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Topic: Changed Cat still chirps....Update

in Forum: C3 Fuel, Emission Control, and Exhaust Systems

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Changed Cat still chirps....Update (1/16)
5/28/12 5:26pm

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Holland Patent, NY - USA

Vette(s):
#1 *1980 White, Red interior 14,000 mile #2 *1980 Red, Oyster interior 93,000 miles Resto project car, rebuilt to 383 stroker

Joined: 6/3/2008
Posts: 4421

We have finally had a few days of good weather so today I dropped the catalitic converter and put on a new Magnaflow Cat.

Took the car out for first run of the season.

It still has issues, as its shifting through the gears you can hear a chirping sound that follows the RPM slow chirp then faster as the RPM raises, shifts and then again slow chirp that raises with the RPM. I thought it may be a plugged cat creating backpressure.

Also still have a skip so looks like its remove the plug shields and change the plugs, and or wires.

When I backed the car in the garage it now has a whistle while in reverse, does not do it in drive or netural. ( vacume line? where?) I think mini me has possesed my vette.

It runs ~~fine~~ just rough.

Good news is I drew very little blood while changing the Cat, not to bad a job at all.

Evil Smile

ebo

|UPDATED|5/28/2012 2:26:37 PM (AZT)|/UPDATED|

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ebo

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Re: Changed Cat still chirps.... (2/16)
5/13/12 8:55pm

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Red Lion, PA - USA

Vette(s):
1974 White 350 Corvette, TH400 Automatic 1972 Tangerine /Go Mango Convertible 383 Stroker, 2004r Automatic

Joined: 10/27/2006
Posts: 1182

Ebo,
I would think if the noise is only there while in reverse it may be in the trans. I could be wrong here but I dont think the vacuum will change when in gear. If I remember correctly your vacuum is created by the engine, the only vacuum to a trans would be to a modulator and I am not sure yours has one. I am not that familiar with your year but vacuum is always there if it has a vacuum line to it, the gear should not effect it. Hopefully I am wrong and it is a vacuum leak. Much cheaper to fix those leaks! As for running rough, that could be plugs, wires or as you thought a vacuum leak.
Good Luck and keep us informed.
Rodney

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Re: Changed Cat still chirps.... (3/16)
5/13/12 9:19pm

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Flanders, NJ - USA

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1982 Black, ZZ4, Hooker Side Pipes, 3.55 Rear, Rebuilt & upgraded 700R4, All new suspension, brakes, & new Charcoal interior.

Joined: 1/27/2004
Posts: 2552

Make sure that nothing is hitting the drive shaft, that chirp sounds like it would be drive line after the trans. Since you were under there make you didn't accidently bend something that may be clipping the u-joint or something.

Good luck with it.

Dave

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Re: Changed Cat still chirps.... (4/16)
5/14/12 10:58am

yostusota
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York, PA - USA

Vette(s):
1969 daytona conv. all original 350 350 380 4 sp w/air..and hard top

Joined: 5/18/2010
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Check the vacuum modulator line...it may be leaking..there's a rubber piece on the trans then a metal line..it may be moving a little when you shift into reverse..it's on the PS rear of the trans.

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Re: Changed Cat still chirps.... (5/16)
5/14/12 11:49am

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Holland Patent, NY - USA

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#1 *1980 White, Red interior 14,000 mile #2 *1980 Red, Oyster interior 93,000 miles Resto project car, rebuilt to 383 stroker

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Posts: 4421

Thanks Rich, I'm depressed about missing the gathering so took a mental health day today to feel better.

I'm out under the car and think I found my skip, removed back two plugs on pass side of motor one is full of ash, next one has signs of ash. I'm going to pull them all and leave the plug shields off this time!

I'll start using the ethenal gas teatment going forward, only has 19K miles on it but maybe the guide seals are leaking a bit?

It runs fine on regular should I be using high test?

Also pulled the altenator off the rear bearing is growling, I have a guy to replace bearing and anything else it needs.

When it burnt out that coil on the road last year as soon as I replaced it the I felt that skip in the car. They said blue smoke was comming out the exhaust when it shut of at 65MPH that may have been the start of fouling the plugs Confused

Confused

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ebo

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Re: Changed Cat still chirps.... (6/16)
5/14/12 12:24pm

yostusota
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York, PA - USA

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1969 daytona conv. all original 350 350 380 4 sp w/air..and hard top

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The blue smoke is a mis fire...probably the bad plugs did this..and the skip..if it doesn't smoke at start up it's probably sticking rings...the ethanol won't be the culprit here so the additives won't help that..there are cleaners you can put in the cylinders that eat the carbon off the rings and loosen them up and seal tight but I don't know how the general guy would get his hands on it...I may have a few cans laying around I can mail to you though..might I suggest a leak down test and see where the leak is...yeah missing the gathering stinks but at least you can put new wires and plugs on it..get a set from Lectric limited..they are awesome! Let me know if you want that cleaner.

