Speedo zeros and power drops
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paul406hdiest
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- Joined: Sun Oct 05, 2008 11:34 am
Speedo zeros and power drops
Strange one here every now and then my speedo drops to zero and at the same time the power drops only a tiny fraction as though I have lightly lifted my right foot , I can still accelerate etc , after a while the speedo cmes back and I feel the power come back. Any ideas?
Re: Speedo zeros and power drops
Very odd. I can't see how the two are related unless something's causing the ECU to temporarily enter limp-home mode
Is it a D8 or D9?
Is it a D8 or D9?
<steve_earwig> I think this forum is more about keeping our cars going with minimal outlay than giving our cars more reason to go bang
Re: Speedo zeros and power drops
loose sensor. its in one of the back wheels.
Thr air flow meter is determined by speed, so it switches off when the car thinks its doing 0mph, hence no power.
Thr air flow meter is determined by speed, so it switches off when the car thinks its doing 0mph, hence no power.
Last edited by eoin27 on Wed Feb 25, 2009 12:26 am, edited 1 time in total.
2000 D9 Coupé 2.0 SE EW10J4 Scarlet Red - 5 litres of oil gone in 500 miles!!! Time for a new coupe me thinks
Re: Speedo zeros and power drops
You're putting your money on it having a MAF sensor? 
Paul: What engine is it?
Paul: What engine is it?
<steve_earwig> I think this forum is more about keeping our cars going with minimal outlay than giving our cars more reason to go bang
Re: Speedo zeros and power drops
Judging by your user name it's a hdi, in which case its either a bad connectio on the speedo sensor which is on the diff, or it's a bad connection in the dash. Plenty of info on here if you search speedo.
406 HDI Exec Estate (2 off) & 307CC HDI Cabriolet
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paul406hdiest
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- Joined: Sun Oct 05, 2008 11:34 am
Re: Speedo zeros and power drops
its a 2l HDi , the power drop is very very tiny its no like a limp home mode , any sensors etc i need to check?
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steve_earwig
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Re: Speedo zeros and power drops
Unskilled meddling sin©e 2007
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paul406hdiest
- Newbie
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- Joined: Sun Oct 05, 2008 11:34 am
Re: Speedo zeros and power drops
ca I bee wiggled or cleaned , and is it easy to get to? still waiting for haynes to arrive 
Re: Speedo zeros and power drops
If you want to check out the haynes manual now i have it in a pdf
1997 2.1 TD Exec (Sold)
1997 3.0 V6 Coupe S (Sold)
2001 406 HDi 110 GTX (Sold)
2002 406 Coupe HDi SE (RIP)
2003 406 Estate HDi 2.2 SE (Sold)
2003 406 Coupe HDi SE (To be sold)
2001 406 Coupe 3.0 V6 SE
2003 406 2.2 HDi SE
1997 3.0 V6 Coupe S (Sold)
2001 406 HDi 110 GTX (Sold)
2002 406 Coupe HDi SE (RIP)
2003 406 Estate HDi 2.2 SE (Sold)
2003 406 Coupe HDi SE (To be sold)
2001 406 Coupe 3.0 V6 SE
2003 406 2.2 HDi SE
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ijmorrison
- 1.8 8v
- Posts: 29
- Joined: Sun Jan 18, 2009 4:04 pm
- Location: Great Yarmouth, Norfolk
Re: Speedo zeros and power drops
Mine does / did the same thing ... it's an x reg (sep 2000) 2.0 hdi.
I recently went to change the battery (ALWAYS check the spare batteries have the terminals in the right postition .. dam
)and ended up just giving the terminals on the old battery a good polish and resealed with white lithium grease ...
Since then i have not had it drop .. so maybe a bad earth ? equally it hasn't rained like it was before the mini op .. so maybe related ? i.e. possibly the multiplug in the drivers swimming pool .. er footwell ...
Iain
I recently went to change the battery (ALWAYS check the spare batteries have the terminals in the right postition .. dam
)and ended up just giving the terminals on the old battery a good polish and resealed with white lithium grease ...Since then i have not had it drop .. so maybe a bad earth ? equally it hasn't rained like it was before the mini op .. so maybe related ? i.e. possibly the multiplug in the drivers swimming pool .. er footwell ...
Iain