Ems Posted June 28, 2015 Share Posted June 28, 2015 The C20XE on my Manta starts ok but has a rough idle. I've now fitted new plugs (do you need to set the gap on the GM plugs with the 2 electrodes on the sides?), leads, rotor arm and dizzy cap but it's still the same. Any suggestions? Thanks Quote Link to comment Share on other sites More sharing options...
rutts Posted June 28, 2015 Share Posted June 28, 2015 Possibly idle valve common problem. Remove the pipe from your inlet cap spray either carb cleaner or a bit of wd down leave for a while refit pipe see if better. Same idle valve on some saabs or many opel variants. Sutty had same issue last mionth 1 Quote Link to comment Share on other sites More sharing options...
opelman Posted July 13, 2015 Share Posted July 13, 2015 I had exactly this on mine, it was the hose from the servo to inlet manifold, it was the only original hose on the car and had perished. Quote Link to comment Share on other sites More sharing options...
Sutty2006 Posted July 13, 2015 Share Posted July 13, 2015 Idle control valves are a pain in the back side. Ive got 3, all of them make the engine run different. And they are hard to get out if its still under the manifold. I tried to relocate mine to behind the power cap but need to have steel hose as the original isnt strong enough. Quote Link to comment Share on other sites More sharing options...
Ems Posted July 13, 2015 Author Share Posted July 13, 2015 Thanks for the replies, I can't start it at the moment as I'm wiring in the alarm/immobiliser. It's still located under the manifold at the moment, hadn't thought of moving it. Does this only affect the revs at idle when the car is cold? Quote Link to comment Share on other sites More sharing options...
mickappy Posted July 14, 2015 Share Posted July 14, 2015 no usually ok when cold just crap when warm. and at idle... Quote Link to comment Share on other sites More sharing options...
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