Question about 1993 Buick Riviera

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My 1993 riviera idles rough after new plugs and wiresis this the maf sensor going bad

Cleaned maf sensor put new plugs and wires on and it still idles rough

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You need to have the car scann the ecu and see whtat code show posible you have problem whit coil pack or sark wires or ignition module

Posted on Oct 23, 2014


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6ya staff

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Posted on Jan 02, 2017



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SOURCE: 1996 Ford Taurus Chugging MAF

You need to check for an intake leak, use a can of carb spray and spray around the top of the engine, if a leak is there the engine will change speed when you get near the leak with the spray.
Remember a sensor trouble code does not mean the part is bad, it means there is a problem with the signal from that sensor, it can be the sensor or the wiring to name a few. For instance a bad injector can give you a O2 sensor code.

Posted on Sep 09, 2008


  • 1 Answer

SOURCE: I have a 1997 Mitsubishi Galant with rough idle

I am having the same issue on Mitsubishi Galant 02. Clattering on acceleration, herky jerky idle. Pulled a code multiple cylinder misfire. My mechanic's diagnosis is bad valve cover gasket causing oil to seap into the spark plugs and bad timing belt, which I have not replaced at 150k miles. I do however know my fuel injectors do need cleaning, he hasn't ruled that out either. Have you pulled any code on it? I have read on engine knock sensor going out on some of these also. Hope this helps some.

Posted on Oct 22, 2010


  • 1 Answer

SOURCE: My 2003 Ford Escort ZX2

2003 zx2,rough idle when stoped and the car in drive,runs fine on open road,while idleing i opened the hood,when i loosened the oil fill cap i heard a pufffff,like a relief valve,it should not be building pressure should it???,please

Posted on Mar 04, 2011

Jim Morton

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SOURCE: 2001 GMC Jimmy Idling rough

I know the post is old but this is for the people who have the same problem like me and still search the web for a solution. P0300 random misfire code, rough idle after it warms up and then exhaust smells like eggs. Check the plugs 5 and 6 should have black carbon (rich fuel) plugs 1 to 4 look good. The problem was for me the Fuel Pressure Regulator. You will have to remove the air plenum to get to the fuel injector spider. Not difficult just follow a repair manual. You should notice the intake under neat will have a blackened appearance for intakes 1 to 4 and 5 and 6 will look clean. The regulator is venting the fuel and it is running down into 5 and 6 hence the fouled spark plugs. The regulator is on the back of the spider and easy to replace the biggest problem I had was getting to the fuel lines to disconnect them. Runs great now.

Posted on Nov 30, 2011


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SOURCE: 99 ford escort zx2 cleaned maf sensor, still

listen up! here is the solution I have had to replace two of them on two engines and they are always missed diagnosed by dealers because the techs these days dont understand the basics of a 4 cycle gasoline engine and they use scanners to find problems, instead of checking for fuel, spark, compression, and vaccum.
On the under side of the intake manifold (accessisble only from the underside of the car) you will find a 3/8 inch vaccum line that goes all the way around the engine to the pcv valve on the front of the engine just below the valve cover. This hose rot's right at the intake manifold nipple. this happens because of the heat coming off the exhaust manifold that is very close. So becareful when inspecting. Its avalible from Ford for aproximatly $20.00. have fun and tell the dealer to shuv it.

Posted on Dec 01, 2011

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Rough idle after initial startup.

Really the sky is the limit here. See when you first start vehicle the computer is in open loop which means it is not monitoring the O2 sensors and fuel control is set to a calibrated setting. After the Heaters heat up the O2 sensors it then goes into closed loop and starts monitoring the O2 sensors to control air/fuel. So anything in the fuel and air mix could be causing your problem like false air volume reporting from the MAF sensor,a vacuum leak,unmeasured air getting into the engine behind the MAF sensor from a leaking hose,,a faulty pcv system,lazy O2 sensors, etc.
I would first recommend cleaning the MAF sensor and resetting the keep alive memory.Get a T20 torx bit and remove the MAF and get some electrical cleaner and spray the MAF bulbs clean then let it air dry or blow it dry with light shop air. Then disconnect battery for about 30 minutes to reset the strategies and see if this cures your problem. It will take probably 50 miles of driving for the strategies to reset.

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