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        General >> Problems >> Power loss but only for a few seconds
        
(Message started by: Baz on Nov 16^th, 2004, 7:51pm)

Title: Power loss but only for a few seconds
Post by Baz on Nov 16^th, 2004, 7:51pm

Hello, today while driving home, my cossie lost most of its power while I was trying to accelerate. While the pedal was pressed hard down, the car just didn't rev or really want to move. It felt like there was some slight missing and as though something was holding it back. released the throttle, and everything was fine. It did the same again later tonight.

car is S reg 24v with 60k on the clock. Any ideas?

Baz

Title: Re: Power loss but only for a few seconds
Post by SaveTheNight on Nov 16^th, 2004, 8:56pm

Hi Baz .. fuel filter ? ..or pump perhaps ? .. STN

Title: Re: Power loss but only for a few seconds
Post by Baz on Nov 16^th, 2004, 9:42pm

Could be, but it seems to be incredibly inconsistant. It first happened weeks ago when I was going to Birmingham, just let the throttle off and it was OK. Since then have travelled to EuroDisney with no issues and probably driven 2500 miles since the last glitch and now 2 in a day. I will get my friendly mechanic to have a look, but where is the fuel filter on these?

Thanks

Barry

Title: Re: Power loss but only for a few seconds
Post by wumpster on Nov 16^th, 2004, 9:51pm

i had a problem like that on my last merc it turned out to be the throtle position sensor if that helps any

Title: Re: Power loss but only for a few seconds
Post by TonyS on Nov 16^th, 2004, 10:14pm

Possible it's the traction control system .. check your tyre pressures. Over 30mph the TCS switches to using selective fueling cutout to reduce engine power.

Title: Re: Power loss but only for a few seconds
Post by SaveTheNight on Nov 16^th, 2004, 10:15pm

sorry Baz ..I thought you meant just tonight ... if its electrical and under the circumstances that you describe ..ie: still holding the throttle down even when power has gone ..then you would almost certainly get a backfire on resume ..the fact that you dont would suggest fuel interuption ..try the relay maybe ..the large green one in the battery side box ..on older scorps it would be an immobiliser fault but yours isn't really like that .. hmmm .. loose crank sensor wires < common > .. faulty fuel pump knock sensor in boot ? ..what have you messed with lately ? will that give us a clue ?? servicing stuff ? .. STN

Title: Re: Power loss but only for a few seconds
Post by Baz on Nov 16^th, 2004, 10:23pm

Haven't really done anything to the car apart from Sat Nav and multi screen dvd/tv system and these are all plug and play stuff. Certainly haven't been under the bonnet. I will check a few of the suggestions out but it just baffles me as to why it is so intermittant!!

Baz

Title: Re: Power loss but only for a few seconds
Post by Eric_R on Nov 16^th, 2004, 11:48pm

Baz,
Have you checked for any OBD codes? A bad/intermittent signal from the CKP can momentarily cause LOS and when restored the engine will resume.
Have the DTCs checked.

Another candidate would be a catalyst element shifting in the exhaust. This momentarily causes the exhaust flow on one bank to be restricted. You might also notice a wheezing/whistling sound. Have you heard a catalyst rattle or a slight wheezing? A blocked catalyst may force off an EGR pipe so you might find an EGR DTC recorded - but this doesn't always happen. I notice you have stainless exhaust system. If the fitters had to hammer the exhaust system at all it may have broken a cat.

HTH

Title: Re: Power loss but only for a few seconds
Post by Baz on Nov 16^th, 2004, 11:52pm

Eric, haven't checked for codes yet but that is my job for tomorrow. Will post any codes here. Where did I say I had a stainless exhaust? because I haven't!!

Thanks

Baz