Technical Flat Spot
- Thread starter BRAVOOO
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Technical Flat Spot
engine?
milage?
rpm flat spot occurs at?
when last serviced?
tick over erratic when cold or warm or both?
had any work done recently?
milage?
rpm flat spot occurs at?
when last serviced?
tick over erratic when cold or warm or both?
had any work done recently?
when you say a flat spot it implys a spot in the power delivery where you feel like you loose power, as Jug said, what rpm band is this happening in? Ie 3500-4000?
right, that sounds like constant hesitation and rough idle., so most likely a sensor fault. i would suggest you get a diagnostic done to read any fault codes stored in the ecu (£65 @ dealer).
once you have a good idea what the fault is come back to us and we'll try to make sure you can fix it as cheaply as possible.
If you had a flat spot at all rpm you wouldnt have ANY power and would just sit there at idle. A flat spot is the point on a power delivery curve where you have a blip in power, a flat spot, before and after the power delivery is fine.
chiefster1976
New member
similar prob myself..only minor....excellerating in each gear between 1000- 2500 is the flat spot, then near to the point the turbo kicks in and its fine!!! ( 1.9 TD 100 SX 99V..)
would taking off the NEG lead for 30 mins approx help to reset codes? thought this would be the first and easiest way???
ONE problem i only have two blue keys and NO red key. if i take off neg lead will i be able to start the car again?????
would taking off the NEG lead for 30 mins approx help to reset codes? thought this would be the first and easiest way???
ONE problem i only have two blue keys and NO red key. if i take off neg lead will i be able to start the car again?????
similar prob myself..only minor....excellerating in each gear between 1000- 2500 is the flat spot, then near to the point the turbo kicks in and its fine!!! ( 1.9 TD 100 SX 99V..)
would taking off the NEG lead for 30 mins approx help to reset codes? thought this would be the first and easiest way???
ONE problem i only have two blue keys and NO red key. if i take off neg lead will i be able to start the car again?????
no problem with not having red key.
disconnecting the battery will reset the ecu,m by that i mean it will lose all its learnt operating parameters. however this will not reset or remove and fault codes, you can only do that manually using the fiat examiner or similar. you will know when the fault is fixed because the car will start to work properly, there is no need to clear codes to get it work properly.
imo it sounds like you are describing turbo leg. if the injection system fault light is not coming on currently, you know the ecu is not registering any faults. the light only comes on when there is a fault occuring.
similar prob myself..only minor....excellerating in each gear between 1000- 2500 is the flat spot, then near to the point the turbo kicks in and its fine!!! ( 1.9 TD 100 SX 99V..)
would taking off the NEG lead for 30 mins approx help to reset codes? thought this would be the first and easiest way???
ONE problem i only have two blue keys and NO red key. if i take off neg lead will i be able to start the car again?????
Yeah that flat spot is called owning a diesel
Don't be afraid of driving a Fiat diesel engine hard. Don't try to drive it so you just drop in the next gear at 1000rpm.. You get best efficiency when the turbo is forcing air into the engine. How long have you been driving the car?
chiefster1976
New member
Yeah that flat spot is called owning a diesel
Don't be afraid of driving a Fiat diesel engine hard. Don't try to drive it so you just drop in the next gear at 1000rpm.. You get best efficiency when the turbo is forcing air into the engine. How long have you been driving the car?
Hey....Had the car only a week..Changed all filters/oil/air/fuel...oil change..
thought about glow plugs but been told on this forum that glow plugs just start the car not in use in the running of the car!! This might sound daft but how does the diesel burn if the plugs dont operate whilst engine runs? ( used to petrol cars.)
Stuck a load of diesel REDEX and gave it a good run...really suprised how throaty and keen the diesel engine is except the flat spot!! For under a grand im glad i chose this run about instead of the 306 meridien diesel..save me at least a grand!!!:slayer:
that aside i have previously run a leon cupra 20VT. 180. and a leon 20V non turbo before that and the non turbo car had this similar probem of a flat spot at 1-2500REVS.....
Problem cured with leon after cleaning the MAF and taking neg lead off as described on the SEAT forum...
Just wondering if the MAF cleaning on the BRAVO will help???
compression.
the diesel ignites when it is injected because the air in the cylinder has been compressed so much that it is hot enough to cause ignition. glow plugs are needed when starting because the engine is cold so the compressed air will not achieve the required temperature. once ignition is occuring the glow plugs can switch off and let compression take over.
its a completely different approach to a petrol engine.
btw, you have a JTD since your car is a V reg, very different to a TD. (you have a much better engine).
personally i dont think you have a problem, from your descripiton it soulds exactly like i would expoect the car to behave. you need to adapt your driving style to suit the diesel, its a completely different beast to your previous cars.
i would strongly recommend an ecu remap. you get excellent gains in power and torque.
Problems with the MAF typically show themselves as a flatline over 3000rpm. Unplugging the MAF causes the engine to use other values for the ECU - and if the MAF was to blame - performance over 3000rpm returns.
