Posted by 2002sliverado on March 23, 2018 at 06:35:30 from (216.16.75.34):
In Reply to: Gas mileage & plugs posted by 550Doug on March 23, 2018 at 04:55:11:
I have had 2 3800 V6 engines in cars and still have 2 of those engines. My parents have had 2. Your question has me wondering if your mileage is suffering, and you are wondering if changing plugs will make an improvement. If everything else is functioning properly, an improvement is probably going to be rather minimal. As one suggested, maybe a couple miles per gallon is about all you are likely to find. On a 2000 Park Avenue of ours, and on a 2000 LeSabre of my parents' car, we noticed a distinct drop in fuel economy. In both cases we found it be a bad fuel pressure regulator. Once replaced, all was fine. As I recall, there was no noticeable issue in how the engine started or ran. It was just a matter of poor fuel economy, and it was something on the order of around 8 miles per gallon. One comment I have heard about these engines, is the coil packs can start to fail if your are running on old, worn out plugs. I have never had that experience, but it is something I have had a few people share with me. The only vehicle I ever suspected I had an improvement in fuel economy with a plug replacement was a 1998 Dodge Ram truck with a 5.9 liter V8 engine.
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