i have a 1997 civic ex with a 1997 gsr swap and i have a cel on. it is the map sensor. it says that the voltage circuit is high. i figured it was a bad sensor so i replaced it. cel still comes on. i have a zex kit, comp cams, aem cold air intake, 2.5 inch exhaust, an apex vtec controller, and cam gears.

the cell has alway been on but i have had no problems with drivability untill recently.

the problem i am having is sometimes the car boggs down when i accelerate from a stop. it doesn't do it all of the time though. also sometime my idle goes up to 1300 rpms instead of the normal 800 rpms.

i just put the stage one comp cams in this weekend and the problem is now becoming more consistent; however, the problem was present before the cams.

wtf?????? i am doing a search as well but nothing so far.

 

anyone? anyone? anyone?

 

i want to say you have a broken wire or something is tapped incorrectly along that circuit, possibly the vafc.

 

might have to due with vacuume leaks maybe. just a guess. bad resistance in signal wire or ground

 

i don't think it is a vaccuum leak because since the map sensor bolts directly to the throttle body and there are no vaccuum lines. i know it is getting voltage because the signal it is getting voltage back to the ecu. the ecu code says the input voltage is high. that would mean less resistance in the wire if it were a wire issue. don't think that a wire would loose resistance over time. someone correct me if i am wrong. help me pinpoint the issue. since it is getting a signal back to the ecu i would assume that the ground is good because it is completing the circuit. anyone else.

the code tripped before the vafc was installed. just recently became more of a problem.

 

The vfac is some type of tuning device, correct? Is it a complete PCM ("stand-alone"), or a add-in chip? Are you sure it's programmed properly? The additional airflow (resulting in lower vacuum) through the performance cams could cause an error with the MAP sensor in a stock or close-to-stock tune. Also, where are your adjustable aftermarket cam gears set? It's possible that they're set wrong and the timing is off slightly, which might explain the low-RPM acceleration problems and idle differentation.

Also, there could be a problem with the wiring somewhere. It's time to pick up a FSM and start doing the factory diagnosis for that code and see what you come up with. If all the tests pass, it's a problem with the aftermarket modifications.

This should be a lesson to you. Never modify an engine unless you know for sure it's problem-free. Personally, I'd have fixed any CEL codes or running problems before installing the cams. I know it's a PITA, but you may want to re-install the factory camshafts (and make it as close to stock as possible) and fix the problem from there, then re-install the mods.

 

i checked the cams and the timing on the cam gears and everything is at zero degrees and tdc. the vafc is a piggyback and it was professionally tuned on a dyno. not to say that it was done correctly but it was done by a claimed professional as well as the install of the vafc.

would there ever be a situation in a na car to require a map sensor beyond what the factory one is set on. say maybe installing a gm 3 bar map. maybe the throttle body, manifold, and intake are all sucking in too much are and disrupting the factory map. i know that the factory map sensor won't read beyond i think 10.65 psi and it maxes out at 4.5 volts due to a diaphram. i wonder if it is sucking in too much air and bursting the diaphram and hence voltage too high tripping the code. putting in the cams just made the problem more apparent because it is now sucking in even more air and fuel.