[AT] Any Chevy TBI experts

[charlie hill]

Cecil,  if you get a Chiltons manual or the cheap one they sell at places 
like AutoZone and look hard enough you can find the voltage ranges for the 
throttle position sensor and it will tell you which wires to probe.  Take a 
multi-meter, preferably an analog one, and connect it to the throttle 
position sensor.  Move the sensor by hand and look for spikes or open spots 
in the needle sweep of the multimeter.  That will tell you if the TPS is ok. 
The problem might be partially clogged injectors or a bad spray pattern from 
injector wear.  Could also be a bad Oxygen sensor I guess.

If you can't get ahold of a manual write me off list and I'll look stuff up 
for you.

If you wind up needing to repair the throttle body AutoZone can get you one 
rebuilt by Holley for about $300 bucks or so.  A new one from GM is about 
$1500.00

Hope this helps.

Charlie
----- Original Message ----- 
From: "Cecil Bearden" <crbearden at copper.net>
To: "Antique tractor email discussion group" <at at lists.antique-tractor.com>
Sent: Saturday, November 05, 2005 2:06 AM
Subject: Re: [AT] Any Chevy TBI experts


> This is for my tractor hunting vehicle.....
>
> I have an 89 chevy 4wd 3/4 auto w/ TBI..    at light load, either starting 
> out, or running at 30-40 mph the engine surges.  It drives me nuts.  Has 
> anyone had this problem or knows how to solve it.  I have looked at 
> several statements about this on the internet, and according to what I 
> read, it could be a 2 week chore testing everything that it could be.  I 
> do have a on-board tester for it, but I have never had any codes show 
> up....
>
> Cecil in OKla
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