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Author Topic: cold start issue and fuel trim error  (Read 382 times)

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Nick W

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Re: cold start issue and fuel trim error
« Reply #15 on: 07 January 2019, 22:04:33 »

Hope you figure this out. Because i have a 95 3,0 that behaves pretty much exactly the same can crank from 5-10 secs before firing after sitting for a while. If it just been sitting a few minutes it fires up instantly. Also have the stumbling for a few seconds after firing.


A fuel pressure test is easy enough. And for those with an aversion to proper diagnosis, a new fuel pump is cheap.


I doubt it's a leaky injector as they tend to leak constantly, which immediately affects the fuel economy.
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terry paget

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Re: cold start issue and fuel trim error
« Reply #16 on: 07 January 2019, 22:56:48 »

Hope you figure this out. Because i have a 95 3,0 that behaves pretty much exactly the same can crank from 5-10 secs before firing after sitting for a while. If it just been sitting a few minutes it fires up instantly. Also have the stumbling for a few seconds after firing.
My 2.5 manual behaved similarly, I thought it might be failing fuel pump, though once started it ran perfectly. I went to change the pump, but when I got the pump out of the fuel tank I could see the fault straight away - the hoses were attached to the pump, not with spring clips but with jubilee clips, which had become a bit slack as the hose compressed. I replaced the jubilee clips with spring clips and fault disappeared. That was three years ago, fault has not recurred.
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Re: cold start issue and fuel trim error
« Reply #17 on: 08 January 2019, 20:24:49 »

Another simple test if you have access to the live data... Does the ecu coolant temp broadly match the gauge?
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dunc52

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Re: cold start issue and fuel trim error
« Reply #18 on: 08 January 2019, 20:31:21 »

I would be initially expecting leaky injectors.

Next time, fully floor (I mean fully floor) then crank.  It shouldn't start, but should clear fuel from cylinder. Then start normally.

Hi to 'The Boy'....tried your advice this morning as you exactly said.  Result was a first time crank over and an immediate start up, (not a long crank over as is the case each morning either, just a normal and healthy cold morning start), an immediate fire up plus, plus, plus no lumpiness or spluter or difficulty whatsoever.  Why did it catch on the 1st attempt and not the 2nd turn over??  It was a good feeling but short lived as i pondered what is happening.  Is it a tired pump or a very slow leaky injector, that takes 12hrs or more to present itself as a poor start in a following morning.  Well ive got a bosch pump ordered....take it from there and thanks again for your guidance and advice  :y 
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Re: cold start issue and fuel trim error
« Reply #19 on: 08 January 2019, 20:36:34 »

 to the doc,  yes...broadly speaking  :y 
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Doctor Gollum

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Re: cold start issue and fuel trim error
« Reply #20 on: 08 January 2019, 20:37:28 »

Rules out that then :y
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terry paget

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Re: cold start issue and fuel trim error
« Reply #21 on: 09 January 2019, 11:13:44 »

I would be initially expecting leaky injectors.

Next time, fully floor (I mean fully floor) then crank.  It shouldn't start, but should clear fuel from cylinder. Then start normally.

Hi to 'The Boy'....tried your advice this morning as you exactly said.  Result was a first time crank over and an immediate start up, (not a long crank over as is the case each morning either, just a normal and healthy cold morning start), an immediate fire up plus, plus, plus no lumpiness or spluter or difficulty whatsoever.  Why did it catch on the 1st attempt and not the 2nd turn over??  It was a good feeling but short lived as i pondered what is happening.  Is it a tired pump or a very slow leaky injector, that takes 12hrs or more to present itself as a poor start in a following morning.  Well ive got a bosch pump ordered....take it from there and thanks again for your guidance and advice  :y
That would fit my leaky hose connection too. The fuel line at the engine end should retain pressure for days, easily checked by loosening the pressure relief valve or a hose connection.
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Nick W

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Re: cold start issue and fuel trim error
« Reply #22 on: 09 January 2019, 17:20:21 »

That would fit my leaky hose connection too. The fuel line at the engine end should retain pressure for days, easily checked by loosening the pressure relief valve or a hose connection.


Even easier to use the test valve on  the fuel rail......
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