P38A New crank sensor not working?

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Had a look on YouTube re timing chain. Could It knock the fip out of time. The rpm at idle is 1000 and wont rev past 2200. I'm wondering why the valves didn't collide with the pistons..
 
Musicmaker said:
The only fault recorded was 'Rpm sensor comparison not ok'
Click to expand...

Wish you had said that earlier. Would think it has certainly jumped a tooth or two. Get yourself a locking pin take the cam cover off. Then lock engine at TDC number one firing. Look at cam lobes on number one. They should be flat across the top. Bet they aren't. You have a lot of work to do. It is not an every day easy job unless you know what you are doing.
 
Musicmaker said:
Had a look on YouTube re timing chain. Could It knock the fip out of time. The rpm at idle is 1000 and wont rev past 2200. I'm wondering why the valves didn't collide with the pistons..
Click to expand...

Yes and valve timing. Bottom chain drives pump sprocket from crank sprocket (the one that will have jumped) then in turn top chain is driven from pump sprocket to turn cam shaft. So if chain has jumped crank sprocket everything is out. The MIL lamp is on because number four injector signal (point of injection) is to far out of step with CPS signal.
If you had mentioned AA mans comments and diag readings in first post i could have told you what was wrong straight away.
 
Last edited:
Sorry guy's thought I mentioned the rpm sensor on this thread. I did mention it on my power steering thread. Senior moment. However thanks for your input and will check out the timing chains soon.
 
Update: Turned out that the lower timing chain had in fact jumped a cog, thankfully causing no damage to the valves. Myself and my mate fitted in a new lower timing chain and tensioner rail. We set up and double checked the camshaft and crankshaft timing, turning the engine by hand checking that the timing marks on the chain and sprockets lined up every revolution. We removed no 1 injector to double check that no 1 piston was at TDC, probably overkill
Fitting the chain was straight forward enough (we both have experience in this work ) however, a time consuming job the hardest part was fitting the timing case cover. We gave up after a few fruitless attempts. The funny thing was, next day the cover fell into place first attempt lol.
Thanks everybody for your input which was very much appreciated. Billy.
 
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