Lumpy idle after bedlining interior

[jdm_master_X]

Isn't that strange? MrZabala, ppd_sileighty, and myself just finished my car. we're just wrapping it up, so hopefully, ill get pictures up and a writeup. definitely came out great.

Anyway, what happens from what I know is that the problem only occurs when the car warms up (in this case, closed loop operation). what happens is the car will jump up 500 rpm and drop back to normal, and repeat (as if i had aftermarket cams...haha). and oh yeah, the tachometer doesnt work (but it never worked well anyway, so i have my spare cluster to drop in anyway). i dont think the ECU would run the engine with a lumpy idle if its relearning its values.

parts of the blue ECU plug got painted a bit, so i was wondering how could i clean them? i dont know how to depin the plug one pin at a time, nor do i have a tool to do it. and there are still ground wires that i need to clean up because there is paint and some leftover bedline on them. one more thing i had to bring up. i threw away all my AC assembly, and i cut some plugs from the AC assembly that is part of the harness (AC signal blue wire green stripe i think?). would that effect engine operation? i know when wiring up the SR, that wire is also mentioned for getting the car running.

anyway, ill update you all on how the car is running. in the meantime, i would appreciate any feedback about this. hopefully, we can figure this out. thanks guys!

[Blown240sx]

The blue plug is the ECU Relay shouldnt effect your idle. It sounds like you have a MAF, IACV, or Boost leak problem.

[jdm_master_X]

im talking about the large multipin connection for the ECU, not the ECU relay.



there is paint on parts of it (slight overspray, nothing big).

[Syes200]

Only if it got inside the plug where it connects with the ECU, if it's just on the housing of it, it won't hurt it.

[jdm_master_X]

it got on some of the pins. i left my car at MrZabala's house so he's relaying info to me about my car. when he depresses the clutch it doesnt idle weird anymore. and its not lumpy every other second anymore, but within 30 seconds, it would idle weird abot 2 times. im letting MrZabala start the car on and off to get the ECU to relearn some values during closed loop operation.

[Blown240sx]

O sorry didnt know it was a S13 you didnt say. Also why would you be careless like that? I mean tape any important plugs off before you paint is common sense.

[jdm_master_X]

we did tape it up, its just a small amount managed to get into it. we sealed the entire harness in paper wrap and taped it up. we had no clue as to how paint managed to get into parts of it.

so ideas?

[S13FASTBACKSR]

for one make sure the blue ecu plug is tightened into the ecu evenly and all the way down...also i think paint on the plugs could mess something up ..it makes senses..it seems like the signal would not be as good or not go through at all..check on the back of a can of paint thinner and see if you can or cannot use it on electronical parts...same for anything that will remove paint

[jdm_master_X]

yeah i think the contact of the pins to the ECU is erradic, so the ECU is trying hard to maintain the idle by raising it a certain amount. that makes sense.

[S13FASTBACKSR]

exactly..check the paint thinner and other components compatablility with electronics

[mrzabala]

Hmm I checked the pins and they looked find to me (didnt see any paint on them). If needed Ill get some paint remover that wont damage the pins or wiring. As for the ecu I made sure they were pressed down evenly and secure. Im thinking now that its the ground wire that I bolted onto the dash bar since I forgot where it went (its near the ecu wiring above the blower). But now I know Ill make sure the grounds are sanded to make a good connection. But as of now the rubber coolant pipe is leaking (its under the return coolant pipe, I think thats what it is, where it clamps onto a hard pipe below the intake manifold. So I cant run it as of now since the coolant was very low (the coolant reservoir didnt have anymore more coolant nor the radiator when I opened the cap). Probably need a stainless steal or something to replace it all?

[mrzabala]

Since you didnt know that it was an s13, stop making assumptions about taping it off. Dont wont to seem like an ahole but **** man stop waisting our time and yours if you dont have any helpful advice. No point in posting stupid assumptions and have to go out of our time to let you know that it is and we already did. Its stupid so dont bother replying.

[240Knightrider]

You said it stops when he puts the clutch in???

could your clutch not be fully disengaging... mine did that..so its just a thought

[jdm_master_X]

well there is a simple explaination for that....and that is because the engine is completely unloaded when you disengage the clutch. even if you are in neutral, you are still engaging the clutch and rotating the input shaft. the clutch would have nothing to do with idling in this situation.

does anybody know if the S13 uses an ambience temp sensor on the AC assembly?