stephenspann27
NAXJA Forum User
- Location
- College Station, Tx
I'm in the process of troubleshooting an erratic idle...my '87 XJ AW4 will idle normal, then low, and then back to normal. If its hot, and sits a few minutes, when I crank it it will misfire for the first few minutes at idle ( I know it sounds like hot soak). However, it will have the erratic idle even when the engine is cold. I'm getting 20mpg... so nothing is terrible out of wack.
So far I've replace the MAP sensor, swapped throttle bodies, TPS, IAC, and tonight I replaced all the injectors with mustang #19's. Fuel Pressure is spot on.
While ago I crawled under it and unpluged the CST with the engine running, it didn't seem to make a difference pluged in vs, unplugged. However, i check the sensor with a multi meter and it read .547 with my multi meter set on "2k" According to this site: http://www.lunghd.com/Tech_Articles/Engine/Basic_Sensors_Diagnostics.htm
it should be around 547 not.. .547.. The engine was probably around 80 degrees.. I had driven it an hour earlier.. and it had idled a few minutes.
Someone please let me know if that reading means its good.. it doesn't read "open" at least....
I noticed in the wiring that goes to the knock sensor, there is random bar wire hanging out before it goes into the sensor. The knock sensor only has two wires.. and it has two good wires going to it.. there just this 3rd bare wire hanging out of the harnes near it.. I also noticed I cut in the '02 sensor wiring.. and taht the O2 sensor plug is a little melted.. so I'll check that out soon.
So far I've replace the MAP sensor, swapped throttle bodies, TPS, IAC, and tonight I replaced all the injectors with mustang #19's. Fuel Pressure is spot on.
While ago I crawled under it and unpluged the CST with the engine running, it didn't seem to make a difference pluged in vs, unplugged. However, i check the sensor with a multi meter and it read .547 with my multi meter set on "2k" According to this site: http://www.lunghd.com/Tech_Articles/Engine/Basic_Sensors_Diagnostics.htm
it should be around 547 not.. .547.. The engine was probably around 80 degrees.. I had driven it an hour earlier.. and it had idled a few minutes.
Someone please let me know if that reading means its good.. it doesn't read "open" at least....
I noticed in the wiring that goes to the knock sensor, there is random bar wire hanging out before it goes into the sensor. The knock sensor only has two wires.. and it has two good wires going to it.. there just this 3rd bare wire hanging out of the harnes near it.. I also noticed I cut in the '02 sensor wiring.. and taht the O2 sensor plug is a little melted.. so I'll check that out soon.