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Something Rong?????? HELP??? 6.6L 400ci V8 Pontiac

 
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74pontiacGA
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Joined: 26 Apr 2009
Posts: 8

391.20 points



PostPosted: Thu Oct 01, 2009 10:17 pm    Post subject: Something Rong?????? HELP??? 6.6L 400ci V8 Pontiac Reply with quote

i have a 1974 Pontiac Grand AM
6.6L 400ci V8
Th400 Tranny

Ok so the motors got a ruff idel but only when it warms up, and from time to time when you rev it it will cut out and almost die but when it revs up it sounds grate and when you drive it it wants to die but agen when you give it gass its a Screamer!!! TONS OF POWER!!!.... i replaced the plugs,wires,cap and rotor,has an older holly 600cfm carb and new Edelbrock Proformer RPM intake, Does not smoke iv checked the timeing and it perfect, and there are no Vac Leakes

It passed its E Test to day some how........

Im gona drive this car from colorado to Washington State so plz if any one has advise,Info suggestions or something?!?!?! plz let me know sooon!! Thanks Shocked
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af2
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Joined: 01 Sep 2003
Posts: 5579
Location: grassvalley, ca
71896.24 points


1933 Willys Coupe

PostPosted: Thu Oct 01, 2009 10:36 pm    Post subject: Reply with quote

Rev the motor to about 3500 and put a rag over the carb until it almost dies a few times to see if nothing is lodged in the fuel circuits.

Ya you guys will give me greif. But it will work on a carb that has crap in it.
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74pontiacGA
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Joined: 26 Apr 2009
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PostPosted: Thu Oct 01, 2009 10:42 pm    Post subject: Reply with quote

af2 wrote:
Rev the motor to about 3500 and put a rag over the carb until it almost dies a few times to see if nothing is lodged in the fuel circuits.

Ya you guys will give me greif. But it will work on a carb that has crap in it.
haha sorry but yah ill try that tomarrow Thanks
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10sec.et
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Joined: 29 Mar 2006
Posts: 3483
Location: Houston,Texas
347040.52 points


1969 Oldsmobile Cutlass

PostPosted: Thu Oct 01, 2009 11:27 pm    Post subject: Reply with quote

af2 wrote:
Rev the motor to about 3500 and put a rag over the carb until it almost dies a few times to see if nothing is lodged in the fuel circuits.

Ya you guys will give me greif. But it will work on a carb that has crap in it.


back in tha day, i had a carb that just wouldnt run right. i tried everything. wasted damn near an entire day screwing with it. finally an old-timer walks up to the car, cracks the throttle wide open, shoves a rag on top and just before it dies, he repeats the process............ fu#%ing thing smoothes out and runs better than it ever has Shocked .

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af2 wrote:
It seems we can look at our magical Balls and come up with a fix?

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Paul P
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Joined: 15 Aug 2002
Posts: 2454
Location: Townsend, Mass.
83266.64 points


1971 Chevrolet Chevelle

PostPosted: Fri Oct 02, 2009 9:04 am    Post subject: Reply with quote

What carb are we talking about Holley or Carter? The rag will work on both types but just wondering if it is something more fundamental than that.
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2001 Focus 2.0 Zetec
stock cams, bolt-ons and tune
15.63@87 MPH 1/4mi

1971 - Chevelle 408 SBC N/A
6.59@104.03 MPH 1/8mi
10.40@127.73 MPH 1/4mi
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squeeezer
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Joined: 02 Mar 2007
Posts: 2427
Location: new richmond WI
191524.76 points


1991 Chevrolet Camaro

PostPosted: Fri Oct 02, 2009 7:19 pm    Post subject: Reply with quote

my first guess ....accelerator pump
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Skunkworkx
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Joined: 02 Sep 2007
Posts: 353
Location: Harford Co. Maryland
10348.44 points


1968 Chevrolet Camaro

PostPosted: Fri Oct 02, 2009 8:50 pm    Post subject: Reply with quote

Blown power valve ????
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clay
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Joined: 24 Nov 2002
Posts: 3209
Location: South Carolina
318129.23 points


1972 Chevrolet Nova

PostPosted: Fri Oct 02, 2009 10:22 pm    Post subject: Reply with quote

I wouldn't think it would pass emissions with a blown power valve, and it would run much worse that what he is describing. Accelerator pump maybe, but I'm thinking still maybe ignition. I'm pretty sure that in '74 most Chevrolet's still had points style ignitions (not sure about Pontiacs). Does yours and if so did you replace the points AND condensor? I'm thinking it sounds like an electronic component heating up maybe. Could also be the coil. You could drive it until it starts having the symptoms then run cold water over the coil for a few minutes while the engine is still running to cool it off then drive it again to see if it goes away. Absolutely try the rag trick, I've done it on lawnmower engines and it works wonders on them. I can't get my mind around what exactly it might be, I'm just throwing out ideas for possibilities. Clay
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squeeezer
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Joined: 02 Mar 2007
Posts: 2427
Location: new richmond WI
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1991 Chevrolet Camaro

PostPosted: Fri Oct 02, 2009 11:10 pm    Post subject: Reply with quote

74 first year of (big cap)hei
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clay
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Joined: 24 Nov 2002
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Location: South Carolina
318129.23 points


1972 Chevrolet Nova

PostPosted: Fri Oct 02, 2009 11:21 pm    Post subject: Reply with quote

Maybe the module going bad in the HEI then. Thanks for the info. I wasn't sure, Dad had a 75 Chevy truck that still had points but I know GM did things at different times in different divisions. I think they used Ponitac for a test bed on some things before they put it on Chevrolet stuff so the flagship brand could always have "tested" technology. Clay
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