- My brother has a Peugeot 207 2007 estate 1.4 petrol with 98k on the clock that wont start, weve had the ecu checked by specialists replaced camshaft and crankshaft sensors, new plugs and coils and yet it still wont start. It comes up with economy mode on the dash an the only code left showing is for the throttle postion sensor but that shouldnt stop it starting? Strange thing is it used to run albiet badly and show anti pollution fault but now just says economy mode an wont start however economy mode should not stop it starting either. Its also had a new battery.. Any suggestions will be much appreciated.
What’s the position of the throttle? Does it open up when you’re trying to start? It may stay shut, and you want it somewhat open.
Take out a spark plug, keep it connected to the coil and ground it on the threads body, does the spark fire?
This basically checks if the issue is fuel, air, or spark (it might be a combination)
used to run albiet badly and show anti pollution fault
That’s not a good sign at all! Complicates things a lot.
Do you remember what were the fault codes or faults? My intuition screams to try and start it without the exhaust manifold.
(TPS FAULT…) but that shouldnt stop it starting?
It’s French… it might, but I kind of doubt it too.
The TPS is used to calculate ignition parameters and with how irrational these systems are on old French / Italian cars - it just might be enough.
Check what is the TPS is reading, and move the throttle (key position II, gas pedal) to see if the readings are logical - if they aren’t try to open the throttle to a position that matches the TPS reading and start.
It’s ingesting in general to know what it does to the throttle on startup.
Other steps I’d try include, check the intake manifold for foreign objects, check all fuses (don’t swap), clean every sensor, put a scope on CPS, etc.
Thanks for reply..
OK, I have tested the plugs against ground and there is no spark.
I'm unsure of the throttle position but the plugs were rich with fuel when removed to test them an strong smell of fuel when cranking so I'd say there's plenty of fuel getting to the engine.
Also the car has had a brand new manifold fitted along with new centre pipe so pretty sure there's no obstructions.
All of these reasons are what is pointing me to thinking its a key transponder / immobiliser issue because I cannot see any reason for it not to fire up other than no spark so guessing the immobiliser is stopping it sparking?
Also we have checked all the fuses.
When I say it ran but albeit badly I should clarify that the car had a miss fire and a blow on the exhaust so that's the cause for the anti pollution fault but it has had new exhaust, new plugs and new coils.
Also when changed the plugs the 2 outer plugs were fowled with oil so we changed the rocker cover gasket aswell.
if the spark was tested against the car body as a ground and there's no spark
Assuming the are no blown fuses
It could be immobiliser fault, it could be bad data from sensors that makes the ECU not try to create any sparks.
(Also I'd try to see wet/dry compression to see if it's worth saving)
OK I've been doing some reading and from what I gather if it was an immobiliser fault usually it would say anti theft fault or immobiliser fault on the dash but it just shows economy mode active which should clear once the vehicle starts, although I'm not ruling this out.
A couple weeks before the car stopped starting my brother did fit new cam and crank shaft sensors which were cheap crap off ebay! I'm wondering if one of those have gone bad?
He was the one that checked the fuses so I'm going to beep test every fuse in a moment just so I'm 100% sure one hasn't been missed.
And yes I guess a compression test would be worthwhile.
Yes, Crank and Cam sensors are a VERY likely cause!
Not only do they need to be quality parts, most also need to be properly set (requires skill)
And crank/cam sensors can cause it not to fire the sparks / fire them not at the right time.
Scan it for codes. Check your fuel pressure and fuel filter.
It's been scanned and only code showing is for throttle position sensor but I don't believe this would stop it from starting just run rough. And it has had a full service so has new fuel filter. I think it's an immobiliser issue as there is no spark at the plugs but power at the coils