rgrigsby Posted April 22, 2006 Share Posted April 22, 2006 OK following on from the throttle pot question I have another strange thing happening, when I shut the throttle of whilst driving the revs don't seem to be dying as quickly as I would expect. Ultimatly after a bit of drive the idle moves up to about 1200rpm instead of 1000rpm. To me this suggests the throttle is being held open, so I had a look at the Jenveys and the throttle linkage looks fine, it snaps shut completly with no stickyness at all. So now I'm confused, if the throttle linkage is closing fully how can the throttle be staying open a little?? I have DTH Raceline Jenvey's on a 2.3l Duratec by the way. Rob G www.SpeedySeven.com Link to comment Share on other sites More sharing options...
Big Brother Posted April 22, 2006 Share Posted April 22, 2006 Slight air leak where they join the head? Steve SE7EN-UP! The difference between ignorance and apathy? I don't know, and I couldn't care less! Link to comment Share on other sites More sharing options...
rgrigsby Posted April 22, 2006 Author Share Posted April 22, 2006 Hmm yes that's an option, bugger that could be more of a pain to fix. Guess I better take a closer look. Rob G www.SpeedySeven.com Link to comment Share on other sites More sharing options...
Big Brother Posted April 22, 2006 Share Posted April 22, 2006 WD40 on the joint - if the revs increase you've found the leak Steve SE7EN-UP! The difference between ignorance and apathy? I don't know, and I couldn't care less! Link to comment Share on other sites More sharing options...
Graham Perry Posted April 22, 2006 Share Posted April 22, 2006 Are you supposed to use any form of sealant between the throttle bodies and the head or is it just a thin gasket ? Link to comment Share on other sites More sharing options...
rgrigsby Posted April 22, 2006 Author Share Posted April 22, 2006 I think it varies but on mine I'm pretty sure it was a think gasket, my old Xflow was the same for the DCOE manifold to head seal. Rob G www.SpeedySeven.com Link to comment Share on other sites More sharing options...
dannylt Posted April 22, 2006 Share Posted April 22, 2006 The throttle cable is nicely slack on the linkage at idle? No cracks? Otherwise like has been said, lack of seal against the head (I think you just use sealant rather than any standard gasket). It seems unlikely that they are just out of balance. Link to comment Share on other sites More sharing options...
rgrigsby Posted April 22, 2006 Author Share Posted April 22, 2006 Yup it's slack on the linkage, I wasn't sure that was right but by the sounds of what your saying it is. They were balanced not that long ago so I guess it could be just lack of seal, I had a quick look and I can't see anything obvious but I'll have another play tomorrow. Rob G www.SpeedySeven.com Link to comment Share on other sites More sharing options...
Iain A Posted April 23, 2006 Share Posted April 23, 2006 Hi I had some funnies with my Duratech around idle. The transition from "foot off" to "foot on" the loud pedal was a bit sharp. Also the TPS idle position needed re setting rather too often to keep it running smoothly. In the end it turned out to be the throttle pot breaking down. It finally failed 2 days into a French blat. I had to have another TPS couriered out (Thanks Raceline!) and that solved it. Might be worth a check.. us an AVO to see if the impedance (or voltage if you have the ECU connnected) varies smoothly from one end of the travel to the other.. an oscilloscope would be better than an AVO to catch transients.. but not many people have one of them in their garage. Good luck One of the Duratectives Link to comment Share on other sites More sharing options...
oilyhands Posted April 23, 2006 Share Posted April 23, 2006 This can happen if the ignition advance values at load site 0 are quite high at 1500 and 2000 RPM, make sure these values are very low. Oily Link to comment Share on other sites More sharing options...
Rob Walker Posted April 23, 2006 Share Posted April 23, 2006 Rob, The Raceline TB`s have a machined groove and rubber "O" ring on the mating face to seal them to the head, I would be very surprised if this has failed. Link to comment Share on other sites More sharing options...
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