Question about 1999 Chevrolet Express

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Bad alternator/Computer damage

I had an alternaror go bad. The last time I drove it, the speedometer was unstable, the engine would miss, the trans shifted eraticly, the ABS light lit. I'm afraid the alternator damaged the ECM. The alternator has been replaced along with the belt tensioner and idler pulley. The same still happens.

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I checked all the fuses I could find. I suspect I have missed a few. I just recieved a set of factory manuals on this thing. Talk about information overload. 4 large books. I'm going to be busy for a while.

Posted on Nov 04, 2008

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Check all fusr inside & under hood mine did same was blown fuse

Posted on Oct 20, 2008

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I have a 97 Sable and battery light came on and everything started going wacky. Lost all guages, speedometer, RPMs, etc. All lights came on my dash. Then all my lights went out and the car died. I was told...


that's becasue the new abattery went dead because it was not charging. The battery light must be OFF to charge the battery. Take it back to whoever fixed it. May be a bad wire betwen battery & alternator too.

check the 175 amp mega fuse in the engine compartment.

cehck this ground for a good connection - G104
Left front fender near air cleaner

check the 20 amp fuse for the charging system. Fuse 26 in teh engine compartment fuse box.

Aug 16, 2011 | 1997 Mercury Sable

2 Answers

Engine seemed to skip at about 70 mph and service engine light came on. Then seemed to skip several more times at different speeds. Ran fine. Just continued to skip as we drove.


hi the engine is not skipping the problem is the engine is miss firing
that is caused by a bad .spark plug or -wires-or coil pack - when was the last time the
car had a tune up . check spark plug connections

Jun 12, 2011 | 2005 Nissan Altima

1 Answer

The speedometer in my 2005 mustang stop working what could be wrong... peter


Most of the time when the speedometer stopps the odometer stopps too it it has the transmission may have troble ( if it's automatic as the speedsenser helps the trans shift as the computer shifts the trans too. the check engine light should be on also if it's not and the odometer is still working the problem is in the speedometer itself and the unit can be shipped off though your ford dealer for repair but I woould'nt do that till the speedometer has been removed unplugged and replugged in to see if it's just a bad connection. The speed senser can fail too but you will have these other problems tha I mentioned. The senser is on the side of the transmission nesr the place the drive shaft is connected to the transmission. If the automatic transmission shifts normally and the check engine lightisn't on the senser is likly to be good.

Feb 28, 2011 | 2005 Ford Mustang

1 Answer

My 2003 ford explorer bucks when going down the road - but only with snow or rain present. Sometimes, it bucks hard with a hard braking feeling...Sometimes softer like an engine miss from bad spark plug or...


well you should do a diagnostic code check. although a code read will not show things like , bad air filter causing motor to mis fire, it will not detect a bad intake gasket, it will not detect a bind or bad chain gear in trans or axles. but it will give you a better understanding with the motor condition and then you can start eliminating causes till you get to the problem. I wish the best to you

Jan 17, 2011 | 2003 Ford Explorer

1 Answer

Hi: I have a 1998 Chevy Box truck. I was told that the computer is bad becase each time I drive it, the lights flicker on the dash board and the head lights. Now today I noticed when I drove it, the...


i would first have alternator and battery checked
if either is bad it is not keeping up the demand for electric current which will in turn cause lights to flicker and computer to malfunction

Jan 04, 2011 | 1998 Chevrolet K1500

1 Answer

1999 ram v6 abs and brake light on, drove a block


Sounds like your alternator died. Check wiring, fuses and replace alternator as should test bad.  $80.00 at a scrap-yard should be a general price for used.
Back-yard mechanic should install for $20.00
Good luck. 

Jun 09, 2010 | 1999 Dodge Ram

1 Answer

Speedometer stopped working 2. Door locks problems 3. Check Engine Light 4. Gear Shift Indicator lights stopped working 5. Engine revs high past 35mph on 1995 GMC SIERRA Truck


you need to scan this truck if you have a vss input to the computer then you have a bad trans or a bad vss sensor if no input you should also check the trans range sensor with the scan tool

Mar 10, 2010 | GMC Sierra 2500HD Cars & Trucks

3 Answers

The speedometer quit working and the transmission quit shifting at the same time.


It sounds like the Vehicle Velocity Sensor (V V S) has gone bad or the wire harness has gotten damaged due to corrosion. The V V S sends signals to the ECM which will indicate to the transmission when to up and down shift according to the engine speed and will send signals to the speedometer. The sensor is on the driver's side along the tail shaft if the transmission, good luck and keep me posted. Auto Zone will have the sensor and give you the step by step instructions and should take no more then 15 min to replace, it's held on by one bolt and the wire harness just unclips.

Nov 02, 2009 | 1994 Chevrolet S-10 Blazer

1 Answer

01 GTP Supercharged -recently R & R trans but having same prob.


check on side of trans, should look like sensor with electrical connection, run scanner for trouble codes

Sep 20, 2009 | 2001 Pontiac Grand Prix

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