S13 Runs rough then dies after aem cold air intake install - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Clark W. Griswald · 08-22-2009, 01:13 PM

I just installed an AEM short ram air intake on my 93 240SX today. It ran perfect before the install and now it runs rough, the idle hovers, and steadily goes down until the engine dies. I was having problems with my car running very rough at startup due what what I believe was the catalytic converter being clogged. After beating the hell out of it with a hammer and laying on the throttle a few times it went away. Attched are two video clips. One is the engines characteristics while I lay on the gas pedal and the other is under the hood after the install. Sorry about the terrible quality and length of video, I only have a video recorder on my cellular phone. Any help would be great thanks.

YouTube - 0822091451

YouTube - 0822091452

projectRDM · 08-22-2009, 03:11 PM

You have a vacuum leak somewhere, or the MAF is not connected. There's nothing else you could do during an intake install to cause idle issues.

SoguRacing · 08-22-2009, 03:20 PM

Quote:

Originally Posted by projectRDM

You have a vacuum leak somewhere, or the MAF is not connected. There's nothing else you could do during an intake install to cause idle issues.

unless you you changed your intake filter to the element type that requires you to oil the filter such as k&n. the oil will gum up your maf sensor element and alter your maf reading to the ecu.

Clark W. Griswald · 08-23-2009, 06:13 PM

Im pretty positive my hoses are connected properly with no leaks and the MAF is definetely connected. It couldnt possibly be the previously clogged cat?

Clark W. Griswald · 08-23-2009, 06:43 PM

Ok I just checked out the plug for the MAF. It's a four pin female plug, but the far left prong is missing. Is it supposed to be missing to accept other model cars or did one of my prongs fall out and thats why my car is running so terrible? Can I just wire in another plug from another S13?

Spring Break '92 · 08-24-2009, 01:14 AM

Quote:

Originally Posted by Clark W. Griswald

Ok I just checked out the plug for the MAF. It's a four pin female plug, but the far left prong is missing.

Exactly, the fourth pin is vacant. Viewing the harness connector from the wiring side with wires facing you, the vacant pin slot will be on the far right. From left to right the first wire is the MAF signal wire, the second is ground, and the third is 12 volt power. Also check this thread, guy has similar issue: http://zilvia.net/f/tech-talk/269564...cks-power.html

Clark W. Griswald · 08-24-2009, 07:01 AM

When the MAF is unplugged the engine idles fine, but I can rev over 3k RPM. When I plugged the MAF back in the car died. Any ideas?

orion::S14 · 08-24-2009, 08:18 AM

Bad MAF.

Maybe a coincidence, maybe you knocked it around a little and now it's dead.

Buy a new (used) one...they can be had for $20.

If you strike out locally, search for one on Car-Part.com--Used Auto Parts Market (junk yard search engine)

- Brian

Clark W. Griswald · 08-24-2009, 09:49 AM

I have a donor car at my parents house that runs fine, Ill pull the MAF off that and get back to everybody.Thanks, and I hope this works...kinda need my car to get to work tomorrow morning.

Clark W. Griswald · 08-24-2009, 11:13 AM

I figured out what the problem was. I had the MAF on basically upside down and backwards. The pins in the MAF can only read air flow one way, and that was the opposite way in which I had the MAF positioned. All is as it should be with the new short ram on, boy do I feel like a horses patoot!

Spring Break '92 · 08-24-2009, 03:43 PM

Ah-hegh! Yea, you got to watch out for that. Theres an arrow on the MAF indicating air flow direction.

Clark W. Griswald · 08-26-2009, 07:57 PM

Theres one of those on my girlfriends vajayjay too, but that never stopped me from directing flow the other way.

