help?? Dont know wats wrong - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

RacerBoy · 09-06-2006, 11:55 AM

My 91 240 has been fu#@*& up lately... first it had rough idle . the needle traveled from 400-1900rpms then some times it just starts smoking....

my local mech told me it was the MAF sensor.. got it replaced... but it still did that...

then he said it was a vaccum. got it fix... and its still doing it...

i need help.. the idle is annoying and the smoke is gonna geet me in trouble...

projectRDM · 09-06-2006, 12:28 PM

I'd offer my help, but I can't read your chicken scratch. Try again.

punxva · 09-06-2006, 12:40 PM

try searching, all of these problems have been covered about a million times

Nizzan4u2nv · 09-06-2006, 06:36 PM

check engine light? pull the codes and start from there.

NIK90s13 · 09-06-2006, 06:53 PM

The TPS will cause your idle to serge like that.

RacerBoy · 09-07-2006, 10:10 AM

ok let me try again... bastard

idle is rough... car is throwing black smoke.. stalls... runs crappy oh and it also burns my plugs after smoking...

i change maf and "fixed" vaccums but it still does it sometimes.

ps thanks for the re....

RacerBoy · 09-07-2006, 10:12 AM

there is no check engine light on by the way oh and i drive a 91 so the code thing is complex.....

please help.. ill search too... thanx

RedlineRacer · 09-07-2006, 10:57 AM

My intake manifold gasket was shot and I had similar problems. I could hear the air leak, just had a hard time finding it. Do you hear any air leaks?

HalveBlue · 09-07-2006, 03:47 PM

Where is the smoke it coming from?

Do these symptoms only occure during accelaration or idling, or both?

Do your idle problems occur at start up or after the engine is warmed up? Are the symptoms sporadic or do they happen consistently.

I'd suggest checking your timing and replacing your sparkplugs if they're fouled. Make sure there are no air leaks anywhere. Also check your throttle cable and throttle body. Make sure that they move freely and smoothly.

But, in the end, you might just have bad piston rings (Or at least an oil leak somewhere). That would explain the black smoke.

Anyway, happy hunting.

kaotic · 09-07-2006, 04:02 PM

knowing what kind of motor would help also?

idlafie · 09-08-2006, 01:33 AM

Sounds like you need a new mechanic. He probably doesn't know what the problem is & doesn't want to spend the time trying to figure it out. There could be all kinds of reasons why your idle is crap - anything from a bad IAV valve, to a faulty fuel regulator or bad fuel injector or even a short in the wiring harness or ground.

If you are mechanically inclined and are willing to learn about your car, now would be the perfect time to download a Factory Service Manual from here & read up on your car. By using the SEARCH feature here on Zilvia you can download a Factory Service Manual for free & figure out how to troubleshoot your S13 yourself.

To start, we always recommend you learn how to read the troublecodes off your ECU. This helps a lot when trying to figure out what's wrong with your car. Click on the attached link, ( http://www.240sx.org/faq/index.html ) for instruction on how to read your ECM codes. Once the page loads, look to the left & scroll down till you get to " ECM, reading trouble codes DOHC ", click on that link.

After reading your ECM troublecodes off the ECU, come back & post them here. That should give us a better idea as to what's wrong with your S13 and help us & you troubleshoot your problems better.

Hope this helps...good luck!!

ID

RacerBoy · 09-09-2006, 10:25 AM

damn you guys are great

... thanks alot.. i found out that there were actually 2 problems a vaccum (damn u mech) and a dirty IAC valve. so i got it all fixed and my 240 is running as powerful as ever.. time to kick some 3000gt ass...(i dont hate, its only personal)

S13Koop · 09-09-2006, 10:40 AM

I like ur name

09-06-2006, 11:55 AM	#1
RacerBoy Join Date: Aug 2006 Location: El Paso Age: 38 Posts: 27 Trader Rating: (0) Feedback Score: 0 reviews	help?? Dont know wats wrong My 91 240 has been fu#@*& up lately... first it had rough idle . the needle traveled from 400-1900rpms then some times it just starts smoking.... my local mech told me it was the MAF sensor.. got it replaced... but it still did that... then he said it was a vaccum. got it fix... and its still doing it... i need help.. the idle is annoying and the smoke is gonna geet me in trouble...

