Died on Highway, sounds like CPS with a twist
#21
I replaced the crankshaft position sensor last week and also replaced it about a year and a half ago. I have not changed the camshaft position sensor. I'll look into it but I believe that usually throws a code. The genuine parts for the camshaft sensor are a couple hundred dollars but there are some cheap $30 ones around. I might throw one in just to see if it catches.
I'm running out of time on this, I have to move on the 30th so will have to tow the Rover if I can't get it up and going by then... Awful timing. Will try an ECU/BCU swap next, will report back tomorrow on that.
I'm running out of time on this, I have to move on the 30th so will have to tow the Rover if I can't get it up and going by then... Awful timing. Will try an ECU/BCU swap next, will report back tomorrow on that.
#22
I replaced the crankshaft position sensor last week and also replaced it about a year and a half ago. I have not changed the camshaft position sensor. I'll look into it but I believe that usually throws a code. The genuine parts for the camshaft sensor are a couple hundred dollars but there are some cheap $30 ones around. I might throw one in just to see if it catches.
I'm running out of time on this, I have to move on the 30th so will have to tow the Rover if I can't get it up and going by then... Awful timing. Will try an ECU/BCU swap next, will report back tomorrow on that.
I'm running out of time on this, I have to move on the 30th so will have to tow the Rover if I can't get it up and going by then... Awful timing. Will try an ECU/BCU swap next, will report back tomorrow on that.
#23
So the ECU/BCU doesn't work in my Rover so I can't try that. I did a compression test today in cylinder 1 and it was around 30psi with ignition and fuel off. So my next question.
How can I rule out timing chain vs head gaskets vs anything else?
I did head gaskets about 4000mi ago due to significant oil and cooant leaks that slowly developed. Can they fail suddenly and quietly?
How can I rule out timing chain vs head gaskets vs anything else?
I did head gaskets about 4000mi ago due to significant oil and cooant leaks that slowly developed. Can they fail suddenly and quietly?
#24
Check the compression in the other cylinders. Pull the fuel pump relay while testing and hold your foot to the floor. Check at least 4, two on each side. If they are all 30 you almost assuredly have a broken timing chain. You can pop a valve cover off and see if any of the rockers are moving.
#25
With the ignition off? Did you crank the engine by hand or with the starter? Did you jump out the starter somehow? You need to crank it with the starter for several revolutions to get a good reading. If you used the starter and only got 30 psi, you need to check more cylinders like Extinct said. If all are low, you have a timing chain or camshaft issue, ASSUMING your head gaskets are good.
#26
I'm going to assume the head gaskets are okay in this case and go with a likely cam or timing chain issue.
I checked two cylinders on each side with fuel pump relay out and pedal to the floor.
Cylinder 1 - 30psi
Cylinder 5 - 27psi
Cylinder 2 - 0psi
Cylinder 6 - 3psi
So I know I'm screwed based on this but where do I start to unscrew myself?
Would a sudden failure of timing chain be audible?
Can failure of the camshaft sensor cause this and not throw a code?
I meant to say earlier that I had taken out the fuse to the coils, not ignition, when doing the compression test. Though I could technically power the starter without powering the ignition since I have a starter toggle.
I checked two cylinders on each side with fuel pump relay out and pedal to the floor.
Cylinder 1 - 30psi
Cylinder 5 - 27psi
Cylinder 2 - 0psi
Cylinder 6 - 3psi
So I know I'm screwed based on this but where do I start to unscrew myself?
Would a sudden failure of timing chain be audible?
Can failure of the camshaft sensor cause this and not throw a code?
I meant to say earlier that I had taken out the fuse to the coils, not ignition, when doing the compression test. Though I could technically power the starter without powering the ignition since I have a starter toggle.
#27
You have to start somewhere, easiest thing to check first is pull the upper intake and a valve cover to see if any rockers are moving. You have to pull the oil pan and everything off the front of the engine to get the timing cover off. ..which you'll have to do anyway if it's the chain. But if it's a bigger problem like a worn or snapped camshaft, you'll know with a valve cover off. A bad cam sensor will not cause low compression, it has to be something mechanical. My money is on the timing chain/gears. ..May not hear it go, doing 90.
Last edited by wjsj69; 11-18-2021 at 02:30 PM.
The following 3 users liked this post by wjsj69:
#28
The following 2 users liked this post by ArmyRover:
Richard Gallant (11-19-2021),
wjsj69 (11-19-2021)
#29
Been a long couple weeks, just got around to doing a compression test with some oil down cylinder 8.
Before oil - 30psi
After oil - 70psi
So does this definitively tell me this is a valve seats problem? All help has been much appreciated. Just want to know I'm on the right track before I buy a kit to replace the valve seats.
Before oil - 30psi
After oil - 70psi
So does this definitively tell me this is a valve seats problem? All help has been much appreciated. Just want to know I'm on the right track before I buy a kit to replace the valve seats.
#30