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Discussion Starter #1
Hi all,


Wondering if anyone can help out, just purchased a Sedona 2.9 crdi for my wife from an auction (thought I would be getting a bargain!!
). Car is a 52 reg with 64k miles, in exceptionally clean condition.... all good until I drove out the car park and the car won't rev above around 2700 rpm
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Drove the car 40 miles home, once the car slowly increases in speed it drives ok, but still won't rev above 2700rpm...

Tried plugging my car into a Snap On scanner to diagnose the problem, the brand new scanner doesn't support Kia cars


Reading the cars ecu through OBD detected no faults, disconnected the battery to 'reset' the system and remove a possible 'limp' mode....nothing.

New diesel filter, no change.

Disconnect the Airflow meter, no change...



Anyone have any suggestions please?



Antony
 

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Discussion Starter #3
Hi mate,


The car will not rev above 2700rpm in either neutral (or park as it is an auto) & when driving it wont go above 2700rpm either.



Help!!!
 

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it doesnt have a speed limiter fitted does it sounds like fuel to me check the accelarator cable .
 

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Discussion Starter #5
Hi mate,
Doesn't appear to have any limiter fitted, the auto box struggles to change gear due to the rev's not getting high enough. It changes gear fine if accelerating lightly.

I agree re fuel, the part that really puzzles me is the fact the rev's get to the exact same point each time (just over 2700rpm). I would have thought that if it were a diesel pumpor injector then the rev limit may vary??

It is almost as if it in a programmed limp mode to stop at 2700rpm. Worst part is that there doesn't appear to be any Kia specialists in my area who may have the correct computer software to read the ecu. My worst fear is the diesel pump, however, I forgot to mention that the engine management light isn't staying on?!!
 

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check the brake light switch on the new model it kills revs so you cant rev and brake ,it could be stuck ,from what i gather there is two switches in one ,might be worth testing with a meter ,sometimes if you disconnect it completely it will show as a fault on ecu ,but still worth checking,even if brake light is not on ,hope this helps
 

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hi keith thats true but his cars a 52 plate dont think they have that switch .although it does have a limp home mode but i thought the revs for that are lower than 2700.
 

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Hi.. I have a 52plate Sedona which had similar problems a few weeks ago. Cannot say if its the same cure but, it was a fuel problem not inline filter but the filter in the fuel tank. My garage believe it had never been changed. Also in there is a Gauze filter which will need to be cleaned as well in the tank. My garage started at the engine and worked backward to find the faults. they showed up as fuel probs, but took a while to fathom out. It was there for 9 days overall. Good Luck
 

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Discussion Starter #10
Thanks all for the advice so far. I visited 2 local Kia dealers on Saturday, 1 being more helpful than the other!!
Anyhow, after a bit of 'a craic' with a mechanic he has told me to pop over one night this week for a diagnostic session lol! Hopefully the computer in the dealership will detect the fault & we can work from there. I attempted to access the fuel sender area in the tank but was unable to due to the screw heads rounding off due to being very rusty & soft. I will probably grind the heads off tomorrow & check the inside of the tank, is this sender unit area where the guaze & filter are? If the flakes are in the inside of the tank is it a matter off cleaning it out & everything being ok?
 

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Hi Big, Cannot answer whether it was where fuel sender is, but at a guess I wouls say it was accessable there as my fuel was not drained from tank..I was told the fuel filter in there is very rarely changed even on full services at kis dealers. One Kia dealer did not know it existed.... so hope it is your problem, should be solved quite then. Hope this helps.
 

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Could be the crankshaft sensor failed causing it to go into limp mode - although would have thought this would show up on OBD II
 

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Discussion Starter #13
Hi all,
Just an update for you, took the car into the Kia dealership last night for connection to their diagnostics system. However, upon connecting the car it would NOT communicate with the computer via the OBD port under the steering column, the mechanic then tried connecting to the OBD under the bonnet but the same....

The mechanic seems to think that the vehicle is suffering from an electrical/ecu problem, he believes this is why the car can't communicate & isn't running correctly, he also believes there is an electrical issue as the ECU light only occassionally illuminates when turning the ignition on & off when it should light every time. Also, when the ignition is on & the dash lights are on some symbols are brighter than others, eg the battery light is quite dim & also the handbrake light is bright until you release the handbrake which it then goes quite dim (instead of off!). The handbrake light does go off when the vehicle moves (not sure if this light is linked to the park feature of the auto box).

Anyone have an idea of what the above issue could be?



Thanks
 

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Hi, I presume you have checked all wiring connections/plug ins, etc to the ECU could be a dirty/bad connection thats causing the intermitent warning lights to show! Secondly - a bit of a long shot but have you thought of contacting the previous owner - he may have had all this investigation carried out before he decided to get rid - for the cost of a phone call it could be worth it.
Sounds like the ECU if nothing coming back tovia the OBDII plug - hope you can get it sorted - Good Luck
 

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Just had another idea - is this model /year OBD II compliant any way - although I would have thought the Kia guy would have known this. Not sure how you find out if this is the case but other Forum members should be able to advise.
 

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i would check to see if any earth cables have come off near battery you could try putting a jumper lead cable from the negative - side of the battery to the chassis (do not put positive + to the chassis it will go bang )i have had problems with vehicles with bad earths doing allsorts of crazy stuff .it may help or do nothing at all but at least you will know its not down to a lack of earth- .ps if all lights go bright when you do this this maybe where the problem lies .hope this help .
 

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Also try a jump lead from negative on battery to a good point on the engine. I had starting and charging problems and poor running on my van and this was caused by an earth problem from body to engine. All was well after running a new earth from battery to engine.
Edited by: davy
 

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Hi, in reply, when I had this problem my OBD port under steering column showed no faults, that was from the AA man (UK) but my garage plugged in to the OBD port under the bonnet, a Kia mechanic should have known this I would have thought, it showed up 5 faults all connected to a fuel problem. Hope this helps again
 

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Discussion Starter #19
Hi all,
Carried out various jobs on the car yesterday as advised by Kia mechanics, they included removing & cleaning the earth strap next to the ABS unit, disconnecting the fuel line that exits the fuel filter & placing this hose into a bottle full of diesel to eliminate any possible fuel line/petrol tank issues. I also disconneted the multi plugs into the main ecu (under dash on passanger footwell) & inspected wiring loom for possible 'nicks' caused by the protective shield over the ecu.... All of the above did not appear to have any effect, I didn't really expect them to due to the car being in what appears to be a limp mode.

Today, I visited an auto electrician that had a scanner capible of reading Kia ecu's, he did not have any issues communicating with the the ecu & 4 fault codes were detected. The guy stated he did not know how old the faults were & suggested re-setting the faults. Within 30 seconds the faults were cleared & the car was re-started, perfect..............


Car revved quite happily well above 2700rpm, auto box changes gear faultlessly & smoothly. The electrician advised that I use the car & see if it goes back into limp mode, if this is the case he can then re-read the codes to see which if any of the faults have re-appeared. Drove the car approx 10 miles home & the car drove spot on, hopefully it will now stay that way. The main fault the mechanic believes may have caused the activation was a fault on the fuel circuit, he thinks this may have been caused by someone replacing a diesel filter & not bleeding the diesel through into the filter using the pump bulb & instead just turning the engine over & over kicking it into limp mode. Fingers crossed for no further faults!!



Anyone wanna buy a Kia Sedonna, its put me off them a bit lol!!
 

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Well done - good of you to find a garage with the skills to find the problem and sort it - I'll keep my fingers crossed for you.
I'm sure you'll enjoy it now its running ok

Cheers
 
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