Question about 1999 Chevrolet Astro

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Trans jumps when accelerating out of 1st gear. This makes the service engine light come on.

I have an 99 Astro Van and the service engine light has been on for quite sometime. It would only stay on for a bit before and go off. I took it to the shop and was told it was sensor in the trans causing it to go on. When accelerating and getting out of first gear it would jump but after that it runs fine. Well I had the shop reset it so I can get my emissions test. It did pass with no problem. Well it's that time of the year again. Does anyone know how to reset the light and what is making the trans jump after first gear?

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  • 252 Answers

I don't know what's causing the jump but, to reset the light you use an OBDII scan tool. Some parts stores like Autozone and Advance will read the codes for you for free. You could ask them to reset it after he reads them.

Posted on May 13, 2017

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6ya6ya
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Posted on Jan 02, 2017

SOURCE: Starting Problems with a 1995 chevy astro 2wd 4.3 L

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Posted on Nov 04, 2008

  • 84 Answers

SOURCE: Bizarre shifting pattern 1984 Mercedes 300D automatic

Hello, The adjust of your t/v cable, not kickdown cable, and the operation of the vacuum controller at the rear of injection pump, and the modulator, is critical for this car to get a good shift.
Put you cable back on, adjust it so that when you have wide open throttle, the cable does not have any slack. Check the black vacuum line by the oil filter housing that goes to the modulator to see if it has vacuum. It should have about 10-15" vacuum and as you increase engine speed it should drop. If you get close to this, the trans should shift ok. If you cannot get vacuum at the modulator line, you need to ck vacuum supply, valve at rear of injection pump, hose routing, etc.
If the B2 piston failed, it would be difficult to move car or slip badly. Also, take into mind that at the bottom of your accelerator pedal stroke is a kickdown switch.
If you accomplish what I instructed, you will probably get a decent shift.
If you find this information to be correct would you please enter a "fixya" rating.
Thanks, Gator241

Posted on Feb 12, 2009

csmock132
  • 4669 Answers

SOURCE: 97 suburban only shifts out of 1st gear when

Do you know if you have a 4L60E or a 4L80E?

Posted on May 06, 2009

MrSocket
  • 117 Answers

SOURCE: Need diagrams for 88 Jeep Wrangler Auto Trans

Your public library will have a manual covering your mechanical repair. Moreover, they have the automotive shops online software called AllData. It is the best auto technician database available today. You can print out specific troubleshooting procedures, diagrams, step-by-step istructions, and soforth. The typical person cannot afford to pay for this service, just automotive dealerships, etc... that is why the public library made it available to everyone and for free to view and print out material. This should Fixya! Good Luck!

Posted on Aug 28, 2009

SOURCE: 1999 Chevy Astro Van. Don't know exact model # of

You should have a 4l60E in your astro van. Which is electrically controlled, so no vacuum modulator. However, to address the ventilation selector not working... look for a vacuum line exiting the firewall and going to the passenger rear of the intake manifold. You will likely find it broken or disconnected there.

Posted on Dec 03, 2009

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1 Answer

Why won't it accelerate past 10 mph?


which engine? is traNS AUTOMATIC OR STICk?
IS TRANS STUCK IN 1ST GEAR?>
hot or cold? or both (engine temp)
is transmission slipping? (if stick clutch slip)
(eg: engine rpm races, and speed dont increase) called slip.
is it slipping?
or is engine misfiring? (tune up, times skipped?)
or is engine bogging, (feels like dragging 10,000 pounds)?
the engine light means, (get car serviced now)
or if savvy and a DIY person, it means SCAN it now.
easy huh>?

its trying to talk to you, so listen to it and scan it.
then post the DTC errors.
keep in mind we are deaf and blind here. so miss 99% of all key facts, and evidence on car. that your living mechanic sees , feels and hears.,
so dont expect magic here, there will never be that, here.

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How many miles on the vehicle ? Ever have trans flush and service done ? Any lights lit on the dash ? May have codes stored in PCM , As this is computer controlled ! You should take to trans. shop. This is not something for a do it your self job .

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1 Answer

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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.

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If the van is an all power, Have your alternator checked. DO NOT remove battery cable while running to check alternator. You definitely will need a new one then. they are sensitive to voltage changes, if voltage drops much will lock auto trans in 1st gear & various others things will stop working that draw much juice. Anything under 11.7 volts will trigger trans lock into gear on these vans. Autozone & O'Reillys checks them for free if you bring it to them.

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