just keeps hesitating when warmed up
#1
just keeps hesitating when warmed up
I have a 1991 RS and starts up great, but when it warms up and closes loop if I give it the throttle the engine boggs down and wants to quit running. It does not show any codes and when I hook up a Vacuum guage to it, it holds a steady 20 on the guage. Need help figuring out what is causing this problem. Any ideas Please. Sorry I forgot to put in that it is a 305 TBI. By the mechanic of the previous owner it has had all new sensors placed on it and new fuel pump.
Last edited by Frank1Anderson; 11-15-2015 at 10:27 PM. Reason: left out engine displacement
#2
Join Date: Nov 2007
Location: Eastern PA,
Posts: 10,350
305 or 3.1? Based on what you typed it is either a flow issue or a timing issue. Flow could be limited air flow in, limited fuel flow in or limited exhaust out. Timing could be spark timing or valve timing
That covers a LOT of possible problem. Fuel pressure test might be the first thing I would do and exhaust back pressure next. If you have a scan tool you can check to see if the MAP and air temp sensors are reading right. Is this a engine with a MAF sensor?
That covers a LOT of possible problem. Fuel pressure test might be the first thing I would do and exhaust back pressure next. If you have a scan tool you can check to see if the MAP and air temp sensors are reading right. Is this a engine with a MAF sensor?
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