Question about Chevrolet Astro

1 Answer

I just purchased 1994 chevrolet astro van with 4.3l v6 engine and it seems to choke down when u try and accelerate a little hard to build up speed or when you try and give more gas going up a hill it does almost like a carburetor wit a flat spot,but it runs good but it just seems as when the gas pedal reaches a certain spot it dies down and once you press the pedal past the spot it runs fine, where to start other than the fuel filter i have changed that

Posted by on

  • roccaus2002 Jul 31, 2010

    very helpful and much needed information, thx alot guys

×

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Chevrolet Master
  • 6,826 Answers

Have you checked the tps or throttle position sensor?

i just purchased 1994 chevrolet - prev.gif next.gif Throttle Position Sensor Operation Throttle Position Sensors (TPS) are the only sensor in the Engine Management System (EMS) that the vehicle operator has direct control. The sensor is a potentiometer providing an analog signal to the computer. This signal represents how far the throttle plates have opened.
Engine Management Systems calculate how much air should have entered the engine and compares this value with the Manifold Absolute Pressure (MAP) sensor or Mass Air Flow (MAF) sensor value. The EMS uses this information to calculate fuel delivery and ignition timing requirements.
Engine Management Systems on vehicles equipped with an electronic transmission utilize the TPS sensor in combination with MAP and MAF sensor values to determine shift schedules and torque converter clutch application.
Some vehicles will also incorporate a throttle switch. The throttle switch is used to notify the EMS when the throttle is either at wide-open throttle or at idle.
Related Symptoms A faulty throttle position sensor or switch due to loose connections, bad grounds, high resistance in the circuit, or opens in the circuit can cause the following symptoms:

  • Bucking
  • Hesitation
  • Stumble
  • Chuggle
  • Stalling on Acceleration

Posted on Jul 31, 2010

  • 3 more comments 
  • roccaus2002 Jul 31, 2010

    i haven't checked the tps, how do i check it and where is it exact location on a chevy astro

  • Duane Wong
    Duane Wong Jul 31, 2010

    The tps is located on the throttle body and is connected to the shaft of the throttle plate.



    It can be tested by backprobing the connector with paper clips and connecting a multimeter to it and operating the throttle while the car's ignition is on but not running.



    You should see a smooth voltage increase or decrease measured. Or, if you have the harness disconnected and the car is off, then you can see a smooth ohm (resistance) change as you operate the throttle. If there are any bad spots on it, then you can see it jump in resistance as you slowly adjust the throttle position sensor from no actuation to full actuation or wide open throttle.



    I wish you luck on trying to diagnose your driveability problem.





  • Duane Wong
    Duane Wong Jul 31, 2010

    the tps is attached to the throttle body and is operated by the angle of the shaft of the throttle plate on the side. It has wires going to it.

  • Duane Wong
    Duane Wong Jul 31, 2010

    Also, if you happen to have an OBD-I scanner for this car, you may read the % value of the throttle opening directly through the scanner. This is, actually, easier than using a multimeter and small backprobing paper clips, because it tells you what the computer is seeing at any given time when the ignition is on and the harness is connected to the tps.

  • Duane Wong
    Duane Wong Jul 31, 2010

    Is there a 'Service Engine Soon' light on?

    Even if there is an intermittent Service Engine Soon Light, the codes can be read from the computer's memory which can aid in finding the root of the driveability problem.



×

Ad

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Ad

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Will not start when its damp out. when not damp starts right away thank u mike


Astro won't start or very hard to start when damp or rain ...

www.topix.com > Chevrolet Astro
Aug 24, 2007 - Posted in the Chevrolet Astro Forum. Leave a ... 2000 astro, Hardstarting or wont start when wet, once started its fine. I replaced the cap, rotor, gas filter, next rain was hard to start but did after about 10 tries. ... I have a 2000 astrocargo van. 4.3 v6. ... look for a faulty coil. mine passed out in a rainy day.

Van won't start in wet weather - Chevrolet Forum - Chevy ...

chevroletforum.com > ... > Past Chevy Truck, SUV & Vans > Astro
Sep 22, 2007 - I have a 1999 Astro Van and nearly everytime it rains or sometimes when I wash it, it will not start. ... I really like my ASTRO for everything from carrying family, boat, trailer, etc. but if it is not resolved its going before someone gets hurt. ...When it was damp out, the coil case would become wet, and the ...

Jan 18, 2016 | 1987 Chevrolet Astro Cargo

1 Answer

1989 chevy astro van rough idle/runaway acceleration


There is a "spider" injection system in the intake manifold. Check that.

Mar 13, 2014 | Cars & Trucks

1 Answer

I turn van on and go the van boggs down then the service engine light turns on and it smells like raw gas


Does it only bogg down on acceleration or all the time? If its only on acceleration you want to check for any loose vaccuum lines leading to the intake. In addition you want to check the fuel pressure at the fuel rail and make sure that the engine is getting fuel. If so check the injectors. A clogged fuel injector or one that is leaking can cause the bogging issue and the smell of raw gas.

Oct 25, 2012 | 1994 Chevrolet Astro

1 Answer

My 1994 Astro EXTAWD 4.3L misses, runs rough,lacks...


sounds like you have either a bad head gasket or a cracked head

May 19, 2010 | 1995 Chevrolet Astro

3 Answers

1996 Astro AWD 4.3L V6 308,000Km engine hesitation/surging


tsb remove dist cap ,clean out breather holes i replaced cap and rotor at the same time. chevy has the problem with the 4.3l astro,s and blazer i have both.fixed the problem when buying the cap and rotor the directions inside will also tell you how to fix

Nov 23, 2009 | 1997 Chevrolet Astro

1 Answer

Astro van accelerate by itself


there is a recall i do bleve for you van for that

Nov 16, 2009 | 1994 Chevrolet Astro

1 Answer

1994 astro van


How do you know the fuel pump is good? And I would not keep using starting fluid to try and start the vehicle. Did you check fuel pressure? Did you try to dump a little fuel down the carb then try starting?

Aug 09, 2009 | 2004 Chevrolet Astro

1 Answer

1993 oldsmobile cutlass supreme engine stalls choking


soundl like idle air control valve sensor
try a clean .............if no better replace

Apr 30, 2017 | 1993 Oldsmobile Cutlass Supreme

1 Answer

1994 AWD Astro van overheated, then lost ALL power


it seems that the engine blew. the rings, rod bearings, main bearing etc. Sorry but it sounds like that. Especially the smoking at the exhaust. take it back to the one who sold it to you.If possible.

Feb 16, 2009 | 1994 Chevrolet Astro

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

317 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts

yadayada
yadayada

Level 3 Expert

76164 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

8273 Answers

Are you a Chevrolet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...