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1998 Zetec 1.25 DEAD spot under acceleration, When I accelerate between 2000-3000rpm the car just looses all its power if I keep the accelerator pedal down it eventually gets its self going, Theres a dead spot there I did a service in anyways OIL,OIL Filter, Fuel filter(Thought it could be the problem) I had a look at the plugs they look good and at the throttle body it seems clean inside, Any solutions as to what it can be?

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Check and clean the Idle Air Control Valve motor on top of the engine. Use Goo Gone (mineral spirits or turpentine) with Q-tips to clean out any sludge and replace it after letting the part air dry for about 10 minutes (flammable liquid). You may also be able to tab this item hard with a screwdriver without removing it if you just need a 'temporary"
fix to get you down the road. Also, you will want to check for pinholes or soft squishy rubber hoses between the motor and PCV valve in the crankcase. Any hole in that hose route will cause vacuum loss, stalling, erratic idle, etc.

Posted on Aug 05, 2010

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Most likely the throttle position sensor or Mass Air Flow sensor

Posted on Aug 05, 2010


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Vs commodore lossing revs under quick accelaration. Not spark plugs, not leads, not coil pack, not engine computer and not fuel system because it happens on both gas and fuel

there is no mention of a fault code reading ( very important as you will see)
you have covered everything and in doing so are overlooking logic
you have a dead spot on acceleration so by looking at possible areas of concern , there are 5 not mentioned
One is the accelerator position sensor
Quick acceleration may be causing a problem in that unit but the quick movement
next is the throttle control position sensor Problems there can be from faulty voltage from the APP , wiring or even a sticky throttle e action
Next is the ECM or a section of the ECM
The ECM controls the fuel/gas to the engine and you state that there is not a fuel/gas supply problem, the ECM gets its air /fuel ratio settings from the heated oxygen sensor in the exhaust manifolds before the cat converters, mass air flow sensors, volume air flow sensors, barometric sensor and ambient temp sensors
So logically if any of those sensors are not reporting in a timely period then the ECM becomes a bit confused and the dead spot will occur until it gets a second to recheck the parameters set in the CPU
Slow acceleration , is ok as the ECM is continually tuning to the throttle position but fast acceleration is throwing the system out
Lastly , in the Ignition control module there is an electronic advance / retard program that adjust the timing to exactly the correct rpm and throttle setting and if that unit has a fault , that is as if the timing is being retarded initially under the acceleration
another unit that has input into the ECM that reports on engine timing is the knock sensors that stop detonation ( pinging)under heavy acceleration by reporting the engine noise to the ECM which adjusts , timing and air / fuel ratio to prevent engine damage from the detonation

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1 Answer

1999 Chevy Metro LSI Loss of acceleration power, on take off only. I have no acceleration power up to the speed of 10 - 15 MPH, after that the car runs fine.

Could be a dead spot in the tps or maybe it needs adjusting.
here is a procedure to adjust:

0900c152800488e3-j1axptdruxmkgupulmd503d3-4-0.gif . Fig. 1: Throttle position sensor testing
  1. Connect a digital multimeter to the throttle position sensor terminals 1 and 2. Measure resistance.
  2. Insert a 0.012 in. (0.3mm) feeler gauge between throttle stop screw and throttle lever.
  3. With retaining screws loosely installed, turn throttle position sensor fully clockwise, then slowly counterclockwise until digital multimeter indicates 0 ohms (continuity).
  4. Tighten screws to 18 inch lbs. (2 Nm).
  5. Insert a 0.035 in. (0.9mm) feeler gauge between throttle stop screw and throttle lever. Digital multimeter should now indicate an open circuit (no continuity).

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2008 zetec Focus 1.8, slight miss fire when accelerating in fourth gear, pulling onto motorway yesterday and tried to accelerate and it was as if something was holding me back

A miss under load on a Focus is usually a bad or failing coil on one or more of the plugs.Also how old are the spark plugs?

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My 01ford focus zetec lacks power on hills and accelerating. New gapped plugs, coil and harness, MAF sensor. Have new EGR, keep swapping old and new, improves performance temporarily.

check fuel pressure with a gauge as well as fuel volume. pressure should be around 35 lbs and the volume should be about 1 litre in 30 seconds. if its not then this can cause poor power going up hills and accelerating. how long has it been since the fuel filter was changed.

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Starts missing /large dead stop when accelerating

The missing while accelerating is likely due to ignition coils and/or spark plugs going bad. The missing while in park is a normal thing. The car has a rev limiter that will not allow the engine to rev to higher than 3000 RPM while in park.

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My car starts but will not accelerate, when accelerator is press car dies

many things could cause that first you have to check accelerator cable.second the fuel goes through the filter easily(fuel pump) ,plugs,.And is the car coil system and throttle sensor .

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well it sounds like its time to change the timing belt.

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2001 Ford F650 with 7.2 Cat deisel acceleration problem

Check your TPS Throttle positioning sensor. Sounds like it has a dead spot in it or it is failing. May also be a wiring harness issue or loose connection at TPS too! If its intermittent then it will soon go out completely. It should be located on your fuel pedal. Remove it and check it with an ohm meter. Check resistance all the way thru from 0-100 percent. When it is not working it should do nothing and show no resistance. When it is working the resistance value will increase and or decrease as you turn the sensor.

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95 ford mustang

The throttle positioning sensor can do this to your car. Have it checked out voltage wise A flat spot will affect drivability

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