket MAP sensors.

 

So always try and use a new genuine MAP sensor, these don't cause as many problems.

 

The Dutch mapped cars use a TMAP and these do not suffer the same issue, even with secondhand sensors.



#3 Dan r

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Posted 30 June 2019 - 08:57 AM

Why would the map sensor only cause this when it's cold?
I'll check when I have time but I think the egr isn't blanked off

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#4 vocky

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Posted 30 June 2019 - 09:07 AM

there is no connection to the inlet manifold for an EGR, so all it would do if not blanked off is leak and make a noise.

 

Having done quite a few SC conversions over the years my experience for a rough start up is a duff MAP sensor, however a faulty throttle body can also give similar issues. That said you had a MAP error code, so start with a new MAP sensor

 

P0107 Manifold Absolute Pressure (MAP) Sensor Circuit Low Voltage



#5 Dan r

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Posted 30 June 2019 - 09:08 AM

Great, thanks for your help.
I'll let you know how I get on.


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#6 Dan r

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Posted 30 June 2019 - 09:41 AM

Is this the correct part number?
Bosch 0261230042

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#7 Dan r

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Posted 30 June 2019 - 09:47 AM

... The one I have hasn't got a part number on it

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#8 vocky

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Posted 30 June 2019 - 09:58 AM

that is the TMAP sensor, so not for the courtenay mapping

 

Courtenay sell them for £63 https://www.courtena...Sensor-Z22SE-SC



#9 Dan r

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Posted 30 June 2019 - 09:59 AM

OK thanks again

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#10 vocky

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Posted 30 June 2019 - 09:59 AM

correct part number is 16235939 according to this thread - http://www.vx220.org...-sc-map-sensor/



#11 PaulCP

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Posted 30 June 2019 - 11:51 AM

EGR not blanked off, it was a very early (2nd) Courtenay conversion although was updated as they developed the conversion.

I had a blanking plate and cheater. If I didn’t give it to you I’ll check around the garage

#12 Dan r

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Posted 30 June 2019 - 11:54 AM

Cheers Paul, its blanked off on the inlet side of the head though where it would go into the manifold, so wouldn't have any effect on running.


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#13 Dan r

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Posted 04 July 2019 - 04:25 PM

Thanks again vocky, map sensor has fixed it. 👍


Still can't really understand why it would be fine when it's hot, assume it's a sensitivity issue when it's cold?

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#14 siztenboots

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Posted 05 July 2019 - 08:42 AM

could be a sealant problem which you notice more from cold and high vacuum






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