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wolfgangschneider69

Avantime poor starting and high fuel consumption

I've got a 2003 Renault Avantime (gasoline engine) and I've noticed fuel consumption has increased, and it's difficult to start, especially when cold. It has 150744 km on the clock. Could it be the throttle body? I've also read the accelerator pedal module may be defective and cause similar symptoms. Any ideas?

Summary of the thread

A 2003 Renault Avantime was experiencing poor starting and increased fuel consumption, particularly when cold. The initial suspicion was a faulty throttle body or accelerator pedal module. After a workshop diagnosis, the issue was confirmed to be a defective accelerator pedal module, which was replaced, resolving the problem and restoring normal fuel consumption.

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4 comment(s)

rainerschmidt3

Sounds familiar. I had a similar problem with my old Volvo V70. Higher fuel consumption and poor starting were the main symptoms. Have you checked the throttle position sensor? It might be sending incorrect data to the ECU, messing with the fuel-air mixture. Does the engine idle smoothly, or is it erratic?

wolfgangschneider69 (community.author)

The engine idle is somewhat erratic, yes. Could you elaborate on your experience with the throttle position sensor? Did replacing it resolve the issue in your Volvo?

rainerschmidt3

Yep, replacing the throttle position sensor fixed it for me. But given your erratic idle, I'd say get it checked by a workshop first. Could be the throttle body itself needs cleaning or replacement, or even the accelerator pedal module as you suspected. A diagnostic scan should pinpoint the exact cause.

wolfgangschneider69 (community.author)

I took it to the workshop, and indeed, the accelerator pedal module was defective, as I initially suspected. The replacement cost was 205€. Now the car runs smoothly and fuel consumption is back to normal. Thanks again!

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RENAULT

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AVANTIME