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Low voltage when driving

94 gmc 1500 5.7 engine Starts and idles like a new truck...put in forward or reverse, you may get 20 feet, maybe go half of a mile and bang, the voltmeter slams over to the left 8 - 9V and the engine stalls. Battery load tested, new alternator, charging fine. Suspect this condition ruined the old alternator. Researched and going to check and clean grounds. My 1st to 2nd gear shift solenoid is faulty, have to shift it like a manual. Read someplace that this could be shorting out in the transmission pan? If it was a dead short in wiring would it not blow a fuse? Thanks

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

jrod1125420
  • 161 Answers

SOURCE: transmission shifting funny.

sounds like either your transmission is having problems with the valves...might want to have that looked at before your transmission dies completely......also have them check vacuum lines as i believe that car uses vacuum pressure to shift.

Posted on Oct 01, 2008

SOURCE: 94 dodge neon auto tranny

Hi,

Here is some possible reasons why your transmission is having those problems .

* The gear shift linkage is binding
* There is an internal problem in the transmission
* The throttle cable is broken or disconnected
* The vacuum modulator on the transmission is faulty or the vacuum line is damaged
* The electronic transmission control circuit may be faulty

Posted on Feb 26, 2009

sfparker
  • 170 Answers

SOURCE: 1997 Chevy 4L60e Transmission Shift Problem

How many miles? Have you maintained, serviced trans in past or just waited for this day to wonder what happened?

Posted on Sep 28, 2011

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Hi,

Improve the Fixya.com experience for everyone by voting!

It sounds to me like your idle relief valve is malfunctioning. This little device pictured below does a lot of good things but is a pain when not functioning.





2q==




• Regulates the amount of air entering the engine during idle.
• When not replaced, vehicle could experience high or low idle, engine dies at idle and/or severe high idle possibly causing internal engine damage and safety issues.
• Designed to meet or exceed OE specifications in form, fit and function.
• Global coverage for import and/or domestic applications.


The Wells Company offers extensive application information and technical support via its Tech Line at 1-800-558-9770, as well as in-depth product and repair videos at www.wellsVE.com and through the "Wellstech" channel at www.YouTube.com .

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Your 94 should be a 350 engine,is it?
That would be a timing chain,which means the distributor cap was removed to locate cylinder 1,
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