So the real question is what can you do in order to stop the code from popping up?

 

Might be the map sensor?

 

Yes


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Agreed... and even if you were generating that much boost, IMHO, that would be a step backwards. The MAP sense triggers the logic for that code in the PCM when the boost gets in the "high" 20's of ( MAP - BARO ).

I'm assuming you still have your '96 7.3l with a Garrett TP-38... stock turbo or with what mods? Have a boost Gauge hooked up? or any other way to measure it? For me to ask you how high the boost actually gets before it gets this code...

Next question is to ask if you have a cold air kit... sometimes. although this sounds crazy, people will get that code from a bad or missing IAT sensor after installing a cold air kit. Things are tied into that sensor, so it needs to be plugged into the harness, even after removing the stock air filter housing...

Next question is... who's tunes are you running on that TS switch? Sometimes there is a suppressed flag on that code, but could also be not flagged when it should be.

Next note is... if it is truly too high a boost (above about 27 psi...) then the accepted method to deal with that is to use a boost fooler, to tell the MAP sensor that it is only getting about 25 psi max. I think the tables for the '96 top out right below that. so anything above would not make a change with the MAP anyways.

Explanation why Joe and I seem to think that adding a wastegate to a pre 99 is a bad idea? Because you pay extra, big money in mods to get more boost to get more power!!! Seems backwards to dump that hard to get and expensive boost pressure. Stock boost on a 94-97 tops between 12-14psi. Mine, even with all the expensive mod's I've done over the years and it's on my bench again now trying to squeeze a little more out of it... We figure it might possibly get between 25 and 30 psi boost... Which would be amazing for a TP-38. Just adding a compressor wheel may only get you around 7 psi. That is not going to peg your MAP sensor...

More boost doesn't happen by accident. So if you started with a stock TP-38 and you can't remember spending at least about $600 in turbo hard parts (without labor) with the primary goal of adding more boost, then I'd be looking at another reason why you're getting that code. You haven't implied that anything else is supporting that. Just saying that either the story is incomplete or something is missing from that equation.

 

Hi and thanks yes I have a cold air intake and a boost gauge I top out around 33psi turbo is a garret I bought the truck used and do not know what mods have been made but when I shift it's that quick second between gears that triggers the turbo code. The truck has a 5speed in it with a aftermarket clutch and the ts chip is stock 50,75,100,140 hp unknown who tuned it


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So yes... If are getting 33psig boost, that's a good thang. You should put in a "boost fooler" in the line going to your MAP Sensor. What that is, "is" a pressure regular that lets out pressure going in that MAP pressure line. It will let that stay below 25psig. At somewhere above that, the MAP sense in the PCM thinks the stock Boost is too high so it triggers a defuel condition (cuts the fuel to the injectors). I have a friend who does this with an airbrush air regulator, so he can adjust that himself... but here:

Ford Powerstroke MAP Dual Boost Relief Valve++ 7.3L 6.0L Boost fooler

That will regulate the pressure to the MAP, but your boost will still be unaffected, at your up-to 33psig. Just make sure you have your Boost gauge fitting on the turbo side of that regulator.

 

Thank apreciate the advice


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