Spark plug boot resistance

[guymandude]

I have an e36 1992 325i non vanos

My spark plug boots are in poor shape. The bottom of the boot is torn on a couple of them and some of them have had oil in the hole which has degraded the rubber.

I am trying to replace them as part of routine maintenance. I noticed them after replacing the valve cover gasket and spark plugs. The car runs fine but I don't like the look of the boots.

I have a set of boots for a 328 m52b28 but they are a couple mill shorter and they are 1.8kohm resistance. The 325 plug boots are 1kohm resistance.

I have tried to order another set for the 325 but when they showed up they were the 328 ones. I have been looking around at some retailers websites and some show the interchange as 325 and 328. Some show the interchange correctly but when I look up the 325 ones on those sites they still show boots with 1.8kohm resistance (after I chase down specs by googling the part numbers).


I have tried the 328 ones i had originally but the car had a slight hesitation or missfire at idle. I am assuming that by having a higher resistance than is designed for the corresponding ignition coil the spark would be weaker.

I have been able to find a good part number to replace the boots but the price is usually 20$+ each.

Can anyone confirm my assumption about the effect of the difference in resistance for the plug boots.

Also can anyone recommend a good part number that is confirmed to be 1kohm that is under 10$ each.

If not I guess I will have to wait and pony up the cash to replace the coils that will come with boots since the price will be not much more than just getting boots themselves from bmw.

[MarcoZandrini]

Go to www.realoem.com and enter the last 7 characters of the car’s VIN. Hit enter and bookmark the page. Scroll down to engine and get the part number for the coil boots. Then go to FCPEuro and buy original equipment (not BMW branded boots).

[guymandude]

I know how to use realoem

My last 7 fe60139 gives me the oem # 12131730521

Google that number and the only 3 parts that come up are genuine BMW (too expensive)
Beru W0133-1662267-BER or W0133-1633055-BER (i cannot find any specifications for either part # im guessing one is 1kohm and one is 1.8kohm and sunce both part #s are listed they sell them interchangably)
Bremi part #13249a1,8 on pelican parts it is listed with the correct interchange. M50 Screenshot_20180820-071521.pngScreenshot_20180820-071557.pngScreenshot_20180820-071711.png

Ok so i grab a m52 part number and look what comes up. Even the interchange says m52 only. Strange.
Screenshot_20180820-072652.pngScreenshot_20180820-072721.png

I am looking for a supplier part number that is confirmed to be the correct length and resistance

[ross1]

I have an e36 1992 325i non vanos

My spark plug boots are in poor shape. The bottom of the boot is torn on a couple of them and some of them have had oil in the hole which has degraded the rubber.

I am trying to replace them as part of routine maintenance. I noticed them after replacing the valve cover gasket and spark plugs. The car runs fine but I don't like the look of the boots.

I have a set of boots for a 328 m52b28 but they are a couple mill shorter and they are 1.8kohm resistance. The 325 plug boots are 1kohm resistance.

I have tried to order another set for the 325 but when they showed up they were the 328 ones. I have been looking around at some retailers websites and some show the interchange as 325 and 328. Some show the interchange correctly but when I look up the 325 ones on those sites they still show boots with 1.8kohm resistance (after I chase down specs by googling the part numbers).


I have tried the 328 ones i had originally but the car had a slight hesitation or missfire at idle. I am assuming that by having a higher resistance than is designed for the corresponding ignition coil the spark would be weaker.

I have been able to find a good part number to replace the boots but the price is usually 20$+ each.

Can anyone confirm my assumption about the effect of the difference in resistance for the plug boots.

Also can anyone recommend a good part number that is confirmed to be 1kohm that is under 10$ each.

If not I guess I will have to wait and pony up the cash to replace the coils that will come with boots since the price will be not much more than just getting boots themselves from bmw.

I could probably put together a set of used OE ones in good shape for you cheaply enough if it HAS to be the original # that you posted later.

[Breeze1]

I'd say leave them alone and replace with upgraded or OEM ones, in time. On a side note, the non-vanos M50B25 engine sounds nasty!