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Old 05-18-2009, 07:19 PM
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Lame Throttle Response

I have been noticin the last few days that when i first start my truck(350TBI motor), that in park and when its idling i have instant throttle response. If i put it in gear and start drivin and give it 3/4 to WOT it lags severly then it will kick in. I checked the throttle cable seems to be where it should be...After motor warms up the problem seems to go away.. The motor also has a Juice Box chip on it. Have had the truck for a week now and the last couple days it has been doin it....

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Old 05-18-2009, 07:24 PM
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Im starting to wounder if i bought a lemon
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Old 05-19-2009, 03:11 AM
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It does this only when it`s cold, I would think thats the reason, it`s not often many of us are 3/4 or full throttle when the engine is still cold and the cold start is still in use.
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Old 05-19-2009, 03:56 AM
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Im not talking about starting the truck then flooring it.... let it run for 5 min at least... still does it? it sounds like its almost choking
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Old 05-19-2009, 05:23 AM
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Check for codes set by the ECM- even if there's no "Check Engine" light on.

You can check for obstructions in the air intake tract, as well as clean the TB real good w/spray cleaner made for the purpose.

Count the shifts to see if it's taking off in second gear.
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Old 05-19-2009, 07:29 AM
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My truck is on 120 degrees in 5 minutes. Since this engine was inplanted in your S-10, I`m guessing it uses a open element air cleaner. When the truck does this, does it do so in the mornings and thats it? or anytime the engine is cold? I ask as it could be throttle blade icing which happens when it`s cold in the mornings and the moisture in the air freezes on the throttle blades due to the high velocity. The stock air cleaner has a heat diverter in it that draws off the exhaust manifold when cold to prevent this.
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Old 05-19-2009, 08:58 AM
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This is an S-10/350 TBI swap?
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Old 05-19-2009, 02:46 PM
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Yes doublevision it does it everytime the motors cold....and yes it is open element, it has a K&N airfilter sitting ontop of the TB. Cobalt, it is a 350TBI swap that buddy put into the truck. I didnt do it so i dont know much about what he did. ALl he told me that it was a stock 350TBI out of a 85-91 K1500 series truck. It has full headers, exhaust, Juice Box chip and just the K&N airfilter.. just the minor bolt ons.
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Old 05-19-2009, 03:02 PM
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check fuel pressure

maybe the regulator is stuck on the TB unit

thats where i would start


new filter also if its been on for a long time, a restriction if it has metal rust dirt in it

in which is commonly seen here at the shop- especially on fuel injection engines more commonly than any others it seems.,

i bet its a fuel pressure/volume issue

good luck
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Old 05-19-2009, 03:04 PM
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Quote:
Originally Posted by 350chevypower
Yes doublevision it does it everytime the motors cold....and yes it is open element, it has a K&N airfilter sitting ontop of the TB. Cobalt, it is a 350TBI swap that buddy put into the truck. I didnt do it so i dont know much about what he did. ALl he told me that it was a stock 350TBI out of a 85-91 K1500 series truck. It has full headers, exhaust, Juice Box chip and just the K&N airfilter.. just the minor bolt ons.
TBI engines can be fitful when cold, it takes 176 degrees before it leaves cold start mode.

The intake needs heat just like a carb when it's cold or else you get fuel distribution and moisture freezing problems in the intake. The factory air cleaner assembly also provided a design that supplies heat off the exhaust when cold to help the fuel vaporization problem; then it has a heat sensitive door that would close the hot air source and open a cold air intake system to imporve power when the engine was warmed up and no longer needed extra heat to vaporize the fuel within the intake. It would be a good idea to ditch the K&N and go back to the factory unit. Just goes to show you how good advertising overcomes common sense.

Why does it have a chip if all that was done was to put headers on it? Headers and duals are within the range of the computer's ability to resolve the mass air flow change. It's possible a chip has the computer screwed up.

Bogie
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Old 05-19-2009, 03:48 PM
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First off thanx for the responses guys I appreciate it. Now I dont think the chip would be causing the issue beacuse it was driving good while it was warm out.......Ill be lookin into the fuel sytem here shortly beacuse after all the input i have a sneeky suspicion it might be just a fuel filter or a dirty TB unit ill clean er all up and get back to you guys thnx alot!
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Old 05-19-2009, 03:49 PM
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or truthfully it prob jjust needs a good tuneup. the guy had it sitting all winter in his garage so.....
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