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4 Strokes Z1 Turbo / Z1 / T660

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Old 03-24-2011, 01:21 PM   #1
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Did I screw up the TPS (Throttle Position Sensor)

My 2007 AC Z1 is was getting thirsty and started stumbling at low RPM's under load so I figured it needed a check. After reading through posts at this forum I started to suspect the TPS. I wanted to check spark plugs and valve clearances anyway so I took the plunge and removed the tank, air silencer and the lot. Valves were within spec even after 7500 miles but the spark plugs were both really black and I changed to a lower number (from 8 to 7) CR7EIX.

Then I started screwing with the TPS. First I applied 5V (5,08) between blue and black wires and measured between yellow and black. Idle position gave 0.99V and full throttle read 4.41V. Specs says 1.11-1.13 and 4.18-4.36 so I watched the readings as I applied throttle through the range. The readings were erratic with sudden jumps from around 2V down to almost 0 and then back past 2 and fairly steady up to 4.4V. First I adjusted the idle to read 1.12V but then the full throttle said 4.54V no matter how many times I moved it back and forth.

With TPS adjusted to 1.12V at idle I put it all together and made a test run. It was like setting off firecrackers. Next I tore off the tank, air silencer and so on and put the TPS back to where it was before I started. Put all together again and a test without load seemed promising so I fastened all screws and bolts and took a test run. Still firecrackers.

Cannot get a new TPS before after 4.1.11 according to AC and cannot find one to borrow either.

I got the procedure to apply 5V to the TPS from another forum member (radman1) and have had it verified by my local dealer in Norway but I still suspect that I might have missed something with the adjustment. Am I supposed to fiddle with the idle screw (sealed with yellow paint)?
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Old 03-24-2011, 01:34 PM   #2
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-confirm you are indeed powering / checking the correct wires.
-install the correct spark plugs
-confirm throttle cable slack is within spec, if ok, disconnect throttle safety switch.
-spec your running on the tps should be fine, yes you can get it closer by adjusting base idle screw but I doubt it'll make much if any difference.
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Old 03-24-2011, 06:54 PM   #3
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 Quote: Originally Posted by artical View Post
The readings were erratic with sudden jumps from around 2V down to almost 0 and then back past 2 and fairly steady up to 4.4V.
You need a new TPS, the voltage must be a smooth and steady increase from idle to WOT.
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Old 03-25-2011, 07:46 AM   #4
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This is how I got it working again

 Quote: Originally Posted by wbrooks View Post
You need a new TPS, the voltage must be a smooth and steady increase from idle to WOT.
A new TPS is on backorder from AC.

After screwing around with the potentially faulty TPS I found the following procedure to work:
I ignored the idle position readings and adjusted the full open throttle reading to 4.25V. Idle screw back to give around 1400 rpm at idle. The idle position reading was 1.08V (workshop manual says 1.11 - 1.13). Put the lot together and the engine sounded flawless during the short testdrive around the yard. Waiting for the weather to improve just a little to allow for a weekend trip.

Thanks for tips and support. I must honestly say that owners of AC Z1's need lots of encouragement and feedback when troubleshooting. The last excersise required the gas tank and air silencer to be removed 3 times as I had to put load on the engine while testing.
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2007 Z1 Jag, Tunnel and cooler extension, 136" Tracks-USA ext w/1.75 Backcountry track, Fox Float1 and FB Air Can2, 2010 Z1 muffler, Heated seat, 2" riser, Full 2008 Swaybar upgrade, SLP Powder Pro's, 4th wheel kit & 2 idler wheels kit. Split Airbox. Engine heater.
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Old 03-27-2011, 01:20 PM   #5
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 Quote: Originally Posted by artical View Post
A new TPS is on backorder from AC.

After screwing around with the potentially faulty TPS I found the following procedure to work:
I ignored the idle position readings and adjusted the full open throttle reading to 4.25V. Idle screw back to give around 1400 rpm at idle. The idle position reading was 1.08V (workshop manual says 1.11 - 1.13). Put the lot together and the engine sounded flawless during the short testdrive around the yard. Waiting for the weather to improve just a little to allow for a weekend trip.

Thanks for tips and support. I must honestly say that owners of AC Z1's need lots of encouragement and feedback when troubleshooting. The last excersise required the gas tank and air silencer to be removed 3 times as I had to put load on the engine while testing.
Thanks for posting. I summise from what you posted that even though the voltage was eratic when you set it up at wot spec and adjusted idle, you have the sled running well. Please post if it is in fact resolved or if the issue returns. Thanks.
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Old 03-31-2011, 03:27 PM   #6
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08-09 Mileage: 1200
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ATV: no
I just returned from a 5-day trip in the outbacks. The sled runs but is still sucking gas as a drunk sailor. It fires up nice but stumbles in the area of 5000 rpm's and the leaves black spots in the snow at every stop when it idles (exhaust). There may be other issues than the TPS, but without being able to replace it (TPS) I do not want to spend valuable time to troubleshoot it now. Will revert in two weeks time when I get the TPS replaced.
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Old 05-05-2011, 10:38 AM   #7
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08-09 Mileage: 1200
07-08 Mileage: 3000
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ATV: no
2007 Z1 Jag TPS

I finally got the TPS changed before the Easter holidays and what a difference. My fuel milage increased from less than 10 miles/gal to 15 miles/gal and now purrs like the jaguar she was built to be. I'm in love again!
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Old 05-05-2011, 12:34 PM   #8
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Good Job! And thanks for letting us know the outcome.
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