this is an idle question, but split up into a couple different ones. I am waiting on my Keyspan serial to usb adapter to come in to hook up data logger. keep in mind my car runs pretty well...driveability not a factor here. just trying to iron out this issue.
symptoms:
1. most of the time, car idles well...stays around 900rpm. car will warm up at 2k rpm, and will come down to 900~ after its warmed up. However, there are times, the idle will keep at 2k, esp after a highway run. Eventually, if I drive the car long enough, it'll come down to 900, then slowly surge up to between 1100-1500 and come back down to 900, then repeat.
2. 75% of the time, the car runs well...the motor feels solid, boosts well. however the other 25% of the time, I can feel the motor becoming butter smooth..a bit quieter and seems like flat out runs better. idles well most of the time.
3. when I adjust the idle by grounding the connectors, it'll idle rock steady, then when I disconnect the grounds, it'll idle a little more erratically.
my big suspicion is the ect sensor. I tried to replace it last week to give it a shot, but received the wrong one. I was gonna wait to hook up the data logger to see what it tells me but waiting on the Keyspan adapter is taking awhile. I also do not have a multimeter here with me.
I'm wondering if symptom #2 is telling me that most of the time, my car is not reading fully closed loop? anyone else experience this? ISC's been replaced in Sept, intercooler piping t-bands get tightened/checked once every couple weeks. I'm getting right about 20mpg or so.
symptoms:
1. most of the time, car idles well...stays around 900rpm. car will warm up at 2k rpm, and will come down to 900~ after its warmed up. However, there are times, the idle will keep at 2k, esp after a highway run. Eventually, if I drive the car long enough, it'll come down to 900, then slowly surge up to between 1100-1500 and come back down to 900, then repeat.
2. 75% of the time, the car runs well...the motor feels solid, boosts well. however the other 25% of the time, I can feel the motor becoming butter smooth..a bit quieter and seems like flat out runs better. idles well most of the time.
3. when I adjust the idle by grounding the connectors, it'll idle rock steady, then when I disconnect the grounds, it'll idle a little more erratically.
my big suspicion is the ect sensor. I tried to replace it last week to give it a shot, but received the wrong one. I was gonna wait to hook up the data logger to see what it tells me but waiting on the Keyspan adapter is taking awhile. I also do not have a multimeter here with me.
I'm wondering if symptom #2 is telling me that most of the time, my car is not reading fully closed loop? anyone else experience this? ISC's been replaced in Sept, intercooler piping t-bands get tightened/checked once every couple weeks. I'm getting right about 20mpg or so.
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