08-22-2009, 01:13 PM	#1
Clark W. Griswald Join Date: Mar 2009 Location: Hampton Raods Age: 35 Posts: 40 Trader Rating: (0) Feedback Score: 0 reviews	S13 Runs rough then dies after aem cold air intake install I just installed an AEM short ram air intake on my 93 240SX today. It ran perfect before the install and now it runs rough, the idle hovers, and steadily goes down until the engine dies. I was having problems with my car running very rough at startup due what what I believe was the catalytic converter being clogged. After beating the hell out of it with a hammer and laying on the throttle a few times it went away. Attched are two video clips. One is the engines characteristics while I lay on the gas pedal and the other is under the hood after the install. Sorry about the terrible quality and length of video, I only have a video recorder on my cellular phone. Any help would be great thanks. YouTube - 0822091451 YouTube - 0822091452

08-22-2009, 03:11 PM	#2
projectRDM Post Whore! Join Date: Dec 2002 Location: Atlanta Age: 47 Posts: 13,812 Trader Rating: (12) Feedback Score: 12 reviews	You have a vacuum leak somewhere, or the MAF is not connected. There's nothing else you could do during an intake install to cause idle issues. __________________ FORMERLY R240NA Learn what's really going on and protect your assets now before they're gone forever: www.paypalsucks.com

08-24-2009, 08:18 AM	#8
orion::S14 Nissanaholic! Join Date: May 2003 Location: Orange Park, FL Posts: 1,665 Trader Rating: (0) Feedback Score: 0 reviews	Bad MAF. Maybe a coincidence, maybe you knocked it around a little and now it's dead. Buy a new (used) one...they can be had for $20. If you strike out locally, search for one on Car-Part.com--Used Auto Parts Market (junk yard search engine) - Brian __________________ www.KA24DEvelopment.com

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08-23-2009, 06:13 PM	#4
Clark W. Griswald Join Date: Mar 2009 Location: Hampton Raods Age: 35 Posts: 40 Trader Rating: (0) Feedback Score: 0 reviews	Im pretty positive my hoses are connected properly with no leaks and the MAF is definetely connected. It couldnt possibly be the previously clogged cat?

08-23-2009, 06:43 PM	#5
Clark W. Griswald Join Date: Mar 2009 Location: Hampton Raods Age: 35 Posts: 40 Trader Rating: (0) Feedback Score: 0 reviews	Ok I just checked out the plug for the MAF. It's a four pin female plug, but the far left prong is missing. Is it supposed to be missing to accept other model cars or did one of my prongs fall out and thats why my car is running so terrible? Can I just wire in another plug from another S13?

08-24-2009, 07:01 AM	#7
Clark W. Griswald Join Date: Mar 2009 Location: Hampton Raods Age: 35 Posts: 40 Trader Rating: (0) Feedback Score: 0 reviews	When the MAF is unplugged the engine idles fine, but I can rev over 3k RPM. When I plugged the MAF back in the car died. Any ideas?

08-24-2009, 09:49 AM	#9
Clark W. Griswald Join Date: Mar 2009 Location: Hampton Raods Age: 35 Posts: 40 Trader Rating: (0) Feedback Score: 0 reviews	I have a donor car at my parents house that runs fine, Ill pull the MAF off that and get back to everybody.Thanks, and I hope this works...kinda need my car to get to work tomorrow morning.

08-24-2009, 11:13 AM	#10
Clark W. Griswald Join Date: Mar 2009 Location: Hampton Raods Age: 35 Posts: 40 Trader Rating: (0) Feedback Score: 0 reviews	I figured out what the problem was. I had the MAF on basically upside down and backwards. The pins in the MAF can only read air flow one way, and that was the opposite way in which I had the MAF positioned. All is as it should be with the new short ram on, boy do I feel like a horses patoot!

08-24-2009, 03:43 PM	#11
Spring Break '92 Zilvia Member Join Date: Dec 2007 Location: unconcious on Daytona Beach Posts: 180 Trader Rating: (1) Feedback Score: 1 reviews	Ah-hegh! Yea, you got to watch out for that. Theres an arrow on the MAF indicating air flow direction.

08-26-2009, 07:57 PM	#12
Clark W. Griswald Join Date: Mar 2009 Location: Hampton Raods Age: 35 Posts: 40 Trader Rating: (0) Feedback Score: 0 reviews	Theres one of those on my girlfriends vajayjay too, but that never stopped me from directing flow the other way.