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Re: Changed Cat still chirps.... (7/16)
5/14/12 1:57pm

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Holland Patent, NY - USA

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#1 *1980 White, Red interior 14,000 mile #2 *1980 Red, Oyster interior 93,000 miles Resto project car, rebuilt to 383 stroker

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Posts: 4421

Thanks Rich, just got the rest of the plugs out, drivers side is easy the front two on pass are near impossible to get at.

Smoke was only when it shut down when the coil melted. Does not smoke that I can notice.

Only one plug was fouled with ash rest looked pretty normal. If I do have that one cylinder giving me trouble at least its easy to get to!

Evil Smile

ebo

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ebo

Re: Changed Cat still chirps....UPDATE (8/16)
5/28/12 5:16pm

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Holland Patent, NY - USA

Vette(s):
#1 *1980 White, Red interior 14,000 mile #2 *1980 Red, Oyster interior 93,000 miles Resto project car, rebuilt to 383 stroker

Joined: 6/3/2008
Posts: 4421

Heh had one good thing happen yesterday.....had Alt checked and there is nothing wrong with it, working just fine. He said with only 19k it would look like new inside, said bring it back when you have another 60K on it.

Evil Smile

ebo

|UPDATED|5/28/2012 2:16:16 PM (AZT)|/UPDATED|

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Re: Changed Cat still chirps.... (9/16)
5/28/12 5:21pm

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Holland Patent, NY - USA

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#1 *1980 White, Red interior 14,000 mile #2 *1980 Red, Oyster interior 93,000 miles Resto project car, rebuilt to 383 stroker

Joined: 6/3/2008
Posts: 4421

OK saved today to put the plugs back in the car, went in much easier than expected.

started it up and it sounded pretty good. Let it get warm and took it out for a spin, no hesitation, no skips, no chirping sound (have no clue how a bad plug would cause that).

Also when in reverse no whistle......so nice to have it running good again!

Evil Smile

ebo

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Re: Changed Cat still chirps....Update (10/16)
5/28/12 7:51pm

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Sykesville, MD - USA

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Good to hear, Al! You gotta get it all straightened out for the season! Hope to see you soon!

Barry

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Re: Changed Cat still chirps....Update (11/16)
5/28/12 8:31pm

yostusota
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York, PA - USA

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I just changed my plugs Sunday night..mine ran bad once it got hot..definitely a bad plug for me..glad yours is back up and running smooth..I feel a cruise coming on!

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Re: Changed Cat still chirps....Update (12/16)
5/28/12 8:45pm

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Holland Patent, NY - USA

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#1 *1980 White, Red interior 14,000 mile #2 *1980 Red, Oyster interior 93,000 miles Resto project car, rebuilt to 383 stroker

Joined: 6/3/2008
Posts: 4421

yostusota said: I just changed my plugs Sunday night..mine ran bad once it got hot..definitely a bad plug for me..glad yours is back up and running smooth..I feel a cruise coming on!

Your Good Rich! Just refreshed the Vette's at the beach. You should come up this year.....so much has changed in a year my friend!
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Re: Changed Cat still chirps....Update (13/16)
5/29/12 3:27am

yostusota
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York, PA - USA

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Date and place..I can't remember last year.

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Re: Changed Cat still chirps....Update (14/16)
5/29/12 12:16pm

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Holland Patent, NY - USA

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#1 *1980 White, Red interior 14,000 mile #2 *1980 Red, Oyster interior 93,000 miles Resto project car, rebuilt to 383 stroker

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Here you go Rich

https://www.c3vr.com/vrforums/message_go.asp?MID=417298&title=2012-vettes-the-beach

|UPDATED|5/29/2012 9:16:49 AM (AZT)|/UPDATED|

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Re: Changed Cat still chirps.... (15/16)
5/29/12 12:57pm

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ebo said: OK saved today to put the plugs back in the car, went in much easier than expected.

started it up and it sounded pretty good. Let it get warm and took it out for a spin, no hesitation, no skips, no chirping sound (have no clue how a bad plug would cause that).

Also when in reverse no whistle......so nice to have it running good again!

Evil Smile

ebo

Am it possible, Mr. Albo, that one(or more) of yer plugs were loose? A loose plug could cause the noises you were hearin...an engine miss could also create a chirp from an exhaust leak, if you have/had one.

Just throwing stuff out dere.... Wink

Wink

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Re: Changed Cat still chirps....Update (16/16)
5/29/12 2:16pm

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Holland Patent, NY - USA

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#1 *1980 White, Red interior 14,000 mile #2 *1980 Red, Oyster interior 93,000 miles Resto project car, rebuilt to 383 stroker

Joined: 6/3/2008
Posts: 4421

Joel did not notice any loose plugs, but the one was fouled fer sure, all I know is it's all good now and I hope to NOT have tweety in the car for a while......

Life Is Good!

Evil Smile

ebo

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