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EF XR8 Choking and gutless under load 

 

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 Post subject: EF XR8 Choking and gutless under load
Posted: Sun Dec 20, 2009 8:17 pm 
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Sons EF 5.0 auto if you go lightly (under half on the gas pedal) it runs fantastic but give it a boot full or just put your foot down to get going in traffic quick and its like its choking to death it becomes gutless and feels like someone just blocked off the air filter. It then wont rev over 4000 and holds the gear and wont change up unless you back off a bit. It seem to be engine related so far I replaced the fuel filter for him (fuel came out as black as sump oil) and checked that the fuel pressure reg holds suction and its still doing it but occasionally comes good for a day or so. I also reset the ecu.
It doesn't seem to misfire just severely holds back , wondering if coil maybe playing up. I also ran the motor through some paces in the dark ( revved it and loaded it in gear with brake) to see if there was any cross firing and couldn't see any.

Now its up to you guys for ideas before it gets booked in to the robbers at the workshop.
Any ideas appreciated maybe someones had these issues
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 Post subject: Re: EF XR8 Choking and gutless under load
Posted: Sun Dec 20, 2009 8:38 pm 
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paulhowes wrote:
Sons EF 5.0 auto if you go lightly (under half on the gas pedal) it runs fantastic but give it a boot full or just put your foot down to get going in traffic quick and its like its choking to death it becomes gutless and feels like someone just blocked off the air filter. It then wont rev over 4000 and holds the gear and wont change up unless you back off a bit. It seem to be engine related so far I replaced the fuel filter for him (fuel came out as black as sump oil) and checked that the fuel pressure reg holds suction and its still doing it but occasionally comes good for a day or so. I also reset the ecu.
It doesn't seem to misfire just severely holds back , wondering if coil maybe playing up. I also ran the motor through some paces in the dark ( revved it and loaded it in gear with brake) to see if there was any cross firing and couldn't see any.

Now its up to you guys for ideas before it gets booked in to the robbers at the workshop.
Any ideas appreciated maybe someones had these issues


Stock or modified? What work has it got done, and what size exhaust is on it?

 

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 Post subject: Re: EF XR8 Choking and gutless under load
Posted: Sun Dec 20, 2009 8:47 pm 
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[/quote]

Stock or modified? What work has it got done, and what size exhaust is on it?[/quote]


Stock as a rock with S/S 2.5 inch straight through exhaust.Nothing changed any time recent except those I listed. leads cap and plugs (iridium) around 12 mnths old and air filter is K&N washable
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 Post subject: Re: EF XR8 Choking and gutless under load
Posted: Sun Dec 20, 2009 10:35 pm 
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Cats, fuel filter
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 Post subject: Re: EF XR8 Choking and gutless under load
Posted: Sun Dec 20, 2009 11:04 pm 
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paulhowes wrote:


Stock or modified? What work has it got done, and what size exhaust is on it?[/quote]


Stock as a rock with S/S 2.5 inch straight through exhaust.Nothing changed any time recent except those I listed. leads cap and plugs (iridium) around 12 mnths old and air filter is K&N washable[/quote]

the exhaust shouldn't be choking a stock 5L. Change the fuel filter and check the cats. I just downsized the exhaust on my AU from a single 3" to a single 2.5 (cost and the 3" was stuffed) and it chokes the 185kw AU at around 4900rpm.

 

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ILL60 - EF XR8, Sunroof, Ticky Kit, 19x8.5/19x11 TE37's, 347, AFr185's, TFS BoxRcustom converter, Hurst Quarterstick, huge billet cam.

51TER - DL LTD. Stock.

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 Post subject: Re: EF XR8 Choking and gutless under load
Posted: Sun Dec 20, 2009 11:24 pm 
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Check Cats, MAF, TPS, 02 sensors, Fuel reg & vacuum hose to it...
Check thermostat, maybe in cold start ??
Then check ignition system, plugs, leads coil[s] etc...
Check battery connections, earth from body to motor..
Check for air leaks between maf and engine...

 

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 Post subject: Re: EF XR8 Choking and gutless under load
Posted: Mon Dec 21, 2009 12:10 pm 
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 Post subject: Re: EF XR8 Choking and gutless under load
Posted: Mon Dec 21, 2009 3:52 pm 
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dizzy? dizzy cog. engine to dizzy cog
my cog had a bit ground off of it and it did the exact same thing, except for being manual

 

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 Post subject: Re: EF XR8 Choking and gutless under load
Posted: Mon Dec 21, 2009 4:47 pm 
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I had the same problem with my 5.0L El Fairmont. It ended being the exhaust was stuffed. Replaced it with a 2.5" and runs alot better.
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 Post subject: Re: EF XR8 Choking and gutless under load
Posted: Tue Dec 22, 2009 6:29 am 
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I see your runing a K&N filter ???
Don't over oil them ...
Check MAF / air metter for contamination of oil from filter ??
The hot wire inside tends to get full of crud and NOT work correctly...
DON'T touch the wire. Just wash with white spirits etc...

