SR20DET irdle problems - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

teamcapsule · 10-22-2002, 04:35 AM

I drive a European S14 which has a SR20DET and I've been having problems with my idle. Tonight I have taken a closer look to come up with a better description of the problem.

Here's what I've come up with:

The engine is already warm and it idles at 800rpm. But after a half a minute or so the idle will drop to about 600rpm, at which point the exhaust will spew out some dark smoke.

This drop in rpm will last about 5 seconds, after which the idle will climb back up to 800rpm with no visible (colored) smoke at all.

And the cycle repeats itself.

What could be the problem?  I just hope it won't be too expensive to fix.

Foxcolt · 10-22-2002, 08:34 AM

What type of BOV do you have? Sounds like a classic case of atmospheric BOV staying a little open.

Jed <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/devil.gif" border="0" valign="absmiddle" alt=':devil:'>

teamcapsule · 10-22-2002, 08:45 AM

I have an HKS SSQV... I've had it for about a year now and didn't start having problems until about 3 months ago. But I'll try adjusting the screw of the BOV...

Could it be that the lambda sensor is faulty? Or some kind of blown gasket?

Foxcolt · 10-22-2002, 10:28 AM

Maybe a small boost leak, however you would also notice that a lot more. You'd have different problems also.

If you 02 sensor was bad you'd run rich however I doubt that you would be having those idle problems.

How is it driving wise?

For quicker response email me at [email protected]

Jed <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/devil.gif" border="0" valign="absmiddle" alt=':devil:'>

10-22-2002, 04:35 AM	#1
teamcapsule Leaky Injector Join Date: Sep 2001 Posts: 147 Trader Rating: (0) Feedback Score: 0 reviews	I drive a European S14 which has a SR20DET and I've been having problems with my idle. Tonight I have taken a closer look to come up with a better description of the problem. Here's what I've come up with: The engine is already warm and it idles at 800rpm. But after a half a minute or so the idle will drop to about 600rpm, at which point the exhaust will spew out some dark smoke. This drop in rpm will last about 5 seconds, after which the idle will climb back up to 800rpm with no visible (colored) smoke at all. And the cycle repeats itself. What could be the problem?  I just hope it won't be too expensive to fix. __________________ 1995 (Euro-spec) s14, perpetual moneypit

10-22-2002, 08:34 AM	#2
Foxcolt Zilvia FREAK! Join Date: Apr 2002 Location: Northern VA Posts: 1,264 Trader Rating: (0) Feedback Score: 0 reviews	What type of BOV do you have? Sounds like a classic case of atmospheric BOV staying a little open. Jed <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/devil.gif" border="0" valign="absmiddle" alt=':devil:'> __________________ Driftec www.midatlantic240sx.com

10-22-2002, 08:45 AM	#3
teamcapsule Leaky Injector Join Date: Sep 2001 Posts: 147 Trader Rating: (0) Feedback Score: 0 reviews	I have an HKS SSQV... I've had it for about a year now and didn't start having problems until about 3 months ago. But I'll try adjusting the screw of the BOV... Could it be that the lambda sensor is faulty? Or some kind of blown gasket? __________________ 1995 (Euro-spec) s14, perpetual moneypit

10-22-2002, 10:28 AM	#4
Foxcolt Zilvia FREAK! Join Date: Apr 2002 Location: Northern VA Posts: 1,264 Trader Rating: (0) Feedback Score: 0 reviews	Maybe a small boost leak, however you would also notice that a lot more. You'd have different problems also. If you 02 sensor was bad you'd run rich however I doubt that you would be having those idle problems. How is it driving wise? For quicker response email me at [email protected] Jed <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/devil.gif" border="0" valign="absmiddle" alt=':devil:'> __________________ Driftec www.midatlantic240sx.com