Question about Ford Taurus

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Car "jerks" at wide open throttle at 40mph and 65mph Has new trans/tuneup/coil/air mod/

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If it is front wheel drive, I'd check for worn CV joints. The slack could produce the ****, you refer to. Also, high mileage on the transmission can also produce the ****. If you have either of the above symptoms, stop driving the car at full throttle, or something will break.

Posted on Oct 09, 2010

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Throttle stuck wide open , all the time.


Since you didn't provide a year and model, I can only generalize. Make sure the buttery-fly valve is moving freely and not binding, then check the idle air control valve, if the idle air control valve is stuck open, the car can actually drive upwards of 40mph without stepping on the gas.

Oct 17, 2015 | Cars & Trucks

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I have a 96 eclipse 420a. Ive replaced tps, coil pack, crank pos sensor, and relay, new plugs and wires, cleaned map and IAC. Car starts right up drivers good. Then after driving 20 mins car looses po


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Oct 21, 2014 | Cars & Trucks

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Wiring diagram


are the A/C fuses good? what transmission, auto or stick?
the first check is , does the compressor, cultch, engage
and spin the actual compressor main shaft at full speed.
yes, then loop is bad. (freon loop) (fan good)
No, then below is wrong. (electrical)
94/metro/swift
did you check pressures yet?
if not , then the hi/low limit switch may be open killing the compressor
so it dont self destruct, never bypass this limit switch.
the High low switch if open kills DC power to the A/C main relay. coil.
coil yellow wire must be at 12vdc or the loop has wrong pressures.!
dig,. it refuses to destroy its self. so kills the relay.

all posts, USA.
does the A/C lamp on dash turn on? if not the blower is dead.!
on the 94,(i dont have 93 drawings)
you can get better drawings for 94 at alldata.com, any time.
yellow wire is hot. (clutch dead)


the next point of failure is the car has throttle pedal switch
that is closed all time but wot, wide open throttle cuts AC.
so this switch can fail and cut A/c (USE A VOLTMETER) opens.
the clutch has its own relay, that is controlled by
the A/C amp module (better name A/C logic module)
it cuts A/C for many reasons.
we use a voltmeter at the AMP mod..

inputs that can stop A/C compressor, are:
1: engine overheat sensor bad. 0v , goes to 12v at 235F engine temp.
pin 9.
2: pin11, not 12v means dash lamp out
3: pin 5, transmission cut, or throttle pedal cut out (WOT).
4: pin 4 and 10 , evap core iced up cut, thermister sensor.
5: pin 8, lost 12vdc power.

The TCM cut out , to pin 5 is just for automatic trans, with TCM shifter electronics, it sends cut when the trans detects overload.
(hills? or tranny goes to limphome mode, {sick})
see amp below.
that is it, for electrics. answer my first questions for better answers.


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Mar 31, 2014 | 1994 Geo Metro

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I have a 97 ford probe 4cyl. I'd like to adjust the tps with a voltage meter, but want to be sure I do it right! My check engine light isn't on but car idles rough. I've had the tps replaced in...


wheather your a2 .0 or 2.5 at idle key on engine off its is 0.7V to 1.1 V. you test it by doing a sweep, with your volt meter,voltage should increase with smooth throttle movement there should be no drop out or glitches and at wide open throttle you should reach 4.5 V , (***) wide open throttle

May 07, 2011 | 1995 Ford Probe

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Hi.seat ibiza 1.2 3 cylinder 2002 when touching the throttle at about 40mph car is jerking, i have changed coil packs and plugs, can you help please? also cleaned egr valve and checked pipes.


there is a problem with the timing chain tensioner on these models, which causes poor driveability, normally the engine management lamp would be illuminated too

Jun 09, 2010 | 2002 Volkswagen Jetta TDI

1 Answer

2001 mercury grand marquis. Engine stutters or hesitates with jerking when lightly accelerating. Seems like an air, fuel, or spark delivery problem. At wide open throttle this problem is not as noticeable....


Start car and use a squirt bottle of water to wet the wires and coil, if you see it spark or run rough one or both are bad, repair the wires first as they are more common.

Aug 02, 2009 | 2001 Mercury Grand Marquis

2 Answers

Slow takeoff


Fuel filter, air filter , timing, faulty wires, plugs, vacuum leaks, egr, low compression, brakes binding,, tranny fluid low,... start checking!

Jun 19, 2009 | 1996 Geo Tracker 2 Door

1 Answer

When I start up my car, it is jerking alot. It feels like it is going to stall. After about 5 minutes it stops.


Try cleaning the MAF sensor. Remove the sensor and clean it with a good electrical cleaner or MAF cleaner then let it air dry or use light shop air.Then do a couple of wide open throttle burst to reset the baro and should take care of it.

Mar 01, 2009 | 2001 Ford Mustang

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