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Author Topic: Rough running, fuel trims all over the place  (Read 3252 times)

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omegod

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Re: Rough running, fuel trims all over the place
« Reply #15 on: 03 March 2014, 20:02:36 »

What model ?
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chrisgixer

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Re: Rough running, fuel trims all over the place
« Reply #16 on: 03 March 2014, 20:03:43 »

Er, have I missed what car?
Hyundai, but not sure that makes a difference ;D

if it has 4 wheels , sucks air and fuel and pumps out burned exhaust gas.. it doesnt really!

Ooh no. Can't post up without car/engine details. Ooh no. ::)
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cem_devecioglu

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Re: Rough running, fuel trims all over the place
« Reply #17 on: 03 March 2014, 21:14:11 »

Er, have I missed what car?
Hyundai, but not sure that makes a difference ;D

if it has 4 wheels , sucks air and fuel and pumps out burned exhaust gas.. it doesnt really!

Ooh no. Can't post up without car/engine details. Ooh no. ::)

it says rough running fuel trims all over the place.. so no proper combustion.. not a rocket science really  ;D
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TheBoy

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Re: Rough running, fuel trims all over the place
« Reply #18 on: 03 March 2014, 21:30:48 »

If it helps, its a Hyundai Santa Fe 2.4 (I think)
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chrisgixer

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Re: Rough running, fuel trims all over the place
« Reply #19 on: 03 March 2014, 21:32:21 »

If it helps, its a Hyundai Santa Fe 2.4 (I think)

Ah, so TB is evasive because TB doesn't know. ;D
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TheBoy

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Re: Rough running, fuel trims all over the place
« Reply #20 on: 03 March 2014, 21:34:54 »

If it helps, its a Hyundai Santa Fe 2.4 (I think)

Ah, so TB is evasive because TB doesn't know. ;D
I'm pretty certain. Well reasonably ::)

It was more as the car wasn't relevant, as virtually all petrol injection systems are identical in operation.
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chrisgixer

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Re: Rough running, fuel trims all over the place
« Reply #21 on: 03 March 2014, 21:36:44 »

If it helps, its a Hyundai Santa Fe 2.4 (I think)

Ah, so TB is evasive because TB doesn't know. ;D
I'm pretty certain. Well reasonably ::)

It was more as the car wasn't relevant, as virtually all petrol injection systems are identical in operation.

Yes, but if that was the case there wouldn't be a problem by the sound of it. Seems there's something specific to this model, what ever that may be. ;D
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05omegav6

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Re: Rough running, fuel trims all over the place
« Reply #22 on: 03 March 2014, 21:40:53 »

If it helps, its a Hyundai Santa Fe 2.4 (I think)
Mr Imber might be on the money :-X
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TheBoy

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Re: Rough running, fuel trims all over the place
« Reply #23 on: 03 March 2014, 21:41:22 »

If it helps, its a Hyundai Santa Fe 2.4 (I think)

Ah, so TB is evasive because TB doesn't know. ;D
I'm pretty certain. Well reasonably ::)

It was more as the car wasn't relevant, as virtually all petrol injection systems are identical in operation.

Yes, but if that was the case there wouldn't be a problem by the sound of it. Seems there's something specific to this model, what ever that may be. ;D
Eh?
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TheBoy

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Re: Rough running, fuel trims all over the place
« Reply #24 on: 03 March 2014, 21:42:14 »

If it helps, its a Hyundai Santa Fe 2.4 (I think)
Mr Imber might be on the money :-X
Whilst not my first choice of transport, its ideal for his needs...  ...or would be if it bloody worked ;D
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chrisgixer

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Re: Rough running, fuel trims all over the place
« Reply #25 on: 03 March 2014, 21:49:15 »

If it helps, its a Hyundai Santa Fe 2.4 (I think)

Ah, so TB is evasive because TB doesn't know. ;D
I'm pretty certain. Well reasonably ::)

It was more as the car wasn't relevant, as virtually all petrol injection systems are identical in operation.

Yes, but if that was the case there wouldn't be a problem by the sound of it. Seems there's something specific to this model, what ever that may be. ;D
Eh?

Ah the standard "I've been rumbled" response. ;D

If it was a standard run of the mill engine, the parameters you've checked would mean all was well on a normal engine. There for, it's not a "normal" engine. There for the model and engine details might help. Just saying. Like. ;)
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hoody

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Re: Rough running, fuel trims all over the place
« Reply #26 on: 03 March 2014, 23:49:54 »

« Last Edit: 03 March 2014, 23:55:47 by hoody »
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Kevin Wood

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Re: Rough running, fuel trims all over the place
« Reply #27 on: 04 March 2014, 08:11:19 »

I'd say check the fuel pressure if possible. Sometimes there's a schrader valve on the fuel rail.

Also, disconnect the return line from the rail and see how much fuel is flowing. Should be coming out at a decent rate at idle.

Is there a vacuum reference connection to the FPR? Might be worth checking if this is OK - not blocked or split.

The fuel filter issue is odd, though. :-\
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aaronjb

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Re: Rough running, fuel trims all over the place
« Reply #28 on: 04 March 2014, 09:01:33 »

On the fuel filter front.. it's not something daft like a filter with built in one-way valve and he's been fitting them backward, has he? Just a thought.

I'd start with the obvious, too - fuel pressure and the TPS since you know it's not reading right.  Is it possible to adjust the TPS on that car?

if the ECU thinks the car is really rich and needs to pull a ton of fuel, how old are the O2 sensor(s)?
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05omegav6

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Re: Rough running, fuel trims all over the place
« Reply #29 on: 04 March 2014, 10:56:52 »

Quote
if the ECU thinks the car is really rich and needs to pull a ton of fuel

Ecu coolant temp sensor failure could also do that... a freely flowing pattern filter might allow too much fuel through, flooding it, whereas the original one full of crap and with a finer filter might slow the flow just enough to prevent flooding yet not allow enough flow at higher rpm :-\
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