Question about 2001 Audi A4

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Engine tempmeter erratic. works now and then.

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Couple possiblities your e.c.t is failing that sits on the back of your head if you can see it. it should have a green sensor that sits in the coolant flange with a 4 wire connector on top of it. there is a cir clip that holds it in place. If you are not getting much heat out of you heater then there is a good chance you thermostat is failing. it is opening to soon not allowing the car to get up to temp. if you temp gauge drops while on freeway that is a good chance to the problem . If all those check out it could be a bad instrument cluster that is the last and most expensive. and not a very normal issue. is you engine a 1.8 or a 2.8 or the 2.7 bi-turbo? hope that helps good luck

Posted on Sep 12, 2009

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Posted on Jan 02, 2017

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Transmission hard shifting between first an second gear only when this happens the tachometer goes erratic


You have a engine RPM sensor that is not working correctly. Computer thinks you have push gas pedal to the floor and is providing that type of shift. It may be the sensor attached to your gas pedal has worn out.

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I have a read screen on my 2001 Jaguar S- Type that says " Fail Safe Engine Mode. What does it mean


Hi, fail safe engine mode means that the ECM (Electronic control module) or computer box as some know it, is running in a mode whereby it is bypassing a particular component in the engine that has gone faulty in order to keep the car from cutting out, or has picked up an erratic function in any component, which is more than likely an electrical problem and could be one of the following which have to be checked by computer analysis equipment at the Jaguar agents or any one else that is familiar with the process that is required to trace the fault. Here are the possible causes: 1.Erratic wire connection 2, Engine cooling Fan thermal switch. 3. Control module 4. CKP sensor 5. Computer box not functioning correctly (a rare fault) 6.Engine coolant fan not working, or running erratically. Unfortunately only a computer analyis will depict the location of the fault and if the repair man is very experienced will be able to sort it out quickly with the computer analysis.( Although I strongly suspect it to be the cooling fan thermal switch which is working erratically and will soon fail completely.)
So get your car to the experts as soon as possible especially if it could be the cooling fan thermal switch, which could cost you a major expensive engine repair job if your Jaguar overheats.
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I have a 1997 Grand vitara V6 2 Litre The check engine light has been coming on intermittently for some time but has been okay.As of yesterday the engine RPM at idle has been very erratic rising and...


Hello and welcome to FixYa!

If the check engine light is on then there's definitely a problem. The engine rpm is erratic right? This can be caused by a faulty MAF (mass air flow) sensor. If the MAF sensor is faulty the idle will surely be erratic and may cause stalling.

You will need to have it replaced to make the vehicle back to it's normal operation again.

Hope this helps and thank you for using FixYa! Have a good one!

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1 Answer

ERATIC INJECTOR PULSE NO START


You describe an electrical issue. First of all, how do you know the injector pulse is 'erratic'?
Is the ignition spark ALSO erratic? If so, how so? I need specifics, details regarding your description of 'erratic'. I can assume/presume you have experience/education/training in automotive diagnostics... ??

In my electrical/eagelectronics experience, you definitely have an electrical/electrodynamic problem/issue.

Tell me what you've done, diagnostically, to determine (isolate) the 'CAUSE' of this erratic injector pulse. What have you inspected/checked? What have you NOT inspected/checked?

Get back to me, then we can go from there.

However, first thoughts
The engine management computer (ECM/ECU/PCM) can cause/create the symptom you describe
The engine wiring harness also (chafed wires, bad ground circuits, etc.)
Malfunctioning senors (Crank Position Sensor (CKP), Cam Position Sensor (CPS),
Low Voltage Condition, etc.

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Abs light came on and odometer and speedometer stopped working. What can be the cause?


This is one thing that can cause erratic and wierd problems. You have a ground strap that connects the engine to the frame, if that were broken you could lose a ground and erratic electrical things could happen. It's a possibilty. Good luck.

Jul 01, 2009 | 1998 Ford Windstar

1 Answer

97 NZ new, Nissan Sentra Q with erratic RPM indication.


do you mean the speedometer or the engine RPM ----gearbox??? if its the engine RPM their is no sensor as it reads from the ECU unit which is controling the engine management

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Engine lopes while idling or idles erratically


vaccum hose back of intake manifold, check elbow rubber fitting for any cracks.

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99 buick century won't start, no lights, gauges erratic


hi there its the main fuse in the engine bay i think

Dec 15, 2008 | 2001 Buick Century

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95 honda accord v6 tach erratic and sometimes zero accompanied with minor power flucuations.


Hi ....
On your HOnda accord V6.
The rpm is generated from the Distributor.
The more possible problem for erratic RPM is the cam sensor inside of the Distributor. But I guess you can't buy just the sensor.
And can afect the engine performance.

OK. I hope this information work for you.
I work on cars everyday. Thank you for use fixya.

Jul 17, 2008 | 1994 Honda Accord

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