toms03cobra Posted March 21, 2009 Report Share Posted March 21, 2009 ok i have a problem with a 97 blazer, it shuts off at an idle when it gets above 50 degrees outside, if you can get it moving it runs fine, when it shuts off the fuel pump whines really loud, but the pump is new, we thought it was a oil pressure switch because the pressure bounces when it shuts off, and we already replaced the fuel pump solenoid any ideas?!?! Quote Link to comment Share on other sites More sharing options...
Dave1647545494 Posted March 21, 2009 Report Share Posted March 21, 2009 check fuel pressure and report back this is also in the wrong section Quote Link to comment Share on other sites More sharing options...
Guest Removed Posted March 23, 2009 Report Share Posted March 23, 2009 check engine light on? should check for history codes Quote Link to comment Share on other sites More sharing options...
toms03cobra Posted March 23, 2009 Author Report Share Posted March 23, 2009 no codes and no engine lights, and dont have a way to check fuel pressure right now Quote Link to comment Share on other sites More sharing options...
Guest Removed Posted March 23, 2009 Report Share Posted March 23, 2009 does the idle seem low? im wondering if the fuel lines inside the intake are leaking..or the regulator Quote Link to comment Share on other sites More sharing options...
toms03cobra Posted March 23, 2009 Author Report Share Posted March 23, 2009 no, and it only does it after it sits at idle in drive on a warmer day like 10 minutes or more, were thinking of just bipassing the pump wiring and hard wiring it to the ignition Quote Link to comment Share on other sites More sharing options...
Guest Removed Posted March 23, 2009 Report Share Posted March 23, 2009 no, and it only does it after it sits at idle in drive on a warmer day like 10 minutes or more, were thinking of just bipassing the pump wiring and hard wiring it to the ignition thats not going to change anything. and now your just guessing at stuff... need to check it out properly... Quote Link to comment Share on other sites More sharing options...
toms03cobra Posted March 23, 2009 Author Report Share Posted March 23, 2009 we just cant figure it out and its been doin it for a long time its gettin old you can run it all day long in the winter it only does it when it gets up above 50 or so Quote Link to comment Share on other sites More sharing options...
Guest Removed Posted March 23, 2009 Report Share Posted March 23, 2009 sounds like its leaning out.... may just be time to drop it off to someone.. Quote Link to comment Share on other sites More sharing options...
toms03cobra Posted March 23, 2009 Author Report Share Posted March 23, 2009 why would it not show codes if it was leaning out, and why would the pump sound like its whining really loud, and why would it run after you get it going down the road? im just puzzled Quote Link to comment Share on other sites More sharing options...
Guest Removed Posted March 23, 2009 Report Share Posted March 23, 2009 have you tired to read codes with a good scan tool? read the data stream at idle and see if all the sensors are readin right. gm pumps whine. especially cheap replacement pumps you have a lack of idle. not going to affect the way it drives almost seems like the IAC is dirty, or not moving.. have you tryed that? this is what we in the industry call no code driveability issue. Quote Link to comment Share on other sites More sharing options...
toms03cobra Posted March 23, 2009 Author Report Share Posted March 23, 2009 i know they wine at idle, it wines extremely loud when it acts up, almost like the pump is getting a load on it, ill try to get ahold of a better scan tool, and thanks for the iac ill try it, but its weird, even when i get it to start it stutters like its starving for fuel and hitting the gas doesnt really do anything unless it gets up in rpm's, you know anywhere where i can get ahold of use of a good scan tool? thanks Quote Link to comment Share on other sites More sharing options...
Guest Removed Posted March 23, 2009 Report Share Posted March 23, 2009 fuel pressure test...you need to know what it is. period. those are bad about the regulator leaking under the intake, and if thats the one where the fuel lines go into thew lower, they are know to leak there. as far as the pump getting louder when it dies, of course it will...its still pumping the same amount of fuel, but the engine isnt using it. its just deadheading at that point Quote Link to comment Share on other sites More sharing options...
351mach11647545510 Posted March 24, 2009 Report Share Posted March 24, 2009 get a 5 gallon container and fill with gas (gas is cheap right now so shouldnt be a problem, especially if it fixes your problem.) pick up a pack of hot dogs as well as hershey bars, marshmallows and graham crackers. cover interior with contents of 5 gallon container, light match, roast hot dogs and make smores. profit Quote Link to comment Share on other sites More sharing options...
Guest Removed Posted March 24, 2009 Report Share Posted March 24, 2009 and sadly, i agree with him. his was a pos too. Quote Link to comment Share on other sites More sharing options...
xlr8tn Posted March 25, 2009 Report Share Posted March 25, 2009 you can maybe look into the throttle body with a flashlight and see if the intake walls are washed down with fuel. Those spiders are notorious for leaking. I agree with gearhead though, fuel pressure is the first thing you need to check. The stock pump in my 97 highrider sounded like another engine running back there. They're just loud. Have you fixed the intake leak on it yet? Pretty much all the intakes leak too at some point. Quote Link to comment Share on other sites More sharing options...
appn88 Posted April 1, 2009 Report Share Posted April 1, 2009 well this was my truck tom posted it for me, it got sold today, so no more worries:D Quote Link to comment Share on other sites More sharing options...
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