Just got a 240sx with a redtop swap and have some issues

[Blacksilvy]

Ok well first ill say this is my first post here on the forum and am new to the community and am glad to be here. I just picked myself up a 93 240sx that the previous owner had swapped a redtop into. It made the trip from Indianapolis IN to Louisville KY no problems but the big issue right now is a bad idle that would almost seem to be the result of a misfire.

I have already tried setting timing, cleaning iac, swapping coils around to make sure all coils fire properly and checking all injectors for function and they seem to be fine. So after checking for spark and fuel and timing etc.. im open to suggestions and yes i know im going to hear use the search button etc.. but i cant really seem to find anything definitive just threads that die off without anyone posting the solutions to their problems.

[GoinTopless240]

There is a specific way to set timing on these... I forget what you have to unplug when you do it, but if you try do set it with it plugged in the timing doesn't take.... sorry forgot what it was... I'm sure someone here will pipe up..

[Koshin]

you got the car in Indy?? Who did you get it from. What car?? This might help with the timing issue zerothread?id=111597

[Koshin]

You may want to check for vacuum leaks...Are you getting any ECU codes?? Try check them as well. Just some advise.

[Blacksilvy]

Its a 93 S13 and yup picked it up from Indy on sunday , bought it from a guy named patrick found the car on autotrader and grabbed it up nice n quick. As for codes im not getting any thrown out so it doesnt help trying to pull a code to at least start diagnosing it unfortunatly.

[sldewyz]

sorry that i cant really help you but its nice to see that there are people around here(indianapolis area) that have 240's on nico...

[IanS]

Is your BOV recirculated?

You need to unplug the TPS while setting electrical timing.

[Blacksilvy]

Ok guys, i just got done replacing the plugs today with some ngk's from 240sx motoring and tweaked the timing a bit and it smoothed out a little bit but didnt do much for it really, finally i got aggrivated and just disconnected the maf sensor for the hell of it and what do ya know it smoothed completely out hmm i wondering if i have a bad maf sensor now, any opinions people and as for my B.O.V. goes it is not recirculated but i have the sping all the way shut for now, i kno that it is part of the problem but im wondering if the maf is bad now??

[Koshin]

Try cleaning the MAF before buying a new one, and if you do have to buy one buy a Z32

[Koshin]

Try wiggling the wiring running to the MAF as well, you may find that something has maybo come loose also?? Just something to check, the wiring on mine was loose and after I cleaned it I almost bought a new one. Might save u some chedda

[Blacksilvy]

Yeah i was gonna try cleaning it first thing tomorrow at work, any opinions what i should use to clean it with and as for a z32 maf wouldint i need a safc to run it?

[IanS]

Yeah i was gonna try cleaning it first thing tomorrow at work, any opinions what i should use to clean it with and as for a z32 maf wouldint i need a safc to run it?

To clean the MAFs use either, MAFs cleaner, electrical parts cleaner, both are available at most auto parts stores.

You are correct, to use a Z32 MAFs you will need a retune or an SAFC to adjust the signal.

Try cleaning the MAF before buying a new one, and if you do have to buy one buy a Z32

You need to check your information, you cant just slap a different MAFs onto a car and expect it to run correctly, had he listened to you he might have spent hundreds of dollars uselessly. Please try not to spread misinformation.

[Blacksilvy]

how often is it the case that these mafs are actually salvagable by cleaning them?

[IanS]

how often is it the case that these mafs are actually salvagable by cleaning them?

Quite often.

[Blacksilvy]

Well i tried cleaning the maf today and of no fortune it still runs like crap and dies after a minute of running but if i unplug the maf it runs nice n happy at idle so im open to suggestions of what to try next/

[Hijacker]

If you're going to replace with a stock, just buy one for an 89-90 SOHC car. You can get them for a fair price from most salvage yards. Make sure to get the plug too. I can't remember if the plugs are identical or not.

[ryan15]

Hey I had the same problem recently, unplug the tps and set the timing to 15 btdc, I searched ALOT to find out what it meant "second from the right" so basically its like this when your looking at it.

| | | | | |-5 ,0 ,5 ,10,15,20

I hope that helps, it wont hurt to clean the maf either, and check all your plugs, for looseness, cracks etc

Ryan
Modified by ryan15 at 2:50 AM 4/4/2008

[IanS]

Hey I had the same problem recently, unplug the tps and set the timing to 15 btdc, I searched ALOT to find out what it meant "second from the right" so basically its like this when your looking at it.

| | | | | |-5 ,0 ,5 ,10,15,20

I hope that helps, it wont hurt to clean the maf either, and check all your plugs, for looseness, cracks etc

Ryan

Close, your spaces dont show up in post, it should look like this.

*|*|* |* |* |* |-5 ,0 ,5, 10,15,20

Before replacing the MAFs I would recheck timing, and then do a thorough check for vacuum/boost leaks.

[Blacksilvy]

the hell with it lol anyone have a sohc maf and pigtail for sale im in need now lol let me know

Modified by Blacksilvy at 4:54 PM 4/10/2008
Modified by Blacksilvy at 4:54 PM 4/10/2008