John G
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Registered: 18th Jul 05
Location: Wirral, Merseyside
User status: Offline
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what would make a redtop to develop a flat spot after 4k? its on an astra gte, been told to look at fuel pump an fuel lines
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chris_gilly
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Registered: 13th Nov 08
Location: Birkenhead, Merseyside
User status: Offline
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have you got a cone filter(k&N etc) fitted??
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John G
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Registered: 18th Jul 05
Location: Wirral, Merseyside
User status: Offline
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its has yes
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chris_gilly
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Registered: 13th Nov 08
Location: Birkenhead, Merseyside
User status: Offline
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try changing back to the standard airbox this may help as the cone filter usually sucks in hot air from the bay causing flat spots or try heat sheilding the filter!
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John G
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Registered: 18th Jul 05
Location: Wirral, Merseyside
User status: Offline
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Anything else? its been rollin roaded at dyno demon and hes more so been told its gettin massive underfueling at 4k-4.8k
Fuel ratio was 14.5, then it dips to 11, so its overfueling then underfueling which is leadin us to the fuel lines and pump.
but with it bein on the tech 1 ecu we can find anyone round here that has tech 1 machinary, even vauxcare only have tech 2's
[Edited on 16-12-2008 by John G]
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chris_gilly
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Registered: 13th Nov 08
Location: Birkenhead, Merseyside
User status: Offline
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probably worth putting the standard airbox back on and drilling it with a k&n element. best trying this first before spending money! then if not check all fuel lines and see if the pumps working as it should.
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John G
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Registered: 18th Jul 05
Location: Wirral, Merseyside
User status: Offline
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quote:
Originally posted by chris_gilly
probably worth putting the standard airbox back on and drilling it with a k&n element. best trying this first before spending money! then if not check all fuel lines and see if the pumps working as it should.
You can see on the rr graph its not down to air intake, even the dd guys agreed
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chris_gilly
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Registered: 13th Nov 08
Location: Birkenhead, Merseyside
User status: Offline
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well the underfuelling doesnt sound good! does it run rough whilst idling?? or is it just between that RPM range??
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John G
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Registered: 18th Jul 05
Location: Wirral, Merseyside
User status: Offline
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just between that rpm, mainly on mway, runns fine on tick over and fine thro the gears
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chris_gilly
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Registered: 13th Nov 08
Location: Birkenhead, Merseyside
User status: Offline
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wow its really hard to say! has it always done this or is it jut starting? if its just starting it could be a sensor mass air flow or EGR on its way out??!! can you do the paper clip test on this? maybe worth a try to see if its throwing up any fault codes!
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