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ef xr6 stutter?? 

 

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 Post subject: ef xr6 stutter??
Posted: Tue Aug 23, 2005 3:05 pm 
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Hello all,
Im the proud owner of an ef xr6, 5 speed. However i have a problem with the motor. When i floor it and open on full throttle, after 3000 revs its it stutters and seems to missfire all the way to redline. Though when i hold it at 3/4 throttle, the thing seems fine and does not stutter at all.
I have replaced the sensor on the thottle body, that connects to the butterfly, and put in new leads, plugs and coil, to no avail.
Any ideas?
(at no time does it stutter under 3000)
thankyou.
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 Post subject: hmmm...
Posted: Wed Aug 24, 2005 1:45 am 
Tyre Shredder
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Try the oxygen centre on the exhaust. Take it out n clean it with wd-40 then throw it back in, see wat happens

 

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Posted: Wed Aug 24, 2005 11:04 am 
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Thankyou for relplying, it wont hurt to try
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Posted: Wed Aug 24, 2005 11:27 am 
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try taking the throttle body off and cleaning it. i found this was the problem with my car guzzling fuel and only had it done 3 days ago. it could be all clogged up with shizt.

the butterfly may not be able to go full throttle as it might be blocked, and if it has never be cleaned this maybe one thing to look at

have fun hope this helps

 

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Posted: Wed Aug 24, 2005 11:47 am 
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Sounds like you have checked all likely spark issues.

Sounds like you need to check fuel pressure at the injectors. Low fuel pressure can cause this to happen as the engine is starving for fuel when under a heavy fuel load!

 

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Posted: Wed Aug 24, 2005 11:55 am 
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Yeah, it certainly sounds like a fuel feed issue. You may have dirty injectors, but they should show up at lower RPM - is your idle a bit rough ?? Simple thing you can do is pull and blank off the vaccy line off the fuel reg (this increases the fuel rail pressure) - if your idle improves it will mean the injectors are possibly dirty. Go for a drive with this setup, and see if the starvation is still there, if not, it looks like the reg is not delivering enough pressure. Put the vaccy line back on. If the issue remains, your fuel pump may not be delivering enough supply - you can check by putting a pressure gauge inline upstream of the fuel reg to check.

 

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Posted: Wed Aug 24, 2005 12:00 pm 
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You could change your fuel filter, won't hurt and its cheap.

Ben
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Posted: Wed Aug 24, 2005 5:48 pm 
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wow, thankyou, guys!
yea my car idles fine and runs ok at under 3000 revs.
the car does not seem to use more fuel though
But ill have a look at what you guys said and get back to you, it wont hurt.
oh, and yea i did put a new fuel filter on, to no avail. very frustrating!
Once again, thanks guys!
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Posted: Wed Aug 24, 2005 9:06 pm 
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Bad news guys!
I cleaned the throttle body and the oxygen sensor, no difference!
I blocked of the vacum line to the fuel regulator, and yet again no difference.
i might buy another new fuel filter and check the fuel pressure and pump then see what happens.
Thankyou all for your replies.
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Posted: Thu Aug 25, 2005 12:42 am 
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So u put in new leas n spark plugs right? Just keep us updated on how u go :)

 

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Blast from the past.....
1973 HQ 253 Premier sedan, 1991 EA 3.9lt 30 anniversary sedan
1978 XC 250 Falcon 500 sedan, 1988 EA 3.9lt Fairmont sedan
1994 EF 4lt Gli Wagon 1995 EF 4lt XR6 sedan (now gas~!)
1996 Ef Gli sedan, 1988 GPX 250r, 1999 ZX9R Ninja

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Posted: Sat Sep 03, 2005 3:39 pm 
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Still no luck guys!
I put a another fuel filter in and still no good.
I see a few others of different threads have a similar problem.
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Posted: Sat Sep 03, 2005 5:14 pm 
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I had a similar problem but just missed a bit after 3 grand. Changed a lot of things but fixed it when I took out the air cleaner element, obviously too dirty. Have you checked the diagnostic plug to make sure there are no alarms up?

 

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Posted: Mon Dec 19, 2005 3:49 am 
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hey i no this is a old thread, but im getting the exact same problem, its only after 3 grand too and its a misfire all the way till it redlines, ive tried

Friends TPS
Different ECU
New Leads/Sparks
New Fuel Pressure Regulator
Timing Done
New Fuel Pump
New Injectors
Different Fuels

Everythign pretty much,

shj70, wot do u mean u fixed it wen u took out the air cleaner element? wots that??

Thanks!!
- Grechie

 

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Posted: Mon Dec 19, 2005 8:44 am 
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He is talking about the air filter. It was too dirty to flow enough air.

 

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Posted: Mon Dec 19, 2005 7:11 pm 
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oh ok, tried that didnt fix it,m ill never get it fixed :(

 

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