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Author Topic: Truck won't rev faster than 2k without dying?  (Read 22521 times)

Offline zieg85

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Re: Truck won't rev faster than 2k without dying?
« Reply #60 on: May 12, 2013, 04:02:05 pm »
Replace the fuel filter and if that doesn't solve it I would start by disconnect the exhaust pipe to rule out a clogged cat.
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Carl 
1985 C20 Scottsdale 7.4L 4 speed 3.21
1986 C10 under construction
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Offline 79brent

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Re: Truck won't rev faster than 2k without dying?
« Reply #61 on: May 12, 2013, 06:11:30 pm »
fuel filter is new now, forgot I had money on my autozone card, timing is not the issue either. I set it back and advanced it, no difference. I can see gas spitting out as I rev it up because the motor isn't using it. Next stop will be to unbolt the exhaust crossmember, but I doubt that is the problem.
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1979 Chevy C10 Silverado package. 350/350

"Lifes a garden DIG it"

Offline rich weyand

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Re: Truck won't rev faster than 2k without dying?
« Reply #62 on: May 12, 2013, 06:52:36 pm »
It could be centrifugal advance.  The centrifugal advance should be 20* more, and should all come in around 2000 rpm.  If it doesn't come in -- the timing does not advance -- you will run out of power above 2000 rpm, because the spark just isn't getting there in time.

To check it is easy.  Remove the vacuum advance hose and plug the vacuum leak at the carb.  Put the timing light on the engine and check the timing at idle.  Should be 12*-16* or so.  Now speed the engine up to 2000, 3000 if you can.  Does the timing change to 20* more than it was at idle?  If not, the centrifugal advance mechanism is broken. 

I know you said you checked the springs and all, but an operational check is best.
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Rich

"Working Girl": 1978 K-10 RCSB 350/TH350/NP203 +2/+3 Tuff Country lift

Offline 79brent

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Re: Truck won't rev faster than 2k without dying?
« Reply #63 on: May 13, 2013, 01:02:04 am »
Ok so I unbolted the exhaust crossmember and guess what? The 2 year old cat IS in fact plugged. Thanks again for the help I wouldn't of figured that out on my own. You guys are awesome!
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1979 Chevy C10 Silverado package. 350/350

"Lifes a garden DIG it"

Offline rich weyand

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Re: Truck won't rev faster than 2k without dying?
« Reply #64 on: May 13, 2013, 02:24:23 am »
Excellent!  So, did you replace/unclog it, and did that fix the problem?
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Rich

"Working Girl": 1978 K-10 RCSB 350/TH350/NP203 +2/+3 Tuff Country lift

Offline Fairlane514

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Re: Truck won't rev faster than 2k without dying?
« Reply #65 on: May 13, 2013, 06:24:13 am »
How do you know its plugged?
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Offline gildardo01

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Re: Truck won't rev faster than 2k without dying?
« Reply #66 on: May 13, 2013, 07:34:52 am »
wow i cant believe clogged cat converters are more common than i thought... 
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Offline 79brent

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Re: Truck won't rev faster than 2k without dying?
« Reply #67 on: May 13, 2013, 08:55:33 am »
Because it wont rev with the exhaust hooked up but runs perfect with it off. I took it for a little test drive, felt complaining. How would you go about unclogging it? I was thinking about ripping the guts out because I don't gotta get smogged for 2 years  8)
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1979 Chevy C10 Silverado package. 350/350

"Lifes a garden DIG it"

Offline gildardo01

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Re: Truck won't rev faster than 2k without dying?
« Reply #68 on: May 13, 2013, 09:10:30 am »
Quote from: 79brent on May 13, 2013, 08:55:33 am
Because it wont rev with the exhaust hooked up but runs perfect with it off. I took it for a little test drive, felt complaining. How would you go about unclogging it? I was thinking about ripping the guts out because I don't gotta get smogged for 2 years  8)
i dont think its such a bad idea... it buys you time and money for 2 years and its free.... forget green peace... lol
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Offline 79brent

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Re: Truck won't rev faster than 2k without dying?
« Reply #69 on: May 13, 2013, 09:22:45 am »
Yeah and ill have the money by then to get the x pipe off this site and buy to high flow cats for it and run it like that, probably get some headers to  8)
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1979 Chevy C10 Silverado package. 350/350

"Lifes a garden DIG it"

Offline Fairlane514

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Re: Truck won't rev faster than 2k without dying?
« Reply #70 on: May 13, 2013, 10:15:32 am »
You can get a long pice of round steel about and 1/8 inch thick, bend a "L" shape on the end so its fits into the pipe opening. Chuck it into a drill and bore out all the material, or at least enough to have flow.
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Offline 79brent

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Re: Truck won't rev faster than 2k without dying?
« Reply #71 on: May 13, 2013, 11:16:59 am »
I was just thinking about pulling half off by bending back the flaps that hold the 2 pieces together and ripping it all out. :o
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1979 Chevy C10 Silverado package. 350/350

"Lifes a garden DIG it"
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