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Re: 2003 chevy suburban keeps dying
Check Fuel filter change if it hasn,t been changein a while also check fuel pump relay may be bad (clicking on and off )therefore shutting pump down. If all is well with above items. then the camshaft position(this provides reference for injector pulse) sensor may be at fault. Good Luck, contact if you need more help.
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If you feel like the engine is still ok, I would look at the oil pressure and check engine light issues. On engines with fuel injection, the fuel pump is powered by the pump relay until the engine starts. Then the engine has to have oil pressure to keep the fuel pump powered. Its a safety feature so if you are in a wreck the fuel pump does not keep running if the engine is off. I would want to know why the oil pressure light is staying on and what the trouble codes are in the computer.
check the fule presure on the injector rail is a what looks like a car tyre valve connect a gauge up to this or buy one ,i use a old AC filler pipe for one of them gas can things with the end changed to a tyre valve pump end and it works ok better than paying a lot of money for one ,should read 55lbs and if the pressure drops then suspect the gauze filter on the bottom of the pump first before you replace it as its a complete unit and around 600euros as its only available from the dealer
Assuming your engine is in good mechanical condition, there are only a few options.
1. You may have a vacuum leak. 2. The pickup in the distributor may be worn to the point that it is sloppy at idle but normal at higher rpm. 3. Idle control valve/motor may not be working properly.
It probably isn't an ignition related problem as the problem would normally get worse as RPM increases. I've seen #2 about 5 times in the past year or 2 so it's not uncommon and would recommend replacing the entire distributor if you come to that conclusion, but would definitely check all vacuum hoses first.
Does it gallop when you are sitting idle and the RMP gauge bounce up and down between 1000 and 1500? If so, clean the throttle body and see if that solves the problem. I had a similar problem with my 03 Yukon XL (same truck) and cleaning the throttle body fixed it.
Sounds like either Air mass sensor, Air mass meter or finally the EGR valve this is the exhaust gas recycler I would say that is the fault when they start to go this is what they do until finally the car will barely move.
Also I would check all your air pipes for leaks make sure there is no rips or tears in the pipes, The car will drive fine like you say until you ease of the gas to a stop position it **** in to much air and kills the engine. Air faults are cheaper so look there first.
have fuel pump pressure checked 50-60 Psi at idle 60PSI with vac line diconnected from pressure regulator. If that checks out check for ingation switch failier may be keeps car power on but telling ecm that it has been turned from run. Also have a wave form done on fuel pump as it can still have good pressure but not be fully funtional elctricly. if you have acsses to a tech 2 have it checked for codes as it may not have turned on the light but may have stored a code