Question about Bosch 1991 Alfa Romeo Spider Veloce 2.0L Alternator - Remanufactured - 65 Amps

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A Bosch Platinum spark plug disintegrate inside the combustion chamber.

This is my second set of Bosh Platinum +4 plugs. I bought the first set several years ago when they first came out and they worked great. Last month (November 2013) I tuned up my 1991 Alfa Romeo Spider Veloce and put a new set of Bosch Platinum +4 plugs in preparation for a trip to Arizona, about a 1,000 mile round trip. The car ran great and I averaged about 29 M/G. This Christmas I was about 55 miles from home on the I-15 which is a 70 MPH speed zone, I was going about 75 MPH, when my car suddenly lost power, but I was moving along good enough to make it to the next exit. After trying to figure out what the problem was, I decided to remove the spark plugs. When I removed the plug from cylinder #2, all of material of the plug which extends into the combustion chamber was gone. I got out my magnetic part pickup tool and put it into the plug hole in a effort to remove any fragments, after moving it around a little, the tool went down past the top of the piston, indicating that there was a hole in the piston. It cost me $320.00 to get towed home and I will have to totally rebuild the engine. Now that I see that another people are having problems with the Bosh Platinum +4 plugs, I think that Bosh should step-up-to-the-plate and take responsibility of this flaw in their product and reimburse us victims for our expenses.

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If the plugs were the correct heat range, and it only happened to one cylinder, you could bet the house on it being a over lean mixture on that cylinder.

Posted on Jun 23, 2015

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Sorry this is caused by a very lean running cylinder due to either
A) a vacuum leak
B) fuel delivery
C) exhaust leak
D) to much ethanol in fuel

Good luck...

Posted on Dec 28, 2013


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