306 GTI 6 Bogging Down

[CitroJim]

Wow! Pleased it's sorted David

[Gabee]

We had another look at the car with Peugeot Planet today after he managed to get the diagnostics port wired in and working.

Initially there were 5 errors on the diagnostics which we believe were caused by sensors being unplugged and plugged back in during diagnostics.

There was 1 permanent fault from the purge canister solenoid valve which we'd expect as it's been removed and bypassed.

There were 4 intermittent faults from:

Inlet Air Thermistor Function - Short circuit to positive or open circuit.
Coolant Thermistor Function - Short circuit to positive or open circuit.
Throttle Potentiometer Function - Short circuit to positive or open circuit.
Inlet Manifold Pressure Sensor Function - Open circuit or short circuit to earth.

We cleared all of the codes and the only one to return was the purge canister code.

Then using the live data we managed to get the below information:

Ignition Values


Injection Values


Sensor Values


I thought the advance looked a bit high but we compared that to his other 306 GTi6 and it was identical. All of the other sensors were pretty much spot on when compared to the other car as well.

When stationary the car idles perfectly and it revs really quickly. It's a bit smokey and smells a bit of unburnt fuel. However, when driving it, it struggles to drive up hills at 30mph even when changing down gears.

The timing has been checked and triple checked and they've used a solid pulley to make sure that the outer of the original one hadn't moved.

Part of me is wondering if it could be a choked exhaust that's causing it so I've suggested removing the lambda sensor to see if allowing it to breathe makes any difference but I'm not holding out much hope.

Any further suggestions would be welcomed!

David.

Hi!
I see that the post is old, but I would like to ask if you could give me information about the wiring of the diagnostic connector?
I would have a similar problem, I would like to read the data directly from the engine electronics, but I don't have a diagnostic connector either.
Thanks!

[CitroJim]

You can only read the diagnostics using the correct tools (Peugeot Planet/Diagbox) and the appropriate Vehicle Communications Interface (VCI).

You will have a standard OBD2 diagnostic connector wired as per the standard.

[Gabee]

You can only read the diagnostics using the correct tools (Peugeot Planet/Diagbox) and the appropriate Vehicle Communications Interface (VCI).

You will have a standard OBD2 diagnostic connector wired as per the standard.

Hi.
As I wrote, there is currently no diagnostic connector in the car.
That's why I wrote my previous comment, because DHallworth, who opened the topic, wrote in his first comment that he would connect the cables coming directly from the engine electronics to a diagnostic connector.
Similarly, I would like to build a subsequent diagnostic connector, exclusively for testing the engine.
I wanted to ask for help with this.

[CitroJim]

It's most odd it has no diagnostic connector. Maybe the wiring diagrams you require are available on here if you upgrade your membership.

[DHallworth]

We did wire out the diagnostics socket using the pinouts in this thread here:

viewtopic.php?t=75954

It worked fine and got us the connectivity we needed.

David.