GIINK

1984 Mazda RX7, 92,000 original miles. Car has been well taken care of in general. Hi Everyone! Maybe someone might have an idea to what is happening... recently I've noticed a "chirping" type of sound coming from the engine compartment when accelerating from first to second gear... sometimes from second to third. The sound goes away once the vehicle is up to speed in gear. It only lasts for a few seconds and then it's gone. Could it be a belt or something similar? Maybe some one has had a similar experience? Would love to get an idea what's going on.


Thanks, David

t_g_farrell

iTrader: (1)

I can get mine to chirp in 1st, 2nd and 3rd gear sometimes Of course its the tires making the noise on my car.

Seriously, it could be your belt slipping on the alternator or water pump. Might be a loose belt(s) or a change in resistance of the alternator or water pump. Check you belts first and then trouble shoot from there.

Also check out the threads that show up below your thread. One of em may help you as well. Plus searching.

aussiesmg

iTrader: (1)

Sounds like the infamous shutter valve, do a search it is easiest to simply disconnect it.

Cascadia

Rev the engine up quickly while sitting with the car in neutral. If you get a rapid chirping (or what may sound like a scream), Then I would have to guess it is the belt.

GIINK

Thanks so much for the info guys... I really appreciate your help!


David

85_rx7_12a

your driving a rx-7 get used to it it comes from the tires spinning


but on the other hand belts most likely

GIINK

Hi Guys, checked the belts and they all look good and feel fairly snug. I DO NOT get the "chirping" sound by sitting and accelerate hard while idling. Only hear it briefly when I'm accelerating. Little chirping noise when I put my foot down hard and shift from gear to gear and then it's gone. Not constant in anyway. It's just really annoying me.

Any other thoughts?

AverageJoe

iTrader: (1)

Lmao. Dude, are you serious? That's just your tires spinning. If you want it to stop you just have to quit hammering the throttle after you shift. Learn to ease on to the throttle instead of just flooring it. Your clutch will also last longer if you learn to ease the throttle.

blackdeath647

iTrader: (2)

haha that was funny!!! uh yeah it's most likely your tires, any car would do that if you push it hard enough...anyways just to make sure, while shifting pay close attention towards the shift boot (if possible lift the rubbert part off so that you can hear better) this is to make sure it's in fact your tires barking and not your trany ******* up.

flight_of_pain

have you heard detonation before? under acceleration load it sounds like a metallic ping/chirp.


isaac

GIINK

NO, Thanks... but it's not the tires spinning! I believe I can tell the difference on that one. Sounds like it's coming from the left side of the engine compartment (sitting in the car). I meant when I accelerate through the gears... not putting the pedal to the metal.

Why can't I hear it if I press down on the gas while idling... only seems under a load is when I can hear it. The transmission is fine.

Sounds like a light chirp for about 3 seconds and then it's gone until I shift into the next gear... same thing.

Need more help on this one. Anybody?

Ovid213

Well, first you need to figure out where the noise is coming from. This is obviously a bit more difficult, since you can't replicate the symptom at idle. What you need to do is remove the hood, and get a nimble assistant, possibly a neighbor's kid or a local midget, to sit in the engine bay and hang on for dear life as you accelerate through the gears. If you have a mechanic's stethoscope, you could let him wear that as well. With any luck, after repeating this several times, he should be able to direct you to the physical location of the noise.
In all seriousness- if it seems related to load, I would first check your ign timing, then examine intake related stuff (shutter valve, rats nest parts, etc.).

RX-7 Chris

iTrader: (19)

It is probably the belt, sometimes they look good and they still squeel under a load. That is the cheapest thing to start with. Check your cap and rotor then I would look into the shutter valve.

PS: don't drive around with someone sitting in the engine bay, not like you actually would.

brandon davis

iTrader: (3)

I have the same problem.............only when my trailing ignition is hooked up!!!!!!!! I for the life of me havent made the time to figure out how to rid this sound. Disconnect your trailing ignition(seperate your connection on the aft side of your distributer(your tach will no longer work) then see if it does the same thing.

brandon davis

iTrader: (3)

FWIW i have checked everything stated above and i dont have a shutter valve and am running a dual alt belt pully that is good and taught. Originally i thought it was the mallory4309 FPR poppet boucing up and down due to fuel pressure fluctuation but learned that this started when i replaced a faulty trailing ignitor cuz i had no tach. Trailing off no odd noises, trailing on= odd noises. I too am open to suggestions.......any really. Not to hyjack thread or all but since the topic was brought up and mine sounds the same.......chirping some metallic noise. I dont know?????

blackdeath647

iTrader: (2)

we really need to know where the sound is coming from, and what type of sound really, chirping, whistling, grinding....idk if there's a way to be more specific, but try plz. ... it could be from maybe your breaks grinding or something, to vacuum leak ..idk...try to tell us where the sound is coming from if possible i know its hard.

brandon davis

iTrader: (3)

engine!

brandon davis

iTrader: (3)

for me its an inconsistent only under load with trailing ignition hooked up so i know its ignition related but havent found out what yet. Im going to try swapping to a diamond coil from my MSD since i noticed the MSD was dented at the bottom, although it made very strong consistent spark at the coil and out the wires.

GIINK

I have a friend who switched out my engine with another stock 12A and the "chirping" sound has been taken care of. The car has never run better. I would also suggest this method to the hijacker above.

jfeliciano15

iTrader: (1)

I have this problem as well and I narrowed it down to the water pump it self. I sprayed the inner side of the pulley with litheum grease but after the grease dries up due to the heat the engine generates the chirpping squeel starts all over again. I imagine that the bearing inside the water pump is dry. (this is just a guess).

NCross

iTrader: (18)

Air pump? Even if the belts appear to be good they can slip under load. Have you removed any components? Air pump, PS, clutch fan, AC? Removing some of these can cause the balance of the belt rotation to be off.

jfeliciano15

iTrader: (1)

NCross is right and he hit it right on the head because the chirpping did start as soon as I removed the smog pump. But now do I replace the belt or put the pump back on?

NCross

iTrader: (18)

There is not enough tension since the pump was removed. Put it back on and see if that helps. It only takes a few minutes. Does it only happen between say... 2000-4000 RPM?

jfeliciano15

iTrader: (1)

Yes it does happen between 2000 and 4000 rpms and dam is it anoying

gsl-se addict

iTrader: (3)

brandon davis: I bet your front pulley is on wrong or your plug wires are crossed. Talk to or look up a post by aws140 about this issue. Same thing and was worse with his MSD connected. He thought the timing was spot on and wires were all correct. He the dicovered the front pulley was installed incorrectly so his timing was way off.

In general, this type of noise can come from a lot of things. Belt or timing are both pretty common. Sometimes even withthe airpump and everything on there, you still can get the belt noise. Either slips due to age or the clutch on the radiator fans locks up creating a large drag on the system.