JDMPreludePower

I have a 92 Honda Prelude that has an idle problem.The car isn't doing to good the car starts to sputter at about 4000rpms.I have already checked for vacuum leaks and it has none.I also cleaned the Idle control valve and the fast Idler valve I'm stumped.I have been going at it with my prelude for about a week now.Can someone help me out. Oh and I blead my coolant

motoxxxman

it "sputters at 4000 rpm" and you're calling it an idle problem?

TimiK

JDMPreludePower

Thanks bud I've done about half the things on your list.But you mentioned some new things that I will take a look at Thanks bud

TimiK

Does it throw any codes?

JDMPreludePower

Yeah the map sensor I already checked for vacuum leaks and it has none also cleaned my Idle control valve and fast Idler valve.

JDMPreludePower

I've already checked the wiering and its good changed the map sensor 2 times to make sure.

CJBB6SH

Did you reset the ecu after you installed the new map sensor? Also i dont understand how your car sputters at 4000 rpm and your calling that an idle problem. If you changed the MAP sensor and your still getting codes for it then its likely not the sensor thats the issue but wire harness that goes to the sensor. Check the harness for resistance with the battery disconnected, you should have no more than 0.02 ohms. If the resistance is high then you have an open in the circuit or the harness is damged. Another common issue is people mistakenly get the tps harness and map sensor harness mixed up since they look the same and connect the wrong harness to the wrong sensor. i would just start with swapping the tps and map harnesses and seeing if that makes any noticable difference. if not then check your reference voltage and do a parasitic drain test. Also i would highly suggest compression testing it as well. Sputters at 4000 rpm sound more like a compression leak or worn piston rings to me.

holmesnmanny

i would agree with the swapped connectors theory, if not swapped, check the map sensor connector with the ignition on for 5v one one wire, .45 volts on another and ground on the third, if they are all good then the ecu is likely bad

JDMPreludePower

Yes I did reset my ecu and a friend of my checked the wiering but it wouldn't hurt if I did it myself.

JDMPreludePower

Can anyone tell me how do I check my wiers? Thanks

holmesnmanny

JDMPreludePower

I think if it was a swapped connector the ecu would throw both connectors codes.

holmesnmanny

and which code does a bad fan switch throw ?

JDMPreludePower

Bad Fan?? I dont know I dont have a bad fan bro.

motoxxxman

Huh? What does that have to do with anything?

JDMPreludePower

Iv narrowed down to my Injectors or my gas pump.I saw some on ebay for a fair price I'll keep you guys in the know.

holmesnmanny

When you swap connectors, it's possible to swap the fan switch connector with the map sensor or the iacv sensor since they use the same connector.

You won't know til you look but clearly that's not going to happen since it's way too much work to just look at the connectors. I'm done with this thread.

JDMPreludePower

Actually the connector to the map sensor is shorter cause of the location. lol

JRCivic1

The point Holmesmanny was trying to make is that if the connectors for the TPS and MAP sensors are reversed, no code would be thrown by the ECU because both circuits have a 5v threshold and would be operating within that range... the values would not be correct for the ECU to run the engine properly, but within the voltage range. You didn't provide any pics of your wiring, so we wouldn't know whether the plugs would physically reach or not. MANY Honda applications have enough slack on these two plugs where they can be mixed up.

JRCivic1

It won't... see my reply above as to why.

This is SARCASM... but basically the same answer that I gave you. A bad fan switch WON'T throw a CEL... it just won't turn the fan on.

You really need to focus on the MAP sensor code. Try a known good sensor, test all wiring for proper voltage/ground AND continuity to appropriate locations at the ECU, and finally, test a known good ECU.

motoxxxman

I'm well aware of the connectors being the same. but the fan switch connector won't reach the map or iacv. Hence me asking what it had to do with anything

holmesnmanny

There are many threads where the connectors get swapped and the fans stay on all the time as a result. Not my fault you aren't knowledgeable enough to know that. But keep thinking you know more than you do.

motoxxxman

I will thanks. Keep insulting people as if you're better than them. Everything ok in your life? You used to be a decent human.

holmesnmanny

hmmm....