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au ser 1 5ltr fluctuating and cough. 

 

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 Post subject: au ser 1 5ltr fluctuating and cough.
Posted: Mon Aug 08, 2011 8:57 pm 
Oompa Loompa
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Age: 39

Posts: 26

Joined: 17th Apr 2011

Ride: ef fairmont

Location: adelaide
SA, Australia

issue. engine hunts while holding a steady speed more noticeable in lower gears.
- the engine also has a complete miss or cough when accelerating hard but runs fine if driving sedately idles ok and revs out ok with no load.
repairs. 1 changed fuel filter. 2 cleaned out plennum and throttle body inc air flow meter air temp.
3 checked plugs (new) the gap was 1.00mm and changed to 1.30mm as per book.
4 checked fuel pressure 30psi at idle and with the vac line off the fuel reg it is 39-40psi.
I was told if the cam angle sensor is warn it could creat these symptoms the ute has done 274000kms.
help!!!
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 Post subject: Re: au ser 1 5ltr fluctuating and cough.
Posted: Sat Aug 13, 2011 12:15 am 
Getting Side Ways
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Age: 39

Posts: 1886

Joined: 26th Nov 2006

Gallery: 7 images

Ride: EL XR8, '08 Mondeo XR5t

Power: 205 rwkw

Location: Perth
WA, Australia

Coilpacks, maybe? If you know someone else with an AU that you can swap over to see if it makes a difference, it'd save you from going out and purchasing new parts to find they don't make a difference. Also check your leads aren't arcing out anywhere, cracked boots, etc.

 

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Trickflow Street Heat top end kit, 70mm BBK TB & EGR, 24lb injectors, Underdrives & 3.73s: 275rwhp - 13.15@105mph NA / 12.37@116mph N20

When injustice becomes law, resistance becomes duty

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 Post subject: Re: au ser 1 5ltr fluctuating and cough.
Posted: Sat Aug 13, 2011 11:35 pm 
Oompa Loompa
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Age: 39

Posts: 26

Joined: 17th Apr 2011

Ride: ef fairmont

Location: adelaide
SA, Australia

cheers i have a spare coil pack but only one will chuck it on. checked all leads and tested them all around 3-4 ohms. also disconnected battery for hour or so and tried after that the surging is still there but maybe a fraction less hard to tell.
It f@rt around a bit if you are a gear to high and accelorate a little harder than you should for that gear if you know what im on about.
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 Post subject: Re: au ser 1 5ltr fluctuating and cough.
Posted: Mon Aug 15, 2011 11:49 pm 
Getting Side Ways
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Age: 39

Posts: 1886

Joined: 26th Nov 2006

Gallery: 7 images

Ride: EL XR8, '08 Mondeo XR5t

Power: 205 rwkw

Location: Perth
WA, Australia

It sounds like it could be MAF-related. You said you cleaned it? Did you remove the electrics and spray them with contact cleaner? Neither of the hotwires are damaged? It's definitely plugged in properly?

 

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Trickflow Street Heat top end kit, 70mm BBK TB & EGR, 24lb injectors, Underdrives & 3.73s: 275rwhp - 13.15@105mph NA / 12.37@116mph N20

When injustice becomes law, resistance becomes duty

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 Post subject: Re: au ser 1 5ltr fluctuating and cough.
Posted: Tue Aug 16, 2011 10:12 pm 
Oompa Loompa
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Age: 39

Posts: 26

Joined: 17th Apr 2011

Ride: ef fairmont

Location: adelaide
SA, Australia

I did clean it and the wires are intact the plug is clean (now) and all pins tight.
I have a mate with a scan tool so might see what codes we get once i get over there.
cheers.
anoghter guy said that poor earthing for the oxy sensors (?hego) can cause the surging.
dunno.
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 Post subject: Re: au ser 1 5ltr fluctuating and cough.
Posted: Wed Aug 17, 2011 1:41 am 
Getting Side Ways
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User avatar

Age: 39

Posts: 1886

Joined: 26th Nov 2006

Gallery: 7 images

Ride: EL XR8, '08 Mondeo XR5t

Power: 205 rwkw

Location: Perth
WA, Australia

Scanning for codes is the best thing you can do. Hopefully something shows up and you get it sorted.

