Using hondalogger, we can monitor the output of the tps sensor. when cranking it is at .48 volts and 0% throttle. After cranking and idling, maybe reving it up for a few seconds, it works fine. After no more than 20 seconds we get a tps code and it sits back at 1.5v and 26% throttle on the hondalogger. We have replaced with known good tps sensor with no luck. TPS power wire has 5v. Signal wire is good. We checked resistance of the ground wire and it was 200+ ohms. Decided it was high and had it go straight to the frame, resistance dropped to 20ohms, and a good ground. Need to know where to look, as this is simply ridiculous. Also, we have no o2s hooked up right now and the hondata is reporting 3.81v to each sensor. I had the same problem on a vx with a gsr, and it was because the people that did the original swap tried to rig the 5 wire vx plug with a 4 wire o2. Whats going on?

 

Got a spare honda ecu laying around?

 

stock honda throttle body?

 

As far as stock ecu goes, yes, but the car won't even start with a stock ecu. Its got 720cc injectors and was flooding out pretty bad when we tried that. I should have also mentioned this earlier, but its not a stock TB. Its a BBK 70mm TB. Here is the setup:

Benson Sleeved Block
Benson ported GSR head
JG Intake Manifold
BBK 70mm TB
SFP Race manifold
Precision Turbo PT54 turbo
HKS Wastegate
Custom Precision Turbo IC
SFP piping
HKS BOV
-8 / -6 fuel line
Venom fuel rail
venom 720cc injectors
paxton billet fpr
venom fuel pump

I think thats all that matters

 

Surely someone has seen this kind of problem, and if you tell me, I'll stop calling you Shirley.

 

Alright, part 2 of the tps saga. We ran new wires from the ecu to the tps sensor and put in a known good tps sensor. It works! No problems at all. We drove the car last night and it worked fine. We drove the car tonight, and decided to datalog for a while. Well, the tps is off by a large margin, so we decide to set it correct at idle. We loosen it and as soon as we touch it, bam! code 7, and it quits working. Tighten it up, clear the codes, and it works. Touch it and it freaks out. Tell me one of you has had the same problem, or at least know what the **** is going on. Its a BBK 70mm TB. This makes NO sense. We are about to trash this damn car its so stupid. What do we do?

 

Problem identified. Ran into a similar problem on a JG throttle body. Throttle stop was made of aluminum. Under prolonged WOT conditions, it would vibrate and dig into the aluminum, pushing the WOT TPS voltage beyond service limits, illuminating CEL. Putting on stock TB eliminated problem.

Stock TB is the way to go for now...

 

Arghh. We decided to try the stock TB and it worked for about 10 minutes. Drove down the road, turned around, everythings fine, glance back, code 7. WTF is going on? I have never seen this kind of thing in my life before. Hell. we have just thrown tps sensors on cars before, never calibrating them, and had no trouble. We had this one set PERFECT, .47 0%. Any more ideas?

 

so what are your voltages at idle and WOT? It needs to be below .5 volts at idle, and below 5 volts at WOT. I'm sure you know that, but I am only seeing you checking idle voltage, not WOT. Check it with the car off.


[Modified by VaporTrail, 3:19 AM 10/16/2002]

 

Sorry, should have posted that before. WOT voltage is 4.5. Thats why I am totally lost on this. It makes NO sense. Another thing. Car runs like butt when in closed loop. TPS quits, car goes into open loop and it runs great. Hell, I think we might just leave it in open loop all the time.

 

Did you datalog? If so, what did the TPS voltage do?

 

well i don't have a turbo setup currently, but have had problems with my stock GSR TB and TPS since last year.

last year the motor was all stock and started surging at idle. i changed everything but the TPS since it was "riveted" onto the TB. then i took the motor out of the car for a rebuild and when reassembled it was still doing it so i swaped the TB out with a good 97 GSR TB. the motor idled fine and no codes of any type.

in the meantime i replaced the TPS on the original TB with a known good one. then i swapped the old one back in and it did the same thing. so i changed the TPS again with the last good one i had, same thing. then i metered the voltages on the 2 good TPS and they were operating correctly, 0-4.99 volts output and 5V input. so i set the voltage to .5 at idle and checked the WOT voltage. it was only 4.02V which i figured would be fine, though it should be about 4.5V.

anyway it's still doing it no matter what sensors are used/metered. all the wires and other sensors are ok. i'm dumbfounded as to why the car won't idle correctly and the TPS code comes on.

i'm not using a turbo setup with Hondata, but i seem to have similar problems and can relate to the situation. it's damn annoying when you can't get it to idle and run right.

sorry this is kinda long and offtrack, just wanted to let you know there are others with TB/TPS problems. hope you find a solution soon if you haven't already. my solution is replacing the TB with a newer stock unit so i don't have to play with the TPS voltage anymore.

 

sorry to bring this back from the dead...but i am having this same problem w/ stock TB. along with it reading code 7 and not reading the TPS (stuck at 25% and 1.5) it wont let me rev past 2500. anyone know what is causing this??? possibly fried ECU???