Topic: WHAT DID I WRONG ?
in Forum: C3 Engines
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Former Member
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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



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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Former Member
Send PM
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 ????? 














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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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...


Mark you are too HONEST , 'better ' told me a story to hold on...






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 !

SHELBYVILLE, TN - USA
Joined: 7/5/2002
Posts: 3942
Vette(s): 1976 L48 auto
1978 L82 4speed
1994 LT1 6speed
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..?? stingrayjim 38801.0625578704

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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.
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.

Joel Adams
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Former Member
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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.

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