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2002 sable gs intermittent electrical "spike"

While driving the engine "skips", the speedometer spikes upward - at idle it jumps to about 25 mph - and there is an audible pop through the radio as well audible alternator "whine" through radio just before and after "pop". Sometimes the Security light or the Low Fuel light comes on, sometimes not. but NO check engine light illumination thus far. frequency of occurance of problem is increasing daily.

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Posted on Jan 02, 2017

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SOURCE: 1997 Mercury Sable GS

Two possible sensors could be affecting it like the TPS or MAF sensor. The Throttle Position Sensor (TPS) might have a bad spot where the ECM won't get signal properly and causes the RPM to fluctuate

Posted on Aug 14, 2008

  • 51 Answers

SOURCE: boost spiking/ over boosting

replace the wastegate vacum lines or wastegate acuator. if they leak it raises the boost. Let me know if its not that.

Posted on Jan 12, 2009

  • 22 Answers

SOURCE: rpm`s spike up and down

I don't wanna laugh but the Vibration of the defrost is probaly wiggling a connection --most likely a harness ground on the engine bay firewall ---I'd check the grounds then the throttle position sensor connector connection and then the --Don't laugh distributor connections to inlude the engine to cab ground cable ---braided bare cable from the block to the firewall -

--the COIL pack may have a poor connection ---and I believe if correct on blazers the feed wire to the coil from the harness
is thick and pinkish that connection if loose describes the symptoms exactly

nothing works without a sufficient GOOD gound --loosen and retighten and ground wires-positive wires and connections ----GM is well known for wiring harness problems ---my 84 blazer
happened to share the same ground for the Blower motor and the distributor ---not anymore!
check your connections and those grounds --am I repeating myself ---and also continue to seek help in here if still persisting after that ---should only take 15 minutes to check it all
30 to fix most likely
hope this helps

Posted on Apr 06, 2009

  • 21 Answers

SOURCE: 2002 Mercury Sable-shakes with acceleration

You describe this as an acceleration problem however, if the car does throw a check engine light it should be recorded in system memory so it can be pulled by scanning with and OBDII scanner. It sounds as if the car is being starved for fuel on acceleration. Check the fuel lines for kinks as well as check the fuel pressure. The problem could be a faulty fuel pump that has yet to completely die.

Posted on May 21, 2009

  • 1776 Answers

SOURCE: replaced alternator and battery 2x and only works for short time.

This could be caused by a faulty voltage regulator, but since it has happened on more that one alternator, that can't be the problem, right? The next thing that I would look at would be a defective or loose belt. Also check the tensioner to make sure it is working properly and is keeping tension on the belt. If the belt is slipping or is worn out, it will cause voltage fluctuations. You may want to look at changing or at least inspecting the belt. Hope this helps and best wishes.

Posted on Aug 27, 2009

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