4200 - Vapour canister purge valve

TimR

Member
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923
A simple code reader should be able to tell you what engine temp the ECU is being told it’s running at as the obd2 port gets its data from the ECU.
Sure - 87.8*C
Counter value against the error code (PO128) = 1 ( temp recorded at the time appears to be 59 )

Does the counter value denote the number of instances...?
 

doodlebug

Member
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227
A simple code reader should be able to tell you what engine temp the ECU is being told it’s running at as the obd2 port gets its data from the ECU.
I agree, but the initial fault was intermittent and never manifested itself when in for repair. Lancaster's, McGrath's and Grimaldi all have SD2/3 diagnostic kit. I can't believe they were all complicit in denying any fault was present.
 

Oneball

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1,261
Inline with what doodlebug said it would be good if you could read the ECU temp when it’s playing up.

The P0128 code is saying is that the ECU expected the car to be fully warm but it wasn’t.

Clear it and see if it comes back. But could be thermostat or fan related.

Does it take a long time to warm up?
 

TimR

Member
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923
Just to add to this..
I have just experienced the poor engine throttle response issue in unmistakable guise this morning...
The car was cold. It disappeared after the car was warm but it also generated a fault code. PO421 ....
The code could be triggered by faulty O2 sensors but having looked at the O2 sensor data, and frankly dismissing these as out of spec, I tend to think not...
The hotstart thing as was explained, isnt going to happen because of open loop ..So even more to suggest Im looking at the wrong thing ( Ive now changed the coolant temp sensor, crank sensor and purge valve..)
I want to ask how common is it that the facelift catalytic converters fail...?
I know the early cars had issues. I fear I need to look at theses closely..?

PO421-cartalytic warmup efficiency below threshold ( bank 2 in my case - )

Poor starting may come from here. ( Or am I reading too much google for my own good ?) Poor running/throttle response would also be a symptom ( deffo when cold I understand?)

Thoughts...?

cheers
 

Oneball

Member
Messages
1,261
With that code I’d check the secondary air pump system. There’s a peirburg pump, some electrics, pipe work and the silver can like valves.

Pumps can seize and valves stick.

Doesn’t usually affect starting but will impact initial running when cold.
 

TimR

Member
Messages
923
With that code I’d check the secondary air pump system. There’s a peirburg pump, some electrics, pipe work and the silver can like valves.

Pumps can seize and valves stick.

Doesn’t usually affect starting but will impact initial running when cold.
Good point
Not clear how a secondary air pump issue doesn’t pop a related code( it has in tha past)
What you say makes sense....
 

hashluck

Member
Messages
460
With that code I’d check the secondary air pump system. There’s a peirburg pump, some electrics, pipe work and the silver can like valves.

Pumps can seize and valves stick.

Doesn’t usually affect starting but will impact initial running when cold.
This was my thoughts. Check the pipe that runs from the pump as well for leaks
 

Oneball

Member
Messages
1,261
Good point
Not clear how a secondary air pump issue doesn’t pop a related code( it has in tha past)
What you say makes sense....
Only speaking from BMW experience here but a stuck valve rather the pump doesn’t often throw a code.
 

TimR

Member
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923
Cleared the code and its not returned..
They do love to pop a EML these cars, blimey !

On another note, Ive not had the start issue for a while...dare I venture to suggest its cured?
Also, replaced the spring, non-return oil valve in the top & it's stopped rattling on start up too....
Happy daze!
 

jluis

Member
Messages
1,585
My 3200 has the hot start issue (on hot days mostly) and a leaking purge valve (Tested it with a vacuum pump) meaning that it will suck a rich mixture when starting.
It also smells of fuel like described here.
I found that on those hot days if I open the gas cap to let the pressure out, it will start easily afterwards.

I have the valve to replace it but haven't found the time yet.