Knock sensor?
Thread Starter
Intermediate
Joined: Sep 2006
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From: Harlington Bedfordshire
Knock sensor?
I have just acquired a nice 95 C4 black on black convertible here in England, low mileage (35,000) and therefore possible suffering from lack of use. As a result I am still getting used to it. Please forgive any repetition of previous postings for the following.....
When travelling 50-70mph up a gentle incline and with the gearbox in overdrive, if you accelerate quickly then there is a down shift and all is OK. But if you accelerate gently there is a sound that to me is like pre-ignition (pinging I think you call it). I suspect the knock-sensor may be a little tired. Any experience of this over there or should I just drive it harder?
Advice would be much appreciated.
When travelling 50-70mph up a gentle incline and with the gearbox in overdrive, if you accelerate quickly then there is a down shift and all is OK. But if you accelerate gently there is a sound that to me is like pre-ignition (pinging I think you call it). I suspect the knock-sensor may be a little tired. Any experience of this over there or should I just drive it harder?
Advice would be much appreciated.
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Joined: Oct 2000
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From: Fort Knox, KY
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Are you getting any codes stored in your ECM? Does your SES light come on at start-up or during the pinging episodes?
If you're getting Code 43, that tells me something is amiss with the knock sensor circuit.
Do you have the Helm Factory Service Manual? Get it. It will help a ton.
If you're getting Code 43, that tells me something is amiss with the knock sensor circuit.
Do you have the Helm Factory Service Manual? Get it. It will help a ton.
Team Owner
Joined: Oct 2000
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From: Fort Knox, KY
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Originally Posted by grahamecooper
Many thanks. Will get the manual and get my friendly mechanic to check the codes.
C4 Guru - Reading CCM Codes. http://www.c4guru.com/articles/CCMCodePull.pdf
Team Owner
Joined: Oct 2000
Posts: 96,443
Likes: 9
From: Fort Knox, KY
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Originally Posted by grahamecooper
Wow! I had no idea that this facility existed. Still learning, as I have only had the car a month.
Many Thanks
Many Thanks
