Need Help Diagnosing Some Trouble

We may earn a small commission from affiliate links and paid advertisements. Terms

Elnyne

New Member
Hey all I have a problem, I having trouble diagnosing...:confused: when ever I get into 5th gear in my 1995 Civic DX coupe with a JDM D15b swap, it feels like the car gets heavy or under powered and actually loses speed. I changed the spark plugs and it seemed to cure it... for 2 days then on my way home tonight it started up again. I've checked the timing, fuel filter, Clean, changed oil and filter, air filter is clean, catyltic converter is working properly, had it checked, no clogs "beautiful flow" they said. also checked wheel bearings and for sticking brakes, and nada...so could it be a faulty MAP sensor? could it be or some other sensor? I'm not getting a CEL . and I'm running the proper P08 ECU for the D15B but I still have it wired with a 4 wire O2 sensor instead of the 1 wire. (The ECU isnt looking for the heater wires so that shouldn't bother it right?)

Jason
 
Last edited:
Check the TPS. I've had mine go bad and it didn't cause a CEL. When it went bad the car ran like ass under low throttle conditions, i.e. cruuising in 5th gear.
 
check the volts i think its the middle wire
but i dont know the specs sorry
 
Closed throttle is .50 volts and WOT is 4.5 volts

To test your TPS, ground one lead on the chassis somewhere and touch the positive lead to the pin on the TPS (should be the center pin) and measure the voltage. Rotate it until it reads .5 volts, then tighten it down. Have a friend press the gas pedal to the floor and also check that WOT reads 4.5 volts.


Taken from:
OBD Wiring Guides
TPS Installation and Testing (Step #12)
 
also what trany did u use? if u used the DX trany there is ya loss of power lol... u need a EX or SI trany :)
 
Thanx guys Sorry I've been away for a while. I put in a spare Throttle position sensor I had. as well as a map sensor. This helped alot. now I actually can accelerate in 5th albeit slowly, and I'm still using WAY to much fuel. Also the engine turns over like it overly advanced.(it's not It's spot on!) it'll crank for a second or 2 then start to stumble and catch up. could that be a fuel pressure problem? I talked to a cousin of mine who said he had a similar problem with his 3rd gen talon. He switched out the fuel pressure regulator and it seemed to cure it. I wondered if there might be a consenses on that here and if so, how do I trouble shoot it. Can I pop off a hose and try to suck or blow? ( already did and no give either way...so what does that mean? LOL) As far as Tranny's go it is the DX model I know it has the wrong gearing but I'll live with it till a LSD SI trans becomes available for cheap.

Jason
 
Last edited:
switched out the Fuel Pressure Regulator with the one off my old B7, we'll see if it makes a diffrence on tomarrows commute. if not I'm tearing into the fuel pump. maybe it's on it's last leg and losing pressure... will also switch out the fuel filter...AGAIN! lol

Jason
 
changing the FPR DEFINANTLY helped! now it just is slow becuase of the trans... anyone got a D15B 5 Speed w/ a LSD for cheap?
 
Back
Top