Question about 1999 Dodge Neon

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Code 1491 The problem is the engine lihgt is on. The car run great only wend I turn the AC on the car slow down the RPM goes up and down. Today I chage the catalicti converte is was bad! but the engine light still on and I get two codes 1491 and 1492

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  • El pelon Jun 18, 2008

    So what I do to get the engine light go a way!


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1491-radiator fan relay control circut
1492-ambient/battery temp sensor volts to high
check and make sure your radiator fan is coming on

Posted on Jun 19, 2008

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2007 chevrolet impalahave a 07 impala runs great till ur rpm meter goes past 4000rpm then drops down to 0 runs bad after shut down engine for around 10 mins then runs good again check with scanner no

It needs a scanner on it to find the problem while driving it. Several things can cause this. At 4000 rpm's in park the ecm will suppress the engine. this would be the Neutral safety switch. So going from there, if not the switch, it could be wiring or a bad buffer in the ecm.

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1 Answer kia avella rpm reaches for about 1200 rpm when I start up in the morning and gradually decreases to about 600 rpm.but it takes 10 mins bfore the rpm goes this normal?m And my engine loses...

Yes, that is normal operation for an engine. It needs to run at higher idle when cold and the computer does that through the temp sender. Make sure it's not excessive due to any vacuum leaks. This and the AC power loss would be exaggerated if the engine is not running correctly.

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Overheating problem, what is the most probable cause?

You need to stop using it immediately before you
cause some damage or more than you may already have
That is just common sense. It should not overheat or
be any different than it was in the past without problem

The car has to be checked over/diagnosed,tested,etc for
various issues to resolve

Borrow or Rent a car until resolved

No way to guess at the problem

You should have some type of codes avail even
if the check light isn't on,you need professional help
to get a start on resolving

The timing belt maybe worn & jumped or the head gasket

Over heating isn't usually a cheap repair unless the thermostat
sticks partially closed

The RPM moves around the car is 11 years old,so it may just
need a though going over

Timing Belt,O2 Sensors,Exhaust Converter,Spark Plugs
and such

If you depend on a repair shop to do things & don't
have the knowledge to request work done throughout
the year,then you run into a lack of proactive preventative
maintenance situation. Most things are simple looking
back, once resolved

Sep 06, 2012 | 2002 Chevrolet Prizm

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If i turn on my a/c my car will be shaking

It can also be your throttle body is really dirty, bad sensor.When you turn the air on, does the engine speed increase, especially according to the tachometer? if not,I would check the simple stuff.Have you had any tuneup work done lately?If not,you might want to checkout the tune up items.Distributor cap,ignition rotor,spark plugs and plug wires.Sounds like you are overdue for a tune up the idle is supposed to increase when the ac is turned on. it is possible this is not working or the idle is too low. the car have compensation systems to increase the rpm when the AC is loading the engine, and slowing it down. Newer cars idle speed often isn't adjustable, so the problem's in the ECM (computer) or a sensor. does the car idle on correct RPM, should be around 700 with no AC on. If its run below 700, you might need to adjust your rpm up, however, try to get a tune up first and get the RPM to the proper spec. if the engine already running low RPM, it will drag the engine idle down very low which will cause the engine to shake or stall.

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My PT seems like the engine is trying to stall out while im driving...but if I slow down it stops. It has been running fine all week and this am, went to get lunch today and it started doing this.

on the power steering rack is a sensor to increase the rpm on idle so AC and power steering doesnt stall engine ,its located on the top of the steering rack ,sorry feeling tired so iam to bed in this time zone

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While idling, my pt cruiser rpm goes down with air conditioning on. The car sputters like its about to stall.

its not being told to speed the idle up under load ,now on the back of the steering rack just behind where the steering goes into it is a sensor that increases the RPM on idle when steering is turned but i have found that if this sensor isnt working not only does steering slow engine down but also AC ?? why when they are not related i dont know i just know it does ??

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Hi i have a 1999 vw passat 2.8 v6 and the problem is that my car does not accelerate as normal,it goes up to 1500 rpm and 2000 rpm and it goes up and down,if i step more on gas it passes the 2000rpm but...

p1545 is a throttle control malfuction code

You can try to reset the throttle body by opening the hood and drivers door then turning your key to the accessory position. You will hear the throttle body whir and click. It may take up to two minutes. Afterward, the car will relearn your habit of driving and adjust accordingly.

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