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tpulliam79 · 10-21-2008, 06:15 PM

well my mechanic brought my truck to the house and as he pulled in the radiator drain**** burst ( which he just put in) but says its nothing he did? anyways now im replacing the radiator and realizing I dont think I trust my mechanic anymore. he says the vacuum pressure at idle is 14 and should be 18 and says that the cause is the 78 small block"s cam being different. Chevy says that wouldn't affect it? also that it dumps fuel at idle because the vacuum pressure is off. he never did check the fuel pressure.. wow sorry to rant but I am freshout of ideas and needed to clear the head....does any of this make sense to anyone?....thanks again

sorry about the rant..... does 14 sound right for vacuum at idle? and if the cam is in some way messing with vacuum and causing too much fuel at idle could a custom tune do anything for me?

10-21-2008, 06:15 PM	#67
tpulliam79 Registered User Join Date: Sep 2008 Location: spokane valley, wa Age: 29 Posts: 283	Re: 1991 chevy 1500 5.7 tbi erratic idle well my mechanic brought my truck to the house and as he pulled in the radiator drain**** burst ( which he just put in) but says its nothing he did? anyways now im replacing the radiator and realizing I dont think I trust my mechanic anymore. he says the vacuum pressure at idle is 14 and should be 18 and says that the cause is the 78 small block"s cam being different. Chevy says that wouldn't affect it? also that it dumps fuel at idle because the vacuum pressure is off. he never did check the fuel pressure.. wow sorry to rant but I am freshout of ideas and needed to clear the head....does any of this make sense to anyone?....thanks again sorry about the rant..... does 14 sound right for vacuum at idle? and if the cam is in some way messing with vacuum and causing too much fuel at idle could a custom tune do anything for me? __________________ 1991 chevy 1500 ext. cab 5.7 TBI 1988 chevy reg. cab 5.7 TBI lifted 8" swampers ( GONE Wife made me sell it ) Last edited by tpulliam79; 10-21-2008 at 11:46 PM.