Which sensor was it?


I just had to drive it. Was doing 50 mph gently applied throttle and it wouldn't pull at all. In fact it was slowing down. It was backfiring a little. Dipped the clutch and it died. Restarted it and the car fired up. But it sounds quieter and has less power. I wonder if it just shagged my cat.

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See the sheer power and might of the lesser known burrowing owl.

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Old pugs don't die they just get faster

I have a brand new green temperature sensor to try in that case. Although according to pug planet it was reading the right temps etc.

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See the sheer power and might of the lesser known burrowing owl.

From what I remember mine were a week old and they looked very fooked

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Old pugs don't die they just get faster

The green temp sensor is working perfectly. It shows the same temp as the dash gauge does when you look on the laptop. Also tried unplugging it the other day and made it run a lot worse. Same as unplugging any of the other sensors did.

Plugs were all even milky coffee colour on the tips as they should be. No obvious defects or chase lines down the side of the coils from arcing or anything. I will say the old lambda sensor was a bit sooty and black though but no idea how old it was. This cars always sailed through emissions tests when I've done MOT'S on it previously.

The two times I've had it running well for a good while has been after the battery has been off for several hours. Then started and run on idle till warm then driven normally. It's remained perfectly fine for at least half hour or more. Aaron came by after work on Wednesday evening and I'd had it running for ages after fixing the aircon and replacing the last few bits. Was running sweet. I then took it up the road for a short run and it was spot on. Aaron then drove it 10 mins later and it was stalling popping banging full on misfire at low revs under load....
It's like the ecu learns its parameters fine then suddenly looses the ability to work the coils properly.

No amount of loom wiggling anywhere seems to provoke it either and no codes also suggests to me that the loom is fine. Disconnecting any one of the Injectors or coils produces a noticeable good miss on that cylinder so all 4 have some from of fuel and spark.

To try a soft unlocked ecu do I have to disconnect just the immobiliser pickup ring or the immobiliser ecu as well then fit the ecu and start normally? Never had to mess about with soft unlocked ones before.... I would think disconnect immobiliser ecu?

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Black power baby! SUUUUUPERCHARGED
Seat Leon FR TDI 190BHP 300lbft daily gti-6 killer :p
12x 306's owned so far

Cambelts, clutches, service work carried out on All makes and models, Peugeot Citroen / mitsubishi specialist.
Pug planet / Citroen Lexia diagnostics / code reads available.

Ever so joyous update on this.... I told Aaron to take the car and try it out with some injector cleaner in and see how it goes. Wasn't long before it messed about again and massively backfired a few times. Then he said it was gutless and the exhaust had become really quiet which is most unlike a magnex

So we both suspected the backfiring was happening pre cat and it's probably imploded the cat and part blocked it... yup... removed the cat and it's cracked it internally in a load of places and blocked it up so off came that for now and on went a decat pipe. Now obviously louder but no restrictions in the exhaust and no chance of ruining another genuine cat.... I also removed the plugs again. This time they were sooted up and black.... Maybe because the cat had blocked so wasn't getting enough air through to fuel ratio or because it's started overfueling massively hence the backfires. So replaced the plugs with brand new BKR6EK.

Me and Aaron had a tinker this evening.... thought we would change more bits we have spares for already. Aaron had a brand new in bag green ecu coolant sensor. I believed the current one to be fine as it's reading fine on PP but may as well try as it controls the fueling. Also changed the knock sensor which was a bit of a fiddle bit managed it with magnets and wobble sockets and a lot of swearing without taking the inlet off! Wouldn't have stood a chance if it had a helmholtz resonator on the inlet lol.

Car ran fine on tick over fine on first road test... turned it off waited 20 mins or so and ran again and almost instantly messed about as per. Misfiring under load cutting out misfiring or flooding itself when you blip the throttle hard from idle.

Back to square one. Battery off changed injectors and rail for spares. Ran lovely for a good 20 mins and a decent length road test only one minor splutter then perfect again.

Switched off for 10 mins or so restarted and wasn't too long before it misfired again.


So... ecu? Seems fine when reset and until it's turned off and left and it's been like that for some time.... possibly even the whole time. Once ecu had learned all its parameters and been turned off it runs like s**t.....

We have a soft unlocked ecu borrowed from demondriverdan so I'll try that tomorrow lunch.


If anyone has any other ideas please feel free to SHOUT

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Black power baby! SUUUUUPERCHARGED
Seat Leon FR TDI 190BHP 300lbft daily gti-6 killer :p
12x 306's owned so far

Cambelts, clutches, service work carried out on All makes and models, Peugeot Citroen / mitsubishi specialist.
Pug planet / Citroen Lexia diagnostics / code reads available.

No point. It'd only misfire.

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See the sheer power and might of the lesser known burrowing owl.

Fuel pressure regulator have you checked what fuel pressure you're getting?

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Super high boost Completed, destroyer of gearboxes and 160mph club

Bad earth cables? Can't say I've come across this one before?

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Super high boost Completed, destroyer of gearboxes and 160mph club

got for a drive with PP and see what readings you get when it cocks about.

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need a part number? get on here - http://public.servicebox.peugeot.com

Bring on the Trumpets.

Yup did at lunch disconnected immob ecu plugs and pickup ring fired up fine ran till warm fine then switched off while I finished off a 1.6hdi cam belt job... restarted it and gradually started missing then cut out completely struggled to restart then missing a bit then cleared again.

Anyone got any matches?

Will have to do that when I get time WP but have had it cooking about whilst idling and plugged it in and my rallye running next to each other and compared readings. Only difference was the ignition timing was more advanced on Aaron's for a while then went back to normal and ran ok again.

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Black power baby! SUUUUUPERCHARGED
Seat Leon FR TDI 190BHP 300lbft daily gti-6 killer :p
12x 306's owned so far

Cambelts, clutches, service work carried out on All makes and models, Peugeot Citroen / mitsubishi specialist.
Pug planet / Citroen Lexia diagnostics / code reads available.

Which would lead me to cam or crank sensors as they are what dictates the firing. Crank is brand new from GSF French made and same make as I have on my 6 after mine died a couple of years ago. Cam sensor we have several spare though unknown if good but if it's disconnected logs a fault straight away saying cylinder 1 detection sensor open circuit.

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Black power baby! SUUUUUPERCHARGED
Seat Leon FR TDI 190BHP 300lbft daily gti-6 killer :p
12x 306's owned so far

Cambelts, clutches, service work carried out on All makes and models, Peugeot Citroen / mitsubishi specialist.
Pug planet / Citroen Lexia diagnostics / code reads available.

Have you tried the fuel pump relay I had tick over issues due to my fuel pump relay being faulty. Mine was reving too high. Not the same issue as yours but give it a try you may be in luck the same as I was.

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http://www.306gti6.com/forum/showthread.php?id=163869