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persistant pinging problems 700

posted by  fisher on  Fri May 23 01:16 CST 2003
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For the price of the FPR and the ease of replacement, I would just go ahead and plop in a new one. It is a lot easier then trying to diagnose it.

It is my speculation that the diaphragm in them starts to get hard as they get older. The hardness will result in less variance of fuel pressure so at idle it becomes rich and WOT it gets lean. Eventually the diaphragm will become brittle and crack resulting in fuel leaning into the vacuum hose at idle making a very poor running car.

Just my 2 cents. A new FPR for me in Canada was $67 and it took about 10 minutes to change. I ended up with much better performance, much better fuel economy (about 3-4 mpg better) and a lot less pinging. Although I have started to get pinging again with 87 octane so I went up to 89 and it is great now.

Did you buy new injectors or get your old ones rebuilt? How much did it cost?






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