Hi there. My name is Adrian and my first post here. I am in need off some assistance with my wifes 2005 307 SW 1.6 16 valve petrol engine.
Basically it started to hold back from cold. No warning lights appeared and this would rectifiy itself after several seconds.
Well this fault has developed further last week into hard to start. Now when it does the car struggles to idol. On acceleration to try and keep engine running there is sever hesitation. Sounds like a really bad misfire and really lumpy idol. There are no water, or oil leaks. All very strange.
So I started going through the helpful posts on here and drawn a blank.
I replaced the MAP sensor. Pattern part.
I have removed and cleaned the throttle body.
I have fitted new spark plugs as they needed doing.
However the fault still persisted.
When I fitted the new pattern MAP sensor, because it seemed the most likely cause and it was also a cheap item to rule out, it did activate the engine fault light. This never appeared with old sensor oddly. I then gave up.
Unplugging the MAP sensor forced car into limp mode. But it drives much better like this. Just lacks power, but it least the engine does not seem to misfire so this ruled out Ignition coil pack.
I drove the car to my local garage to take a look and plug in more advance diagnostic than I have here. I have used this garage for years and they know I used to be a ex mechanic, so they are a genuine company I trust.
They put their diagnostic equipment on the car and found that their were a couple of codes. I can't remember them of the top of my head.
One was throttle actuator motor and the other fault was Inlet air temperature was reading -40f. The car runs very rich and I believe it is all down to the IAT sensor reading. The new MAP sensor was a aftermarket part and the garage said I need a genuine one which is now on order.
However, I am intrigued about testing the original sensor and new pattern sensor. So this is why I need help testing the MAP plug and the MAP sensor. I cannot find any info on pin configuration etc, or expected plug voltages, or grounds.
Can someone please help me with the MAP sensor expected plug voltages and the continuity tests to ecu as I need to check the loom. Also with ohms readings from the MAP sensor.
I did unplug the MAP sensor from the loom. None of the 4 pins on the wiring loom read as a chassis earth. May be ECU earthed somehow. Also very oddly when unplugged the other 3 connections in loom to sensor read 5V sitting on them. Now it might be correct, but I have no idea. So I may have a damaged wire somewhere or ECU fault. I really need to find out where the other end of the the MAP sensor loom is going? Any ideas.
Help would be much appreciated. Please excuse my spelling. Not great at best of times and on a mobile it is worse.
Basically it started to hold back from cold. No warning lights appeared and this would rectifiy itself after several seconds.
Well this fault has developed further last week into hard to start. Now when it does the car struggles to idol. On acceleration to try and keep engine running there is sever hesitation. Sounds like a really bad misfire and really lumpy idol. There are no water, or oil leaks. All very strange.
So I started going through the helpful posts on here and drawn a blank.
I replaced the MAP sensor. Pattern part.
I have removed and cleaned the throttle body.
I have fitted new spark plugs as they needed doing.
However the fault still persisted.
When I fitted the new pattern MAP sensor, because it seemed the most likely cause and it was also a cheap item to rule out, it did activate the engine fault light. This never appeared with old sensor oddly. I then gave up.
Unplugging the MAP sensor forced car into limp mode. But it drives much better like this. Just lacks power, but it least the engine does not seem to misfire so this ruled out Ignition coil pack.
I drove the car to my local garage to take a look and plug in more advance diagnostic than I have here. I have used this garage for years and they know I used to be a ex mechanic, so they are a genuine company I trust.
They put their diagnostic equipment on the car and found that their were a couple of codes. I can't remember them of the top of my head.
One was throttle actuator motor and the other fault was Inlet air temperature was reading -40f. The car runs very rich and I believe it is all down to the IAT sensor reading. The new MAP sensor was a aftermarket part and the garage said I need a genuine one which is now on order.
However, I am intrigued about testing the original sensor and new pattern sensor. So this is why I need help testing the MAP plug and the MAP sensor. I cannot find any info on pin configuration etc, or expected plug voltages, or grounds.
Can someone please help me with the MAP sensor expected plug voltages and the continuity tests to ecu as I need to check the loom. Also with ohms readings from the MAP sensor.
I did unplug the MAP sensor from the loom. None of the 4 pins on the wiring loom read as a chassis earth. May be ECU earthed somehow. Also very oddly when unplugged the other 3 connections in loom to sensor read 5V sitting on them. Now it might be correct, but I have no idea. So I may have a damaged wire somewhere or ECU fault. I really need to find out where the other end of the the MAP sensor loom is going? Any ideas.
Help would be much appreciated. Please excuse my spelling. Not great at best of times and on a mobile it is worse.