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7.4 Vortec engine misses at idle

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Jabarco

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Feb 11, 2002, 4:08:35 PM2/11/02
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I have a 97 Suburban K2500 with a 7.4 Vortec engine that has a slight miss
at idle, almost like it is missing now and again that I notice especially
while sitting idle at a stop light. Other than the occasional miss at idle,
it runs great. What should I look for to eliminate this miss at idle?
Thanks for any replies that would help solve this problem.

Jabarco


Bill Seward

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Feb 11, 2002, 8:14:06 PM2/11/02
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"Jabarco" <bull...@hotmail.com>, hoping against hope for wisdom from
USENET, wrote:

Dean Dardin may contradict me, and if he does, believe him, but I've
been told that it's simply how a big block idles.

jed

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Feb 11, 2002, 11:33:15 PM2/11/02
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EGR?

"Bill Seward" <sew...@northstate.net> wrote in message
news:s0rg6u0jnm8vrih98...@4ax.com...

Snowman

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Feb 12, 2002, 7:54:44 AM2/12/02
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I will also disagree with that one. My '90 TBI 454 never missed a beat when
I had it.

Snowman

"Bill Seward" <sew...@northstate.net> wrote in message
news:s0rg6u0jnm8vrih98...@4ax.com...

Dean Dardwin

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Feb 12, 2002, 1:59:22 PM2/12/02
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Jabarco,

This is very common. I'll bet there is MTBE and/or ethyl alcohol in your
gas, right? They foul injectors. Try running a tank with Chevron's
TECHRON FI cleaner and see if it doesn't improve. Don't substitute. I
have to run some about every 10th tank or so.

Less likely is water in gas. STP Water Remover will remove it and
contains no alcohol.

Occasionally a dirty EGR pintle will hold the valve slightly open at
idle when it should fully closed. In neither of the first two work, you
might want to pull the valve and clean it.

Dean

Mark Radosevich

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Feb 13, 2002, 12:53:14 AM2/13/02
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I think some disinformation was just provided by the previous
poster...


> This is very common. I'll bet there is MTBE and/or ethyl alcohol in your
> gas, right? They foul injectors. Try running a tank with Chevron's
> TECHRON FI cleaner and see if it doesn't improve.

Both MTBE and ethanol are known to clean fuel injectors, not plug them
up. And what do you think is the main ingredient in Techron? Better
ask somebody that knows. It just might be ethanol... :-)


> Less likely is water in gas. STP Water Remover will remove it and
> contains no alcohol.
>

Please read the labels on gasoline water remover products. Most of
them contain nothing more than 3¢ worth of single-carbon methanol
bottled in a 5¢ plastic package and sold to you for $1.95 or so. It
is alcohol and ethers that "bind" with water which has phase-separated
from gasoline in the bottom of your tank. Once bound to alcohol, the
mixture then blends into gasoline and be combusted. Straight water in
the fuel line can freeze in winter and we've all experienced a big
slug of water in our gasoline when the engine coughs and stalls.

I just had to say something here when I see obvious 180 degrees going
on.

Good nite... --Mark

Dean Dardwin

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Feb 13, 2002, 5:43:34 AM2/13/02
to


Mark Radosevich wrote:
I think some disinformation was just provided by the previous
poster...
 
This is very common. I'll bet there is MTBE and/or ethyl alcohol in your 
gas, right? They foul injectors. Try running a tank with Chevron's 
TECHRON FI cleaner and see if it doesn't improve. 

Both MTBE and ethanol are known to clean fuel injectors, not plug them
up.  And what do you think is the main ingredient in Techron?  Better
ask somebody that knows.  It just might be ethanol... :-)

Ethanol mixes with water in the gas and forms an emulsion that plugs injectors when the engine is turned off and heat soaks. This is a very well known phenomenon. I've used TECHRON for years to solve this problem; my vehicles and many others. 



Less likely is water in gas. STP Water Remover will remove it and 
contains no alcohol.


Please read the labels on gasoline water remover products.  Most of
them contain nothing more than 3¢ worth of single-carbon methanol
bottled in a 5¢ plastic package and sold to you for $1.95 or so.  It
is alcohol and ethers that "bind" with water which has phase-separated
from gasoline in the bottom of your tank.  Once bound to alcohol, the
mixture then blends into gasoline and be combusted.  Straight water in
the fuel line can freeze in winter and we've all experienced a big
slug of water in our gasoline when the engine coughs and stalls.

Wrong! Read the post. STP Water Remover contains NO alcohol of ANY kind!



I just had to say something here when I see obvious 180 degrees going
on.

So did I!


Good nite...  --Mark

Joe Lacetera

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Feb 18, 2002, 7:19:39 AM2/18/02
to
Does sound like a fuel problem. Whenever I filled up my 97 454 K2500 in New
Jersey, I experienced rough idle, stalling, and stumbling. I have never had
this experience anywhere else.

Joe L

"Dean Dardwin" <d...@dxd.com> wrote in message
news:3C69660A...@dxd.com...

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