 

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As in ZOOM 126 edition
331 Dart block,3.25/ 4340 steel crank, Oliver rods,TFS ported track heat heads, TFS track heat inlet Twin SC61 turbo's
Project 1UZ-EF has started.. S475 Turbo 4.0 V8 Mustang Celica.....

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 Post subject: Re: EF XR8 Choking and gutless under load
Posted: Tue Dec 22, 2009 11:16 pm 
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EBXR8380 wrote:
I see your runing a K&N filter ???
Don't over oil them ...
Check MAF / air metter for contamination of oil from filter ??
The hot wire inside tends to get full of crud and NOT work correctly...
DON'T touch the wire. Just wash with white spirits etc...



Bingo. We were having the exact same problem with our EL XR8. Narrowed the problem down the the MAF after throwing the one from the NF in and the problem went away. Put the XR8 Maf in the NF and the same problem transferred to the NF. Cleaned it up with electronic contact cleaner. Seems to be as good as new now. They were putrid.

 

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 Post subject: Re: EF XR8 Choking and gutless under load
Posted: Wed Dec 23, 2009 12:52 am 
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Sorry 4 the late reply fellas I've had computer issues as well.
Thanks I will be checking the MAF as soon as I find my security bits to undo the sucker and also the other items mentioned.
Thanx again 4 all the replies
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 Post subject: Re: EF XR8 Choking and gutless under load
Posted: Wed Dec 30, 2009 1:42 pm 
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paulhowes wrote:
Sorry 4 the late reply fellas I've had computer issues as well.
Thanks I will be checking the MAF as soon as I find my security bits to undo the sucker and also the other items mentioned.
Thanx again 4 all the replies


Don't really need to remove the torx screws. Just get a can of electrical contact cleaner, remove the airbox and spray it - you can access it this way well enough. If it's not the MAF I would think it would have to be blocked cats.

67RCE wrote:
the exhaust shouldn't be choking a stock 5L. Change the fuel filter and check the cats. I just downsized the exhaust on my AU from a single 3" to a single 2.5 (cost and the 3" was stuffed) and it chokes the 185kw AU at around 4900rpm.


Don't mean to move off topic, but apart from being slightly restrictive up top how does the 2.5" perform compared to the 3". Better low end? Less Drone? Exhaust tone difference? Do you prefur the 3" or 2.5"?

 

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 Post subject: Re: EF XR8 Choking and gutless under load
Posted: Wed Dec 30, 2009 8:24 pm 
Getting Side Ways
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Age: 29

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Ride: 1993 EB XR8

Location: BrisVegas
QLD, Australia

sd1800 wrote:
paulhowes wrote:
Sorry 4 the late reply fellas I've had computer issues as well.
Thanks I will be checking the MAF as soon as I find my security bits to undo the sucker and also the other items mentioned.
Thanx again 4 all the replies


Don't really need to remove the torx screws. Just get a can of electrical contact cleaner, remove the airbox and spray it - you can access it this way well enough. If it's not the MAF I would think it would have to be blocked cats.

67RCE wrote:
the exhaust shouldn't be choking a stock 5L. Change the fuel filter and check the cats. I just downsized the exhaust on my AU from a single 3" to a single 2.5 (cost and the 3" was stuffed) and it chokes the 185kw AU at around 4900rpm.


Don't mean to move off topic, but apart from being slightly restrictive up top how does the 2.5" perform compared to the 3". Better low end? Less Drone? Exhaust tone difference? Do you prefur the 3" or 2.5"?


More down low torque, can't comment on the drone as the 3" had one muffler, the 2.5 has a muffler and resonater. I'd like to get a 2.75" for a mix

 

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ILL60 - EF XR8, Sunroof, Ticky Kit, 19x8.5/19x11 TE37's, 347, AFr185's, TFS BoxRcustom converter, Hurst Quarterstick, huge billet cam.

51TER - DL LTD. Stock.

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 Post subject: Re: EF XR8 Choking and gutless under load
Posted: Thu Dec 31, 2009 2:39 pm 
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i had the same kinda problem with my el xr8...

but mine was only at idle it would struggle to start then when started the idle would be jumping around like crazy... so i took airbox off cleaned the maf sensor and seemed to have stabilazed the idle for now...

 

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