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bogging under load

 
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jchaussee
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Joined: 14 Nov 2010
Posts: 1318
Location: renton


PostPosted: Wed Apr 03, 2013 7:39 am    Post subject: bogging under load Reply with quote

So it did it previously but now it does it everytime.doesnt do it under load. Doesnt do it in first gear. Around 2500 to 3500 rpms when i am wot or close to it , it bogs down and surges . Feels like nit getting fuel or something. Was also idling bad like it wanted to die . Adjusted fast idle cam. Still does same thing but now also does a small backfire. Loojed up in intraweb and seems to point toeards timing or fuel pump. But i trustvthe tried and true silutions of the members here , so looking for input.
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91RSVert
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Joined: 16 May 2007
Posts: 2736
Location: AR

1991 Chevrolet Camaro RS

PostPosted: Wed Apr 03, 2013 9:50 am    Post subject: Reply with quote

I would check timing, easy and free. Thats also what my jimmy was doing was bogging at middle rpms. Timing fixed most of it.
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2008 GMC Z71
1991 Camaro RS Vert
1972 Jimmy 4x4
20ft Longhorn Car Hauler
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RSFreak
The other "John"


Joined: 23 Jan 2004
Posts: 2946
Location: Renton

1989 Chevrolet Camaro RS

PostPosted: Wed Apr 03, 2013 3:40 pm    Post subject: Reply with quote

We keep making plans for me to go over and help him with the timing, but our schedules haven't been compatible recently.
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'86 Trans Am - 5.0L TPI - LT1 cam - 700R4 - WS6
'85 Camaro Berlinetta - IROC clone
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aaron_sK
Member


Joined: 23 Jan 2006
Posts: 8834
Location: Back in beautiful Tacompton

1987 Chevrolet Camaro IROC-Z

PostPosted: Wed Apr 03, 2013 3:46 pm    Post subject: Reply with quote

Could be any number of things.

You need to start with all the basic free checks: read plugs, check timing, check for proper timing curve, check fuel pressure, check proper operation of the pump shot and secondaries, ect.

My guess is that the pump shot is too small and the initial timing is too retarded (followed by a steep curve), but that is just a blind shot, worth what you paid for it. Cool
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jchaussee
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Joined: 14 Nov 2010
Posts: 1318
Location: renton


PostPosted: Wed Apr 03, 2013 9:17 pm    Post subject: Reply with quote

Unfortunatly i dont kbow how to check timing which is why i am glad jihn said he would help and show me how. It is a skill i need to know.
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jchaussee
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Joined: 14 Nov 2010
Posts: 1318
Location: renton


PostPosted: Wed Apr 03, 2013 9:20 pm    Post subject: Reply with quote

And i dont kbow if my carb is operating correctly. Itvis a early80s non cc truck carb. Was on it when i got it. I rebuilt it several years ago bit know nothing about how to tune correctly . I was going to take it to carb place on kent when i got my other heads on and my new performer rpm. But that hasnt happened yet. I need to get a t top first .
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