boosting problems help!

SleeperSOHC37 · Post by **SleeperSOHC37** » Thu Sep 17, 2009 4:50 pm

Basically the ecu wont let the car go into boost, it used to work fine but now this happens: when I rev the car up to about 3700 rpm when the turbo should start spooling up, the check engine light flashing and the rpms drops, not letting the car go into boost.Initially, I thought it was the map sensor, so I installed a new one (which read proper voltage)and it didn't fix the problem. Next I checked the spark plugs and they looked worn so I got new ones and the problem was still recurring. I even disconnected the battery for a while, just in case the ecu went into limp mode and needed to reset itself. At this point Im sure the problem has to do with the ecu in some way. I still haven't opened the ecu to check if maybe some wires disconnected or got messed up in some way but I doubt thats the problem.

Waffles · Post by **Waffles** » Thu Sep 17, 2009 5:40 pm

What ecu/tuning are you using?

N2HIFI · Post by **N2HIFI** » Thu Sep 17, 2009 7:19 pm

More info about the car and setup is needed please and who did the turbo install if it's not factory

And it sounds like you have a charge pipe off somewhere

SleeperSOHC37 · Post by **SleeperSOHC37** » Thu Sep 17, 2009 9:28 pm

Running a chipped D15b7 ecu with Hondata s200 and it is tuned by Lowe Performance.

Spark plugs were replaced AGAIN 3 days ago (BKR7E's) and gapped at around 0.28. Had BKR7E's before that were put in 3 months ago and were already burnt up. Looking at switching over to some 8 range NGK's soon to see if that helps.

Map sensor was originally thought to be the culprit (wasn't showing power). Replaced the sensor AND ran a new power wire (which was the real problem). MAP sensor is a GM 3 bar that has been tested and works fine. The sensor and wires are showing proper voltage.

Right now it looks like the ECU could be the main culprit. I'm opening it up today to take a look. Will update.

Devil Crx · Post by **Devil Crx** » Fri Sep 18, 2009 12:52 am

did you check the charge pip like n2hifi suggested?

5thgen · Post by **5thgen** » Fri Sep 18, 2009 5:58 am

It probably would not be a leaking boost. If it leaked boost, the map sensor would never know it, and it would run like normal honda without boost. This is as long as the map (at high rpm with no boost) is set up for it.

Devil Crx · Post by **Devil Crx** » Fri Sep 18, 2009 1:50 pm

oh yah, i forgot about the part where he says the CEL came on.

SleeperSOHC37 · Post by **SleeperSOHC37** » Sat Sep 19, 2009 3:31 pm

thanks for all the advice, everything runs fine again. The culprit was actually one wire running from the ecu. Funny how one single wire can affect so much.