rockfangd Posted September 9, 2021 Report Share Posted September 9, 2021 Hi All. I have been driving my Seville daily this year and occasionally notice a hiccup on startup. When you try to start the car it will chug like it is going to start. I let off the key but engine did not start. It then takes more than normal cranks to fire it. Sometimes it will almost pop through the intake when it happens. Once engine is running it runs flawless. Fuel is always non ethanol premium fuel. Fuel mileage is excellent at 22mpg. About 250 miles per week travel. Fuel pump and filter are fairly new. OE Delco units. I change the filter annually. Problem seems to occur after sitting for a few hours, but not when started in the morning (first start). I was leaning toward maybe fuel leaking down... Would I be in the right direction with the fuel pressure regulator? Or something else. I am sure this has been discussed. Thanks for reading Quote GM FAN FOREVER Nice, clean, luxury= fine automobile Link to comment Share on other sites More sharing options...
cdgrinci Posted September 9, 2021 Report Share Posted September 9, 2021 I had similar conditions, sporadically, on a 2000 Olds Intrigue; saw an occasional chuggle on startup. My problem was a failing crank position sensor. Never saw an engine code. Quote Chuck '19 CT6, '04 Bravada........but still lusting for that '69 Z-28 Link to comment Share on other sites More sharing options...
rockfangd Posted September 10, 2021 Author Report Share Posted September 10, 2021 Thank you for your input. I suppose a intermittent loss of crank signal could be a possibility Quote GM FAN FOREVER Nice, clean, luxury= fine automobile Link to comment Share on other sites More sharing options...
sonjaab Posted September 11, 2021 Report Share Posted September 11, 2021 Pull the FPR vac. hose after running. If wet with fuel its bad. DO NOT remove hose with car running! Quote 93 DeVille-13 Chevy Impala 72 GTO - 77 Triumph Bonneville 84 Z-28 Syracuse NY Link to comment Share on other sites More sharing options...
teamzr1 Posted September 23, 2021 Report Share Posted September 23, 2021 On 9/8/2021 at 8:56 PM, rockfangd said: Hi All. I have been driving my Seville daily this year and occasionally notice a hiccup on startup. When you try to start the car it will chug like it is going to start. I let off the key but engine did not start. It then takes more than normal cranks to fire it. Sometimes it will almost pop through the intake when it happens. Once engine is running it runs flawless. Fuel is always non ethanol premium fuel. Fuel mileage is excellent at 22mpg. About 250 miles per week travel. Fuel pump and filter are fairly new. OE Delco units. I change the filter annually. Problem seems to occur after sitting for a few hours, but not when started in the morning (first start). I was leaning toward maybe fuel leaking down... Would I be in the right direction with the fuel pressure regulator? Or something else. I am sure this has been discussed. Thanks for reading If having a fuel pressure regulator. If it has a vacuum hose, while at idle is take the hose off and see if any fuel comes out and regulator is leaking would need to be replaced Using a fuel pressure gauge connected to the test port of fuel rail see what the fuel pressure is with key on, engine off, should read at least 35 PSI Turn key off and see via that gauge if pressure holds or quickly bleeds down showing leak somewhere including fuel injector(s) Otherwise, need a full OBD-II scanner and see if the problem happens when the engine is in open or closed loop. If closed then look for how the fuel trims look, is MAP and MAF reporting correctly, etc Quote Link to comment Share on other sites More sharing options...
sonjaab Posted September 30, 2021 Report Share Posted September 30, 2021 DO NOT pull vac. hose off FPR while running! Will cause engine RUNAWAY ! Only pull off vac. hose after running to check for raw fuel in vac line. Quote 93 DeVille-13 Chevy Impala 72 GTO - 77 Triumph Bonneville 84 Z-28 Syracuse NY Link to comment Share on other sites More sharing options...
rockfangd Posted October 1, 2021 Author Report Share Posted October 1, 2021 lol. I haven't even had a chance to check it out yet. Maybe within a few weeks Quote GM FAN FOREVER Nice, clean, luxury= fine automobile Link to comment Share on other sites More sharing options...
sonjaab Posted October 1, 2021 Report Share Posted October 1, 2021 I have read about engine runaway warning in the GM truck forums when you disconnect the vac. line on the FPR so I figured it would apply to any other GM engine. Just a thought........... Quote 93 DeVille-13 Chevy Impala 72 GTO - 77 Triumph Bonneville 84 Z-28 Syracuse NY Link to comment Share on other sites More sharing options...
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