GREENSUBIE Posted April 21, 2009 Share Posted April 21, 2009 I just did a spfi swap on my 86 hatch, runs great except for when i stop at a red light or stop sign ect... the rpms rise to about 2800 rpms and holds till i take off. and then runs fine and when i stop same thing. its very frusterating cuz i cant afford it to be burning gas like that. and i dont know much bout spfi, ive checked: for vaccum leaks there are none, timing is good, and idk what to do Thanks SS Quote Link to comment Share on other sites More sharing options...
Twitch de la Brat Posted April 21, 2009 Share Posted April 21, 2009 If its a spfi (single point fuel injection aka throttle body injected), try cleaning the throttle body. That can get pretty messed up with grease and grime. Also check for vacuum leaks with a spray bottle of soapy water. If you have a leak you may be able to get bubbles to show up on the offending hose. If its mpfi (multi port fuel injected) I would look into having it scoped by a certified tech. And do a vacuum leak test before you take it to a tech. Twitch Quote Link to comment Share on other sites More sharing options...
silverhelme Posted April 21, 2009 Share Posted April 21, 2009 Check the coolant temp sender. Mine had a similar problem since it was installed. Unplug it and see if it returns to normal idle if it does find a replacement. As an afterthought is your gas mileage not quite what you expect? If not that is probably the culprit barring vac leaks. Quote Link to comment Share on other sites More sharing options...
GREENSUBIE Posted April 21, 2009 Author Share Posted April 21, 2009 Check the coolant temp sender. Mine had a similar problem since it was installed. Unplug it and see if it returns to normal idle if it does find a replacement. As an afterthought is your gas mileage not quite what you expect? If not that is probably the culprit barring vac leaks. Well i filled the gas tank to see my new mileage and so far its getting pretty good, with this high idle thing, so im expecting a little better after i figure out the idle problem, but ill check the coolant temp sender. thanks SS Quote Link to comment Share on other sites More sharing options...
GREENSUBIE Posted April 22, 2009 Author Share Posted April 22, 2009 The temp sensor was the problem. Much Thanks SS Quote Link to comment Share on other sites More sharing options...
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