Question about 1999 Chevrolet Malibu

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1999 chevy malibu 3.1 rough idle only win car is in park not as bad win its in drive did a full tune up no check engine light on 0 codes has lots of power I just don't it i check for vacun leaks none found at this time ran some fuel injector cleaner no luck still the same fuel pressure is fine map sensor and tbs are all working had all sensor tested cleaned out egr

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Clean your iac (idle air control) and then replace ignition plug wires and clean off terminals on coils before putting new wires on, use scotch brite pad or equivelent. could also be intake gaskets leaking, did you notice 1 or more spark plugs cleaner than the others when changing them, sign of burning coolant

Posted on Feb 08, 2012

  • morenomike53 Feb 08, 2012

    Cleaned out idle air control old spark plugs looked fine car had full tune up plug wires spark plugs fuel Filter air filter check for intake gaskets leaks non found I just dont get it

  • morenomike53 Feb 08, 2012

    1999 chevy malibu 3.1 dose any one know how to test fuel pressure regulator plz help thanks

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My 2004 chevy classic cuts out sometimes while driving down the highway, does not do this when I press on the gas, also idles rough especially while in drive


If your car has over 100K on it, you will need to go and have it tuned up and the throttle body cleaned and spark plugs changed, my 2004 acted like this and I did the tune-up and it solved my problem.

Jun 17, 2014 | 2004 Chevrolet Malibu

1 Answer

1995 jeep gr cherokee laredo jumps when first star in morning and runs rough when ac or heat on


my guess, car unseen.
car has an A/T trans, and all A/T jump from park to drive
selection is made on a cold engine, due to the very fast idle speed.
what was the park and cold idle speed. and out door temps.
the lower out door temps, make idle speed , cold engine, even higher
but when the engine reaches 180F or more and holds, the RPM
is about 800 RPM (the FSM tells the exact amount and does vary for the unstated engine option) so at 800 the tranny don;t lurch, did it on a hot engine. so if idle speeds are wrong say so and say it with engine temps. or its all meaningless.
next :
runs rough, the engine (even parked?) is called misfire.
misfire on a good engine (full compression)
is:
1: bad spark (or never had a tune up ever) every 60k miles.
2: bad fueling. too rich, too lean (low idle) bad injectors (stuck or clogged, or wrong fuel pump pressure or bad Fuel pressure regulator)
3: bad fuel.

there is a test for each possible failure. all very simple test.
it takes $80 in gauge tools to find engine problems.

Dec 30, 2013 | 1995 Jeep Cherokee

1 Answer

1998 volvo s70 runs rough after tune up


Could be, but you will need to check for trouble codes, since the engine light came on. The code or codes may help you troubleshoot it.

Dec 11, 2013 | 1998 Volvo S70

1 Answer

Rough idle, rough in drive


Is the check engine light on ?
Have you checked the computer for trouble codes ?
You could have one bad spark plug even with only 30k on it.
Problem could also be a dirty injector.

Feb 18, 2013 | 1999 Ford F150 Regular Cab

1 Answer

Rough idle then stalls


Vacume leak or bad idle motor. With the car in park and running with the hood open listen for leaks moving your hand around the different hoses looking for a change in the sounds that you hear. The idel motor also makes the car idel up to 1500 RPM or so right at start-up then idel down, If it doesn;t the idel motor is likly. Check engine light is on when running? Test for codes, Follow code test charts don't skip any steps!.

Nov 02, 2009 | 1998 Chevrolet Malibu

2 Answers

1999 pontiac grand am 4 cylinder rough idle, rpms fluxuates


Most likely your throttle position sensor is faulty. You could have a vacuum leak as well. Most probable cause is a bad sensor. Is your check engine light on? Have you checked your engine codes? You can go to autozone.com and register for full free online repair manual.

Sep 14, 2009 | 1997 Pontiac Grand Am

2 Answers

Chevy 350 express van 2000 runs great idles rough


If it does not do it in park or neutral, it could be a number of things. One being a sticking Torque Converter Clutch solenoid (TCC). It could be that it needs a simple tune-up. How often does this problem happen?

Jun 29, 2009 | 1996 Chevrolet Suburban

1 Answer

Check engine light came on and now shifts hard from park to drive


The engine light is telling you, you have a transmission problem which sound like a shift solenoid. If you take the care to a local garage or dealer you can have them scan the vehicle for the problem code, which will tell you which solenoid is bad.

May 26, 2009 | 1999 Mazda 626

1 Answer

Speedometer, check engine, hazara and tcs lights stay on,


Hi,
It ken be many problems,bad contact ,clamping force,tcs/abs unit.
The best you ken do is conect the TECH2 to check def.codes!

Dec 20, 2008 | 2001 Saab 9-3

1 Answer

93 cavalier vibrating


your probably feeling a rough idle of the engine. need a tune up?

in park the engine is not loaded down, just idling at a low rpm=rough
in drive with brake on you have put some load on motor also at low rpm=rough
in drive on the road engine is at higher rpm, = smoother

generally 4 cylinder motors idle a bit rough, especially if one spark plug is not firing right or fouled or one bad spark plug wire. tune up may fix it. if it is not stumbling real bad or stalling then you can live with it.

Nov 22, 2008 | 1999 Chevrolet Cavalier

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