Will the Throttle Position Sensor create large and rapid swing in engine RPM?

5

Asked by Feb 14, 2013 at 04:41 PM about the 1988 Chevrolet Beretta

Question type: Maintenance & Repair

Howdy, my engine starts cold and races up to 1500 RPM.  After it warms up it again increases RPM to 3000.  I have read the engine light by ALDL flashes, however, the continual 1 long and 2 short continues flashing while the rad fan is on.  I have found the TPS is not attached to the TBI properly.  This vehicle did receive a new ECM in 2008.  I have not been successful in getting any flashing codes other than the usual reciprocating 12 with the fan on.  Any ideas.  Could a poorly mounted TPS cause the radical RPM behavior?  Other than the above this is avery good low mileage vehicle that has been well maintained by the purchasing owner.

1 Answer

113,285

Yes it could. Most tps are fed with 5 volts. The output signal wire should read about .5 volts at an idle and 4.5 to 5 volts at full throttle. As you move the throttle you should see a gradual increase in output voltage. It should be a smooth increase and decrease as throttle is moved. If it is not smooth or not registering the above voltages at idle or full throttle it needs to be replaced. Hope this helps.

1 of 1 people found this helpful.

Your Answer

Chevrolet Beretta Experts

  • #1
    unbelievableny
    Reputation
    230
  • #2
    Dan McCaig
    Reputation
    90
  • #3
    goldie11111
    Reputation
    70
View All

Related Models For Sale

Used Chevrolet Camaro
416 Great Deals out of 31,676 listings starting at $2,395
Used Chevrolet Monte Carlo
15 Great Deals out of 1,354 listings starting at $995
Used Ford Mustang
743 Great Deals out of 42,181 listings starting at $1,300
Used Chevrolet Cavalier
3 Great Deals out of 954 listings starting at $1,000
Used Toyota 4Runner
246 Great Deals out of 21,419 listings starting at $2,300
Used Chevrolet Corvette
244 Great Deals out of 22,068 listings starting at $2,500
Used Dodge Charger
417 Great Deals out of 27,620 listings starting at $1,650
Used Pontiac Grand Prix
37 Great Deals out of 2,754 listings starting at $1,200
Used Pontiac Firebird
8 Great Deals out of 806 listings starting at $3,295
Used Buick Regal
150 Great Deals out of 9,889 listings starting at $999
Used Pontiac Grand Am
1,090 listings starting at $1,599

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.