Over the years I’ve found that the factory recommended spark plugs typically work best. There are exceptions, but my ‘95 5.7 recently got some plain Jane ACDelco plugs and it is running great.
Pros: running great
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I like NGK’s. No longer have my E28 but in my 944 i still run NGK’s.
Pros: reliable, good performance
Vehicle:
Porsche
I suggest buying a known high quality replacement, not being picky about the exact spec, and seeing if that makes a difference. At under $5 it's a minimal cost and effort. Based on the what this engine was likely copied from, I would pick a NGK BPR4ES or BPR5ES from a vendor that doesn't have a reputation for NGK counterfeits.
Pros: high quality replacement
Cons: counterfeit risk
I removed the Champion plug and replaced it with an NGK and on the first pull it ran.
Pros: ran on first pull
Cons: did not start
I use NGK Iridium's in my generators. People say I'm nuts for spending the 10.00 for one, but I never have problems starting on gas or propane which is what I use with Iridium's, and plus you'll probably never have to replace it either.
Pros: never have problems starting
I just replaced the stock plug in my Champion inverter with a NGK and it runs significantly better. No more random misfires.
Pros: runs significantly better
Cons: random misfires
I threw the nasty plug away, installed the NGK plug and it now starts on the first pull and runs smoothly.
Pros: starts on first pull
Cons: required starting spray
Ja tive problema com velas bosch. NGK é melhor.
Pros: NGK é melhor
Cons: problema com velas
That's better than the Motorcraft plugs I received from Rockauto. They were bouncing around (no longer in their original little boxes) in a large shipping box with 2 sets of brake pads.
Cons: bouncing around in box
Autolites gotta be the worst fkn plugs on the market rn.
Cons: worst plugs on market
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