Has anyone had any problems with the bosch +4 plugs? when im driving now, and im crusing at 45 in OD... if i have my foot on the gas just enough to maintain speed, it feels like the car jerks backwards, and sometimes it does it alot sometimes it doesnt... has anyone had this problem? should i just go back to double platinum?

 

No suggestions?

 

Check the gap on the plugs to make sure it is where it should be. The owner's manual tells you what that is. If that isn't the problem, you may have some issues with your fuel delivery, try an injector cleaner and see if that helps.

 

I was told not to gap the +4's because they dont need to be gapped. I ran fuel injector cleaner throughout about 3 weeks ago. Could it be a burnt cylinder head? According to my g/f, she put injector cleaner in with a damn near empty tank. What would this do for the engine? thats why she is always a passenger now.

 

My bad, yeah, those plugs can't be gapped, duh. I'm not sure what it could be, running the injector cleaner through with not much gas wouldn't cause the problem. You may have to take it in unless someone else in here can chime in with an idea. In any case, good luck.

 

thanks.. does this happen to sound like a problem with the filter or maybe an injector?

 

For years there have been threads about how horrible bosch plugs are for our cars, do a search and you will find that you paid for garbage plugs. There have been countless posts about misfiring (which is probably what you experianced. IMO if your car isnt heavily modded I'd go with motorcraft FTW!

 

thanks alot. motorcraft here i come