Do Not Sell My Personal Information Jump to content


Throttle body problem?


Flivoless
 Share

Recommended Posts

I have had my SC430 (6 speed) for a few months now and have a problem which I hope some of you cleaver people may be able to throw some light on. The engine idles smoothly at just under 800 rpm but when coming off the throttle at say 40mph for this example (but it's the same at any speed) the revs stay at 1100-1200 rpm so the car does not slow down - taking some 200m reduce speed to 30 mph. However, if the brakes are applied (necessary!) firmly, the revs drop to the normal idle level. Is the throttle body the likely culprit?

Any help will gratefully received.

Link to comment
Share on other sites

Hi Colin, I have now tried with Aircon off but no discernible difference. Also tried in PWR and Norm modes but no difference. It's as if the wheels are driving the engine. Throttle position monitor / gearbox?

As a matter of interest and to, hopefully, increase my knowledge, what was your thoughts behind the Aircon on and off?

Regards

Marc

 

Link to comment
Share on other sites


Hi Marc

Aircon increases the engine load, so to avoid the idle speed dropping too low the ecu increases the throttle opening to compensate, although it overcompensates by design so you have an increased idle with the ac turned on.

I'd start by looking at the throttle body, that probably needs a clean, especially the butterfly, and also give the MAF sensor a clean. (not sure what has happened to the photos, I'll see if I can fix that.

 

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share



×
×
  • Create New...