What makes the p13 run in limp mode?

[boostntofu]

Im thinking I need a new map sensor vtec is not engaging at the proper RPM and sometimes engages at different rpm points.

[totaldoughnut]

Do you have any faults logged? Not sure about Honda ecus, but on diesel ecms they have engine protection features built in and certain fault codes will enable the engine to run in a derated state to protect itself and get to a shop.

[noobcake]

get a p28
chip
and
tune
problems solved

[boostntofu]

i know i can get a p28 or a p72 and mod it that way. I think it is the vafc or the map sensor messing with it I dunno tho Imma take it to this honda guy i know.

[92bently]

eh if u are running a stock ecu, with a vtec controller its proly not set up right, or took a shit on u....i would remove the vafc,check for codes, and then get a chipped ecu that will give u more reliable pwer

[Flatline]

Do you have any faults logged? Not sure about Honda ecus, but on diesel ecms they have engine protection features built in and certain fault codes will enable the engine to run in a derated state to protect itself and get to a shop.

But that's ^^^ pretty helpful. Wish a couple of my old cars had that!

[semitas]

im having the same problem, except mine only runs rough when the car has cooled down, once it warms up there is no problem, and the thing is thar when its idling rough and you give it gas intead of reving up, it revs down, like air is going into the cylinder but not enough fuel, but my egr valve is not hooked up, hopefully after me and my friend re wire the engine and hook up the egr, that problem will go away because if not i will have to get a p28

[smokeeey420]

if u get a chipped ecu and replace it with out fixing the problem first then it might mess up your engine.

limp mode is there to prevent damage and to tell you, that you have a problem.

is there any codes flashing??

edit: you should use a period so it doesn't look like one word
map sensor. vtec

[deevergote]

If there's a CEL, that'd be why it's in limp mode. If you messed with the VAFC and don't know what you're doing, that could be why it's in limp mode. As suggested above... remove the VAFC, check for CEL codes, fix whatever the codes tell you is wrong, and see if that fixes things. If it doesn't, you have other issues.

What do you have that you need a VAFC anyway? Are you boosted, as your name suggests? If so, you shouldn't be running a VAFC to tune anyway!