Quote:
Originally Posted by smurchill
Just as an update, I ordered Bosch ZR5TPP330A from FCP Euro, but received ZR5TPP330 (no A suffix). I tried searching for what the A suffix means, but couldn't find anything. There is a PDF on Bosch's site here: https://www.boschautoparts.com/en/au...gs?partId=8165 (titled Spark Plug Number System or Design Codes), but no indication of what that last 'A' might stand for. I'm assuming it is some sort of revision but based on the same design/specifications. I saw a previous comment where you mentioned a TSB about cracking and the only thing I could find was TSB SI B12 25 14, which defines switching from Bosch ZR5TPP339 to Bosch ZR5TPP330A to solve a cracked insulator issue.
I can search ZR5TPP330A images and see the 'A' stamped on the plug itself, but mine do not. The boxes also looked pretty old and beat up, which leads me to believe they were old stock.
Another interesting point is the box is labeled with a 0.032" gap and I believe OE is 0.028".
Anyway, I am returning them and I think I'm either going to order the genuine BMW replacements from FCP (because of their lifetime replacement program, I can spend the OEM money once and keep replacing them) or just order the ZR5TPP330A from somewhere else and see how they turn out. |
That's weird I think FCP messed up and sent you the wrong boxes, reach out to them and see what is up.
Also the bosch plugs should be pregapped to 0.028" (but if this is not the case then I am mistaken) but if not then you will have to manually gap them down yourself.