pulsating idle

cstmcool · Post by **cstmcool** » 27 Oct 2010, 21:49

gotta 97 850 non-turbo that has blown three return fuel lines right between the fuel rail and pressure regulator in about a month after i repaced the line the last time i have been getting a pulsing at idle when i rev upthe rpm's it goes away.Need some help i have changed the mass air flow sensor and still got the same pulsing

Post by **phils94850** » 28 Oct 2010, 01:43

check your fuel press and see exactly what its doing. It sounds like when its idleing its building up the fuel press. to high and when you rev the engine its able to get rid of the extra fuel/press..

If its blowing the return hoses you could have a bad fuel pressure regulator or a blockage from the return line back to the tank. I would say bad FPR though.

Post by **jblackburn** » 28 Oct 2010, 06:01

I would say bad FPR though.

Agreed.