Truck trouble starting

Truck out of no were it had trouble starting had to turn the key 2 full times and when it it did start it had trouble turning on

 

3.4L ? Had this happen to me a few times over the years. I can't remember the possible issues that can cause it. What is your mileage? Fuel filter, air filter , spark plugs up to date? Have you cleaned MAF lately? If all good there. Might be good time to reset ECU. Oh, if it continues coould be weak fuel pump.

 

Please add more details.

How long was the truck sitting before starting?

Does it turn over normal like you recall?.

What engine/transmission?

Did this ever occur in the past?

 

It sat for like 2 hrs before I tried to start it up I just good work and was going to go to the store . This is the first time it did this other then couple days ago it started hard and threw white smoke and smelt burnt but since then it hasn't don't it again .it's a v6 auto 2004 double cab 142000 miles

 

It sat for like 2 hrs before I tried to start it up I just good work and was going to go to the store . This is the first time it did this other then couple days ago it started hard and threw white smoke and smelt burnt but since then it hasn't don't it again .it's a v6 auto 2004 double cab 142000 miles

 

timing belt ever done?

 

Yes at 113000 miles it's at 142000 now

 

Depends on what sounds it makes when you try to start it

 

Burnt smell? are you referring to oil? There is something you do with gas pedal too. You press it 100 times. I can't remember if you have the key in the" on " position or not. That is suppose to clean or reset something with the fuel system. koditten might be able to clarify. He is pretty knowledgeable.

 

Well sound normal when I turn the key just take 2 full 5 seconds turns to start it then it starts itsounds like it struggles at first then it sounds okay first time this happend

 

Yes burn couple days ago I started it up and it kinda struggles and then threw a puff of white smoke and it smelled burnt I know my valve cover gasket it leaking oil could that be it also I ads marvel mystery oil even fill up in tank

 

I'm wondering if you have leakybfuel injectors.

You said it was sitting for a while, then it struggled to start. That is a symptom of bad injectors.

 

I have 154k on my 03 and my valve covers need replaced too But I keep everything else in top order. Just replaced factory exhaust, catback last year and installed new O2 sensor and A/F sensor Truck runs like it did new. Oh, I read somewhere Marvel mystery oil is hard on catalytic converters. I believe in that stuff and use it on my lawn equipment only now.
If all the stuff I mentioned is in good order? I would try and reset your ECU and look up the gas pedal procedure. It's on here somewhere.

 

Good point kod! I didn't think about that. That is or can be an issue with the 3.4. I have been lucky so far.

 

Oh, possible vacuum leak can cause that too if I am correct?

 

One more thought. Clean throttle body lately?

 

It only sat for 2 hrs

 

Does it start good 1st thing in the morning?

 

Sounds like a bad head gasket. I've been through three.

 

Are you serious? How many miles on your engine?