 

_________________

Trickflow Street Heat top end kit, 70mm BBK TB & EGR, 24lb injectors, Underdrives & 3.73s: 275rwhp - 13.15@105mph NA / 12.37@116mph N20

When injustice becomes law, resistance becomes duty

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 Post subject: Re: au ser 1 5ltr fluctuating and cough.
Posted: Wed Aug 17, 2011 1:53 pm 
Oompa Loompa
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Age: 35

Posts: 47

Joined: 12th Aug 2011

Ride: FG XR6 Turbo Ute

Location: Deer Park
VIC, Australia

oil condition?

i know when i had my ef xr, when was getting close to service schedule it used to display similar symptons. Due to some fuel particles in oil.
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 Post subject: Re: au ser 1 5ltr fluctuating and cough.
Posted: Wed Aug 17, 2011 3:33 pm 
Oompa Loompa
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Age: 39

Posts: 26

Joined: 17th Apr 2011

Ride: ef fairmont

Location: adelaide
SA, Australia

Its about 35kms overdue on the oil change bout to do it.
I disconnected the oxy sensors and took it for a drive and the ute stopped surging straight away thinking this may be the cause does any one know the specs on the sensors so i can run my multi meter over them first to be sure to be sure.
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 Post subject: Re: au ser 1 5ltr fluctuating and cough.
Posted: Thu Aug 25, 2011 6:47 pm 
Parts Gopher
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Joined: 28th Aug 2006

Location: Hillside
VIC, Australia

Check your harmonic , had the same problems and a slight vibration was missing changed everything only to find out the harmonic was routed
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 Post subject: Re: au ser 1 5ltr fluctuating and cough.
Posted: Fri Aug 26, 2011 9:20 pm 
Oompa Loompa
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Age: 39

Posts: 26

Joined: 17th Apr 2011

Ride: ef fairmont

Location: adelaide
SA, Australia

will do it seems to run nice and streight and cannot see any rubber hanging out any where.
cheers.
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 Post subject: Re: au ser 1 5ltr fluctuating and cough.
Posted: Sat Aug 27, 2011 3:28 pm 
Parts Gopher
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Posts: 97

Joined: 28th Aug 2006

Location: Hillside
VIC, Australia

Does it run rough once its up to operating temp ???
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 Post subject: Re: au ser 1 5ltr fluctuating and cough.
Posted: Sun Aug 28, 2011 8:34 pm 
Oompa Loompa
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Age: 39

Posts: 26

Joined: 17th Apr 2011

Ride: ef fairmont

Location: adelaide
SA, Australia

not realy it runs fairly smooth at idol when hot seems the same hot or cold but to be honest im not all that farmiliar with stock engines and this is my first injected v8 should i be able to sit a beer on the engine without it falling off or what the idol revs are constant bout 850 rpm ish.
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 Post subject: Re: au ser 1 5ltr fluctuating and cough.
Posted: Fri Oct 14, 2011 7:08 pm 
Oompa Loompa
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Age: 39

Posts: 26

Joined: 17th Apr 2011

Ride: ef fairmont

Location: adelaide
SA, Australia

still having troble with this ute have now replaced the fuel pump and my fuel pressures are still around 29psi idol and vac dissconnected 35psi ish still hunts at steady throttle unless you un hook o2 sensors. and have still been having those misfires at higher revs notice it more when you give it and change gear and give it again. at one stage while overtaking a truck it lost heaps of power and was running rough then when i slowed for a town and came out the other side had all its power back. have also replaced the coil packs and no different. what the. is it possible the fuel reg has s**t itself a bit?
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