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Topic: Autobox Problem (Read 6199 times) |
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Tekno
Full Member
Tenho Ruohoranta
 
Posts: 599
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Re: Autobox Problem
« Reply #40 on: Jul 5th, 2010, 8:58pm » |
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I'm too having now problems with automatic gearbox
When it should shift no next gear, it just raises rpms and then after couple secs it kicks it in..
I also get P0171 "Too Lean" codes..
here's obd analysis: http://ruohoranta.fi/singapore/galleries/sekalaiset/idle2.PNG
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1998 Ford Scorpio Ultima Estate 2.3i 16V
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Mike H
Senior Member
Renault Clio
Posts: 2594
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Re: Autobox Problem
« Reply #41 on: Jul 6th, 2010, 12:22pm » |
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Have you tried it with MAF unplugged?
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Mike H
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pedropedro
Full Member
Posts: 677
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Re: Autobox Problem
« Reply #42 on: Jul 6th, 2010, 3:55pm » |
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for what its worth on mine which has this problem if you keep a/c on that increases the load on the engine and shifts will be better.. also if you select winter mode it starts in 2nd and again bigger load and shifts better
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Tekno
Full Member
Tenho Ruohoranta
Posts: 599
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Re: Autobox Problem
« Reply #43 on: Jul 8th, 2010, 11:29am » |
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I cleaned MAF and now it's better but not perfect. MafV's are 0.9 and 0.7 at idle. Don't know which is correct
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1998 Ford Scorpio Ultima Estate 2.3i 16V
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Mike H
Senior Member
Renault Clio
Posts: 2594
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Re: Autobox Problem
« Reply #44 on: Jul 8th, 2010, 5:44pm » |
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0.7 I think.
Try driving it with MAF unplugged anyway. 
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Mike H
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Tekno
Full Member
Tenho Ruohoranta
Posts: 599
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Re: Autobox Problem
« Reply #45 on: Jul 8th, 2010, 6:40pm » |
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compared to without maf, WITH MAF connected it feels kinda sluggish or spongy, like always waiting for me to press accelerator more.. gearshifts are very sharp though 
Without MAF it starts to speed up immediately and no waiting.
here's after second cleaning: http://ruohoranta.fi/singapore/galleries/sekalaiset/Scorpio-98/idle4.PNG
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1998 Ford Scorpio Ultima Estate 2.3i 16V
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Mike H
Senior Member
Renault Clio
Posts: 2594
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Re: Autobox Problem
« Reply #46 on: Jul 8th, 2010, 6:56pm » |
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Oh-kay, back to the original issue, does the gearbox behave more normally do you think while MAF is unplugged?
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Mike H
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Tekno
Full Member
Tenho Ruohoranta
Posts: 599
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Re: Autobox Problem
« Reply #47 on: Jul 8th, 2010, 6:57pm » |
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yes absolutely no "slipping/rpm raising"
I wonder why there is two voltages for MAF in obd software
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1998 Ford Scorpio Ultima Estate 2.3i 16V
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Mike H
Senior Member
Renault Clio
Posts: 2594
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Re: Autobox Problem
« Reply #48 on: Jul 8th, 2010, 8:40pm » |
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Ah-ha!! Right so.
We-ell, I thought OK well a new MAF sensor is like >£50 from buypartsby so go for it see if a brand new one makes a difference, and it did. I guess these things do wear out, though you'd think there's nothing to wear out.
Not sure about the question though
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Mike H
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Cosray
Full Member
8th Scorpio, 2nd Cosworth: currently '95
Posts: 569
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Re: Autobox Problem
« Reply #49 on: Jul 8th, 2010, 8:59pm » |
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Yes Mike. Not only in Scorpio's.
My friend Willem the other day was stopped by his own Jeep's engine management going into LOS because one tyre was down to halfpressure - would not let him drivefaster than 20 MPH - apparently the manufacturer, being afraid of claims, has this behaviour programmed into the ABS which then directs his engine management to speedlimits...
In Scorpio's ABS will detect a permanent diff in wheel rev's and generate a fault code.
Ray
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Mike H
Senior Member
Renault Clio
Posts: 2594
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Re: Autobox Problem
« Reply #50 on: Jul 9th, 2010, 9:34am » |
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That's great, so instead of being able to stop safely on the hard shoulder with a puncture, you're rammed up the back by an artic in the middle lane 
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Mike H
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Mike H
Senior Member
Renault Clio
Posts: 2594
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Re: Autobox Problem
« Reply #51 on: Jul 9th, 2010, 9:37am » |
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on Jul 8th, 2010, 6:57pm, Tekno wrote:yes absolutely no "slipping/rpm raising"
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OK so that proves there's nothing wrong with the box after all. I've also been down the road of considering getting a 2nd hand one, which wouldn't have solved it
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Mike H
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Cosray
Full Member
8th Scorpio, 2nd Cosworth: currently '95
Posts: 569
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Re: Autobox Problem
« Reply #52 on: Jul 9th, 2010, 12:04pm » |
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on Jul 8th, 2010, 8:40pm, Mike H wrote:Ah-ha!! Right so.
I guess these things do wear out, though you'd think there's nothing to wear out.
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Yes they do wear out. It's basically a filament made of resistance-material with a higher temperature-coefficient and yes, those properties change over time.
Here's a nice write-up about the subject, explaining its operation and possible specification-shift, unbeknownst to the EEC-V.
HTH
Ray
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Mike H
Senior Member
Renault Clio
Posts: 2594
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Re: Autobox Problem
« Reply #53 on: Jul 9th, 2010, 12:37pm » |
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Yep a heater resistor, and downstream, a thing called a thermistor (I imagine that's most likely what it is), the former can change value due to heat stress, the latter can just get tired and cease to adequately cover its full range of resistance values.
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Mike H
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