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Post by studabear on Apr 11, 2023 20:43:23 GMT 1
Engine sounds terrible on that clip, it isn't noisy in anyway.😆
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Post by chippie on Apr 11, 2023 20:50:20 GMT 1
That waveform doesn’t look too bad, a bit raggedy/noisy…engine speed around 2700-2800 Stu? Guessing from the frequency displayed..
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Post by OldGit on Apr 11, 2023 21:11:08 GMT 1
From your description and the screenshot, it sounds like pin grip or contact resistance could be the issue. The waveform looks too noisy & rounded, it's possible the backprobing has shifted the contact position, sometimes it takes one or two ignition cycles before the ECM will 'trust' a previously bad input.
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Post by studabear on Apr 11, 2023 21:27:21 GMT 1
Start of clip was at idle with increase to around 3000rpm I would expect.
Oldgit if it gives more trouble should I get some contact cleaner spray for the sensor and plug?
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Post by chippie on Apr 11, 2023 21:52:02 GMT 1
I’d give it a go with some branded contact cleaner first…..then try and tighten up the female contact if possible, failing that, maybe a replacement connect/cable…
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Post by OldGit on Apr 11, 2023 22:07:41 GMT 1
Contact cleaner will probably make things worse.... great for deagreasing or removing tarnish, not so good for preventing contact fretting. You could try some dielectric grease to stop the contacts moving around - Nyogel 760G is the stuff JLR supply, realistically you'd be better off finding the connector housing & contacts on www.auto-click.co.uk/ (assuming it's the sensor connector contacts that are baggy) - the graph is from data received at the ECM so realistically either end could be the problem, most likely the sensor end, but without 'scoping the sensor output directly, it's still a 50-50 guess. |
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Post by remmington on Apr 12, 2023 6:28:04 GMT 1
Contact cleaner will probably make things worse.... great for deagreasing or removing tarnish, not so good for preventing contact fretting. You could try some dielectric grease to stop the contacts moving around - Nyogel 760G is the stuff JLR supply, realistically you'd be better off finding the connector housing & contacts on www.auto-click.co.uk/ (assuming it's the sensor connector contacts that are baggy) - the graph is from data received at the ECM so realistically either end could be the problem, most likely the sensor end, but without 'scoping the sensor output directly, it's still a 50-50 guess. +1 for this lot. |
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Post by Rhubarb on Apr 12, 2023 7:43:51 GMT 1
You sure this thing isn't just throwing up codes due to the previous weak/knackered battery? As it's performing as it should since you've fitted a new one  |
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Post by studabear on Apr 12, 2023 11:32:10 GMT 1
You sure this thing isn't just throwing up codes due to the previous weak/knackered battery? As it's performing as it should since you've fitted a new one This is what we are hoping, he reported back this morning all is good, even switching itself off in traffic etc now. |
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Post by studabear on Apr 17, 2023 19:21:48 GMT 1
No such luck, it's gone wrong again today, so looks like I need to try a new plug on cam sensor next. Ideally scan it again first as I need to go and get a pic of the plug etc maybe take some measurements.
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Post by studabear on Apr 22, 2023 9:48:33 GMT 1
Bought a pre wired plug for this, soldered it onto the loom this morning using the heat shrink solder sleeves.
Fault still present, same 2 fault codes keep coming back.
It's going to the dealers next.
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Post by rhyds on Apr 22, 2023 17:35:51 GMT 1
Bought a pre wired plug for this, soldered it onto the loom this morning using the heat shrink solder sleeves. Fault still present, same 2 fault codes keep coming back. It's going to the dealers next. You can do no more chief. At least you've eliminated the basic issues |
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Post by remmington on Apr 22, 2023 17:42:56 GMT 1
Bought a pre wired plug for this, soldered it onto the loom this morning using the heat shrink solder sleeves. Fault still present, same 2 fault codes keep coming back. It's going to the dealers next. You can do no more chief. At least you've eliminated the basic issues Is this a later 3pot H5 engine? If so - I would think the camchain is expiring!  --------- Not had anything to do with the 3cyl ones myself (thank God!) |
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Post by studabear on Apr 22, 2023 18:21:13 GMT 1
H4B400 is the engine code listed on E3 technical.
I know timing chains are crap but I would expect one to last more than 15k
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Post by remmington on Apr 23, 2023 6:58:13 GMT 1
H4B400 is the engine code listed on E3 technical. I know timing chains are crap but I would expect one to last more than 15k I too would expect the timing chain to last more than 15k. I not even serviced one of these - 3cyl engines - never touched one mate (bet now you wish you had'nt). |
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