I know its a lot to read but its all the info I can think of right now....

Okay so sometimes my truck acts like it doesn't want to start. (its not the PATS)

I can turn the key and hear it turn over as long as im trying to start it. and at the same time i can smell fuel.

I noticed that if i start the truck and rev it or anything without actually going anywhere. turn off truck and then later on try to start it this will happen.

We'll today I replaced my wideband sensor. started truck just fine.. noticed the wideband responded properly now. turned off truck and went inside for about 2 hours.

came back out tried to start the truck and it wouldn't start until i pumped the gas pedal one time while trying to start it. then it started right up and a black puff of smoke came out the exhaust tips.

Heres what scares me. when i start my truck after its been sitting.. its loud....thats the normal part.

we'll its not loud right now... it sounds like its warmed up like its been running all day. sounds normal....

I know i have an exhaust leak before the turbo but its not a big one.. I'm still making 8psi just fine. but at wot it doesn't feel so WOT'ish...
*edit*
actually, the exhaust leak may be big enough to affect my boost because i dont actually make boost as fast as i normally do. and of course it never pulled hard until after 4-5 psi anyway...

i just hope its not time for a rebuild already its only been turbo'd for about a month.

guess ill be doing a compression check tuesday and buying a new car thursday. (sorta joking about the new car but sorta not)

8psi stock block 275rwhp 338rwtq.

oh and im not losing coolant and there is no gas in the oil, atleast that i can smell or anything.

once its started it runs fine.

havent changed the plugs ever since it was dynotuned. its possible that they are fouled up pretty good. i know my wideband sensor was fouled up horribly.

before i got dynotuned i had a base tune one time that was so rich.. that it would die.

so after it would die.. when id try to start it .. it would do exactly what its doing now.. however all that was resolved. but ive had a few dyno tuning sessions since then and have yet to put in some new plugs.

anyway like i said this hardly happens but i kind of know how to make it happen.

ive been googling all night what compression issues do and cant find anyone having the same problem im having, everything i find with the same symptoms seems to be fuel related or tune related with the same issues.

oh yeah btw.. THIS is something that has happened ever since tuning.

Maybe its possible that its tune related and that the pcm/ecu whatever is acting like the truck is already running while the truck starts? open loop or whatever while starting causing it to flood the spark plugs?

 

Pull a couple of the plugs and see what they look like....It sounds like a fuel issue...too rich.......putting the pedal to the floor is getting the extra air in to clear the flood condition it sounds like....why it's doing that is another issue in itself.....What about whoever is doing the tuning, can't they help you out?

Are you running stock injectors? How about the regulator, any mods there?

You might want to send this over to the Aftermarket Superchargers/Turbochargers forum...there might be some better help over there.....

 

thank you for the response. im running 39lb injectors, sounds like a fuel issue to me too im glad you didnt say 'sounds like a compression issue' lol thats been my fear all night.... but on every forum ive posted on thats NOT been anything anyones thought it might be.

the reason why im so concerned with compression is because well... id be in a big hole financially and cannot afford a rebuild or replacement motor at the moment. and i dont know how a vehicle acts when it comes to low compression or anything.

 

I'm confused .

 

39's are from the cobra

cold start - starts fine

warm start - fine depending on if its been driven or not.

if its been started and running/idling in the driveway then i turn it off and come back later to go somewhere it may not start. keeps turnin over and i can smell lots of fuel.

there are no check engine lights and the truck is fine once its running. i can prevent this as long as i actually drive it. the other day i started i tjust to move it down the drive way. that was enough to screw up the next time i had to start it.

im starting to feel this is a tuning issue..

 

24's

 

Honestly I think those 39lb injectors are overkill for your application and may be giving you some trouble too...from what I've read they were more for 450hp+/16PSI+applications....maybe stepping down to a smaller injector...like the 24's Jbrew mentioned and re-tuning might be a better choice....I know from my 5.0 days that the 24's were always a good choice for the mild street applicatons. I don't know much about who did your original tune but it sounds to me like they left you hanging a bit......

 

eh, i know a lot of v6 turbo guys with 42lb injectors.

i also know i have an exhaust leak before the turbo. so that is effecting somehting too, i had a HUGE exhaust leak the other day and truck felt powerless. after i fixed it up (which now its back but not near as big) the power came back.

these little v6's seem to require some good backpressure inorder to get off the line.

 

275hp, 8psi and and 39lbs do not match....there are several formulas available for injector selection...

Fuel injector size = (275 hp x 0.55) / (8 x 0.80) = 23.6 lbs./hr

Hp is well...HP....... .55 is the Brake Specific Fuel Consumption .5 to .6 for low compression motors on gas.....8 is the number of cylinders, .80 is the duty cycle limit of the injector.....

 

but what about for the v6?

i figure with 39lb injectors that just gives me good room to grow

and 275hp is like 220rwhp... im at 275RWHP not 275 at the motor. if we were to say that thers an 18-20% loss from motor to wheels, then that would be about 325HP at the motor.

http://i124.photobucket.com/albums/p...dynograph2.jpg

 

Well let's back up a few then...exactly what motor do you have? I must have missed out on that????? Even a V6 only comes up with about 32lbs.....even so turbo efficiency, engine efficiancy etc.. all come into play...please dear God tell me you didn't turbo a 4.2?

 

ieyiyiyii !! - yea, disregard my past posts , nevermind , I'll get it...

good luck w/this one FT

 

Thanks for the backup there Jbrew......

 

lol

yes.. i turbo'd a 2003 4.2l v6

 

Holy hell you're sitting on a bomb dude!

Nah just kidding....
If you have 325 at the crank then you are within reason I would say...sorry I assumed V8 and went off the numbers you posted...I'd try v6150.com or maybe v6power.net
they might be a little better help....I still think it sounds like a fuel issue, having a boost leak is not helping but i wouldn't think that would affect startup that much since you shouldn't be building any boost at idle to speak of.....

325 out of a 4.2 is pretty impressive.....