Peugeot 207 1.4 8V Petrol engine running rough.
Discussion
Hi
My Wife's 2008 Peugeot 207 8V 1.4 petrol has 59K on it. The engine was replaced last week after the head gasket kept failing (3 times in 2 years).
The engine is a used unit and came without ancillaries such as the intake and exhaust manifolds. The problem of coolant leaking is now fixed.
The original engine showed some rough running at between 1500rpm and 1900rpm. When in that rev range it would hesitate and refuse to rev any higher until the throttle was pushed full and then the revs went up to the limiter. It would do this in any gear, at any speed including whilst parked up and in neutral.
The new engine is doing exactly the same.
When the rev gauge enters 1500 to 1900rpm it starts do a little dance, up and down, up and down with the engine note matching. Then as the throttle is pushed to the floor the revs pick up and it runs fine.
Whilst the car is driving in any gear over 1900rpm it runs great, accelerates and drives smoothly.
It also appears somewhat intermittent.
From what I've read across the web, it's a common problem with this and the 16v engine, but there lacks a solution.
Anyone have any suggestions on a fix please?
Thanks
Stuart
My Wife's 2008 Peugeot 207 8V 1.4 petrol has 59K on it. The engine was replaced last week after the head gasket kept failing (3 times in 2 years).
The engine is a used unit and came without ancillaries such as the intake and exhaust manifolds. The problem of coolant leaking is now fixed.
The original engine showed some rough running at between 1500rpm and 1900rpm. When in that rev range it would hesitate and refuse to rev any higher until the throttle was pushed full and then the revs went up to the limiter. It would do this in any gear, at any speed including whilst parked up and in neutral.
The new engine is doing exactly the same.
When the rev gauge enters 1500 to 1900rpm it starts do a little dance, up and down, up and down with the engine note matching. Then as the throttle is pushed to the floor the revs pick up and it runs fine.
Whilst the car is driving in any gear over 1900rpm it runs great, accelerates and drives smoothly.
It also appears somewhat intermittent.
From what I've read across the web, it's a common problem with this and the 16v engine, but there lacks a solution.
Anyone have any suggestions on a fix please?
Thanks
Stuart
I assume that the throttle opening properly - wouldn't hurt to confirm that.
If that's the case, the problem would need to be either the wrong fueling or a week spark or the wrong spark timing.
Fueling seems more likely to me. A bad signal from either the throttle position sensor or the load sensor could cause incorrect fueling. One way to look for that is to put a NOID lamp across one of the injectors. This gets brighter the longer the injectors are open, and you should normally see a pretty obvious response to the throttle.
If something is affecting the fueling it might throw also up a fault code.
You could check the spark timing using a strobe and the spark strength using a passive strobe.
If that's the case, the problem would need to be either the wrong fueling or a week spark or the wrong spark timing.
Fueling seems more likely to me. A bad signal from either the throttle position sensor or the load sensor could cause incorrect fueling. One way to look for that is to put a NOID lamp across one of the injectors. This gets brighter the longer the injectors are open, and you should normally see a pretty obvious response to the throttle.
If something is affecting the fueling it might throw also up a fault code.
You could check the spark timing using a strobe and the spark strength using a passive strobe.
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