Someone please help...nothing but trouble...overboosting now

[snowmanx]

So I just got the fuel pressure regulator replaced, as it was shot, took it out today, and now I am over boosting. Couldn't' figure out why at 3/4-full throttle it was falling on its face. I look down, and my boost gauge is spiking past 16#.

I was only a couple of miles down the road, so back to the truck,,,again... I checked the lines, they all look good, I checked the wastegate to make sure it is not stuck, it was fine. I tried adjusting the boost adjuster and it did nothing.

The PL box was not sensing boost, as the blue light was not coming on when I started building boost. I spoke with garr at OVS, and he doesn't think it is the box, but I am about done. I've been out 8 times on this thing this year and 7 times have had issues.

The only thing i did was changed the fuel regulator, I did not touch anything else, it was holding boost at 11.5# just fine the week before the regulator went out.

I am packing her in for the year, jsut too much hassel, but would like to figure it out.

BTW, we has 14" of new stuff at 4500', and the good riding is at 6000', sure there must have been 2+ higher up.

Oh well, maybe next year.

 

[WyoBoy1000]

its a ghost that needs to go under, It doesn't make sense the box not sensing boost with that much. Maybe the boost adjuster went bad, but it still doesn't explain the box not sensing it.

 

[knzee]

Pretty much the only way your fuel box would not see boost is if you have a hole, crack or object stuck in the line from the air box to the p/l box. Replace that line or pressure test it. I bought a replacement valve stem for a truck tire and trimmed off the rubber on the end so it will fit into the boost lines and then you can use an air pump for your fox shocks if you have one. If they are fine it has to be your fuel box. those are the only two things that make that blue light come on if you are building boost.

 

[mynewuseddoo]

Or you could just use your mouth to blow into the boost line. I would be very careful that you don't over pressure your sensor with the Fox air pump and accidentally break the sensor.

I do agree with Knzee, if your box isn't seeing boost, your boost hose is plugged, pinched or broken somewhere. If you are over boosting I would also check the lines running to and from your boost controller for cracks pinches or blockage. If the rod coming from your waste gate diaphragm is straight and not bent, I would also be certain to check that your back up locking nut hasn't come loose. If it is the bent or curved style then this piece will be fine.

 

[WyoBoy1000]

The waste gate actuator on the turbo might be leaking and not pressuring to release boost. is the line going to the box a separate line all by itself or is it tee'd into another one.

 

[knzee]

Or you could just use your mouth to blow into the boost line. I would be very careful that you don't over pressure your sensor with the Fox air pump and accidentally break the sensor.

I do agree with Knzee, if your box isn't seeing boost, your boost hose is plugged, pinched or broken somewhere. If you are over boosting I would also check the lines running to and from your boost controller for cracks pinches or blockage. If the rod coming from your waste gate diaphragm is straight and not bent, I would also be certain to check that your back up locking nut hasn't come loose. If it is the bent or curved style then this piece will be fine.

yeah, I pretty much just use the fox pump to test the waste gate operation. You can watch it go from open to close and watch the amount of pressure it takes to move it to full open and full close. Testing the line to the fuel box, just pull it off at the air box and blow, his is probably going to make a whistling sound from under the steering plate cover where it t's. If you are building boost on the gauge you should still see it at the fuel box even if your waste gate is not operating correctly, shouldn't you.

 

[knzee]

Did it do any damage to the pistons due to the detonation?

 

[WyoBoy1000]

yeah, I pretty much just use the fox pump to test the waste gate operation. You can watch it go from open to close and watch the amount of pressure it takes to move it to full open and full close. Testing the line to the fuel box, just pull it off at the air box and blow, his is probably going to make a whistling sound from under the steering plate cover where it t's. If you are building boost on the gauge you should still see it at the fuel box even if your waste gate is not operating correctly, shouldn't you.

It should unless the box is the wrong one.

 

[hatchers]

As with any troubleshooting event, undo what you did that caused what you think is an unrelated problem, this should be the very first step, heck ya might stumble across something you inadvertently did

 

[snowmanx]

Ya, deto caused the ring land on the pto to break, I visualized it through the valves. Soooo, I'll need a top end rebuild to boot!

I blew through the boost hose coming from the box to the airbox, and I could blow through it.

I checked everything I did when I changed the fuel pressure regulator, I don't see any kinks or holes. However, I am going to replace all the lines from the airbox to the box, the regulator, and there is another hose coming off the airbox but I forgot where it goes, the actuator maybe? I'll also replace the line to and from the boost controller.

There is no T in the boost line from the fuel controller to the airbox. Just a straight line.

I took the boost controller apart, pretty simple setup, don't thing that is it. BUT I also took the needle jet completely out, and didn't note how far out it was, so I am not sure how to set it again properly.

The arm (arm) coming off the wastegate actuator is straight, and the nut is tight. I did take the arm off the wastegate and it seems to open and close freely, I will hook it up and try pressuring it up.

My gut is telling me its the box? But I'll try all these other things too.

THE REST OF THE STORY.....I had to turn around 45 minutes from the staging site, as i left my helmet on the deck, I got the helmet back, but now I'm frustrated and pizzzed, not paying attention to my speed, and I get a $95 ticket for going 60 in a 35 work zone!!! lol my bad.

Then I get home and I start vomiting out of the blue with norovirus(gastro-enteritis) and and spending much of my time in the bathroom this evening and night. LOL WHAT A DAY!!!!

Its gotta get better doesn't it?

