why doesnt my truck run right?
#1
why doesnt my truck run right?
it seems like its a new thing every week. i timed it, it ran good for a week, carb accel pump wasnt working, so i rebuilt the carb. ran good for a couple days, now it seems like the same damn problem, its like a hesitation like when the accelerator pump was bad just not as severe. and its only under load. my accelerator pump is pumping just as it should i dont know what else it is since i just cleaned and rebuilt the carb 2 days ago, unless my fuel filter could be plugged up? what do you suggest? what could be the problem
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im using an old screw on filter as an in line cus its all i had, but i just remembered dont the carb to intake gaskets blow out a lot on the edlebrock performer 400. someone told me there was a spacer for it that prevented it from happening, which i dont have. ill throw it on the vacuum gauge again see what i get maybe just check that gasket
#6
If you did not replace the fuel filter when you rebuilt the carburetor, you must do that.
What did the vacuum gauge say? There are few situations where the engine can have a healthy vacuum reading, but run poorly - unless the issue has zero interaction at idle (which doesn't sound like it's the case if it's off-idle that the issues shows up).
#7
what i mean is that its advancing more than 60 degrees under load and it does start pinging under load. and i just set the timing to 10 degrees advanced. I've been told 60 degrees is way too much, and I've been running this truck with no vacuum advance since i got this truck and with ones before it, I've never had a problem until now. i haven't had the time to look at it yet this week, but i will this weekend, i will let you know what vacuum is and if i find a solution, till then any other suggestions are welcome
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Here is a link regarding initial timing, curving, vacuum and total advance if you would like to read:
Carbed Ford Message Board :: View topic - The Ultimate Duraspark Ignition Timing Guide
Carbed Ford Message Board :: View topic - The Ultimate Duraspark Ignition Timing Guide
#14
Join Date: Oct 2011
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Here is a link regarding initial timing, curving, vacuum and total advance if you would like to read:
Carbed Ford Message Board :: View topic - The Ultimate Duraspark Ignition Timing Guide
Carbed Ford Message Board :: View topic - The Ultimate Duraspark Ignition Timing Guide
From the post/article:
Vacuum advance is tricky to tune because there is no direct measurement like total. In fact, the reason you must measure initial and total timing with the vacuum hose disconnected is because when the engine is in neutral there no load, thus the vacuum is high, and if the hose were connected you'd see as high as 60 degrees advance and think something is really wrong! The only way to tune vacuum advance is on the road, by feel, and AFTER the initial and total are adjusted.
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#15
ok, i just read that whole article and it was very helpful, now i have one question, vacuum advance is supposed to use manifold vacuum? i did a lot of asking around and not once did someone say manifold vacuum, i was under the impression vacuum advance was for when you want to accel fast and the centrifical advance wasnt enough. so either was a vacuum advance wasnt my problem because i experience this issue at Close to WOT or WOT, anything below half throttle is fine