Home page
  Home Page   Contact Us   Our History   Advertise with Us   Sponsor List   Link to Us   Compare Levels   Member Agreement   Privacy Policy   About C3VR
  Community Forums   Active Threads   Forum Search   Top Posters List   Private Messenger   C3VR Email System   C3 Corvette Quiz
  Members Vettes & Pictures   Member Stories   Member Stats   Real Time Member Map   Member Search   Lifetime Member List   Member Calendar Entry Form   Who's Online
  C3 Registry Data   C3 Corvette Statistics   C3 Corvette Tips & Tricks   C3 Corvette How-Tos   Corvette Club Listing   Corvette Event Listing   Mechanic Directory   Corvette VIN Decoder   Save the Wave   Corvette Emblem History   C3 Corvette Birthday Calculator   C3 Corvette Build Dates   Corvette Parts Illustration Catalog   Shark Bytes - Online
  C3 Corvette Parts Auctions on eBay   Corvette Books   C3VR In-Stock Apparel & Accessories   C3VR Member Name Badges   C3VR Custom Apparel & Accessories @ Zazzle   C3VR Window Stickers   C3VR Member Deals & Discounts   C3VR Member Calendars   Shop Amazon.com
☰
SPONSOR AD

Topic: 82 engine issues

in Forum: C3 Engines

Already a Member? Click Here to Login

82 engine issues

Posted: 12/5/08 10:18am Message 1 of 11
82RedRedVette
Former Member
Send PM
Mount Airy, GA - USA
Joined: 11/4/2007
Posts: 16
Vette(s): 1982 red/red fully equiped 34k original miles delivered to GA and still in same state 3rd owner

Okay all of the crossfire owners... gather round!

My 82 with 35k miles starts up fine and has the high idle (1200-1500) to begin the warm up cycle, but then after 30 seconds, the idle dies instantly to 500 and stumbles like it's loading up! I can bring the gas manually back up to 1200 for about a minute and it stays there by itself. It continues on its own until closed loop begins and idle goes to 650 where it runs fine and smooth. Any clue why it dies?

Also, the other day I drove to town but noticed a shutter so bad that I had to pull over. It wouldn't take power and the headlights opened and closed by themselves!? I just knew a vaccum hose came lose... pulled the air cleaner, checked all the hoses but found all to be ok. This took about 10 minutes, so I put the cleaner back on, started up  and idled fine! I turned the highlights on and everything checked out. I drove it home to continue the hunt for my ghost but the car ran as good as it could. No stumble, no headlight blinking and plenty of power!

I got home and let the car cool down (30 minutes) and tried again! It started fine, high idle, died after 30 seconds, warmed up with gas pedal and drove off. After 5 miles the shutter started again, no power and headlights started to open and close by themselves! Stopped for 15 minutes, and it drove like a bat out of hell home again.

Any possible clue to my ghost? I have new O2 sensor, EGR, IAC's, plugs and wires, thermavac on air cleaner, MAP, and coolant sensor! It ran like new until I replaced the brake booster this summer! I can't imagine what that had to do with this!?

Any comments would be appreciated.



SPONSOR AD:: (Our Sponsors help support C3VR)

82 engine issues

Posted: 12/5/08 10:31am Message 2 of 11
Profile Pic
dwright
Former Member
Send PM
Victor, NY - USA
Joined: 7/12/2004
Posts: 6841
Vette(s): 2004 Commemorative Edition Coupe, Auto w/HUD. 13K miles in 2015. Sold 1982 Red Coupe
WOW, that's a new one.
Our early computer control and vacuum can cause problems, but I never heard of that one.
Did you get the check engine light?
Can you check for trouble codes?
Did the engine stall when you pulled over?
Could it be fuel pump?



 
Save the Wave!
Support the National Corvette Museum   

82 engine issues

Posted: 12/5/08 11:02am Message 3 of 11
Profile Pic
Adams' Apple
Lifetime MemberLifetime Member
Moderator
Send PM
Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas
I'd venture a guess that your EGR valve is stuck/sticking open.
You may also have an issue with one of the IAC(idle air control) motors. If it gets hung open too far, it acts just like a really bad vacuum leak, which could cause the headlight issues, and the rough running.
I'd find someplace to get it scanned for possible codes first, then go from there.


Joel Adams
C3VR Lifetime Member #56    
My Link


(click for Texas-sized view!)             NCRS

"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"

82 engine issues

Posted: 12/5/08 12:35pm Message 4 of 11
Profile Pic
crossfire1982
Former Member
Send PM
Cramerton, NC - USA
Joined: 8/22/2006
Posts: 1094
Vette(s): black 1982 coupe slate gray interior, 350 crossfire, 1985 fuel pump, Steeroids R&P conversion
Just a shot in the dark but check the vacuum check valve on the brake booster.


