Cleaning MAP sensor

Original Poster

89 posts

8 months

Saturday 27th April

What can I safely clean a MAP sensor with on my Peugeot 307 1.6 petrol, can I just soak it in alcohol overnight and the let it dry before refitting it?

Would like to clean the air-flow sensor as well but not sure that is easily accessible.

Original Poster

89 posts

8 months

Tuesday 30th April

Reason for thinking about cleaning these is because I have a very slight hesitation/surge at low speed and slightly rough idle when warm. Not enough to show on the rev counter which is perfectly stable. Almost feels like ECU is weakening-off the mixture too much.

This is on a 90k Peugeot TU5JP4 engine (1.6 16v petrol). Economy wise getting just under 30mpg but that is on an average speed of 12mph so probably about right.

Have got the Lexia-3 diagnostic interface device and software but not sure what to look for in there to help solve this.

Original Poster

89 posts

8 months

Saturday 4th May

Turns out it wasn't the MAP sensor but a faulty spark-plug in the new set that I had fitted.

I had replaced the original Bosch FR7MEs with a set of NGK Iridium ILFR6Bs which are listed as compatible and suitable for this TU5JP4 engine. Had only just got the car and so was doing a full service and various other jobs at the same time and hadn't realised that was when the hesitation had started.

Now refitted the old Bosch FR7MEs and runs fine.

Question now is apart from refitting them one-by-one how can I identify which of the new plugs is faulty?

Original Poster

89 posts

8 months

Monday 6th May

GreenV8S said:

If the problem is specific to a single plug which has been misfiring, I'd have thought it would be apparent from the state of the plug.

Interesting you say that, I would have thought the same but all plugs look fine certainly none that look any different to the rest.

Make me wonder if for some reason the Iridium tipped plugs just don't suit this engine but can't see why.

Original Poster

89 posts

8 months