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Location:
Menai area of Sydney
Registered:
June 2003
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4AGE missing when throttle very slightly open.
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Fri, 12 August 2005 09:24
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Hi All,
Has anyone had the problem with a 4AGE where you are cruising along nicely with almost no throttle at all but as you just open up to accelerate, the engine seems to stutter then comes on really strong after the revs are up ? It's like it's getting too much air on slight throttle but open it further and it goes better.
I can't decide whether it is fuel or ignition and the fuel filter should be OK as it goes well at high revs.
I've adjusted the TPS pretty precisely to the manual specs.
I'm thinking it may be an injector issue (although they were cleaned less than 500kms ago)as it seems to lean off according to the O2 sensor and when I have the 8k resistor across the air temp sensor to richen the mixture, the problem seems less but it may be being masked by the engine performing a bit stronger.
It's not the hunting of the TPS that you get when it's out of adjustment - I can induce that and rectify it pretty easily.
No ECU error code which is why I'm thinking something at the end of the EFI chain like injector feed or spark. If it's spark that's missing I'd expect the mixture to richen up during the problem as there would be unburned fuel going through.
Apologies for the long winded info but it would be great if someone else has had a similar problem ... and fixed it.
Thanks.
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Location:
Wollongong
Registered:
January 2005
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Re: 4AGE missing when throttle very slightly open.
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Thu, 18 August 2005 00:18
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Has anyone got a solution to this problem? Because i'm having the exact same problem with my 4AGE and can't work it out.
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Location:
Adelaide
Registered:
January 2004
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Re: 4AGE missing when throttle very slightly open.
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Thu, 18 August 2005 03:13
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Have you guys removed the intake resonators?
There's an article in Zoom magizine that my mate was telling me about that proves that intake resonator can imporve midrange torque and Kw's
No idea if it helps, just a thought
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Toymods Social Secretary
Location:
Sydney
Registered:
July 2002
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Re: 4AGE missing when throttle very slightly open.
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Thu, 18 August 2005 03:20
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have you actually checked the TPS position with the correct feeler guages?
If not - DO IT.
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Location:
NSW
Registered:
September 2003
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Re: 4AGE missing when throttle very slightly open.
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Thu, 18 August 2005 07:54
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Similar prob for me turned out to be the AFM after it eventually progressed from what you are describing to engine barely running over idle... if you got AFM that is!
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Location:
Coffs Harbour, NSW
Registered:
November 2004
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Re: 4AGE missing when throttle very slightly open.
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Thu, 18 August 2005 09:33
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i have a similar (if not the same) problem atm
ive just had a new engine installed (previous one seized), and when you floor it suddenly, it kind of stutters/jerks. i havent been game enough to keep flooring it after that though.
anyway, i took it into the mechanic's the other day because the check engine light was coming on and i thought it was because of low level/pressure power steering fluid as it was leaking, but he found that the oxygen sensor had a frayed wire or something like that. im taking it in again tomorrow morning so he can put the oxy sensor from my old engine on there, so ill get back to you guys on whether it works or not
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Location:
sydney
Registered:
October 2004
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Re: 4AGE missing when throttle very slightly open.
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Thu, 18 August 2005 18:34
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yeh i have the same problem with my 20v
but it only does it every now and then
but specially at the lights when im idleing for too long
its use 2 do it heaps more before i fixed my AFM and changed the air filter
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Location:
Coffs Harbour, NSW
Registered:
November 2004
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Re: 4AGE missing when throttle very slightly open.
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Fri, 19 August 2005 08:13
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| skellator wrote on Thu, 18 August 2005 19:33 |
im taking it in again tomorrow morning so he can put the oxy sensor from my old engine on there, so ill get back to you guys on whether it works or not
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it worked  all good now
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Location:
Menai area of Sydney
Registered:
June 2003
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Re: 4AGE missing when throttle very slightly open.
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Fri, 19 August 2005 08:33
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Hmmm, thanks for the info.
I have tried removing the air filter without luck but have a spare MAP sensor so I might try swapping that over. Cheers.
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Location:
Wollongong
Registered:
January 2005
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Location:
Menai area of Sydney
Registered:
June 2003
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Re: 4AGE missing when throttle very slightly open.
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Sun, 04 September 2005 11:04
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I made up an adaptor to plug into the TPS and check it out for voltages and resistance. While I have the feeler gauge settings set up properly, it looks like the guts of it may be stuffed. As you open the throttle, the resistance between VTA and E2 should increase while the resistance between VTA and Vcc should decrease. ( E2 to Vcc is a resistor with VTA sweeping from one end of it to the other ) Mine likes to go open circuit. I may be able to try a spare 1G TPS tomorrow night. Will advise if this fixes it.
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