bmw_e30 Posted August 24, 2022 Share Posted August 24, 2022 (edited) did a "tuneup" a few weeks ago with new plugs/cap/rotor/fuel filter/coil but didn't set the dwell or check the valves as both are pretty spot on still. turned car and after all parts installed and ran a bit rough and bogged down at anything past 4k but i thought i was imagining things. drove the car a few days ago and bogging down/ahrd starting/rough running all still there. checked the entire fuel system first from back to front all looked clean so i knew the junk russian made bosch wr7dc+ plugs were the next step. i pulled my last plugs and installed them which are ngk bp6 about 8 years old with 10k miles on them problem solved right away moral of story always use the highest quality japanese parts in your 2002 it will run like a toyota/honda/mazda but drive like a bmw Edited August 24, 2022 by bmw_e30 1 Quote Link to comment Share on other sites More sharing options...
Son of Marty Posted August 24, 2022 Share Posted August 24, 2022 (edited) In no way am I defending Bosch and their off shore junk, but did you gap the plugs before installing them? Edited August 24, 2022 by Son of Marty Quote Link to comment Share on other sites More sharing options...
tzei Posted August 24, 2022 Share Posted August 24, 2022 Bosch plugs needs to be ”made in germany”. Anything else is junk. 3 Quote Link to comment Share on other sites More sharing options...
Mike Self Posted August 24, 2022 Share Posted August 24, 2022 After nearly 30 years of using Bosch plugs (when they were only made in Germany) I swore 'em off after a dead plug fresh out of the box; the same reason I switched to Bosch from Champion back in the 70s. NGKs work just fine... mike Quote Link to comment Share on other sites More sharing options...
Lorin Posted August 24, 2022 Share Posted August 24, 2022 NGK all day. 2 Quote Link to comment Share on other sites More sharing options...
Son of Marty Posted August 24, 2022 Share Posted August 24, 2022 That's funny Mike, the only dead from the box plug I've ever had was a NGK so it happens to all manufactures, I've also gone to Champion plugs. Quote Link to comment Share on other sites More sharing options...
TobyB Posted August 24, 2022 Share Posted August 24, 2022 It also might be a letter in the part number- wr7dc+ looks like it has a resistor in it. ngk bp6 does not. If you have resistor wires, a resistor rotor, a blue coil, a ballast resistor, or any particularly high- impedance combination of the above, you'll get high- speed blowout and misfires at high speed. I'm not defending the Botch plugs- the generation that broke off in the head cured me of any need to run them. And NGK has apparently discontinued the non- resistor - It should also be a bp6es, 'extended tip' plug... t plugless. 2 Quote Link to comment Share on other sites More sharing options...
bmw_e30 Posted August 25, 2022 Author Share Posted August 25, 2022 On 8/24/2022 at 11:57 AM, Son of Marty said: In no way am I defending Bosch and their off shore junk, but did you gap the plugs before installing them? i did gap them to .032 when i installed them but when I measured them today they were closer to .028 that explains partly why they were sucking since my car likes them at around .032 Quote Link to comment Share on other sites More sharing options...
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