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XJ40 ( XJ81 ) 1986 - 1994

Intermittent Stalling, Other Issues

 
  #21  
Old 03-11-2019, 02:03 PM
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Originally Posted by cooldood View Post
Just for 100% clarity, I would not say it re-displayed (suggesting some flicker or change) the mileage, just that the display never changed? Agree or disagree?
Cheers,
John
Hey John, I think you're ok regarding the VCM code etc., The earlier cars like yours have a smaller number of codes (8 I think?) and VCM fault codes are usually (if not always) flagged in combination with the check engine light. With my late model car, if I get the check engine light and press the VCM the code displays, otherwise just the mileage.

In my experience, there are exceptions to the above, one is when the display changes to PAD after a press (low brake pads) and another (IIRC) when it displays the word FAIL without a corresponding FF and a number - of course I can't remember what that means but it was a very long time ago I had that.

In both of those cases though, the check engine light didn't illuminate. In your case, I don't think you have any DTC's stored.

CPS sensors are pricey all right, at that price, you could pick up a running parts car!

The CPS does give trouble and it is good to have a spare but with a cold start ok and hot start not I think it wise to check out the coolant sensor circuitry first, certainly a more economical step if you're going to start replacing components.

This may not apply to your car directly but this ain't a bad article on the CTS ..

https://www.jaguarfuelinjectorservic...e%20Sensor.htm

Larry



 
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Don B (03-11-2019)
  #22  
Old 03-11-2019, 02:29 PM
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Thanks Larry. I think we can lay the VCM messages to bed, nothing to see here. :-) A used CPS might be something to try first, if warranted to have come off a running car.

The resistances in the linked article match well with what I see from my CTS. I do have a new NAPA supplied one, but have not fitted it as yet, due to the acceptable resistances. I noted that voltage supplied to the CTS without the engine running was only 4.2V, but it was 5V when the engine was running.

I have no idea if there is a fault in the CTS wire running back to the ECU. That sounds like a task for another day.

I can certainly try the paperclip trick next time, hopefully tonight, after removing the CPS and cleaning/replacing it
 
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  #23  
Old 03-11-2019, 03:15 PM
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I was having similar issues, that were all pertaining to fouling of my TPS. If that is not reading properly, it can go into limp mode and hesitate. Its attached to the underside of intake and it gets oil in it very fast.
 

Last edited by Brewtech; 03-11-2019 at 03:32 PM.
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  #24  
Old 03-11-2019, 09:25 PM
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Tonight I got the bolt out (T30) that was holding in the CPS.

The CPS was quite cruddy, wiped it clean and it looked fine. Reinstalled it (noted that it looks like it is not oem, the cable running to it is white, and the red/blue/black wires from the connector disappear into some electrical tape and emerge as the white cable. Peeled off the tape to confirm this. No idea what effect that might have on the functionality of the CPS, but I guess I ran the last 1500 miles since we took ownership, and presumably prior to that - there is a used one on eBay for $50, I think I will grab that for now to at lest have oem one).

Car started, but was rough, then cleared, then wanted to idle at closer to 2000 rpm, black smoke from the exhausts. Switched it off fairly quickly and then it would not restart, even though it really could not have warmed up much at all.
Getting dark, time to stop.
Tomorrow I will change out the water temp sensor, and look for the TPS.
 
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  #25  
Old 03-13-2019, 12:44 PM
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Last night I swapped out the water temperature sensor with a replacement from NAPA. Car would not start afterwards.
Located the throttle position sensor, on the underside of the the throttle body. It did seem wet with oil.
Perhaps one of the tasks this weekend will be the removal of the throttle body and a more thorough cleaning of that. The replacement TPS is on its way, hoping that cures all.

Other upcoming tasks include the intercooler water pump on the X350 and an exhaust manifold gasket on the Grand (never has a word been so misused) Caravan.
 
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  #26  
Old 03-13-2019, 01:37 PM
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Located the throttle position sensor, on the underside of the the throttle body. It did seem wet with oil.
They can be carefully pried apart and cleaned with contact cleaner or as some prefer holes drilled in them to blast out and drain the gunk inside....

anyway you've got a new one on the way .. interesting that the car wouldn't start with the new temp sensor ...how 'crispy' is the harness I wonder?

Thanks for updating, look forward to next report!

cheers

Larry
 
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  #27  
Old 03-15-2019, 06:12 PM
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The new (used) CPS arrived today.
She lives again.
Idle is a little lumpy, but we got all the way around the block, and more importantly, back again. And we restarted when hot.
More testing tomorrow, when I am not so in need of getting home again without waiting for AAA.
​​​​​​​
 
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  #28  
Old 03-20-2019, 10:12 PM
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Back to the drawing board then.
Went out tonight, she ran fine for around 30 minutes, round town, bit of freeway, open road, then as we were pulling up at the house, there was the hesitancy. Went back round the block to confirm and got the major pause after pressing the throttle before there was power. Back to the house, switched off and she will not start again. Noises from the gas tank were noticeable (she has the external fuel pump, which is quite a different noise), released the cap and there was a small vacuum, but made no difference to the starting - assume it was the return pipe discharge I could hear.

I guess I need to work through more of the options then, or look for another CPS?
 
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  #29  
Old 03-21-2019, 03:41 PM
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TPS? Clean it and set it to spec
 
 
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