Question about 1991 Ford Taurus

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When held at 30 mph, the car surges and the tach goes up 1500 RPM

I just had some maintenance done on my 1991 Ford Taurus SHO. When I picked it up, it ran so poorly, I took it back. It surges, then backs off when held at a steady speed. The tach bounces at low idle and when held at a steady speed, the tach jumps up to 1500 RPMs without any engine speed change. Someone suggested the ECT. Does anyone think that might be the problem. There are no vacuum leaks. The crank sensor was just changed before all this happened and well as the TPS. Lots of hair tearing going on. If anyone has had the same symptoms, please tell me what you did to fix it. Thank you.

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6ya6ya
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Posted on Jan 02, 2017

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  • 491 Answers

SOURCE: low oil compression

if the needle is on or around the letter N then thats normal. you can also change the oil sending unit. as far as the engine light once you change the EGR valve and the EPT sensor the engine light should go off

Posted on Jan 01, 2009

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emissionwiz
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SOURCE: 2003 Ford Taurus wants to die when coming to a stop

TRY THIS AND LET ME KNOW IF IT CORRECTS YOUR PROBLEM
Here is the most common cause of surges and stalls at stops and low erratic idle speed and rough idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake

Posted on Mar 17, 2009

alorange
  • 30 Answers

SOURCE: Ford Taurus 2005 model. Too high rpms in idle.

check tps senser

Posted on Feb 11, 2010

ourhowse
  • 2007 Answers

SOURCE: Van bucks going down the

Usually "bucking" is caused by ignition. Timing or faulty spark plug wires. They will ildle fine, but when you start driving , the miss firing starts.
First, try aiming a timing light at the crank and see if the marks are jumping around, or staying in one spot. If they are jumping, the timing belt, or chain, depending on what we're dealing with, has jumped a cog.
If not, then try changing the wires.
As for the up and down idling, i would think you still have a vacuum leak. Try dumping some soapy water along the intake gasket while it's running, and see if it bubbles.

Posted on Oct 03, 2010

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