falling on face

BMFB

BMFB

Not to scale
well, got my first major issue, has a big problem with falling on its face at WOT, not immediately, and not all the time, but sporadically.

was told it only happened when it was on E, but i haven't had much of the same luck

when it does it lasts about half a second and then comes back sporadically, but usually when it happens i just let off.

it throws a check engine light that lasts about 15 seconds, then then goes away, and after it comes back from its half a second vacation nothing else bad is noticeable.

i replaced the fuel filter to no avail, im thinking a pump, or maybe a reg, but im not sure, thought i would ask here first

thanks guys!
 
dgoodhue

dgoodhue

BuSTeD 4.3
Re: falling on face

First these truck need a Half tank of gas to kkep from starving fuel on a boost launch. You could be running out of fuel, but to me it sounds like your overboosting. Do you have a stock chip? I would keep away from WOT until you get a scan tool and start diagnosing the problem.
 
BMFB

BMFB

Not to scale
Re: falling on face

well, right now it does have a full tank of gas, but i do know that the exhaust has been tampered with from stock, and is much more free flowing.

I have heard that this can cause the turbo to produce more that 15PSI of boost, and that a 2 bar MAP sensor is unable to understand such a thing, and can cause a lean running condition which is very dangerous.

does this OBDI vehicle store codes at all, i.e. can i just scan it and it will see a code history? or do i have to have a scanner on it and put it into a lean condition to see the problem?

thanks again
 
BMFB

BMFB

Not to scale
Re: falling on face

I looked into getting a three bar map chip, primary a so called 'ultimate 3 bar map chip' and it looks like it would do what i need it to, but i cant really find where to buy one, the site i looked at said that production had seized, but im sure there's a few of these things laying around somewhere. im not looking for all out performance, and its basically a stock truck, except the cats been gutted and im getting some boost spikes apparently, and my computer is shutting it down. If i could get around this, i would love to know how
 
Jimmy

Jimmy

Banned
Re: falling on face

Dude,where you live?

Maybe a local with Datamaster can help you out.

Please don't go WOT untill your trucks' issues are diagnosed and fixed.

One more spike,ping.or fuel cut might blow your truck up.
 
BMFB

BMFB

Not to scale
Re: falling on face

funny question, could there be an issue with my waistgate?
 
KDBL1TY

KDBL1TY

Member
Re: falling on face

No cat = overboost. Waste gate opens and closes by using the waste gate solenoid. You can check the lines for cracks , and wear.
 
BMFB

BMFB

Not to scale
Re: falling on face

i dont know how accurate the stock boost gauge is, but my truck pegs it quite a bit farther than the red line/ 15PSi mark, and it can do it pretty easly
 
BMFB

BMFB

Not to scale
Re: falling on face

as far as i can tell, its totally stock other than it has a 3 inch catback exhaust, and the cats been gutted
 
KDBL1TY

KDBL1TY

Member
Re: falling on face

These trucks are tempermental. Some folks can run without cats and no issues. Others cant. the more mods you have the harder it is to run without a cat.
 
BMFB

BMFB

Not to scale
Re: falling on face

so from what im seeing my best fix would be to either replace the cat, or buy a 3 bar map sensor and a chip?
 
KDBL1TY

KDBL1TY

Member
Re: falling on face

If you step down to 2.5 and run into a good turbo muffler this might solve your problem. You dont have any restrictions so its free flowing. You need a little back pressure in the pipe diameter or muffler.
 
T

turboj91

New member
Re: falling on face

WADR, time to read the site and learn about these trucks and what makes them tick (no pun intended). There are a bunch of things you are going to need to check and they are all basic things explained numerous times on the site. You could have a vac leak from your boost solenoid as that is the most common thing to cause overboost. Installing a 3 bar does not prevent overboost in your situation. It's not your 2 bar that is causing it. There is a safety feature that when you overboost, the truck shuts down (so to speak) and that is where you feel it fall in its face. It's trying to save itself. Sure a 2 bar does not read high boost pressures where a 3 bar can, but it's not your cure all. You have other issue(s). I have no idea what was done to your truck prior to your purchase. Read the site, read, read, read. Learn all the basics. Do the basic maintenance stuff and make sure everything is up to speed. Your save yourself an engine rebuild if your careful. Happy reading.
 
BMFB

BMFB

Not to scale
Re: falling on face

well, i went and figured out that it is a code 31, waist gate failure/overboost

so, im starting to dig into my truck and see whats going on, gonna look around the site and see what i do to test the waist gate
 
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