causes of hesitation?

[gary]

motor is a stock 22r, carb'd, with headers...nothing special
hesitates very noticiably when you floor it...
changed plugs, distibutor cap and rotor, cleaned air filter, cleaned fuel filter, set the timing (0 with the vacuum lines plugged) and messed with the carb settings, including mixture...all to no avail...
can't see any fuel in the little glass window on the carb, pretty much ever...manual says it should be about half full...can't get it to fill...
any suggestions? truck needs to pass smog asap, and i want it running as well as possible for them...

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[tre5]

fuel pump??

[JasonHutter]

Isn't your timing a little retarded. I think it is supposed to be 8 deg BTDC with the vacuum line plugged or a jumper wire or paper clip in the plug on the fender well. I don't have my Toyota book here, but I think that is what it should be. The only other thing would be that you might need to rebuild your carb....?

Jason

[JasonHutter]

I just found my Chiltons Manual and here is what it says about hesitation or stumble during acceleration.

1 Ignition timing incorrect.
2 Ignition system not operating properly.
3 Dirty or clogged carburetor or fuel ingector.
4 Low fuel pressure. Check for proper operation of the fuel pump and for restriction in the fuel filter and lines.
5 Carburetor out of adjustment.


Jason

[gary]

fuel pump is fairly new...might be worth switching, just in case

carb was rebuilt maybe 2 -3 yrs ago....think it'd need it again?

[gary]

does it say what correct timing is? my manual is a haynes, or something, and says refer to hood for the timing #...i dont have it anymore...called a few shops, they said 0 with vac. plugged...

[JasonHutter]

You never know with the abuse we desert junkies put on our vehicles. We just rebuilt the carb on our race truck after about 3-4 years and that was too long. It was a noticable difference after the rebuild in power. We also found a lot of dirt in all the little ports and nooks and crannies.

Jason

[JasonHutter]

My manual says the same thing. All of the trucks I have had with the 22r says 8 deg BTDC including my 22re I drive every day. We run our race engine a lot more advanced than that, as long as it doesn't ping you are usually alright advancing it some.

Jason

[gary]

with or without the vac lines ?

[JasonHutter]

The hood always said with the vacuum lines plugged 8 deg.