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Power dip when cold...
Posted: Tue Feb 13, 2007 11:02 am
by Li7hium
Hey guys,
I've started noticing more and more a significant power dip when I am accelerating on a cold or cool start. Idle is fine and moving around at slow speed is fine, but as soon as I start pushing about 50% throttle or so, it feels like someone has just turned the air con on, with the power dip and it takes a few seconds, and backing off the throttle, to get it to come back on full power.
And NO, the a/c is NOT on at the time.
Any ideas?
Matt
Posted: Tue Feb 13, 2007 11:22 am
by 16bit
i have the same thing but it has always been like that. when it warms up its fine (about a minute of normal driving). Maybe the ecu is retarding the timing until it gets to a certain temp for some reason.
Posted: Tue Feb 13, 2007 11:55 am
by StanTheMan
I'd be looking at the O2 sensor.
Posted: Tue Feb 13, 2007 1:25 pm
by Boags
Sounds like leads to me... How old are they?
Boags
Posted: Tue Feb 13, 2007 1:27 pm
by Li7hium
Leads are about 90K kms old, as it turns out.
And before anyone asks, yes the petrol tank is full!
Matt
Re:
Posted: Tue Feb 13, 2007 1:37 pm
by Boags
Li7hium wrote:And before anyone asks, yes the petrol tank is full!
Yep, that would have been my next question...
Posted: Tue Feb 13, 2007 8:09 pm
by sabretooth
I'm inclined to think it's the AFM or the TPS. The O2 sensor is not used under acceleration...
Posted: Tue Feb 13, 2007 8:10 pm
by Li7hium
OK, lets dumb it down for the less mechanically minded, moi included.
AFM?
TPS?
Thanks,
Matt
Re:
Posted: Tue Feb 13, 2007 8:12 pm
by Boags
Li7hium wrote:OK, lets dumb it down for the less mechanically minded, moi included.
AFM?
TPS?
Thanks,
Matt
AFM = Air Flow Meter
TPS = Throttle Position Sensor
I'd still bet your left nut it's leads. Not mine though.
Boags
Posted: Tue Feb 13, 2007 8:35 pm
by sabretooth
Boags has a good point - as leads deteriorate they won't be able to ignite the spark in denser or higher-pressure mixtures.
Do that first.
And a shaken-fist to you lot snubbing us IRC-ers!
Re:
Posted: Tue Feb 13, 2007 8:47 pm
by Craig
Li7hium wrote:Leads are about 90K kms old, as it turns out
Not a bad effort from a set of Magnacors though!
Posted: Tue Feb 13, 2007 8:56 pm
by JBT
....power dip when I am accelerating on a cold or cool start....
That's the symptoms mine had when the leads started to fail.
Posted: Wed Feb 14, 2007 10:12 am
by Li7hium
Difficult job to replace the leads?
I'm thinking of ordering a replacement set of the Magnacors Blue from Mania and doing it myself.
Matt
Posted: Wed Feb 14, 2007 10:13 am
by Garry
Easy job. Just replace them one at a time so that you dont get them mixed up.
Posted: Wed Feb 14, 2007 10:14 am
by Li7hium
And are the NGK Iridium IX Spark Plugs still the bees knees? Since I am doing leads, for sake of completeness I should probably do plugs as well.
Matt