Could someone please let me know what the exact correct plugs are for my car? I've tried searching for Rover 45 1.6L plugs and so many types and variants are displayed. I've just started having issues with intermittent misfire. I changed the plugs earlier in the year, I fear I may have the wrong ones - NGK3546.
Thanks,
Paul
Spark Plugs - Rover 45 1.6L (16K4) 2001
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StubbornPatriot
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Re: Spark Plugs - Rover 45 1.6L (16K4) 2001
So, 3546 appears to be the part number for PFR6N-11. According to Motaclan this is the correct plug for your car.
As you say, there's a lot of different references for the plugs and it is a bit of a minefield.
According to the HWM - Bosch FR 7 D+, or equivalent. NGK 3783, NGK BCPR6ES, NGK BKR6E, NGK BKR6ES and NGK BKT6EZ. Champion RC9YC. It's an old HWM, so it's probable many of these have been superseded. I can't be sure how accurate these cross references are - they've come from a site on the net.
According to Rimmer Bros - NLP000040, or equivalent. Possibly Champion RC9YCC.
Perhaps someone who owns a similar 45 could check their car and tell you what is fitted.
I suspect your intermittent miss-fire is coming from some other source.
As you say, there's a lot of different references for the plugs and it is a bit of a minefield.
According to the HWM - Bosch FR 7 D+, or equivalent. NGK 3783, NGK BCPR6ES, NGK BKR6E, NGK BKR6ES and NGK BKT6EZ. Champion RC9YC. It's an old HWM, so it's probable many of these have been superseded. I can't be sure how accurate these cross references are - they've come from a site on the net.
According to Rimmer Bros - NLP000040, or equivalent. Possibly Champion RC9YCC.
Perhaps someone who owns a similar 45 could check their car and tell you what is fitted.
I suspect your intermittent miss-fire is coming from some other source.
1989 216GSI + 1990 216GSI + 1997 416 Tourer + ? + Triumph T160V
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itcaptainslow
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Re: Spark Plugs - Rover 45 1.6L (16K4) 2001
Rover part number for the plugs for your 45 is NLP100290, assuming it doesn't have an LPG conversion! NGK equivalent lists as PFR6N-11.
Re: Spark Plugs - Rover 45 1.6L (16K4) 2001
Thank you, both replies have been very useful. I will look into this now with a better understanding of what are suitable plugs.
I found the source of the misfire. There was a hard white coke surrounding the pointed centre electrode on the fairly new iridium plugs, on cylinders 1 and 2 only. After carefully chipping away the coke, the car runs fine.
I found the source of the misfire. There was a hard white coke surrounding the pointed centre electrode on the fairly new iridium plugs, on cylinders 1 and 2 only. After carefully chipping away the coke, the car runs fine.
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itcaptainslow
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Re: Spark Plugs - Rover 45 1.6L (16K4) 2001
I’d investigate further. That’s a symptom of the engine running lean (although odd on two cylinders only) - it could also be evidence of coolant getting into those two cylinders.
Re: Spark Plugs - Rover 45 1.6L (16K4) 2001
I take your point about coolant entering the cylinders. I suspect not because, 1) I changed the head gasket for a multi-plate gasket in 2020, because coolant was getting into the oil/sump with the original Rover gasket, and 2) I haven't needed to top up the coolant this year.
Also I do a lot of motorway miles and no shorts trips, which would show a light colouring of the plugs any way (perhaps not white though).
However, what I have noticed is that the rocker cover breather pipe connects to the inlet manifold exactly between (and opposite) cylinders 1 and 2 inlet ports. The same two plugs which have a noticeable build up of hard coke. I'm of the opinion that these two cylinders are getting a higher proportion of crank case oil fumes, and burning off the oil vapour is leaving mineral deposits on those two plugs. Could this be a possible cause for the enhanced build up of coke on these two plugs compared with cylinders 3 and 4? I would be happy to hear your thoughts.
Also I do a lot of motorway miles and no shorts trips, which would show a light colouring of the plugs any way (perhaps not white though).
However, what I have noticed is that the rocker cover breather pipe connects to the inlet manifold exactly between (and opposite) cylinders 1 and 2 inlet ports. The same two plugs which have a noticeable build up of hard coke. I'm of the opinion that these two cylinders are getting a higher proportion of crank case oil fumes, and burning off the oil vapour is leaving mineral deposits on those two plugs. Could this be a possible cause for the enhanced build up of coke on these two plugs compared with cylinders 3 and 4? I would be happy to hear your thoughts.
