Ok my 99 1500 5.9l truck, Dose not like to start, I have to push down the gas pedal and hold it and crank the truck for a few seconds for her to fire. Then the hole Truck shakes. But when I let go of the gas it will die. I have to keep on the gas and get the truck moving for the truck to stay running, And other time it will start like normal. with no problems.

Could this be a grounding problem or something else.

my family calls this a money pit, But I will never give
up on this truck!!!


Thanks everyone have a great day.


Everyone told me to replace my IAC sensor, Ive done this 4 Times in the last year, I dont think thats the Problem. I even bought the OEM Replacement form the dealer. Whats the next Step.

 

Check the connectors at the IAC, and at the PCM, make sure everything is clean and tight.

 

Could possibly be the Throttle Position Sensor.

Are there any codes?

 

Check for consistent spark

 

check your battery

 

when you replaced the IAC, did you clean the hole in the bottom of the well so air could pass into the TB? if not do so.

if you did, then replace tps.

 

After more thought on this, I would like to second the battery suggestion.

I had a Jeep Cherokee that wouldn't start unless I held the gas pedal to the floor, and then wouldn't stay running unless I feathered the throttle. Turns out the battery didn't have enough of a charge in it to supply the electronics with enough power.

I took the battery out, charged it, and put it back in. Problem solved. The reason it was down in the first place was an interior light had been left on all night.

Might be a good idea to check the charge on the battery. Disconnect the cables before checking it, as I read something recently in one of my classic truck magazines that leaving the cables connected won't give you a true reading of the voltage in the battery.

Also, check all of your grounds.

That's all I can think of at the moment. Hope this helps.

 

Generally unless a TPS really S*h*i*t*s the bed it won't throw a code and I've yet to see bad tps codes on a problem TPS vehicle I've worked on yet. My sisters 4.7 Durango TPS never threw a code despite being the problem for 300rpm tach jumps & engine surging. It can still be bad and not throw a code...I think its the TPS personally, this is the unsung problem sensor while many suspect the IAC, even though the TPS and IAC work together to make changes in idle.

 

new here i dont know how to get started.i have a 98 ram it idles rough & stall out. restart and it runs find for 2 days. can anyone please help. i changed spark plugs,pickup sensor,o2 sens,distrubator cap,rotor,ignition coil,iac,tbs & o2 sensor fuse,crankshift position sen. any thoghts

 

Generally, you should first use the search function and read the FAQs section. But if all else fails, start your own thread by selecting "Forum Tools" followed by "Post New Thread" But since you already asked the question...

I'd advise you test the fuel pressure, should hit right around 49psi
When you replaced the IAC, did you also clean the crap off the throttle body?
Make sure all the vacuum lines leading to the intake are in good shape (no cracks, dry rot, etc.)