[AT] Any Chevy TBI experts

Sun Nov 6 11:42:10 PST 2005

The 5.7 in my 89 GMC has been setting a EGR code every since it had about 
40,000 miles on it.  Changing EGR valves didn't do any good so I just live 
with it.  Engine runs  fine, the plugs burn clean and the fuel mileage is 
about what it should  be.

Charlie

----- Original Message ----- 
From: "Steve W." <falcon at telenet.net>
To: "Antique tractor email discussion group" <at at lists.antique-tractor.com>
Sent: Sunday, November 06, 2005 10:33 AM
Subject: Re: [AT] Any Chevy TBI experts

> Cecil,
> The 4.3 has a BIG problem with the EGR system. GM even issued a new
> program to control them because of the problem. What generally happens
> is that a piece of carbon will break loose inside the exhaust crossover
> that feeds the EGR and it gets stuck between the pintle and the seat and
> holds it open just enough to cause problems. Been through it enough
> times that I finally got fed up and bought a new gasket that has a
> screen in it to stop the crud from causing problems. I also used to GM
> Top Cylinder Cleaner and knocked most of the carbon out with that. It is
> a great way to clean out the crud in the engine. You just trickle it
> into the intake with the engine running until the you have used about
> 2/3 of the can, then dump in the rest to cause it to shut down. Then let
> it soak for a while and then start back up and drive it around a bit.
> Clears out the carbon from the valves and head. BUT DO NOT USE IT
> INDOORS or near any neighbors you like. It will generate enough smoke
> that you will think the engine is on fire and burning all the oil. It
> also throws a LOT of carbon and soot out the tailpipe so aim it away
> from anything you don't want turned black.
>
> Here is the gasket I use on all 4.3s now
> http://www.tomco-inc.com/
>
> top engine cleaner part #1050002 from a GM dealer 1 can will do a 4.3
>
> Steve Williams
> Near Cooperstown, New York
>
>
> ----- Original Message ----- 
> From: "Cecil Bearden" <crbearden at copper.net>
> To: "Antique tractor email discussion group"
> <at at lists.antique-tractor.com>
> Sent: Sunday, November 06, 2005 7:10 AM
> Subject: Re: [AT] Any Chevy TBI experts
>
>
>> It was the EGR valve....
>> I checked it with the OTC 2000, and did not have any codes, and
> everything
>> looked fine on the data stream.  So, used the old fashioned way.  Pull
> off a
>> line and see if it made any difference.  Sere enough it was the EGR.
> Put
>> the line back on and it worked fine.  Must have been stuck or
> something...
>>
>> Had to cahnge the transmission fluid, and found a "string" wound
> around the
>> left CV joint boot.  Could not cut this string with my knife except
> one
>> strand at a time.  It looked like horse hair!!!!!!
>> Parts house guy said it was a deep sea fishing line that had a fine
> cable in
>> it.  IN OKLAHOMA???!!!!
>>
>> Never fails, spent 4 hours putting these on about a year ago...
> Can't get
>> the new one until noon today.  NAPA is closed, O'Reilleys has it in
> their
>> warehouse, and Autozone carries the same line of boots, but does not
> carry
>> that number!!!!!!!!!!!
>>
>> Crazy
>>
>> Cecil in Okla
>> ----- Original Message ----- 
>> From: "ken knierim" <wild1 at cpe-66-1-196-61.az.sprintbbd.net>
>> To: "Antique tractor email discussion group"
> <at at lists.antique-tractor.com>
>> Sent: Saturday, November 05, 2005 2:26 PM
>> Subject: Re: [AT] Any Chevy TBI experts
>>
>>
>> > On Sat, 2005-11-05 at 00:06, Cecil Bearden wrote:
>> >> 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
>> >>
>> >
>> > Try the simple stuff first... cap, rotor, plugs, plug wires... that
>> > seems to fix a lot of things. After that, the next most likely
> culprit
>> > would be the throttle position sensor... those seem to fix all kinds
> of
>> > troubles on my '88 Camaro 305 TBI.
>> >    I also had a really freaky one with the electronic spark control
> on
>> > my '86 Blazer. There was some noise in the driveline that would show
> up
>> > coming off a light and it would get picked up by the knock sensor,
>> > causing a huge stall and surge as it retarded and advanced the
> timing.
>> > Replaced the knock sensor, went through about everything, finally
> ripped
>> > out the knock sensor and went to an old-style distributor (thinking
> the
>> > noise was rod noise). When I finally tore everything down and
> separated
>> > the engine from the transmission, I found that the factory hadn't
> gotten
>> > the flex plate bolts tight. It had come loose and was slotting the
> holes
>> > in the flex plate. The mechanical noise was getting picked up by the
>> > knock sensor and wreaking havoc on driveability, similar to your
>> > description. It was carbureted but they may be running similar knock
>> > sensors...
>> >
>> > Oh, 1986 305 V8, Rochester 4 BBL, TH700R4, K-5 Blazer (4X4).
>> >
>> > Ken in AZ
>> >
>> > _______________________________________________
>> > AT mailing list
>> > Remembering Our Friend Cecil Monson 11-4-2005
>> > http://www.antique-tractor.com/mailman/listinfo/at
>>
>> _______________________________________________
>> AT mailing list
>> Remembering Our Friend Cecil Monson 11-4-2005
>> http://www.antique-tractor.com/mailman/listinfo/at
>>
>
> _______________________________________________
> AT mailing list
> Remembering Our Friend Cecil Monson 11-4-2005
> http://www.antique-tractor.com/mailman/listinfo/at
>
>
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