limeyscott
CEG'er
My 00 svt has an issue. Before you all start, yes I have searched and exhausted all my options. The car idles fine.....until you blip the throttle. It will then rev up to 2k rpm and stay there for 5-10 seconds and then drop back to 1000 rpm. It will remain there until you touch the throttle again at which time it will do the same thing again. Also, when it is is idleing at a "somewhat" normal level......which seems to be about 1000 ( yes I know that too is high) it surges between 1000 and 1100 rpms.
I have changed the iac three times, throttle position sensor and maf. I have cleaned out the throttle body, EGR passages etc. I have replaced the UIM LIM gaskets as well as egr iac and tb gaskets. I have checked the alternator (per a post I found) and checked for vacuum leaks.
Now the technical stuff. Long and short term fuel trim seems to go up and down with the idle....BUT is negative pretty much all the time. This tells me there is no vacuum leak since the engine is trying to "lean out" the mixture (subtract fuel) which is the opposite of what would happen in a vacuum leak situation.
I have searched identifix.....a national vehicle fix database and come up with nothing. I have searched these forums and have nothing.......Somebody, please help as I have 6 hours in this diagnosis and am at my wits end.
I have changed the iac three times, throttle position sensor and maf. I have cleaned out the throttle body, EGR passages etc. I have replaced the UIM LIM gaskets as well as egr iac and tb gaskets. I have checked the alternator (per a post I found) and checked for vacuum leaks.
Now the technical stuff. Long and short term fuel trim seems to go up and down with the idle....BUT is negative pretty much all the time. This tells me there is no vacuum leak since the engine is trying to "lean out" the mixture (subtract fuel) which is the opposite of what would happen in a vacuum leak situation.
I have searched identifix.....a national vehicle fix database and come up with nothing. I have searched these forums and have nothing.......Somebody, please help as I have 6 hours in this diagnosis and am at my wits end.