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Miss/Bacfire What else can it be 


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 Post subject: Miss/Bacfire What else can it be
Posted: Wed Aug 13, 2008 11:29 am 
Oompa Loompa

Age: 36

Posts: 20

Joined: 10th Feb 2005

Location: Melbourne
VIC, Australia

I have a EF XR6 6 cylder which has a miss/backfire from idle only and it doesn't happen all the time, If I take off with over 1500 RPM, It is ok, just hesitates a little. . If I am gentle with it, it misses and sometimes backfires.
So far have replaced, leads, plugs, coil, fuel pump,filter, & injectors. TPS and IAC. The car has no fault codes.
Any ideas what else could cause this?
Posted: Wed Aug 13, 2008 12:11 pm 
Stock as a Rock

Age: 55

Posts: 153

Joined: 6th Dec 2004

Ride: ef gli

Location: Brisbane
QLD, Australia

Possibly a vacuum leak somewhere around intake manifold.




Those who say "it can't be done" shouldn't interrupt those who are doing it.

Posted: Wed Aug 13, 2008 1:37 pm 
Getting Side Ways
User avatar

Posts: 887

Joined: 8th Aug 2006

Ride: Falcon

Location: Central Highlands
QLD, Australia

Try tightening exhaust and inlet manifold bolts first(unmetered air causing bad/poor idle). Put a multimeter on the 02 senor and makesure it's swicthing between 0.8v-0.1v. If it's favouring 0.1v-0.4v(lean) or 0.5V-0.8V(rich). If the bolts are tight I would be looking at the ECU,

Take the ECU apart and check the the earth rail continuity and the 2 lugs that earth to PCB to ECU casing. Also check the capacitors haven't popped.

Do a search- EF ECU's are common for the idle drive cct to fail.



97 EL Fairmont 4l OHC .Silver.
Exhaust: Pacemaker's, 2.5" exhaust and Hiflow cat
Intake: FRAM AIRHOG , EL GT snorkel
XR6 300kpa fuel reg Stg 2 Auto Shift Kit.6DJA ECU
PM in Qld looking too buy Toyota 4*4 SR5 Dualcab Hilux 91-97 with 2.8l diesel engine/5spd manual

Posted: Wed Aug 20, 2008 12:07 am 
Parts Gopher

Posts: 63

Joined: 9th Aug 2008

Ride: toyo,2ea,3eb,1ef,1el,zh

Location: sextonville
QLD, Australia

check compression--sounds like head leak-when revs are up higher comp & faster rate of fireing can overcomes symptoms :mrgreen:
Posted: Wed Aug 20, 2008 2:54 pm 
Parts Gopher

Age: 31

Posts: 53

Joined: 8th May 2008

Ride: EL XR8

Location: Sydney
NSW, Australia

What EL_Fairmont said..
Posted: Wed Aug 20, 2008 10:52 pm 
Getting Side Ways
User avatar

Age: 40

Posts: 1780

Joined: 31st Jan 2005

Gallery: 10 images

Ride: 07 BF mk2 E-gas wagon + eb 5.0

Power: 174 rwkw

Location: Adelaide
SA, Australia

i chased an intermittant miss in my old ef xr6 wagon for a couple of years. long story short, what finally fixed it was the cam angle sensor. i had it in at a couple of ford places to check fault codes on a number of occasions over the period but always came up clean. i have a mate who is a auto electrician and has the equipment to check codes also and his picked up the cam angle sensor.

replaced with a second hand one and all was good.

not saying that your problem but something else to think about.



eb v8: low loud and fast. just how a v8 should be. i guess the big question is, is it fast enough...

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