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Trying to resolve slight rough idle found another problem!
So my 97 xk8 has a rough idle. The plugs and coils seem fine, I have cleaned the mag sensor, and I have sprayed around with carb cleaner looking for a vacuum leak with no change. I was looking around the throttle body and on the left side I noticed some cut wires. I’m trying to figure out what they go to, but am hitting a wall. They are orange and black. Not sure what it is, but maybe a cause for the idle?
Can you please give us some description of the location? Dead reckoning is not going to work from the photo for me mate. Argh looks like I just needed a 2nd look- that's the throttle cable isn't it?
I'll take a look at mine if someone else doesn't jump on this.
Yes that's the throttle cable. Left side of the throttle body. There is a 5 wire connector above it. I used to have a aj8 manual downloaded, but I can't find it. Drrrrr
The only orange/black pair that I can see around that area is to the cam position sensor & there is a connector in that location on my car. #15 in this snippet:
No codes at all. I haven't tried pulling on my coil wires, but I did just have a similar wire issue on my XJS. It definitely feels like rough idle, kinda like an old sbc with a mild to mid cam. Not real bad, just not really smooth. I am wondering if it maybe some of my slight shake while driving at low rpm too.
Just wonder if the installed new CPS had it's on wire pigtail and the the old wires ran through the loom and they just cut the wire to get the plug to solder on to the new one.
If they mover the Throttle Position Sensor or it's not making good contact, something to look at.
Just wonder if the installed new CPS had it's on wire pigtail and the the old wires ran through the loom and they just cut the wire to get the plug to solder on to the new one.
If they mover the Throttle Position Sensor or it's not making good contact, something to look at.
It looks like they were just snipped. I didn't look around too hard for the ones from the wire harness, but maybe tomorrow. I'm tempted to pull the splices at the tps and see if there may be corrosion in them
so I finally decided to pull my throttle body today and look around. I’m not sure what the connector from the first post was, but as you can see, it goes nowhere! I also pulled on the spliced wires at my tps and one of them broke easily. I think all but 2 strands were broken. Another one broke fairly easily too. I cut off the connectors and the wires all had corrosion at the tips. I cleaned them up and then thought to look at my spare throttle body. My spare had a connector on it with about 3 inches of wire on it, so I decided to use that one to solder and shrink tube then electrical taped over top. I decided to try my spare tb and put it all together again. I started the car and it idled high and immediately got an engine fault and nothing happened when I pressed the pedal . . I thought maybe I had to let the computer relearn the throttle body since I had swapped it, so I started to pull everything out of the trunk and got to the battery. I looked at it and thought “double check connectors first”. I walked up front and sure enough I hadn’t connected the throttle sensor on the left. I connected it and started it again. Idled well and rpm increased with pedal! Yay! I took it for a drive and it seems smoother, not perfect, but definitely better! Ok so I just realized that the tps is probably the sensor on the left. What’s the 4 wire one on the right side?
08-06-2019, 11:41 AM
Trying to resolve slight rough idle found another problem!
. . I thought maybe I had to let the computer relearn the throttle body since I had swapped it, so I started to pull everything out of the trunk and got to the battery. I looked at it and thought “double check connectors first”. I walked up front and sure enough I hadn’t connected the throttle sensor on the left. I connected it and started it again. Idled well and rpm increased with pedal! Yay! I took it for a drive and it seems smoother, not perfect, but definitely better! Ok so I just realized that the tps is probably the sensor on the left. What’s the 4 wire one on the right side?
