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        General >> Problems >> Top gear
        
(Message started by: johnaaronrose on May 14^th, 2007, 8:54am)

Title: Top gear
Post by johnaaronrose on May 14^th, 2007, 8:54am

Intermittently for the last week, the car either refuses to select top gear, or changes immediately back into third gear if I increase and then decrease pressure on accelerator.

I've looked on the Fault Finder and the most likely possibility is: "Won't select upper gears: Refuses to engage higher gears? also speedo needle jumps or stays at 0? YES: 1. VSS sensor faulty 2. Wiring loom fault
".

However, the speedo needle does not jump. Any ideas, please?

Title: Re: Top gear
Post by Octavian_P on May 14^th, 2007, 9:19am

Hi there, from the description of your profile i see that you are talking about a 2.3 The first thing to start with will be the cleaning of the Mass Air Flow sensor or in short MAF. The procedure is here (http://www.fordscorpio.co.uk/cleanmaf.htm) In most of the cases this MAF is crucial for optimum gearbox changes.

Title: Re: Top gear
Post by John Rose on May 19^th, 2007, 12:55pm

Hi Octavian_P,

Thanks for the advice. Tried cleaning the MAF wires. I think it has improved. However, it's still not staying in overdrive for long. As soon as I depress the accelerator slightly, the revs increase by 1,000 approx. I'm wondering if it could be the accelerator assembly sticking slightly. Is that possible?

Regards,
John

Title: Re: Top gear
Post by Octavian_P on May 19^th, 2007, 2:22pm

on 05/19/07 at 12:55:06, John Rose wrote:

Hi Octavian_P,

Thanks for the advice. Tried cleaning the MAF wires.

Are you referring to the MAF connector ?

In this article here the third picture shows the maf internal sensors. Are they clean or they are blackened.

http://www.fordscorpio.co.uk/cleanmaf.htm

Title: Re: Top gear
Post by John Rose on May 19^th, 2007, 3:00pm

The MAF internal sensors as in the 3rd photo. They are now clean.