Is this sound normal...

85rx-7gsl-se · 11-19-2013, 04:48 PM

I hear this chugging/pulsing sound. It doesnt really sound like an exhaust leak. Since I am a rx8 noob, figured I would ask the experts.

JL1RX7 · 11-19-2013, 06:14 PM

All the nipples on the airbox/maf on? SSV in decent shape? Hose off the air pump good?

85rx-7gsl-se · 11-19-2013, 06:42 PM

I haven't torn into it. Just figured I would make sure it wasn't a normal sound first.

JL1RX7 · 11-19-2013, 06:48 PM

It didn't sound normal. No codes or anything else crazy?

85rx-7gsl-se · 11-19-2013, 07:17 PM

Only code it had was a rotor 1 misfire. Cleared code and fired it up a few times with no codes coming back.

JL1RX7 · 11-19-2013, 07:20 PM

Still the strange surging sounds?

85rx-7gsl-se · 11-19-2013, 08:15 PM

Yep. Just picked to car up Saturday. Aside from a somewhat rough idle, seems to run okay.

JL1RX7 · 11-19-2013, 08:23 PM

I would do the normal eight stuff. Change plugs and coils. Check cat, do compression check. Save to rebuild motor.

reddozen · 11-19-2013, 08:46 PM

These were posted on 8 club about the misfire and rough idle.

Rough Idle PDF:
http://www.rx8club.com/attachments/s...ollingidle-pdf

Misfire Diagnosis:

djmtsu · 11-20-2013, 07:00 AM

I'm not sure that is the procedure for an RX-8.

The 'official' Mazda dealer procedure is: 'Runs rough or does not start? Replace engine'

Super Cereal

85rx-7gsl-se · 11-20-2013, 07:06 AM

Well I plan to start off with plugs/wires/coils since no idea when they were last changed. The car starts in about 2 seconds and idles. Previous owner said Mazda told him rotor 1 is dead, but I have a hard time believing that.

I was just wondering what this weird pulsing air noise is.

DJ: shoot my that quote on the coils and I will send $$$.
.

85rx-7gsl-se · 11-20-2013, 07:09 AM

Quote:

Originally Posted by JL1RX7

I would do the normal eight stuff. Change plugs and coils. Check cat, do compression check. Save to rebuild motor.

I have the money for the rebuild already haha. Just want to confirm its low comp before I dump the $$$ into it.

djmtsu · 11-20-2013, 07:12 AM

Yeah yeah yeah.

Pete_89T2 · 11-20-2013, 11:14 AM

I'm no RX8 expert, but that sounds similar to what a leaking air pump/ACV plumbing sounds like on an FC. Do '8s still have air pumps & ACV's for emissions? If so, give the associated hoses & plumbing a good visual inspection for cracks/leaks.

FerociousP · 11-20-2013, 07:18 PM

Airpump is electric and only runs during initial startup, and blows directly into exhaust manifold through a (separate from engine) ACV type valve

11-19-2013, 08:46 PM	#9
reddozen Gold Wheels FTW Join Date: Mar 2008 Posts: 744 Rep Power: 18	These were posted on 8 club about the misfire and rough idle. Rough Idle PDF: http://www.rx8club.com/attachments/s...ollingidle-pdf Misfire Diagnosis: __________________ My Cars: 1974 RX4 Coupe 1991 FC3S RX7 - Sold 2003 ZZW30 MR2 (Rotary swap after RX8) 2004 SE3P RX8 (20B Swap in the works) Last edited by reddozen; 11-19-2013 at 08:55 PM.

11-20-2013, 07:00 AM	#10
djmtsu My minds tellin' me no... Join Date: Feb 2008 Location: Murfreesboro, TN Posts: 4,043 Rep Power: 22	I'm not sure that is the procedure for an RX-8. The 'official' Mazda dealer procedure is: 'Runs rough or does not start? Replace engine' Super Cereal __________________ 1976 Mazda Cosmo RX-5 1976 Mazda Cosmo RX-5 2003 Toyota Tundra TRD 2015 Toyota 4Runner SR5

11-20-2013, 07:12 AM	#13
djmtsu My minds tellin' me no... Join Date: Feb 2008 Location: Murfreesboro, TN Posts: 4,043 Rep Power: 22	Yeah yeah yeah. __________________ 1976 Mazda Cosmo RX-5 1976 Mazda Cosmo RX-5 2003 Toyota Tundra TRD 2015 Toyota 4Runner SR5

11-20-2013, 07:18 PM	#15
FerociousP I-had-a-bad-experience... Join Date: Feb 2008 Location: M'boro Posts: 1,046 Rep Power: 19	Airpump is electric and only runs during initial startup, and blows directly into exhaust manifold through a (separate from engine) ACV type valve __________________ '15 Juke Nismo '06 MX-5 GT SOLD '04 S Silver RX-8 GT Track Day Use SOLD '90 Black TII vert w/ Sprint RE stock port/turbo DD dyno (242.6whp@5500rpm @12psi 8psi@redline) and (250ftlbtq@4800rpm @13psi) SOLD '89 GTUs 6p TII SOLD, '87 sport SOLD, '79 SA stock SOLD '91 B2600i 4x4 w/ Rx-8 LSD SOLD

11-19-2013, 06:14 PM	#2
JL1RX7 Rotary Fanatic Join Date: Feb 2008 Location: Front Royal, VA Posts: 487 Rep Power: 18	All the nipples on the airbox/maf on? SSV in decent shape? Hose off the air pump good?

11-19-2013, 06:48 PM	#4
JL1RX7 Rotary Fanatic Join Date: Feb 2008 Location: Front Royal, VA Posts: 487 Rep Power: 18	It didn't sound normal. No codes or anything else crazy?

11-19-2013, 07:20 PM	#6
JL1RX7 Rotary Fanatic Join Date: Feb 2008 Location: Front Royal, VA Posts: 487 Rep Power: 18	Still the strange surging sounds?

11-19-2013, 08:23 PM	#8
JL1RX7 Rotary Fanatic Join Date: Feb 2008 Location: Front Royal, VA Posts: 487 Rep Power: 18	I would do the normal eight stuff. Change plugs and coils. Check cat, do compression check. Save to rebuild motor.

11-20-2013, 11:14 AM	#14
Pete_89T2 Lifetime Rotorhead Join Date: Apr 2010 Location: Elkton, MD Posts: 874 Rep Power: 16	I'm no RX8 expert, but that sounds similar to what a leaking air pump/ACV plumbing sounds like on an FC. Do '8s still have air pumps & ACV's for emissions? If so, give the associated hoses & plumbing a good visual inspection for cracks/leaks.