22r Air/fuel? Carb? Pump? BIG, maybe easy problem???HELP!!

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jsmith93blazer - 23 Mar 2007 02:30 GMT

I have a 1990 Toyota Pickup. It's been a great truck. In normal
driveing the truck has always had a studder while going down the road
at a steady speed. First start of the day, the truck takes a min to
reach full low idle (have to press peddle to get the low idle most the
time) <maybe norm. when the truck is at idle with ac running it'll
idle up and down by it self, you can see the carb open and close a
bit?? Ok now for what happen and the reasion i ask, truck had a small
heating problem, took out the t-stat, and took it for a test, running
the ac to try and make it run hot, it done good. THEN i turned off the
ac and i was backing out of a driveway and slighty bottemed out(not
very serious) and from that moment it ran bad. the truck now will only
idle, or run WOT. reving the engine and holding the peddle steady
makes the engine rev up then acts like it's being choked and about to
die and stays that was untill you let go. I'm just puzzled. but i'm
thinking maybe a air/fuel problem. or somthing to do with running the
ac. engine and carb was rebuilt maybe 4-5 years ago. fuel pump is from
autozone. (and i checked the tank and lines their ok.)

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Jarhead - 23 Mar 2007 03:15 GMT

| I have a 1990 Toyota Pickup. It's been a great truck. In normal
| driveing the truck has always had a studder while going down the road
[quoted text clipped - 13 lines]
| ac. engine and carb was rebuilt maybe 4-5 years ago. fuel pump is from
| autozone. (and i checked the tank and lines their ok.)

How's your exhaust pipe? I would look for something that "bottoming out"
may have damaged.

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Jarhead

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al - 25 Mar 2007 02:23 GMT

> I have a 1990 Toyota Pickup. It's been a great truck. In normal
> driveing the truck has always had a studder while going down the road
[quoted text clipped - 13 lines]
> ac. engine and carb was rebuilt maybe 4-5 years ago. fuel pump is from
> autozone. (and i checked the tank and lines their ok.)

It may be, as has been suggested, that the "bottoming out" broke
something loose in the exhaust and you now have a blockage. I'd look
for disintegration within the catalytic converter. They rot out
internally after years of use and a sharp blow might dislodge a bunch
of crud. There is likely a screen at the outlet of the catalytic
converter that could get blocked if enough loose material where
present. Do you notice considerably less exhaust coming out of the
tailpipe? Also, is the exhaust manifold getting both hotter than
normal and getting hotter faster? If so, it sure points to exhaust
blockage. Good luck. Al

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