When I put gas into it, it starts hard, I have to hold my foot on the gas to keep it running, but after I run down the road with it, it starts fine everytime after that till I put gas into it again. I've replaced fuel filter, fuel purge valve,and the fuel relay.
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I'M GUESSING THAT THIS IS THE SAME TRUCK I JUST ANSWERED UNLESS GAS IS APPLIED DO YOU MEAN YOUR STEPPING ON THE GAS AND THE TRUCK WILL KEEP RUNNING THEN YOU TAKE YOUR FOOT OFF AND THE TRUCK DIES TILL YOU START IT AGAIN AND IT RUNS TILL YOU AGAIN TAKE YOUR FOOT OFF THE GAS OR ARE YOU POURING GAS INTO THE THROTTLE BODY TO KEEP IT RUNNING OR IS THE BATTERY DEAD EACH TIME YOU GET IT TO RUN THEN IT STALLS AND YOU HAVE TO JUMP START THE TRUCK WITH THE BATTERY CHARGER EACH TIME YOU TRY? PLEASE CALM DOWN AND BE AS SPECIFIC AS YOU CAN SO I MAY HELP YOU FIND WHATS WRONG I'M NOT STANDING NEXT TO YOU TO SEE IT FOR MYSELF YOU HAVE TO TELL ME WHICH CONDITION WE ARE TALKING ABOUT HERE STEPHEN
Sounds like too much fuel, could be a leaking injector, faulty pressure regulator, or blockage of air intake. Did you replace the injectors and pressure regulator when you worked on the throttle body ? Can you see normal fuel spray on both injectors when the engine is running ?
ok i have a 1998 durango with the 5.2L 318 engine. had trouble with a bad cell in my battery. I went out bought an optima red top battery for it 800cca. put it in and had same trouble. No start without putting foot on gas. wouldn't stay running without holding foot on gas. CPU has to relearn it's programming once you unplug it for long periods of time. mine was without power for about 2-3 weeks till i got new battery. Start with this.. first check under air filter make sure a squirrel hasn't made a mess under your air filter and it's clogging the air intake. Then pull off the lid to your injector cover ( the screw down lid coming from the air box ( with air filter in it) to "carb") make sure all your cables move freely. put that all back together and close hood. Start truck with foot slightly on gas pedal to get started. keep it at about 1k to 1500 rpm for about 1-2 minutes. Rev motor to about 2500rpm and let it die out if it will. Get out lock doors with key fob if you have it. if not make sure to lock doors. ( trust me it worked for me) let sit for 5 minutes. come back out and unlock door and relock door 3 times with fob ( if you have it ) or key if you don't have a fob. Then unlock it with the key and enter vehicle. Start truck as before and keep it around 1k to 1500 rpm again for about 30 seconds rev it up and should keep running. Mine did. I think the iac was stuck from sitting and has now since loosened up. Good luck hope ti works for you.
No if it starts but you have to keep your foot on the gas to keep it running and then it dies when you take your foot off the pedal the fuel pump is working otherwise no gas at all if it was not working the throttle position sensor is bad the contact in the sensor is worn out at idle spot but when you first star it the sensor is in a different position and with your foot on the gas you can keep it running right racing like a normal engine but if no gas peddle it won't run if you just turn the key to start like normal but there's also a possibility that the idle air control valve is shot to both are on the throttle body you can look at them at rockauto.Com I'm assuming that your using premium gas and your throttle body is clean if not clean it out and see what happens before you spend $$$ on parts and check all your vacuum lines
its very important that the throttle body especially around the throttle blade be spotless clean or they will stall every now and then. then progress to refuse to idle at all. take off the rubber air intake pipe from the top of throttle body [has 3 torqes screws] open throtle by hand and look for carbon/grease/soot etc were the throttle sits when closed. clean with toothbrush and some caeb cleaner get all black off and dont forget the blade, both sides and the edges. scrub then rinse with carb cleaner untill shiny.spray some cleaner in the hole that is on top off the body to. that is your idle air controll motor port.put back together.it will be hard to start at first so hold gas pedal half way down untill it starts then slowly [real slow] let foot off untill you are no longer pressing it. put in reverse and let it idle there a few seconds then do the same in drive. that should do it. sometimes it may stall a couple of times when driving dont hold foot on gas just let it die then restart this allows the computer to readjust its idle stratagee
Ck your exhaust pipe at rear of car noting any obnoxious smell like rottrn eggs. Hold a piece of paper, I use a dollar bill ,in in front of the exhaust. If it blows the paper gently, you have a catalyctic converter going or is bad. Will need replace if so.
This isn't answer but a couple of things to check or do. First has fuel filter been replaced? Start car and put it in gear. HOLD Brake and Give it gas while still holding brake hard!!!! Doess it buck or miss fire? You said it ran bad to highway. Explain Please !!! will answer after you reply.