Idle and Vac problem SR - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

driver11324 · 06-08-2008, 04:52 PM

I know that the vacuum should be at 20 in.Hg at idle, but with my car its around 10 in.Hg. I do have cams, but they aren't anything too aggressive (264 in/ex step 1). Sometimes the vacuum goes below 10 in.Hg during idle. The only time I see 20 in.Hg is after I give it throttle and the RPM's go 1200-1400 then it drops to idle and so does the vacuum. It never really bothered me until the other night and now the problem is just annoying me. I am going to do a boost leak check in a little, but are there any other things that I should check?

Ninjabread · 06-10-2008, 07:51 PM

Hmm I have the same issue with my car, same cams but step 2, and my vacuum at idle sits close to 10 all the time...

driver11324 · 06-10-2008, 09:26 PM

I did a boost leak test and found that my MBC was leaking, so I ordered an AEM Truboost. Hopefully that will fix some of it.

Ninjabread · 06-10-2008, 09:28 PM

Oh ok good to know!

I'll try looking for vac leaks on mine too.

06-08-2008, 04:52 PM	#1
driver11324 Zilvia Member Join Date: Jan 2006 Location: Long Island Posts: 205 Trader Rating: (6) Feedback Score: 6 reviews	Idle and Vac problem SR I know that the vacuum should be at 20 in.Hg at idle, but with my car its around 10 in.Hg. I do have cams, but they aren't anything too aggressive (264 in/ex step 1). Sometimes the vacuum goes below 10 in.Hg during idle. The only time I see 20 in.Hg is after I give it throttle and the RPM's go 1200-1400 then it drops to idle and so does the vacuum. It never really bothered me until the other night and now the problem is just annoying me. I am going to do a boost leak check in a little, but are there any other things that I should check?

06-10-2008, 07:51 PM	#2
Ninjabread Post Whore! Join Date: Jul 2005 Location: Ottawa, Ontario Age: 36 Posts: 3,492 Trader Rating: (2) Rides Gallery: Ninjabread Feedback Score: 2 reviews	Hmm I have the same issue with my car, same cams but step 2, and my vacuum at idle sits close to 10 all the time... __________________ 613DriftWerks.ca

06-10-2008, 09:28 PM	#4
Ninjabread Post Whore! Join Date: Jul 2005 Location: Ottawa, Ontario Age: 36 Posts: 3,492 Trader Rating: (2) Rides Gallery: Ninjabread Feedback Score: 2 reviews	Oh ok good to know! I'll try looking for vac leaks on mine too. __________________ 613DriftWerks.ca

06-10-2008, 09:26 PM	#3
driver11324 Zilvia Member Join Date: Jan 2006 Location: Long Island Posts: 205 Trader Rating: (6) Feedback Score: 6 reviews	I did a boost leak test and found that my MBC was leaking, so I ordered an AEM Truboost. Hopefully that will fix some of it.