Anyways, thanks for all the info, I'll continue to trouble shoot when I can, I start night shift for the next 5 nights, but I'll keep everyone posted as I try new things.

Thanks again.

 

[catmanm7]

Ok, Ill give my 2 cents based off your last post..
All boost lines have to be hooked up or capped off. So if you have an extra line it goes somewhere. Since you just did your fuel regulator, that should have a boost line. Here is a list of all items that should have boost reference lines hooked to them...
Fuel Regulator
Boost gauge
Fuel controller box
Boost controller
Wastegate
Vacuum Reference lines should go from motor side of throttle bodies, to a BOV. This may not apply to you.

If there is more then someone can correct me.
So in your case, I am just guessing, but with the recent fuel regulator install, did you hook the boost line back up? If not then that would be a boost leak, therefore, maybe not sending signal to the the PL box. If not, then you may have the best plan in either testing for leaks or replacing all boost lines.

I tested my whole setup by going to the hardware store and grabbing a rubber sewer line adapter (4"-2") and clamped it where my airfilter went. Put a piece of 2" abs pipe on the adapter and then a 2" cap on the abs. I drilled a hole and installed a tire valve stem.
Then I put a sewer line rubber cap on my exhaust.
Turned my compressor down to 8psi and hooked up air to the valve stem. If there isnt any loud noticeable leaks. Stick a long piece of rubber hose in your ear and use it like a stethoscope checking for leaks on EVERY connection. Now my sewer adapters leaked too, but it held enough pressure that I could check for leak. Check your boost gauge and make sure it is reference less then 8psi or it may be off.

I have small leaks everywere and it is killing me on tuning. So I recommend getting everything to seal 99%, because nothing will ever be 100%. Good luck, sorry to hear you have so many troubles.

What airbox do you have? Wasnt your setup boondocker at first, or was that someone else.

 

[snowmanx]

ovs setup.

 

[catmanm7]

If you boost knob wasnt bleeding off, isnt that the only way to have overboost? I mean how can your boost gauge read 16#s and nothing at the PL box. What if you bypassed your boost knob, and went straight to the wastegate. I would think that a boost leak would mean you wouldnt have boost, not overboosting. And how would the PL box affect overboosting, it just uses boost as a reference. If it had a leak, then I dont see how you could over boost. I am still learning, just trying to figure out how everything works and not work.
What if your gauge was bad?

 

[WyoBoy1000]

If all lines are tight and in the right location, then from the discription you have more than one problem, to me it would be either the (as far as over boost) boost gauge, boost adjuster, or the waste gate actuator. I would start with pressuring up the waste gate actuator, then T a boost gauge into the line from the waste gate actuator and boost adjuster to see if you are getting any psi to the waste gate actuator, If not the it would be the adjuster. As for the box if its completely hooked up right, then your box is not working. You should be able to blow on the line going into the box and get the blue light to come on, if not try putting 10lbs of psi to it to make sure. Your sled isn't building boost at idle is it, if it where it may confuse the box.

 

[Summer Sucks]

There should be three hose barbs coming off the air, the first hose goes to the fuel regulator the second one goes to the actuator and the third one is to the boost gauge and teed to the Pure Logic controller. Mack sure that you can blow threw the line but also that there's not a hole in one of them.

 

[KAWGRN]

I had a run away boost condition a few years ago and it was where a hole was worn through the hose to the boost controller by a F**n tie wrap I checked it by running a new line directly to the waste gate,,,, then it should boost only to what ever spring is in the waste gate actuator ,,usually 10psi .. and I usually run my boost guage and my PL box on the same hose ,that way if the guage sees boost then the PL box should also be seeing boost,, Easier to diagnoise/isolate problems that way, I also had a turbo smart controller that had a small bleed hole in the side and it got cloged one day in epic powder and had the same issues, I still think I should have kept that chassie I thought when you bought that thing it had a 1200 in it ??,LOL

 

[KAWGRN]

I had a run away boost condition a few years ago and it was where a hole was worn through the hose to the boost controller by a F**n tie wrap I checked it by running a new line directly to the waste gate,,,, then it should boost only to what ever spring is in the waste gate actuator ,,usually 10psi .. and I usually run my boost guage and my PL box on the same hose ,that way if the guage sees boost then the PL box should also be seeing boost,, Easier to diagnoise/isolate problems that way, I also had a turbo smart controller that had a small bleed hole in the side and it got cloged one day in epic powder and had low boost , I still think I should have kept that chassie,LOL

 

[taylorbok]

check your bov?
if not this i would say a pinched line to your wastegate. keep us updated

 

[snowmanx]

Haven't had much.time at all to do any diagnosing, but I did apply about 12# of air pressure to the box and the light blue light went.on. could there have been ice in the bpl box that melted and evaporated withthe warm weather? This probably wouldn't.explain overlooking though? Also took the boost controller off and put air to the actuator and it opened as well. I took the boost controller apart, not sure if that was okay or not.

KAWGRN.... IT is indeed.a sweet.chassis, that's why.I haven't sold this think, cause I do believe once j get everything figured out it will climb with most 4 strokes out there. I've.climbed some very steep stuff anf the nose stay down incredibly well.


I'll update as I work on it and figure out what's going on. Guess it will be next.year before I hopefully get to see the capability of this machine. I think many will be surprised. I have had a few good days on it and when everything is clicking there isn't anything I've tried that seems to even challenge it.


Here's to next year!!!!! Lol

 

[WyoBoy1000]

Next year! Its still snowing, the best riding I had last year was the end of april beginning of may