82 engine issues

Posted: 12/5/08 12:36pm Message 5 of 11
82RedRedVette
Former Member
Send PM
Mount Airy, GA - USA
Joined: 11/4/2007
Posts: 16
Vette(s): 1982 red/red fully equiped 34k original miles delivered to GA and still in same state 3rd owner
I use WinALDL to scan for codes and watch for sensor information with NO codes are present or stored and I have an 85 fuel pump to install with a new sending unit. I'm replacing the sending unit anyway since it sticks giving false readings to the guage. The car was in storage for 5 years and thats why I replaced all the sensors including the IAC's, EGR, etc. I'm wondering if some of the new parts are ok!? I have another new set of IAC's along with new distributor cap and rotor if needed.
If it's going to be a new "never heard that before" kind of problem, then leave it to me to get it!



82 engine issues

Posted: 12/5/08 12:44pm Message 6 of 11
82RedRedVette
Former Member
Send PM
Mount Airy, GA - USA
Joined: 11/4/2007
Posts: 16
Vette(s): 1982 red/red fully equiped 34k original miles delivered to GA and still in same state 3rd owner
Just seen the post on the brake booster filter! Come to think of it, when I went to pull over with the shuttering, I almost went through the windshield when I mashed the brakes! The brakes were super sensitve and after the car ran fine again on the way home, the brakes were back to normal feel.
How do you check the filter? One way direction?


82 engine issues

Posted: 12/5/08 5:49pm Message 7 of 11
Profile Pic
crossfire1982
Former Member
Send PM
Cramerton, NC - USA
Joined: 8/22/2006
Posts: 1094
Vette(s): black 1982 coupe slate gray interior, 350 crossfire, 1985 fuel pump, Steeroids R&P conversion

There is a filter and a check valve.  The "check valve" is actually attached to the front of the booster and the big vacuum hose from the engine connects to the check valve.   It looks like just a plastic elbow but is actually a valve.  There is a "filter" in the line also but closer to the engine.  Since the booster works on vacuum the check valve allows air to travel only one way, kind of like the check valve on the headlight system.  Since the rough running may be vacuum related AND you recently replaced the booster, it wont hurt to check the valve to see if its working. Those with far more knowledge than I have here could say if that could be causing the problem.




82 engine issues

Posted: 12/6/08 8:32am Message 8 of 11
G_dogg
Former Member
Send PM
Ashburn, VA - USA
Joined: 7/25/2008
Posts: 25
Vette(s): Blue 1982 Coupe
You are not the only one that gets "never heard of before" problems. I still have not found my stalling problem from this summer. But it has not happened again. I've gotten advice as simple as change the battery cables/tighten battery terminals to check every fusable link on the car. Lately, it is brake problems!
 
Good luck!



82 engine issues

Posted: 12/6/08 6:33pm Message 9 of 11
80c-3L82vette
Former Member
Send PM
jasper, GA - USA
Joined: 11/29/2008
Posts: 22
Vette(s): 1980 L-82
ok to check the valve on the booster you take it off and clean it of course and suck on the side going to the motor and you should ba able to draw air trough it now turn it arond and do the same thing you should not be able to suck any air trough it but i dont think this is your problem with the stalling as long as the engine is running you will have constant flow any way on the booster the check valve only holds vacume for stopping in low vacume cases such as engine stalling i wthink the reason your brakes went super strong was the your idle air ( indle controll motor ) was sticking and caused the vacume to change in the manafold i would try taking it out and cleaning it if it was your egr you would be loosing vacume lossing power and using more gas i would almost bet you have trash or carbon build up on the pluger comming out of the idle motor try it let us know if it works i am not always right but i have been doing this for over 20 yrs and it is a common problem with throttle bodys it is the only thing i can think of that would increase the vacume enough to supercharge the brakes like that


82 engine issues

Posted: 2/9/09 12:02pm Message 10 of 11
82RedRedVette
Former Member
Send PM
Mount Airy, GA - USA
Joined: 11/4/2007
Posts: 16
Vette(s): 1982 red/red fully equiped 34k original miles delivered to GA and still in same state 3rd owner
Just an update to this post... found the ghost's that haunted my crossfire! First, the reservior tank for the headlights wouldn't hold vacuum and was causing the shutter to the engine while driving and popping the lights to open and close! The gasket around the inlet ports on top was leaking in one spot. RTV sealant did the trick there! Second I found that one of the new IAC motors I installed the first of this year went bad or was bad to start. It wouldn't respond to the demands of the ECM and would stick closed (pulled in) so the TB was wide open sucking air all the time. I always have two spares so a quick exchange fixed that! The car idles smooth... has that nice programed high cold start idle down to normal traffic light idle!
Did some other service to the car these last few weeks and then ripped the old carpet out... installed dynamat front and rear with new seats and new carpet throughout. I finally took it for a drive today! What a difference in an engine that is tuned, an interior that is almost sound proof (if you can... install dynamat, no tin can sound anymore!!!) and the new car smell all over again.
So the moral to this story... never trust new parts and never think it's just one thing gone wrong!
Kuddo's to the CF's. 



in Forum: C3 Engines


SPONSOR AD: (Our Sponsors help support C3VR)