So I have a fault code - P0171.

 

I've been told it's a maf/map sensor. 

 

Where the hell Is it? 😂 

Thanks In advance. 

Very unlikely  to be the sensor itself, more likely an air leak. Check brake servo vac hose as a first suspect. Often crack at the junctions of the hard plastic sections. Look and feel for such damage.

 

MAP sensor is on end of intake manifold near dipstick tube.

 

Some interesting absences from your battery-top fuseholder. 🤨

 

Edited 25 June, 20241 yr by Breezy_Pete

Thanks, Pete.

 

I'm not a mechanic by any means. Could you also tell me what/where the brake servo vac hose is? Really appreciate the help.

As for the battery top fuse holder, whats missing?

I got the car for nothing so I can't complain really. 

4 minutes ago, ash94 said:

Thanks, Pete.

 

I'm not a mechanic by any means. Could you also tell me what/where the brake servo vac hose is? Really appreciate the help.

As for the battery top fuse holder, whats missing?

I got the car for nothing so I can't complain really. 

The protective cover for the terminals on the fuse board - you really do not want to drop any metal object across those.

Edited 26 June, 20241 yr by Warrior193
added information

Brake servo is the round black thing on the back wall of the engine bay, behind the brake fluid reservoir.

The only hose coming from that to the engine is the brake servo vacuum hose.

 

I was referring to a couple of strip fuses as being mysteriously absent from the fusebox.

ABS pump fuse and one for radiator fans, I think.

 

 

Engine idling ok?

Just mot'd it and this is what it failed on

 

 

Is this this brake servo hose? If so, why is it full of coolant? I want to take it off to make sure it has no splits... that being said, if it hasn't leaked coolant, surely there's no splits? 

Brake servo uses vacuum not coolant!

On 26/06/2024 at 21:34, Breezy_Pete said:

Brake servo is the round black thing on the back wall of the engine bay, behind the brake fluid reservoir.

The only hose coming from that to the engine is the brake servo vacuum hose.

 

 

 

No splits in brake servo hose ( yes I found it behind the brake fluid reservoir lol). However I don't think the hose sits very well in the brake servo. I don't know how easy it should be to pull the hose out of the brake servo but it pulls out very easily. 

On 30/06/2024 at 14:19, charca0 said:

Engine idling ok?

No, upon start up, it sits over 1000 and then after about 5 mins drops down below 1000 then starts misfiring and engine running very rough.

12 minutes ago, ash94 said:

No splits in brake servo hose ( yes I found it behind the brake fluid reservoir lol). However I don't think the hose sits very well in the brake servo. I don't know how easy it should be to pull the hose out of the brake servo but it pulls out very easily. 

It should be quite difficult to remove from servo, unless you deplete the vacuum by pumping brake pedal a few times first. Suggests the one-way valve may have failed, possibly?

On 08/08/2024 at 22:02, Breezy_Pete said:

It should be quite difficult to remove from servo, unless you deplete the vacuum by pumping brake pedal a few times first. Suggests the one-way valve may have failed, possibly?

One way valve? Sorry I'm pretty useless when it comes to knowing the components and terminology that's associated. Is the valve on the engine that the hose goes on to? I've also noticed a strong smell of fuel from the exhaust whilst it's running. Could the fuel system be the cause of a misfire?

One way valve is part of the servo vacuum hose, near the engine end of it. 

With engine cover off, it should be easy to see the entire hose end to end.

 

Very unlikely that the fuel system has anything to do with the misfire. 

 

You may need some help from a garage?