truck is running odd

rat49f6 · #1 (**permalink**) 10-25-2009, 05:42 PM

ok on thursday made my own oba and disconnected the red line off the turbo. im now aware thats not needed so its back on. last night and all day yesterday the truck ran amazing with the oba i did throw codes earlier in the evening but no running issues.
this morning i checked my oil (habit i do it every morning)and started my truck up and noticed a severe lack of power. im not getting much smoke definetly not as much as normal and very little to no boost.
the truck will runn up to 70 mph on the highway and seems to boost some but the gauge reads zero and no darh vader noises out of it when i let off or shift

so i guess ill list my observations:

much less black smoke
no boost on gauge
turbo 25% as loud as normal
oil is good
red line is back on
air filter is good
i/c boots are on

im thinking maybe i popped the wastegate open and it stuck open ??

big poppa · #2 (**permalink**) 10-25-2009, 06:15 PM

I'm almost 99% sure, you need to open you OBA a little bit more, allow the map sensor to see a bit more air flow. When I made mine, thanks to Jim, I preset my regulator too much and the map wasn't reading any boost, so the truck cut out, if you know what I mean. How did you measure the boost output to the map sensor??

rat49f6 · #3 (**permalink**) 10-25-2009, 06:21 PM

yeah i set it at 19. the forney mini reg i bought has the gauge on the front but now i dont remember which way on the knob lets more air in

rat49f6 · #4 (**permalink**) 10-25-2009, 06:23 PM

oh and mike it ran like a champ for a whole day after i installed the oba

big poppa · #5 (**permalink**) 10-25-2009, 06:36 PM

I think clockwise it closes it up Jim, meaning it doesn't let the map see any pressure, counterclockwise, it lets the air flow thru the reg. to the map. Loosen it up a bit and take the truck for a drive, keep testing until your satisfied..

rat49f6 · #6 (**permalink**) 10-25-2009, 06:58 PM

any reason it would have ran fine for 24 hrs then to day fall on its face
it seriously feels like driving an old IDI with extra fuel to it

big poppa · #7 (**permalink**) 10-25-2009, 07:14 PM

Maybe the knob rattled loose from the vibrations, just throwing some senarios out there. If the knob is loose, throw a strip of black tape across it after you get it set again and let me know what happens. This is what mine looks like, air compressor regulator.

rat49f6 · #8 (**permalink**) 10-25-2009, 07:22 PM

thx ill try that

megawatt00 · #9 (**permalink**) 10-25-2009, 07:28 PM

Jim did you tighten up on the waste gate rod? It kinda sounds like a boost leak. If you had gauges you could watch your EGT's . When i misaligned my spider mt EGT's were high and my boost was very low

rat49f6 · #10 (**permalink**) 10-25-2009, 08:06 PM

Jim i didnt touch the waste gate rod
I have gauges i can easily hit 1250° on 140 tune now i can barely spike 1000°

megawatt00 · #11 (**permalink**) 10-25-2009, 08:14 PM

Try removing the OBA and see if it improves. The no boost on the gauge tells me that there is a boost leak somewhere

big poppa · #12 (**permalink**) 10-25-2009, 08:25 PM

I agree with Jim, unhook it and re-attach the line to the map sensor and see. I still think its the regulator, same symptoms I had.

rat49f6 · #13 (**permalink**) 10-25-2009, 08:37 PM

Thats my plan im gonna check for leaks and see where i stand

rat49f6 · #14 (**permalink**) 10-26-2009, 05:11 PM

so in the process of taking the oba off i broke the nipple off the map sensor ... soooo now the truck is down till thursday when i can afford a new one

big poppa · #15 (**permalink**) 10-26-2009, 07:05 PM

O no, couldn't you glue it on in the meantime, its plastic right??