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Topic: WHAT DID I WRONG ?

in Forum: C3 Engines


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WHAT DID I WRONG ?

Posted: 3/14/06 6:15pm Message 1 of 184
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Belgium
Joined: 1/5/2006
Posts: 774
Vette(s): 350/350 T-top 1970 Cortez silver -blue interior
ok guys , now i'm a bit ,

the car was doing very well but read forums about timing etc. So i played changing :
- breaker points , heavy duty
- adjustable vacuum advance
- Accel kit mechanical advance , sets of springs to choose.
- new spark plugs

tryed a lot of settings but never better than original.Worse  !always some pufpufs in acceleration.

so i dicided : back to original , all.
Did that but the pufpufs are stiil there ! I can only accelerate up to 3000 rpm and slowly otherwise there are more pufpufs than rpm's.??????????????  What did i wrong ????????????

On the carb ( a Holley 600  double pumper ) i only adjusted the fuel level in the cowls : raised fuel to bottom sight holes ) and  both idle screws  optimum with  vacuum  gauge.I even now returned  fuel level  in cowls as before  ( 1/2 turn  of the screw above , first anticlockwise , now again clockwise ) and see the fuel a bit beneath the sight holes.

Just inspected the spark plugs and wonderd : passenger side they are dark grey with spots , driver side black?????????????? ( have a Weiand 8004 inlet , so dual plenum  )

i have a perfect idle and engine respond good on gas  but not driving.
From the moment i push throtle it is pifpoefpaf....
Pumped all the gas out  ( other brand) and refuelled with  the one  i'm sure  it worked OK. No diverence.

Static advance is set again 4� as previous.

Anybody have a idee ????? i'm






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WHAT DID I WRONG ?

Posted: 3/14/06 8:19pm Message 2 of 184
Former Member
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Belgium
Joined: 1/5/2006
Posts: 774
Vette(s): 350/350 T-top 1970 Cortez silver -blue interior
Hey guys , for me it's 4.15 in the morning and i don't have any sleep....i just wonderd if somewhone have a idee....sh#t man, i'm end of thinking and reading about timing ....Why is my C3 not running the asphalt scribing lines ?????   


WHAT DID I WRONG ?

Posted: 3/14/06 8:33pm Message 3 of 184
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Fox Island, WA - USA
Joined: 6/20/2005
Posts: 4067
Vette(s): 1978 Indy Pace Car 4851 of 6502, Auto, L-48

Sorry about that Barry, but I can only read about your misery   If I were to try and help it would only make things worse.  Thats why I leave work on my Vette to the experts. 

I'm sure someone like Joel will chime in soon and help you out, hes good like that




MARK
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WHAT DID I WRONG ?

Posted: 3/14/06 8:39pm Message 4 of 184
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Joined: 12/16/2003
Posts: 630
Check the firing order. Had that happen once when I switched two plug wires...Idled fine but would puke under load.


WHAT DID I WRONG ?

Posted: 3/14/06 8:54pm Message 5 of 184
Former Member
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Belgium
Joined: 1/5/2006
Posts: 774
Vette(s): 350/350 T-top 1970 Cortez silver -blue interior
Thanx Big Fish , but i checked the firing order a 10 times , seems ok.
Mark you are too HONEST ,  'better ' told me a story to hold on... and try it in the morning....GREAT of you  beeing honest...



WHAT DID I WRONG ?

Posted: 3/14/06 9:11pm Message 6 of 184
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Roseland, NJ - USA
Joined: 12/4/2003
Posts: 966
Vette(s): 1974, 454 with 4 on the floor, matching numbers.
I had a very similar problem, turned out to be a combo of things. Timing, carb adjustment, broken plug. Never figured out which one was the actual cause, but once I had them fixed, the problem was gone. Oh, I almost forgot, another problem that did cause me to have additional engine problems (later on) was some burned plug wires that were to close to the headers. That's the best That I can come up with, I'm sure you'll get it fixed, there are quite a few members here that really know their stuff. Good luck !  


WHAT DID I WRONG ?

Posted: 3/14/06 9:37pm Message 7 of 184
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SHELBYVILLE, TN - USA
Joined: 7/5/2002
Posts: 3942
Vette(s): 1976 L48 auto

1978 L82 4speed

1994 LT1 6speed
Hi... does sound like a delima... maybe check the advace, make sure its moving freely.... and the springs/weights are also moving freely...  kinda sounds like your timing may not be advancing... just kinda guessing though.   Maybe hook up your timing light, and rev it up and see if the timing marks move on the dampner.   Just a thought..?? stingrayjim38801.0625578704


StingrayJim
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WHAT DID I WRONG ?

Posted: 3/14/06 10:22pm Message 8 of 184
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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
In no particular order......
1) Timing is off
2) Vaccuum leak
3) Too rich/lean carb mixture
4) Dwell adjustment off(points)
5) Plug wires not correct(firing order-1-8-4-2-3-6-5-7..clockwise rotation)

Norbert, was it doing this before you changed anything? If not, then it has to be something you did/changed. Sounds like a dwell related issue. Set the points to a tight 30 deg. reading on the dwell(28-29 deg) at idle. The dwell should not change much, if any as the rpm's increase. I'd start there, myself. If the points are not set right, nothing else will be right, either, so any other adjustments are useless.


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WHAT DID I WRONG ?

Posted: 3/14/06 10:27pm Message 9 of 184
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Bladenboro, NC - USA
Joined: 1/22/2006
Posts: 1058
Vette(s): 1972 conv., sunfire yellow, blk interior, blk vinyl and convertible top. Off frame restoration with American Speed 383 stroker engine producing 500hp plus a 200hp NOS system. MSD ignition. Hooker super competition headers with chambered exhaust.
Barry, I'm no mechanic but I'd check the "tits" on my points. Unlike that cow, it will have only 2 Barry. 


WHAT DID I WRONG ?

Posted: 3/14/06 11:17pm Message 10 of 184
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northern, IL - USA
Joined: 9/9/2005
Posts: 135
Vette(s): 1973 t top, 454, manual trans.
did you remove the distributor from engine to install the parts?


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