09-06-2006, 06:36 PM	#4
Nizzan4u2nv Zilvia FREAK! Join Date: Oct 2003 Location: San Diego Age: 40 Posts: 1,226 Trader Rating: (3) Feedback Score: 3 reviews	check engine light? pull the codes and start from there. __________________

09-08-2006, 01:33 AM	#11
idlafie Zilvia Addict Join Date: Mar 2004 Location: ..So Cal.... Posts: 940 Trader Rating: (0) Feedback Score: 0 reviews	Sounds like you need a new mechanic. He probably doesn't know what the problem is & doesn't want to spend the time trying to figure it out. There could be all kinds of reasons why your idle is crap - anything from a bad IAV valve, to a faulty fuel regulator or bad fuel injector or even a short in the wiring harness or ground. If you are mechanically inclined and are willing to learn about your car, now would be the perfect time to download a Factory Service Manual from here & read up on your car. By using the SEARCH feature here on Zilvia you can download a Factory Service Manual for free & figure out how to troubleshoot your S13 yourself. To start, we always recommend you learn how to read the troublecodes off your ECU. This helps a lot when trying to figure out what's wrong with your car. Click on the attached link, ( http://www.240sx.org/faq/index.html ) for instruction on how to read your ECM codes. Once the page loads, look to the left & scroll down till you get to " ECM, reading trouble codes DOHC ", click on that link. After reading your ECM troublecodes off the ECU, come back & post them here. That should give us a better idea as to what's wrong with your S13 and help us & you troubleshoot your problems better. Hope this helps...good luck!! ID __________________ Weekend Mechanic for my Not-So-Mechanically-Inclined buddies....

09-09-2006, 10:40 AM	#13
S13Koop Zilvia Member Join Date: Nov 2002 Location: Houston, TX Posts: 282 Trader Rating: (0) Feedback Score: 0 reviews	I like ur name __________________ JZX100

09-06-2006, 12:28 PM	#2
projectRDM Post Whore! Join Date: Dec 2002 Location: Atlanta Age: 51 Posts: 13,812 Trader Rating: (12) Feedback Score: 12 reviews	I'd offer my help, but I can't read your chicken scratch. Try again.

09-06-2006, 06:53 PM	#5
NIK90s13 Zilvia Junkie Join Date: Jan 2006 Location: texas Age: 58 Posts: 471 Trader Rating: (0) Feedback Score: 0 reviews	The TPS will cause your idle to serge like that.

09-07-2006, 10:10 AM	#6
RacerBoy Join Date: Aug 2006 Location: El Paso Age: 38 Posts: 27 Trader Rating: (0) Feedback Score: 0 reviews	ok let me try again... bastard idle is rough... car is throwing black smoke.. stalls... runs crappy oh and it also burns my plugs after smoking... i change maf and "fixed" vaccums but it still does it sometimes. ps thanks for the re....

09-07-2006, 10:12 AM	#7
RacerBoy Join Date: Aug 2006 Location: El Paso Age: 38 Posts: 27 Trader Rating: (0) Feedback Score: 0 reviews	there is no check engine light on by the way oh and i drive a 91 so the code thing is complex..... please help.. ill search too... thanx

09-07-2006, 10:57 AM	#8
RedlineRacer Zilvia FREAK! Join Date: Sep 2002 Location: Clemson, South Carolina Age: 40 Posts: 1,054 Trader Rating: (0) Feedback Score: 0 reviews	My intake manifold gasket was shot and I had similar problems. I could hear the air leak, just had a hard time finding it. Do you hear any air leaks?

09-07-2006, 03:47 PM	#9
HalveBlue Zilvia FREAK! Join Date: Mar 2004 Location: I'm somewhere where I don't know where I am! Posts: 1,549 Trader Rating: (0) Feedback Score: 0 reviews	Where is the smoke it coming from? Do these symptoms only occure during accelaration or idling, or both? Do your idle problems occur at start up or after the engine is warmed up? Are the symptoms sporadic or do they happen consistently. I'd suggest checking your timing and replacing your sparkplugs if they're fouled. Make sure there are no air leaks anywhere. Also check your throttle cable and throttle body. Make sure that they move freely and smoothly. But, in the end, you might just have bad piston rings (Or at least an oil leak somewhere). That would explain the black smoke. Anyway, happy hunting.

09-07-2006, 04:02 PM	#10
kaotic Zilvia Junkie Join Date: Jan 2005 Location: Las Vegas, NV Posts: 334 Trader Rating: (1) Feedback Score: 1 reviews	knowing what kind of motor would help also?

09-09-2006, 10:25 AM	#12
RacerBoy Join Date: Aug 2006 Location: El Paso Age: 38 Posts: 27 Trader Rating: (0) Feedback Score: 0 reviews	damn you guys are great ... thanks alot.. i found out that there were actually 2 problems a vaccum (damn u mech) and a dirty IAC valve. so i got it all fixed and my 240 is running as powerful as ever.. time to kick some 3000gt ass...(i dont hate, its only personal)