need help, searched threads, bad idle surge problem - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

koukipilot · 08-27-2008, 01:32 PM

Ok, here are the basics, I'm trying to get my friends S14 w/ S13sr20det to idle well enough so we can get it tuned on the dyno. He is using Apex power FC D-jetro for fuel management so no maf, and Apex elec. boost controller. I looked for vacuum leaks and couldn't find any but the idle surges like crazy within a minute after startup, 600rpm to 1000rpm, then eventually dies. We reset the CAS at least a dozen times to 15 deg. already, checked all the injectors to see if they're all firing, and they all are ( at 48% duty cycle ). Anyone have this problem? Any suggestions would be greatly appreciated and thank you very much for your expertise.

SexPanda · 08-27-2008, 01:40 PM

My bro's galant vr4 did the same thing, and it turns out he was missing an o-ring on his #1 inejector.

Its worth a try, see if your orings are there.

koukipilot · 08-27-2008, 01:48 PM

injector o-rings are good just put in new ones on the RC 750cc injectors. The 1st thing I thought was timing, then AAC valve, then vacuum leak. We reset the timing a dozen times, this is the second AAC valve ( thats what Japan calls it ) we call it AIC valve, and been looking for a vacuum leak for days and still the same problem. Any other ideas? Once again, thanks for all the input.

SexPanda · 08-27-2008, 01:57 PM

hmmm...

Well, I'd say connect it to the computer, but seeing as how its OBD1, and Japanese, that'd be a stretch. Have you checked your brake booster? Disconnect the vacuum line from the booster, and hold it closed with your finger. It could be a bad booster. I've seen that a few times.

koukipilot · 08-27-2008, 02:03 PM

Will try the booster test, sounds like a good idea...thank you

08-27-2008, 01:40 PM	#2
SexPanda Post Whore! Join Date: Jun 2007 Location: Where ever there is free beer Posts: 3,239 Trader Rating: (0) Feedback Score: 0 reviews	My bro's galant vr4 did the same thing, and it turns out he was missing an o-ring on his #1 inejector. Its worth a try, see if your orings are there. __________________ BRAND NEW GReddy PRofec E-01 EBC for sale, Cheap!

08-27-2008, 01:57 PM	#4
SexPanda Post Whore! Join Date: Jun 2007 Location: Where ever there is free beer Posts: 3,239 Trader Rating: (0) Feedback Score: 0 reviews	hmmm... Well, I'd say connect it to the computer, but seeing as how its OBD1, and Japanese, that'd be a stretch. Have you checked your brake booster? Disconnect the vacuum line from the booster, and hold it closed with your finger. It could be a bad booster. I've seen that a few times. __________________ BRAND NEW GReddy PRofec E-01 EBC for sale, Cheap!

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08-27-2008, 01:32 PM	#1
koukipilot Join Date: Sep 2005 Location: Hawaii Posts: 28 Trader Rating: (0) Feedback Score: 0 reviews	need help, searched threads, bad idle surge problem Ok, here are the basics, I'm trying to get my friends S14 w/ S13sr20det to idle well enough so we can get it tuned on the dyno. He is using Apex power FC D-jetro for fuel management so no maf, and Apex elec. boost controller. I looked for vacuum leaks and couldn't find any but the idle surges like crazy within a minute after startup, 600rpm to 1000rpm, then eventually dies. We reset the CAS at least a dozen times to 15 deg. already, checked all the injectors to see if they're all firing, and they all are ( at 48% duty cycle ). Anyone have this problem? Any suggestions would be greatly appreciated and thank you very much for your expertise.

08-27-2008, 01:48 PM	#3
koukipilot Join Date: Sep 2005 Location: Hawaii Posts: 28 Trader Rating: (0) Feedback Score: 0 reviews	injector o-rings are good just put in new ones on the RC 750cc injectors. The 1st thing I thought was timing, then AAC valve, then vacuum leak. We reset the timing a dozen times, this is the second AAC valve ( thats what Japan calls it ) we call it AIC valve, and been looking for a vacuum leak for days and still the same problem. Any other ideas? Once again, thanks for all the input.

08-27-2008, 02:03 PM	#5
koukipilot Join Date: Sep 2005 Location: Hawaii Posts: 28 Trader Rating: (0) Feedback Score: 0 reviews	Will try the booster test, sounds like a good idea...thank you