Spark Plug Gap Stock E28 M5?

Specific conversations and info for the BMW E28 M5 and M535i.
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Syndrome
Posts: 128
Joined: Nov 23, 2021 3:46 PM
Location: DC

Spark Plug Gap Stock E28 M5?

Post by Syndrome »

Hello all. Sorry to ask a really basic question, but using the stock Bosch plugs in a stock S38B35 engine, what is the proper gap for the spark plug electrode? Thank you!
tylerrose
Posts: 23
Joined: Sep 27, 2020 8:18 PM
Location: Los Angeles, CA

Re: Spark Plug Gap Stock E28 M5?

Post by tylerrose »

0.6-0.7mm
Syndrome
Posts: 128
Joined: Nov 23, 2021 3:46 PM
Location: DC

Re: Spark Plug Gap Stock E28 M5?

Post by Syndrome »

Thanks. That also works out to .024 to 028 inches for the “metric averse” of the world. I not only gapped the Bosch plugs to these specs, bit I also found a crack in the rubber boot from the intake to the MAF, which was really messing with the car’s running. I ordered a new one and taped up the torn one with Gorilla tape until it arrives. All of a sudden, the car started running “more properly”. Sill not great, but a massive stride forward. Thank you.
tylerrose
Posts: 23
Joined: Sep 27, 2020 8:18 PM
Location: Los Angeles, CA

Re: Spark Plug Gap Stock E28 M5?

Post by tylerrose »

No problem - best of luck sorting it out.
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