checked all vac lines replaced a few mushy ends and lines. when i put in gear it idles down to 1100. tps has no adjustment, but old one replaced did not have it idiling this high ? light comes on , says tps code ? any suggestions ? 87 gt 2.8 I changed to rodney dickmann thermastat setup which dont feel has any thing to do with high idle
[This message has been edited by traceymac (edited 12-24-2021).]
The EGR tube on the Fiero V6 is notorious for cracking. If the engine doesn't stall with your finger covering the IAC port (and throttle closed), you've got a vacuum leak... and/or possibly someone has messed with the idle stop screw. (There should be a "plug" covering/hiding the head of this screw.) To take the idle stop screw out of the equation, cover the entire opening to the throttle body with the palm of your hand while the engine is running. If the engine still runs, there is definitely a huge vacuum leak somewhere.
[This message has been edited by Patrick (edited 12-24-2021).]
------------------ Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should. (Jurassic Park)
Check hidden hose. Remove throttle body and you'll see a rubber 90 degree hose connecting intake to throttle body. I've seen that hose deteriorate & crumble and it's not a tight enough fit to suite me. Your problem could be there. I don't have a pic but perhaps someone else will.
Spoon
------------------ "Kilgore Trout once wrote a short story which was a dialogue between two pieces of yeast. They were discussing the possible purposes of life as they ate sugar and suffocated in their own excrement. Because of their limited intelligence, they never came close to guessing that they were making champagne." - Kurt Vonnegut
The tube labelled as #5 above is what provides added air when the IAC valve opens. I find it odd to see it identified as a "Cold start valve air tube".
