A friend of mine has a Cinq, which I converted to a 1242 about a year ago. I used a very low mileage SPI engine and it’s been running beautifully.
A couple of weeks ago it flashed the fault light a couple of times, then it missed at a traffic light, followed by driving home perfectly normally. The next day it went down to two cylinders, followed by a total refusal to re-start. (I witnessed none of this it is anecdotal). It got towed into a local garage, which diagnosed a faulty crank sensor and replaced it. It then ran for about 10 miles, though apparently not quite as sweetly as normal.
It then started to run chronically rich, sounds like a bag of nails, won’t really rev, though it starts easily. It is certainly not driveable. Yesterday I picked it up and took it to Days in Milton Keynes to get the fault codes read. The faults it throws up is MAP sensor and coils.
Today I put on a MAP sensor from a running car, re set the ECU absolutely no change. Both coils are firing, but one seemed weaker and the plug was wet, I fitted one new coil and a new set of plugs, it made absolutely no difference. The old plugs are as black as the Ace of Spades.
I replaced the throttle body assembly with the original one from the car, it uses the Punto one normally, no change.
I pulled the oxygen sensor and started the car in case the cat was plugged, lot of noise still runs like a dog.
My understanding is the oxygen sensor goes open loop when the car is started from cold so it should make no difference? Besides it is only 4000 miles old. There again the crank sensor was also new when I fitted the engine.
I’m pretty sure it is timed up properly, it runs very evenly, just very rich, the timing belt and tensioner were new when I fitted the engine.
I tried an uncoded ECU from an M plate Sporting, car runs just as badly with that ECU
Could the temperature sensor be causing this?
Any other thoughts please?
A couple of weeks ago it flashed the fault light a couple of times, then it missed at a traffic light, followed by driving home perfectly normally. The next day it went down to two cylinders, followed by a total refusal to re-start. (I witnessed none of this it is anecdotal). It got towed into a local garage, which diagnosed a faulty crank sensor and replaced it. It then ran for about 10 miles, though apparently not quite as sweetly as normal.
It then started to run chronically rich, sounds like a bag of nails, won’t really rev, though it starts easily. It is certainly not driveable. Yesterday I picked it up and took it to Days in Milton Keynes to get the fault codes read. The faults it throws up is MAP sensor and coils.
Today I put on a MAP sensor from a running car, re set the ECU absolutely no change. Both coils are firing, but one seemed weaker and the plug was wet, I fitted one new coil and a new set of plugs, it made absolutely no difference. The old plugs are as black as the Ace of Spades.
I replaced the throttle body assembly with the original one from the car, it uses the Punto one normally, no change.
I pulled the oxygen sensor and started the car in case the cat was plugged, lot of noise still runs like a dog.
My understanding is the oxygen sensor goes open loop when the car is started from cold so it should make no difference? Besides it is only 4000 miles old. There again the crank sensor was also new when I fitted the engine.
I’m pretty sure it is timed up properly, it runs very evenly, just very rich, the timing belt and tensioner were new when I fitted the engine.
I tried an uncoded ECU from an M plate Sporting, car runs just as badly with that ECU
Could the temperature sensor be causing this?
Any other thoughts please?
